Introduction
This application note explains how to develop an application using either Visual Basic or
C/C++ language to drive the DEMO-CR95HF-A demonstration board from a host computer.
The DEMO-CR95HF-A is a demonstration kit which allows to evaluate the performance of
STMicroelectronics CR95HF 13.56 MHz multiprotocol contactless transceiver. It includes a
ready-to-use board to interface with the CR95HF host PC demonstration software through a
USB interface.
The DEMO-CR95HF-A board is powered through the USB port and no external power
supply is required. It is made up of a CR95HF contactless transceiver, a 48 x 34 mm 13.56
MHz inductive etched antenna and its associated tuning components. The CR95HF
communicates with the STM32F103CB 32-bit core MCU via the SPI bus.
A dynamic link library (DLL) file is used by the host computer to manage several functions
and communicate with the STM32 MCU and the CR95HF IC. It is included in the
demo-cr95hf-a_dev_appli.zip version 2 (Visual Basic 6 and C/C++ source code examples)
which can be downloaded from http://www.st.com.
AN3954
Application note
Developing your own Visual Basic or C/C++ application
on a DEMO-CR95HF-A demonstration board
An executable with a simple user interface is also available for both Visual Basic and C/C++
projects.
Figure 1. DEMO-CR95HF-A evaluation board
For more information, refer to the following documents available on www.st.com:
■ CR95HF: 13.56-MHz multi-protocol contactless transceiver IC with SPI and UART serial
access datasheet
■ DEMO-CR95HF-A: Demonstration kit for the CR95HF 13.56 MHz transceiver IC data
brief
■ UM1084: CR95HF development software user guide
December 2011 Doc ID 022016 Rev 2 1/42
www.st.com
Contents AN3954
Contents
1 Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Connecting the board to your computer . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Using the DLL system file . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2.1 Overview of DLL functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Function descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Functions to check DLL installation and USB connection . . . . . . . . . . . . . 6
2.1.1 CR95HFDll_GetDLLrev . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1.2 CR95HFDLL_USBconnect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1.3 CR95HFDLL_USBhandlecheck . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.2 Functions to communicate with the STM32 MCU . . . . . . . . . . . . . . . . . . 11
2.2.1 CR95HFDll_Echo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2.2 CR95HFDLL_getMCUrev . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.2.3 CR95HFDLL_getInterfacePinState . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.3 Functions to communicate with the CR95HF IC . . . . . . . . . . . . . . . . . . . 17
2.3.1 CR95HFDll_Idn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.3.2 CR95HFDll_Select . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.3.3 CR95HFDll_STCmd . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
2.3.4 CR95HFDll_FieldOff . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
2.3.5 CR95HFDll_ResetSPI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
2.3.6 CR95HFDll_SendIRQPulse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
2.3.7 CR95HFDll_Polling_Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
2.3.8 CR95HFDll_SendNSSPulse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
2.4 Functions to communicate with a RF tag . . . . . . . . . . . . . . . . . . . . . . . . . 36
2.4.1 CR95HFDll_SendReceive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Appendix A Error codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
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1 Getting started
1.1 Connecting the board to your computer
The DEMO-CR95HF-A is connected to the host computer through its USB port. No
particular USB driver is needed. The HID USB driver (already included in all Windows
operating systems) is used for communication.
Through the USB port of your computer, you can drive the board, communicate with the
STM32 MCU, manage the CR95HF IC and send requests to a RF tag.
Figure 2. Typical application block diagram
1.2 Using the DLL system file
A DLL file (CR95HF.dll) is provided in order to drive the DEMO-CR95HF-A board from your
computer.
Copy this file to the system folder of your computer (C:/Windows/system32/).
This DLL contains several functions to enable communication with the board.
Using this DLL, the host computer is able to manage several functions and communicate
with the STM32 MCU and the CR95HF IC.
1.2.1 Overview of DLL functions
The CR95HFDll_GetDLLrev function reads the revision number of the DLL file. If the DLL
file is not correctly installed in the system folder of the host computer, this function returns
an error message (see Figure 3).
The CR95HFDLL_USBconnect function is required to connect the DEMO-CR95HF-A board
to the host computer and communicate with it. It is available from DLL revision 0.5 and
upper. The computer first checks if a DEMO-CR95HF-A is connected to the USB port. If so,
it assigns a USB handle to the board (see Figure 3).
The CR95HFDLL_USBhandlecheck function can be used to verify if the DEMO-CR95HF-A
is connected to the USB port of your computer. It is available from DLL revision 0.6 and
upper. This function sends a request to the DEMO-CR95HF-A and waits for an
acknowledge. An error code is sent if the communication with the board has been lost. In
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Getting started AN3954
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this case, the CR95HFDLL_USBconnect can be used to reconnect the DEMO-CR95HF-A
to the host computer.
Figure 3. Typical application block diagram
A set of functions are available to drive the STM32 MCU (see Figure 4):
● CR95HFDll_Echo: verifies that the DEMO-CR95HF-A board is connected to the USB
port of the computer.
● CR95HFDLL_getMCUrev: reads the firmware revision of the STM32 MCU.
● CR95HFDLL_getInterfacePinState: verifies the communication path between the
STM32 MCU and the CR95HF IC (either SPI or UART).
Figure 4. Typical application block diagram
Other functions can be used to send instructions to the CR95HF IC (see Figure 5):
● CR95HFDll_Idn: gets the IDN of the CR95HF IC.
● CR95HFDll_Select: configures the required RF protocol for the CR95HF IC (IS0
15693, ISO 14443B …) and starts the RF field on the antenna.
● CR95HFDll_STCmd: sends commands to the CR95HF IC (refer to datasheet for a list
of possible commands).
● CR95HFDll_FieldOff: stops the RF field of the CR95HF IC.
● CR95HFDll_ResetSPI: resets the SPI interface of the CR95HF IC.
● CR95HFDll_SendIRQPulse: sends an interruption pulse on the IRQ pin of the CR95HF
IC to wake it up. This interrupt function can be used when the communication between
the STM32 MCU and the DEMO-CR95HF-A is performed in SPI mode.
● CR95HFDll_SendNSSPulse: sends an interrupt pulse to the NSS pin of the CR95HF
IC to wake it up. This interrupt function can be used when the communication between
the STM32 MCU and the DEMO-CR95HF-A is performed in UART mode.
● CR95HFDll_Polling_Reading: launches a polling sequence and reads the CR95HF
answer buffer to retrieve the answer when it is not available in the FIFO answer buffer
(e.g. after an IDLE command)
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Figure 5. Typical application block diagram
Finally, the CR95HFDll_SendReceive function sends an RF frame to any tag present in the
RF field and receives its answer according to the RF protocol previously defined using the
Select command (see Figure 6).
Figure 6. Typical application block diagram
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Function descriptions AN3954
2 Function descriptions
This section describes the various functions required to evaluate the DEMO-CR95HF-A
demonstration board.
2.1 Functions to check DLL installation and USB connection
2.1.1 CR95HFDll_GetDLLrev
This function detects if the CR95HF.dll file has been installed in the system folder of the host
PC system, reads its header and sends back its revision number.
This is used by software to ensure that the DLL is correctly installed and that it is up to date.
If no DLL file is found, it returns an error message.
Visual Basic language
Declaration: Public Declare Function CR95HFDll_GetDLLrev Lib
"CR95HF.dll" (ByVal mystring As String) As Long
Prototype: Dim lngStatus As Long
Dim strAnswer As String * 256
lngStatus = CR95HFDll_GetDLLrev(strAnswer)
Input parameter:None
Output parameter: strAnswer: Revision of the DLL installed on your PC system.
