ST STM32G071B-DISCO User Manual

February 2019 UM2546 Rev 1 1/30

1

UM2546

User manual

STM32G071B-DISCO USB-C Discovery kit

Introduction

The STM32G071B-DISCO USB-C Discovery kit comes on top of the STM32Cube™ as a
firmware package that offers a full set of software components based on a modular
architecture allowing each module to be used separately in standalone sink applications.

The STM32G071B-DISCO USB-C Discovery kit may be executed in two different modes
depending on the position of the switch: standalone sink mode, or spy mode. The spy mode
does not use the USBPD stack. In this mode, the protocol information on the CC lines is
decoded, and no protocol action may be triggered. But in the standalone sink mode, some
protocol actions may be executed.

In both modes, the UCPD block port 1 is used, and may give an example for a customer
application.

The STM32G071B-DISCO USB-C Discovery kit has been designed to run on
STM32G071B-DISCO (MB1378).

Figure 1. STM32G071B-DISCO USB-C Discovery kit

www.st.com

Contents UM2546

2/30 UM2546 Rev 1

Contents

1 Demonstration description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.1 Demonstration package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.2 Demonstration architecture overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.2.1 Analyzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

1.2.2 HAL level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

1.2.3 Middleware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

1.3 STM32G071RB resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

1.3.1 Hardware resources used by the UCPD demonstration . . . . . . . . . . . . . 9

1.3.2 Peripherals used by the UCPD demonstration . . . . . . . . . . . . . . . . . . . 10

1.3.3 