Answer example: "0.4"
Returned value: lngStatus: 0
Source code example
Private Sub cmdGetDllRev_Click()
Dim strAnswer As String * 256
Dim lngStatus As Long
lngStatus = CR95HFDll_GetDLLrev(strAnswer)
If (lngStatus = 0) Then
txtDllRev.Text = strAnswer
Else
txtDllRev.Text = "Error = no Dll found"
End If
End Sub
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C/C++ language
Declaration: __declspec(dllimport) int __stdcall
CR95HFDll_GetDLLrev(char* stringreply);
Prototype: int iresult;
char strAnswer[50]="";
iresult = CR95HFDll_GetDLLrev(strAnswer);
Input parameter: None
Output parameter: strAnswer: Revision of the DLL installed on your PC system.
Answer example: "0.4"
Returned value: lresult: 0
Source code example
int Get_Dll_rev (void)
{
char strAnswer[50]="";
int iresult;
char entry3;
printf("\n\n\n\n");
iresult = CR95HFDll_GetDLLrev(strAnswer);
printf("\nGet Dll revision using CR95HFDll_GetDLLrev
function:\n");
printf("\n --> request : CR95HFDll_GetDLLrev(strAnswer)");
printf("\n <-- answer : ");
if (iresult == 0)
printf("%s = DLL version\n\n\r", strAnswer);
else
printf("%s = Error : no communication with MCU\n\n\r",
strAnswer);
printf("\n\n\n\n");
printf("\npress any key to continue");
printf("\n");
scanf("%s", &entry3);
return iresult;
}
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Function descriptions AN3954
2.1.2 CR95HFDLL_USBconnect
This function can be used to connect the DEMO-CR95HF-A to the computer USB port. The
computer then assigns an USB handle to the board.
Visual Basic language
Declaration: Public Declare Function CR95HFDLL_USBconnect
Lib"CR95HF.dll" () As Long
Prototype: Dim lngStatus As Long
lngStatus = CR95HFDLL_USBconnect()
Input parameter: None
Output parameter: None
Return value: lngStatus:
0: the DEMO-CR95HF is connected
and ready to be used
1: DEMO-CR95HF-A board not connected
Source code example
Private Sub cmdUSBconnect_Click()
Dim lngStatus As Long
lngStatus = CR95HFDLL_USBconnect()
If (lngStatus = 0) Then
txtUSBconnectAnswer.Text="DEMO-CR95HF-A connected and ready
to be used"
Else
txtUSBconnectAnswer.Text = "DEMO-CR95HF-A not connected"
End If
End Sub
C/C++ language
Declaration: __declspec(dllexport) int __stdcall
CR95HFDLL_USBconnect(void);
Prototype: int iresult;
iresult= CR95HFDLL_USBconnect ();
Input parameter: None
Output parameter: None
Return value: iresult:
0: the DEMO-CR95HF is connected and
ready to be used
1: DEMO-CR95HF-A board not connected
Source code example
int DEMO_CR95HF_A_USBconnect (void)
{
int iresult;
char entry3;
printf("\n\n\n\n");
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AN3954 Function descriptions
iresult= CR95HFDLL_USBconnect ();
printf("\nCR95HFDll_USBconnect function:\n");
printf("\n --> request : CR95HFDll_USBconnect()");
printf("\n <-- answer : ");
if (iresult == 0)
printf("DEMO-CR95HF-A is connected and ready to be used\n\n\r");
else
printf("Error : DEMO-CR95HF-A not ready to be used\n\n\r");
printf("\n\n\n\n");
printf("\npress any key to continue");
printf("\n");
scanf("%s", &entry3);
return iresult;
}
2.1.3 CR95HFDLL_USBhandlecheck
This function can be used to verify if the DEMO-CR95HF-A is correctly connected to the
USB port of the computer and if the USB Handle attribué by the CR95HFDLL_USBconnect
is always valid.
Visual Basic language
Declaration: Public Declare Function CR95HFDLL_USBhandlecheck Lib
"CR95HF.dll" () As Long
Prototype: Dim lngStatus as long
lngStatus = CR95HFDLL_USBhandlecheck()
Input parameter: None
Output parameter:None
Returned value: lngStatus:
0: the USB handle is valid
1: the USB handle is invalid and the DEMO-CR95HF-A board
not connected
Source code example
Private Sub cmdUSBhandlecheck_Click()
Dim lngStatus As Long
txtUSBhandlecheckAnswer.Text = ""
lngStatus = CR95HFDLL_USBhandlecheck()
If (lngStatus = 0) Then
txtUSBhandlecheckAnswer.Text = "DEMO-CR95HF-A connected"
ElseIf (lngStatus = 5) Then
txtUSBhandlecheckAnswer.Text = "DEMO-CR95HF-A not connected (use
CR95HFDLL_USBconnect to connect it)"
End If
End Sub
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Function descriptions AN3954
C/C++ language
Declaration: __declspec(dllexport) int __stdcall
CR95HFDLL_USBhandcheck(void);
Prototype: int iresult;
iresult= CR95HFDLL_USBhandcheck();
Input parameter: None
Output parameter: None
Return value: iresult:
0: the USB handle is valid
1: the USB handle is invalid and the DEMO-CR95HF-A board
not connected
Source code example
int DEMO_CR95HF_A_USBhandlecheck (void)
{
int iresult;
char entry3;
printf("\n\n\n\n");
iresult= CR95HFDLL_USBhandlecheck ();
printf("\nCR95HFDll_USBhandlecheck function:\n");
printf("\n --> request : CR95HFDll_USBhandlecheck()");
printf("\n <-- answer : ");
if (iresult == 0)
printf("DEMO-CR95HF-A is well connected\n\n\r");
else
printf("Error : DEMO-CR95HF-A not connected (use
CR95HFDLL_USBConnect)\n\n\r");
printf("\n\n\n\n");
printf("\npress any key to continue");
printf("\n");
scanf("%s", &entry3);
return iresult;
}
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AN3954 Function descriptions
2.2 Functions to communicate with the STM32 MCU
2.2.1 CR95HFDll_Echo
This function sends a USB request to the STM32 MCU that executes an Echo request on
the CR95HF. The STM32 MCU sends back the answer of the CR95HF, if possible, or
returns an error code ‘1’ if there is no answer.
Note: The Echo request uses the EchoCode command to perform a serial interface echo. For
more information, refer to the CR95HF transceiver datasheet.
Visual Basic language
Declaration: Public Declare Function CR95HFDll_Echo Lib "CR95HF.dll"
(ByVal mystring As String) As Long
Prototype: Dim lngStatus as long
Dim strAnswer As String * 256
lngStatus = CR95HFDll_Echo(strAnswer)
Input parameter: None
Output parameter: strAnswer: The CR95HF IC answer to the Echo request is “5500” if
there is no error.
Answer example: “5500”
Returned value: lngStatus:
0: No error
5: DEMO-CR95HF-A board not connected
Source code example
Private Sub cmdEcho_Click()
Dim strAnswer As String * 256
Dim lngStatus As Long
lngStatus = CR95HFDll_Echo(strAnswer)
If (lngStatus = 0) Then
txtEchoAnswer.Text = strAnswer
Else
txtEchoAnswer.Text = "No communication with DEMO-CR95HF-A board"
End If
End Sub
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Function descriptions AN3954
C/C++ language
Declaration: __declspec(dllimport) int __stdcall CR95HFDll_Echo(char
*Stringreply);
Prototype: int iresult;
char strAnswer[50]="";
iresult= CR95HFDll_Echo (strAnswer);
Input parameter:None
Output parameter: strAnswer: The CR95HF IC answer to the Echo request is “5500” if
there is no error.
Answer example: “5500”
Returned value:iresult:
0: No error
5: DEMO-CR95HF-A board not connected
Source code example
int Echo (void)
{
char strAnswer[50]="";
int iresult;
char entry3;
printf("\n\n\n\n");
iresult= CR95HFDll_Echo (strAnswer);
printf("\nEcho using CR95HFDll_Echo function:\n");
printf("\n --> request : CR95HFDll_Echo(strAnswer)");
printf("\n <-- answer : ");
if (iresult == 0)
printf("%s = Echo command answer\n\n\r", strAnswer);
else
printf("%s = No answer from MCU\n\n\r", strAnswer);
printf("\n\n\n\n");
printf("\npress any key to continue");
printf("\n");
scanf("%s", &entry3);
return iresult;
}
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AN3954 Function descriptions
2.2.2 CR95HFDLL_getMCUrev
This function sends a USB request to the STM32 MCU on the DEMO-CR95HF-A board that
sends back the revision number of its firmware.
Visual Basic language
Declaration: Public Declare Function CR95HFDLL_getMCUrev Lib
"CR95HF.dll" (ByVal mystring As String) As Long
Prototype: status = CR95HFDLL_getMCUrev(strAnswer)
Input parameter:None
Output parameter: strAnswer: Firmware revision of the STM32 MCU on DEMO-
CR95HF-A board.
Answer example: “0003010300”
Where:
00: Status byte (see Appendix A for error codes)
03: Size of answer (in bytes)
010300: Revision 1.3.0
Returned value: lngStatus:
0: No error
1: DEMO-CR95HF-A board not connected
Source code example
Private Sub cmdGetMCURev_Click()
Dim strAnswer As String * 256
Dim lngStatus As Long
lngStatus = CR95HFDLL_getMCUrev(strAnswer)
If (lngStatus = 0) Then
txtMCUrev.Text = strAnswer
Else
txtMCUrev.Text = "Error = no communication with STM32 MCU"
End If
End Sub
C/C++ language
Declaration: __declspec(dllexport) int __stdcall
CR95HFDLL_getMCUrev(char* stringreply);
Prototype int iresult;
char strAnswer[50]="";
iresult = CR95HFDLL_getMCUrev(strAnswer);
Input parameter:None
Output parameter: strAnswer: Firmware revision of the STM32 MCU on DEMO-
CR95HF-A board.
Answer example: “0003010300”
Where:
00: Status byte (see Appendix A for error codes)
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Function descriptions AN3954
03: Size of answer (in bytes)
010300: Revision 1.3.0
Returned value:iresult:
0: No error
1: DEMO-CR95HF-A board not connected
Source code example
int Get_MCU_rev (void)
{
char strAnswer[50]="";
int iresult;
char entry3;
printf("\n\n\n\n");
//iresult = CR95HFDLL_getMCUrev(strAnswer);
printf("\nGet MCU revision using CR95HFDLL_getMCUrev function:\n");
printf("\n --> request : CR95HFDLL_getMCUrev(strAnswer)");
printf("\n <-- answer : ");
if (iresult == 0)
printf("%s = MCU version\n\n\r", strAnswer);
else
printf("%s = Error : no communication with MCU\n\n\r",
strAnswer);
printf("\n\n\n\n");
printf("\npress any key to continue");
printf("\n");
scanf("%s", &entry3);
return iresult;
}
2.2.3 CR95HFDLL_getInterfacePinState
This function verifies the communication path between the STM32 MCU and the CR95HF
IC (either SPI or UART).
The STM32 MCU checks which communication configuration is selected on the DEMOCR95HF-A board. Two solder bridges are available to select the SPI or UART configuration.
By defeat, the board is delivered in the SPI configuration.
Visual Basic language
Declaration: Public Declare Function CR95HFDLL_getMCUrev Lib
"CR95HF.dll" (ByVal mystring As String) As Long
Prototype: status = CR95HFDLL_getMCUrev(strAnswer)
Input parameter:None
Output parameter: strAnswer: Interface Pin state.
Answer example: “00010X”
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AN3954 Function descriptions
Where:
00: Status byte (see Appendix A for error codes)
01: Size of answer (in bytes)
0X: Communication mode
With X:
0: Communication in UART mode
1: Communication in SPI Mode
Returned value: lngStatus:
0: No error
5: DEMO-CR95HF-A board not connected
Source code example
Private Sub cmdGetInterfacePinState_Click()
Dim strAnswer As String * 256
Dim lngStatus As Long
chkInterfacePinState(0).Value = vbUnchecked
chkInterfacePinState(1).Value = vbUnchecked
lngStatus = CR95HFDLL_getInterfacePinState(strAnswer)
If (lngStatus = 0) Then
txtGetInterfacePinStateAnswer.Text = strAnswer
If (Mid(strAnswer, 6, 1) = "0") Then
chkInterfacePinState(0).Value = vbChecked
chkInterfacePinState(1).Value = vbUnchecked
ElseIf (Mid(strAnswer, 6, 1) = "1") Then
chkInterfacePinState(0).Value = vbUnchecked
chkInterfacePinState(1).Value = vbChecked
Else
DoEvents
'error
End If
Else
txtGetInterfacePinStateAnswer.Text = "No answer from the DEMOCR95HF-A board"
End If
End Sub
C/C++ language
Declaration: __declspec(dllexport) int __stdcall
CR95HFDLL_getInterfacePinState(char* stringreply);
Prototypeint iresult;
char strAnswer[50]="";
iresult = CR95HFDLL_getInterfacePinState(strAnswer);
Input parameter:None
Output parameter: strAnswer: Interface Pin state.
Answer example: “00010X”
Where:
00: Status byte (see Appendix A for error codes)
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Function descriptions AN3954
01: Size of answer (in bytes)
0X: Communication mode
With X:
0: Communication in UART mode
1: Communication in SPI Mode
Returned value:iresult:
0: No error
5: DEMO-CR95HF-A board not connected
Source code example
int Get_Interface_Pin_State (void)
{
int iresult;
char strAnswer[50]="";
char entry3;
printf("\n\n\n\n");
iresult = CR95HFDLL_getInterfacePinState(strAnswer);
printf("\nGet Interface Pin State CR95HFDLL_getInterfacePinState
function:\n");
printf("\n --> request :
CR95HFDLL_getInterfacePinState(strAnswer)");
printf("\n <-- answer : ");
if (iresult == 0)
{
printf("%s = Get Interface Pin State successfully\n\n\r",
strAnswer);
if (strAnswer[5] == '0')
printf("\n %c = communication in UART
mode",strAnswer[3]);
else
printf("\n %c = communication in SPI
mode",strAnswer[3]);
}
else
printf("\n %s = No answer from DEMO-CR95HF-A\n\n\r",
strAnswer);
printf("\n\n\n\n");
printf("\npress any key to continue");
printf("\n");
scanf("%s", &entry3);
return iresult;
}
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AN3954 Function descriptions
2.3 Functions to communicate with the CR95HF IC
2.3.1 CR95HFDll_Idn
This function sends a USB request to the STM32 MCU that requests the IDN of the
CR95HF IC. The STM32 MCU send back the answer of the CR95HF containing the IDN
value (ASCII codes), if possible, or returns an error code ‘1’ if there is no answer.
Note: The IDN command requests brief information about the CR95HF and its firmware version.
For more information, refer to the CR95HF transceiver datasheet.
Visual Basic language
Declaration: Public Declare Function CR95HFDll_Idn Lib "CR95HF.dll"
(ByVal mystring As String) As Long
Prototype: Dim strAnswer As String * 256
Dim lngStatus As Long
status = CR95HFDll_Idn(strAnswer)
Input parameter:None
Output parameter: strAnswer: IDN of the CR95HF IC (if no error)
Answer example: “000F4E4643204653324A4153543000A998”
Where:
00: Status byte (see annexe 2 for error codes)
0F: Size of answer (in bytes)
4E4643204653324A4153543000: ASCII transcription
of the CR95HF IDN (in this example,
IDN = “NFC FS2JAST0©”)
A998: CRC value
Returned value: lngStatus:
0: No error
5: DEMO-CR95HF-A board not connected
Source code example
Private Sub cmdIDnRequest_Click()
Dim strAnswer As String * 256
Dim lngStatus As Long
lngStatus = CR95HFDll_Idn(strAnswer)
If (lngStatus = 0) Then
txtIdnAnswer.Text = strAnswer
Else
txtIdnAnswer.Text = "Idn not sent back by the CR95HF IC"
End If
End Sub
C/C++ language
Declaration: __declspec(dllimport) int __stdcall CR95HFDll_Idn(char
*Stringreply);
Prototype int iresult;
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Function descriptions AN3954
char strAnswer[50]="";
iresult= CR95HFDll_Idn (strAnswer);
Input parameter:None
Output parameter: strAnswer: IDN of the CR95HF IC (if no error)
Answer example: “000F4E4643204653324A4153543000A998”
Where:
00: Status byte (see annexe 2 for error codes)
0F: Size of answer (in bytes)
4E4643204653324A4153543000: ASCII transcription
of the CR95HF IDN (in this example,
IDN = “NFC FS2JAST0©”)
A998: CRC value
Returned value:iresult:
0: No error
5: DEMO-CR95HF-A board not connected
Source code example
int Idn (void)
{
int iresult;
char strAnswer[50]="";
char entry3;
printf("\n\n\n\n");
iresult= CR95HFDll_Idn (strAnswer);
printf("\nIdn using CR95HFDll_Idn function:\n");
printf("\n --> request : CR95HFDll_Idn(strAnswer)");
printf("\n <-- answer : ");
if (iresult == 0)
printf("%s = Idn command response\n\n\r", strAnswer);
else
printf("%s = Error : no Idn returned\n\n\r", strAnswer);
printf("\n\n\n\n");
printf("\npress any key to continue");
printf("\n");
scanf("%s", &entry3);
return iresult;
}
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2.3.2 CR95HFDll_Select
This function sends a USB request to the STM32 MCU that prepares the CR95HF for
communication by executing a Select request containing the selected RF parameters to the
the CR95HF IC. The STM32 MCU sends back the answer of the CR95HF, if possible, or
returns an error code ‘1’ if there is no answer. In addition to selecting the correct RF
communication parameters, this function activates the RF field. This is necessary at the
start of communications if the RF field was previously switched off.
The parameters of this function indicate the selected RF communication protocol
(ISO 15693, ISO 14443A, ISO 14443B, FELICA) as defined in the CR95HF datasheet.
Note: The Select request uses the Protocol Select command to select the RF communication
protocol and specify certain protocol-related parameters. For more information, refer to the
CR95HF transceiver datasheet.
Visual Basic language
Declaration: Public Declare Function CR95HFDll_Select Lib
"CR95HF.dll" (ByVal mycmdstring As String, ByVal
mystring As String) As Long
Prototype: Dim lngStatus As Long
Dim strConfiguration As String
Dim strSelectMsg As String * 256
lngStatus = CR95HFDll_Select(strConfiguration,
strSelectMsg)
Input parameter: strConfiguration: Selected RF communication protocol and certain
protocol-related parameters. (This configuration is used for
SendReceive requests.)
ISO15693 HighDataRate 10% One subcarrier = “010D”:
Where:
“01” is the ISO 15693 configuration
“0D” are the parameters
ISO14443A = "0200":
Where:
“02” is the ISO 14443A configuration
“00” are the parameters
ISO14443B = "0301":
Where:
“03” is the ISO 14443B configuration
“01” are the parameters
Output parameter: strSelectMsg: The DEMO-CR95HF-A sends back an answer if the
CR95HF is configured correctly and the RF field is on.
Answer example: “0000”
Where:
“00” is the status byte (see Appendix A for error codes)
“00” is the size of the answer
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Function descriptions AN3954
Returned value: lngStatus:
0: No error
5: DEMO-CR95HF-A board not connected
2: Empty argument error
3: Command parmeter error
Source code example
'Private Sub cmdSelect_ISO15693_protocol_Click()
Dim strAnswer As String * 256
Dim lngStatus As Long
lngStatus = CR95HFDll_Select("010D", strAnswer)
If (lngStatus = 0) Then
txtISO15693_SelectAnswer.Text = strAnswer
Else
txtISO15693_SelectAnswer.Text = " Select protocol ISO15693 not
executed"
End If
End Sub
Private Sub cmdSelect_ISO14443B_protocol_Click()
Dim strAnswer As String * 256
Dim lngStatus As Long
lngStatus = CR95HFDll_Select("0301", strAnswer)
If (lngStatus = 0) Then
txtISO14443B_SelectAnswer.Text = strAnswer
Else
txtISO14443B_SelectAnswer.Text = "Select protocol ISO14443B not
executed"
End If
End Sub
C/C++ language
Declaration: __declspec(dllimport) int __stdcall
CR95HFDll_Select(char *StringCmd, char *Stringreply);
Prototype: int iresult;
char strRequest[50]="";
char strAnswer[50]="";
iresult = CR95HFDll_Select(strRequest ,strAnswer);
Input parameter: strConfiguration: Selected RF communication protocol and certain
protocol-related parameters. (This configuration is used for
SendReceive requests.)
ISO15693 HighDataRate 10% One subcarrier = "010D":
Where:
“01” is the ISO 15693 configuration
“0D” are the parameters
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ISO14443A = "0200":
Where:
“02” is the ISO 14443A configuration
“00” are the parameters
ISO14443B = "0301":
Where:
“03” is the ISO 14443B configuration
“01” are the parameters
Output parameter: strSelectMsg: The DEMO-CR95HF-A sends back an answer if the
CR95HF is configured correctly and the RF field is on.
Answer example: “0000”
Where:
“00” is the status byte (see Appendix A for error codes)
“00” is the size of the answer
Returned value:iresult:
0: No error
5: DEMO-CR95HF-A board not connected
2: Empty argument error
3: Command parmeter error
Source code example
int Select_ISO15693 (void)
{
int iresult;
char strRequest[50]="";
char strAnswer[50]="";
char entry3;
printf("\n\n\n\n");
strcpy(strRequest,"010D");
iresult = CR95HFDll_Select(strRequest ,strAnswer);
printf("\nProtocol select using CR95HFDll_Select function:\n");
printf("\n --> request : CR95HFDll_Select(%s, strAnswer)",
strRequest);
printf("\n <-- answer : ");
if (iresult == 0)
printf("%s = ISO15693 protocol selected\n\n\r", strAnswer);
else
printf("%s = Select command error\n\n\r", strAnswer);
printf("\n\n\n\n");
printf("\npress any key to continue");
printf("\n");
scanf("%s", &entry3);
return iresult;
}
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Function descriptions AN3954
int Select_ISO14443B (void)
{
char strRequest[50]="";
char strAnswer[50]="";
int iresult;
char entry3;
printf("\n\n\n\n");
strcpy(strRequest,"0301");
iresult = CR95HFDll_Select(strRequest ,strAnswer);
printf("\nISO14443B protocol select using CR95HFDll_Select
function:\n");
printf("\n --> request : CR95HFDll_Select(%s,
strAnswer)",strRequest);
printf("\n <-- answer : ");
if (iresult == 0)
printf("%s = ISO14443B protocol selected\n\n\r", strAnswer);
else
printf("%s = Select command error\n\n\r", strAnswer);
printf("\n\n\n\n");
printf("\npress any key to continue");
printf("\n");
scanf("%s", &entry3);
return iresult;
}
2.3.3 CR95HFDll_STCmd
This function is used to send any request to the CR95HF IC. The STM32 MCU receives the
frame contained in the request and sends it directly to the CR95HF IC. The STM32 MCU
sends back the answer from the CR95HF IC to the PC through the USB port. The frame has
to be formatted according to the CR95HF datasheet.
This function can be defined as a “Transparent Mode” command.
The CR95HF formatted frame has to be send through this CR95HFDll_STCmd function
preceded by “01” data as the header byte.
Visual Basic language
Declaration: Public Declare Function CR95HFDll_STCmd Lib "CR95HF.dll"
(ByVal mycmdstring As String, ByVal mystring As String)
As Long
Prototype: Dim lngStatus As Long
Dim strMCUrequest As String
Dim strCR95HFanswer As String * 256
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lngStatus = CR95HFDll_STCmd(strMCUrequest,
strCR95HFanswer)
Input parameter: strMCUrequest: request to be sent by the STM32 MCU to the
CR95HF IC, preceded by “01”.
Example 1: Send RdReg (Read Wakeup Register) command to read
CR95HF wakeup flags: “010803620100”
Where:
“01” is the transparent command header byte
“0803620100” is the request to be send to the CR95HF IC
“08” is the RdReg command
“03” is the request length
“62” is the wakeup register value
“01” is the register size
“00” ST reserved
Example 2: Select ISO 15693 protocol: “010202010D”
Where:
“01” is the transparent command header byte
“0202010D” is the Protocol Select ISO 15693 frame
“02” is the Protocol Select command
“02” is the request length
“010D” are the Protocol Select command parameters
Example 3: IDLE mode:
“01070E03A200F801980001606000003F28”
Where:
“01” is the transparent command header byte
“070E03A200F801980001606000003F28” is the Idle frame
for Tag Calibration
Output parameter: strCR95HFanswer: Answer of the CR95HF IC
Example 1: Answer to RdReg command = “000102”
Where:
“00” is the status byte (see Appendix A for error codes)
“01” is the size of the answer
“02” is the register value
Example 2: Answer to Select ISO 15693 protocol = “0000”
Where:
“00” is the status byte (see Appendix A for error codes)
“00” is the size of the answer
Example 3: Answer to Idle command = “0000”
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Function descriptions AN3954
Where:
“00” is the status byte (see Appendix A for error codes)
“00” is the size of the answer
Returned value: lngStatus:
0: No error
5: DEMO-CR95HF-A board not connected
2: Empty argument error
Source code example
Private Sub cmdSTCmd_RdReg_Click()
Dim strAnswer As String * 256
Dim lngStatus As Long
lngStatus = CR95HFDll_STCmd("010803620100", strAnswer)
If (lngStatus = 0) Then
txtSTCmd_RdReg.Text = strAnswer
Else
txtSTCmd_RdReg.Text = "Read register not executed properly"
End If
End Sub
Private Sub cmdSTCmd_ISO15693_Click()
Dim strAnswer As String * 256
Dim lngStatus As Long
lngStatus = CR95HFDll_STCmd("010202010D", strAnswer)
If (lngStatus = 0) Then
txtSTCmd_ISO15693.Text = strAnswer
Else
txtSTCmd_ISO15693.Text = " ISO15693 protocol not selected"
End If
End Sub
Private Sub cmdSTCmd_Idle_Click()
Dim strAnswer As String * 256
Dim lngStatus As Long
lngStatus = CR95HFDll_STCmd("01070E03A200F801980001606000003F28",
strAnswer)
If (lngStatus = 0) Then
txtSTCmd_Idle.Text = strAnswer
Else
txtSTCmd_Idle.Text = " No Idn returned from CR95HF IC "
End If
End Sub
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C/C++ language
Declaration: __declspec(dllimport) int __stdcall
CR95HFDll_STCmd(char *StringCmd, char *StringReply);
Prototype: int iresult;
char strRequest[50]="";
char strAnswer[50]="";
iresult = CR95HFDll_STCmd(strRequest ,strAnswer);
Input parameter: strMCUrequest: Request to be sent by the STM32 MCU to the
CR95HF IC following the Datasheet.
Example 1: Send RdReg (Read Wakeup Register) command to read
CR95HF wakeup flags: “010803620100”
Where:
“01” is the transparent command header byte
“0803620100” is the request to be send to the CR95HF IC
“08” is the RdReg command
“03” is the request length
“62” is the wakeup register value
“01” is the register size
“00” ST reserved
Example 2: Select ISO 15693 protocol: “010202010D”
Where:
“01” is the transparent command header byte
“0202010D” is the Protocol Select ISO 15693 frame
“02” is the Protocol Select command
“02” is the request length
“010D” are the Protocol Select command parameters
Example 3: IDLE mode:
“01070E03A200F801980001606000003F28”
Where:
“01” is the transparent command header byte
“070E03A200F801980001606000003F28” is the Idle frame
for Tag Calibration
Output parameter: strCR95HFanswer: Answer of the CR95HF IC
Example 1: Answer to RdReg command = “000102”
Where:
“00” is the status byte (see Appendix A for error codes)
“01” is the size of the answer
“02” is the register value
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Function descriptions AN3954
Example 2: Answer to Select ISO 15693 protocol = “0000”
Where:
“00” is the status byte (see Appendix A for error codes)
“00” is the size of the answer
Example 3: Answer to Idle command = “0000”
Where:
“00” is the status byte (see Appendix A for error codes)
“00” is the size of the answer
Returned value:iresult:
0: No error
5: DEMO-CR95HF-A board not connected
2: Empty argument error
Source code example
int STCmd_RdReg (void)
{
int iresult;
char strRequest[50]="";
char strAnswer[50]="";
char entry3;
printf("\n\n\n\n");
strcpy(strRequest,"010803620100");
iresult = CR95HFDll_STCmd(strRequest ,strAnswer);
printf("\nRead register using CR95HFDll_STCmd function:\n");
printf("\n --> request : CR95HFDll_STCmd(%s,
strAnswer)",strRequest);
printf("\n <-- answer : ");
if (iresult == 0)
printf("%s = Read Register answer\n\n\r", strAnswer);
else
printf("%s = No answer from CR95HF IC\n\n\r", strAnswer);
printf("\n\n\n\n");
printf("\npress any key to continue");
printf("\n");
scanf("%s", &entry3);
return iresult;
}
int STCmd_ISO15693 (void)
{
char strRequest[50]="";
char strAnswer[50]="";
int iresult;
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char entry3;
printf("\n\n\n\n");
strcpy(strRequest,"010202010D");
iresult = CR95HFDll_STCmd(strRequest ,strAnswer);
printf("\nISO15693 protocol select using CR95HFDll_STCmd
function:\n");
printf("\n --> request : CR95HFDll_STCmd(%s,
strAnswer)",strRequest);
printf("\n <-- answer : ");
if (iresult == 0)
printf("%s = ISO15693 protocol selected successfully\n\n\r",
strAnswer);
else
printf("%s = Protocol not selected\n\n\r", strAnswer);
printf("\n\n\n\n");
printf("\npress any key to continue");
printf("\n");
scanf("%s", &entry3);
return iresult;
}
int STCmd_Idle (void)
{
char strRequest[50]="";
char strAnswer[50]="";
int iresult;
char entry3;
printf("\n\n\n\n");
strcpy(strRequest,"01070E03A200F801980001606000003F28");
iresult = CR95HFDll_STCmd(strRequest ,strAnswer);
printf("\nIdle using CR95HFDll_STCmd function:\n");
printf("\n --> request : CR95HFDll_STCmd(%s,
strAnswer)",strRequest);
printf("\n <-- answer : ");
if (iresult == 0)
else
printf("\n\n\n\n");
printf("\npress any key to continue");
printf("\n");
scanf("%s", &entry3);
return iresult;
}
printf("%s = Idle answer\n\n\r", strAnswer);
printf("%s = No answer from CR95HF IC\n\n\r", strAnswer);
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Function descriptions AN3954
2.3.4 CR95HFDll_FieldOff
This function sends a USB request to the STM32 MCU to switch off the CR95HF RF Field.
The STM32 MCU sends back the answer of the CR95HF, if possible, or returns an error
code ‘1’ if there is no answer.
Note: To perform this RF Field Off command, the STM32 MCU sends a Protocol Select command
with parameters ‘0000’. For more information, refer to the CR95HF transceiver datasheet.
Visual Basic language
Declaration: Public Declare Function CR95HFDll_FieldOff Lib
"CR95HF.dll" (ByVal mystring As String) As Long
Prototype: Dim lngStatus As Long
Dim strAnswer As String * 256
status = CR95HFDll_FieldOff(strAnswer)
Input parameter: None
Output parameter: strAnswer: The DEMO-CR95HF-A sends back an answer and the
RF Field is switched off.
Answer example: “0000”
Where:
“00” is the status byte (see Appendix A for error codes)
“00” is the size of the answer
Returned value: lngStatus:
0: No error
5: DEMO-CR95HF-A board not connected
Source code example
Private Sub cmdFieldOff_Click()
Dim strAnswer As String * 256
Dim lngStatus As Long
lngStatus = CR95HFDll_FieldOff(strAnswer)
If (lngStatus = 0) Then
txtFieldOffAnswer.Text = strAnswer
Else
txtFieldOffAnswer.Text = "Field Off request not executed"
End If
End Sub
C/C++ language
Declaration: __declspec(dllimport) int __stdcall
CR95HFDll_FieldOff(char *StringReply);
Prototype: int iresult;
char strAnswer[50]="";
iresult= CR95HFDll_FieldOff (strAnswer);
Input parameter:None
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Output parameter: strAnswer: The DEMO-CR95HF-A sends back an answer and the
RF Field is switched off.
Answer example: “0000”
Where:
“00” is the status byte (see Appendix A for error codes)
“00” is the size of the answer
Returned value:iresult:
0: No error
5: DEMO-CR95HF-A board not connected
Source code example
int FieldOff (void)
{
int iresult;
char strAnswer[50]="";
char entry3;
printf("\n\n\n\n");
iresult= CR95HFDll_FieldOff (strAnswer);
printf("\nField Off using CR95HFDll_FieldOff function:\n");
printf("\n --> request : CR95HFDll_FieldOff(strAnswer)");
printf("\n <-- answer : ");
if (iresult == 0)
printf("%s = RF Field Off ok\n\n\r", strAnswer);
else
printf("%s = Error : RF Field Off command error\n\n\r",
strAnswer);
printf("\n\n\n\n");
printf("\npress any key to continue");
printf("\n");
scanf("%s", &entry3);
return iresult;
}
2.3.5 CR95HFDll_ResetSPI
This function resets the CR95HF IC in case of a problem. This function only resets the
CR95HF IC and not the STM32 MCU.
Visual Basic language
Declaration: Public Declare Function CR95HFDll_ResetSPI Lib
"CR95HF.dll" (ByVal mystring As String) As Long
Prototype: Dim lngStatus As Long
Dim strAnswer As String * 256
lngStatus = CR95HFDll_ResetSPI(strAnswer)
Input parameter:None
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Function descriptions AN3954
Output parameter: strAnswer: The DEMO-CR95HF-A sends back an answer if the SPI
has been correctly reset.
Answer example: “0000”
Where:
“00” is the status byte (see Appendix A for error codes)
“00” is the size of the answer
Returned value: lngStatus:
0: No error
5: DEMO-CR95HF-A board not connected
Source code example
Private Sub cmdResetSPI_Click()
Dim strAnswer As String * 256
Dim lngStatus As Long
lngStatus = CR95HFDll_ResetSPI(strAnswer)
If (lngStatus = 0) Then
txtResetSPIAnswer.Text = strAnswer
Else
txtResetSPIAnswer.Text = "No answer from the DEMO-CR95HF-A board"
End If
End Sub
C/C++ language
Declaration: __declspec(dllexport) int __stdcall
CR95HFDll_ResetSPI(char* stringreply);
Prototype: int iresult;
char strAnswer[50]="";
iresult = CR95HFDll_ResetSPI(strAnswer);
Input parameter:None
Output parameter: strAnswer: The DEMO-CR95HF-A sends back an answer if the SPI
has been correctly reset.
Answer example: “0000”
Where:
“00” is the status byte (see Appendix A for error codes)
“00” is the size of the answer
Returned value:iresult:
0: No error
5: DEMO-CR95HF-A board not connected
Source code example
int ResetSPI (void)
{
int iresult;
char strAnswer[50]="";
char entry3;
printf("\n\n\n\n");
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iresult = CR95HFDll_ResetSPI(strAnswer);
printf("\nReset SPI using CR95HFDll_ResetSPI function:\n");
printf("\n --> request : CR95HFDll_ResetSPI(strAnswer)");
printf("\n <-- answer : ");
if (iresult == 0)
printf("%s = Reset SPI successfully\n\n\r", strAnswer);
else
printf("%s = No answer from DEMO-CR95HF-A\n\n\r", strAnswer);
printf("\n\n\n\n");
printf("\npress any key to continue");
printf("\n");
scanf("%s", &entry3);
return iresult;
}
2.3.6 CR95HFDll_SendIRQPulse
This function must be used when the DEMO-CR95HF-A is configured in SPI mode
(communication between the STM32 MCU and the CR95HF IC). The interrupt pulse is sent
to the CR95HF IRQ pin.
Visual Basic language
Declaration: Public Declare Function CR95HFDll_SendIRQPulse Lib
"CR95HF.dll" (ByVal mystring As String) As Long
Prototype: Dim lngStatus As Long
Dim strAnswer As String * 256
lngStatus = CR95HFDll_SendIRQPulse(strAnswer)
Input parameter:None
Output parameter: strAnswer: The DEMO-CR95HF-A sends back an answer if the IRQ
pulse was correctly sent.
Answer example: “0000”
Where:
“00” is the status byte (see Appendix A for error codes)
“00” is the size of the answer
Returned value: lngStatus:
0: No error
5: DEMO-CR95HF-A board not connected
Source code example
Private Sub cmdSendIRQPulse_Click()
Dim strAnswer As String * 256
Dim lngStatus As Long
lngStatus = CR95HFDll_SendIRQPulse(strAnswer)
If (lngStatus = 0) Then
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Function descriptions AN3954
txtSendIRQPulseAnswer.Text = strAnswer
Else
txtSendIRQPulseAnswer.Text = "No answer from the DEMO-CR95HF-A
board"
End If
End Sub
C/C++ language
Declaration: __declspec(dllexport) int __stdcall
CR95HFDll_SendIRQPulse(char* stringreply);
Prototype: int iresult;
char strAnswer[50]="";
iresult = CR95HFDll_SendIRQPulse(strAnswer);
Input parameter:None
Output parameter: strAnswer: The DEMO-CR95HF-A sends back an answer if the IRQ
Pulse was correctly sent.
Answer example: “0000”
Where:
“00” is the status byte (see Appendix A for error codes)
“00” is the size of the answer
Returned value:iresult:
0: No error
5: DEMO-CR95HF-A board not connected
Source code example
int Send_IRQ_Pulse (void)
{
int iresult;
char strAnswer[50]="";
char entry3;
printf("\n\n\n\n");
//iresult = CR95HFDll_SendIRQPulse(strAnswer);
printf("\nSend IRQ Pulse using CR95HFDll_SendIRQPulse function:\n");
printf("\n --> request : CR95HFDll_SendIRQPulse(strAnswer)");
printf("\n <-- answer : ");
if (iresult == 0)
printf("%s = Send IRQ pulse successfully\n\n\r", strAnswer);
else
printf("%s = No answer from DEMO-CR95HF-A\n\n\r", strAnswer);
printf("\n\n\n\n");
printf("\npress any key to continue");
printf("\n");
scanf("%s", &entry3);
return iresult;
}
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2.3.7 CR95HFDll_Polling_Reading
This function polls the CR95HF SPI communication wires. When the CR95HF is ready, it
sends back the data stored in its FIFO answer buffer.
This function can be used after an IDLE command to make sure that the answer buffer has
been emptied and avoid receiving an erroneous answer on the next request.
Visual Basic language
Declaration: Public Declare Function CR95HFDll_Polling_Reading Lib
"CR95HF.dll" (ByVal mystring As String) As Long
Prototype: Dim strAnswer As String * 256
Dim lngStatus As Long
lngStatus = CR95HFDll_Polling_Reading(strAnswer)
Input parameter: None
Output parameter: CR95HF answer stored in FIFO answer buffer
Return value: lngStatus:
0: No error
5: DEMO-CR95HF-A board not connected
Source code example
Private Sub cmdPollingReading_Click()
Dim strAnswer As String * 256
Dim lngStatus As Long
lngStatus = CR95HFDll_Polling_Reading(strAnswer)
If (lngStatus = 0) Then
txtPollingReadingAnswer.Text = strAnswer
Else
txtPollingReadingAnswer.Text = "No answer from the
DEMO-CR95HF-A board"
End If
End Sub
C/C++ language
Declaration: __declspec(dllexport) int __stdcall
CR95HFDll_Polling_Reading(char* StringReply);
Prototype: int iresult;
char strAnswer[50]="";
iresult = CR95HFDll_Polling_Reading(strAnswer);
Input parameter: None
Output parameter: CR95HF answer stored in FIFO answer buffer
Return value: iresult:
0: No error
5: DEMO-CR95HF-A board not connected
Source code example
int Set_Polling_Reading_config (void)
{
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Function descriptions AN3954
int iresult;
char strAnswer[50]="";
char entry3;
printf("\n\n\n\n");
iresult = CR95HFDll_Polling_Reading(strAnswer);
printf("\nSend IRQ Pulse using CR95HFDll_Polling_Readin
function:\n");
printf("\n --> request : CR95HFDll_Polling_Reading(strAnswer)");
printf("\n <-- answer : ");
if (iresult == 0)
printf("%s = Set Polling Reading successfully\n\n\r", strAnswer);
else
printf("%s = No answer from DEMO-CR95HF-A\n\n\r", strAnswer);
printf("\n\n\n\n");
printf("\npress any key to continue");
printf("\n");
scanf("%s", &entry3);
return iresult;
}
2.3.8 CR95HFDll_SendNSSPulse
This function sends an interrupt to wake up the CR95HF IC. It can be used when the
DEMO-CR95HF-A is configured in UART mode (communication between the STM32 MCU
and the CR95HF IC). The interrupt pulse is sent to the CR95HF NSS pin.
Visual Basic language
Declaration: Public Declare Function CR95HFDll_SendNSSPulse Lib
"CR95HF.dll" (ByVal mystring As String) As Long
Prototype: Dim strAnswer As String * 256
Dim lngStatus As Long
lngStatus = CR95HFDll_SendNSSPulse(strAnswer)
Input parameter: None
Output parameter: strAnswer. The DEMO-CR95HF-A sends back an answer if the
NSS pulse was correctly sent.
Example of answer: “0000”
where
“00” is the status byte (see Appendix A for error codes)
“00” is the size of the answer
Return value: lngStatus:
0: No error
5: DEMO-CR95HF-A board not connected
Source code example
Private Sub cmdSendNSSPulse_Click()
Dim strAnswer As String * 256
Dim lngStatus As Long
lngStatus = CR95HFDll_SendNSSPulse(strAnswer)
If (lngStatus = 0) Then
txtNSSpulseAnswer.Text = strAnswer
Else
txtNSSpulseAnswer.Text = "No answer from the DEMO-CR95HF-A board"
End If
End Sub
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C/C++ language
Declaration: __declspec(dllexport) int __stdcall
CR95HFDll_SendNSSPulse(char* StringReply);
Prototype: int iresult;
char strAnswer[50]="";
iresult = CR95HFDll_SendNSSPulse(strAnswer);
Input parameter: None
Output parameter: strAnswer: The DEMO-CR95HF-Asends back an answer
if the NSS pulse was correctly sent.
Example of answer: “0000”
where
“00” is the status byte (see Appendix A for error codes)
“00” is the size of the answer
Return value: iresult:
0: No error
5: DEMO-CR95HF-A board not connected
Source code example
int Send_NSS_Pulse (void)
{
int iresult;
char strAnswer[50]="";
char entry3;
printf("\n\n\n\n");
iresult = CR95HFDll_SendNSSPulse(strAnswer);
printf("\nSend IRQ Pulse using CR95HFDll_SendNSSPulse function:\n");
printf("\n --> request : CR95HFDll_SendNSSPulse(strAnswer)");
printf("\n <-- answer : ");
if (iresult == 0)
printf("%s = Send NSS pulse successfully\n\n\r", strAnswer);
else
printf("%s = No answer from DEMO-CR95HF-A\n\n\r", strAnswer);
printf("\n\n\n\n");
printf("\npress any key to continue");
printf("\n");
scanf("%s", &entry3);
return iresult;
}
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Function descriptions AN3954
2.4 Functions to communicate with a RF tag
2.4.1 CR95HFDll_SendReceive
This function sends a USB request to the STM32 MCU that executes a SendRecv command
with data to the CR95HF IC. The STM32 MCU sends back the answer of the CR95HF, if
possible, or returns an error code ‘1’ if there is no answer.
Note: The request uses the SendRecv command to send data using previously selected protocol
and to receive the tag response. For more information, refer to the CR95HF transceiver
datasheet.
Visual Basic language
Declaration: Public Declare Function CR95HFDll_SendReceive Lib
"CR95HF.dll" (ByVal mycmdstring As String, ByVal
mystring As String) As Long
Prototype: Dim lngStatus As Long
Dim strCR95HFrequest As String
Dim strTagResponse As String * 256
lngStatus = CR95HFDll_SendReceive(strCR95HFrequest,
strTagResponse )
Input parameter: strCR95HFrequest: The RF Request to be sent by the CR95HF IC to
the Tag (with previously selected ISO format).
ISO 15693 Inventory example: “260100”
Where:
“260100” is the ISO 15693 Inventory command.
ISO 14443B Initiate example: "0600"
Where:
“0600” is the ISO 14443B Initiate command.
Output parameter: strTagResponse: The Tag answer if the CR95HF has received an
answer from the Tag in the field; otherwise, an error code (see
Appendix A).
ISO 15693 Inventory example:
“800D00FF5AB914F6414C02E0385D00”
Where:
“80” is the status byte (see Appendix A for error codes)
“0D” is the length of entire data field
“00FF5AB914F6414C02E0” data received from the tag
“385D” is the original received CRC value
“00” is the protocol error status
ISO 14443B Initiate example: “80046C125900”
Where:
“80” is the status byte (see annexe 2 for error codes)
“04” is the length of entire data field
“6C” is the data received from the tag
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“1259” is the original received CRC value
“00” is the protocol error status
Returned value: lngStatus:
0: No error
5: DEMO-CR95HF-A board not connected
4: Communication error
Source code example
Private Sub cmdSendReceive_ISO15693_Inventory_Click()
Dim strTagResponse As String * 256
Dim lngStatus As Long
lngStatus = CR95HFDll_SendReceive("260100", strTagResponse)
If (lngStatus = 0) Then
txtISO15693_Inventory_Answer.Text = strTagResponse
Else
txtISO15693_Inventory_Answer.Text = "No answer from the Tag"
End If
End Sub
Private Sub cmdSendReceive_ISO14443B_Initiate_Click()
Dim strTagResponse As String * 256
Dim lngStatus As Long
lngStatus = CR95HFDll_SendReceive("0600", strTagResponse)
If (lngStatus = 0) Then
txtISO14443B_Initiate_Answer.Text = strTagResponse
Else
txtISO14443B_Initiate_Answer.Text = "No answer from the Tag"
End If
End Sub
C/C++ language
Declaration: __declspec(dllimport) int __stdcall
CR95HFDll_SendReceive(char *StringCmd, char
*StringReply);
Prototype: int iresult;
char strRequest[50]="";
char strTagAnswer[50]="";
iresult=CR95HFDll_SendReceive(strRequest,strTagAnswer);
Input parameter: strCR95HFrequest: The RF Request to be sent by the CR95HF IC to
the Tag (with previously selected ISO format).
ISO 15693 Inventory example: “260100”
Where:
“260100” is the ISO 15693 Inventory command.
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Function descriptions AN3954
ISO 14443B Initiate example: "0600"
Where:
“0600” is the ISO 14443B Initiate command.
Output parameter: strTagResponse: The Tag answer if the CR95HF has received an
answer from the Tag in the field; otherwise, an error code (see
Appendix A).
ISO 15693 Inventory example:
“800D00FF5AB914F6414C02E0385D00”
Where:
“80” is the status byte (see Appendix A for error codes)
“0D” is the length of entire data field
“00FF5AB914F6414C02E0” data received from the tag
“385D” is the original received CRC value
“00” is the protocol error status
ISO 14443B Initiate example: “80046C125900”
Where:
“80” is the status byte (see annexe 2 for error codes)
“04” is the length of entire data field
“6C” is the data received from the tag
“1259” is the original received CRC value
“00” is the protocol error status
Returned value:iresult:
0: No error
5: DEMO-CR95HF-A board not connected
4: Communication error
Source code example
int Send_ISO15693_Inventory (void)
{
int iresult;
char strRequest[50]="";
char strTagAnswer[50]="";
char entry3;
printf("\n\n\n\n");
strcpy(strRequest,"260100");
iresult=CR95HFDll_SendReceive(strRequest,strTagAnswer);
printf("\nISO15695 inventory using CR95HFDll_SendReceive
function:\n");
printf("\n --> request : CR95HFDll_SendReceive(%s,
strTagAnswer)",strRequest);
printf("\n <-- answer : ");
if ((strTagAnswer[0] == '8') & (strTagAnswer[1] == '0')) //CR95HF Tag
answer OK
{
printf("%s = Tag answer",strTagAnswer);
}
else
{
printf("%s = No tag answer received\n");
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}
printf("\n\n\n\n");
printf("\npress any key to continue");
printf("\n");
scanf("%s", &entry3);
return iresult;
}
int Send_ISO14443B_Initiate (void)
{
char strRequest[50]="";
char strTagAnswer[50]="";
int iresult;
char entry3;
printf("\n\n\n\n");
strcpy(strRequest,"0600");
iresult=CR95HFDll_SendReceive(strRequest,strTagAnswer);
printf("\nISO14443B Initiate using CR95HFDll_SendReceive
function:\n");
printf("\n --> request : CR95HFDll_SendReceive(%s,
strTagAnswer)",strRequest);
printf("\n <-- answer : ");
if ((strTagAnswer[0] == '8') & (strTagAnswer[1] == '0')) //CR95HF Tag
answer OK
{
printf("%s = Tag answer",strTagAnswer);
}
else
{
printf("No tag answer received\n");
printf("CR95HF answer : %s",strTagAnswer);
}
printf("\n\n\n\n");
printf("\npress any key to continue");
printf("\n");
scanf("%s", &entry3);
return iresult;
}
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Error codes AN3954
Appendix A Error codes
Table 1. List of error codes
Error code Description
0000 Answer OK
8000 Answer OK
8200 Invalid command length
8300 Invalid protocol
8600 Communication error
8700 Frame wait time out OR no tag
8800 Invalid Start Of Frame
8900 Receive buffer overflow (too many bytes received)
8A00 Framing error (start bit = 0, stop bit = 1)
8B00 EGT time out (for ISOIEC 14443-B)
8C00 Invalid length. Used in Felica, when field length < 3
8D00 CRC error (Used in Felica protocol)
8E00 Reception lost without EOF received
FD00 Time out - no answer from Tag detected by the CR95HF IC
FE00 Unknown error
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AN3954 Revision history
Revision history
Table 2. Document revision history
Date Revision Changes
25-Jul-2011 1 Initial release.
Added functions available in new DLL release revision 0.5:
Section 2.1.2: CR95HFDLL_USBconnect, Section 2.1.3:
CR95HFDLL_USBhandlecheck, Section 2.3.7:
CR95HFDll_Polling_Reading, and Section 2.3.8:
CR95HFDll_SendNSSPulse.
Updated returned value in C/C++ for Section 2.1.1:
CR95HFDll_GetDLLrev, Section 2.2.2: CR95HFDLL_getMCUrev,
16-Dec-2011 2
Section 2.2.3: CR95HFDLL_getInterfacePinState, Section 2.3.1:
CR95HFDll_Idn, Section 2.3.2: CR95HFDll_Select, Section 2.3.3:
CR95HFDll_STCmd, Section 2.3.4: CR95HFDll_FieldOff,
Section 2.3.5: CR95HFDll_ResetSPI, Section 2.3.6:
CR95HFDll_SendIRQPulse, Section 2.4.1:
CR95HFDll_SendReceive.
Updated returned value in Visual basic and C/C++ for Section 2.2.1:
CR95HFDll_Echo.
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AN3954
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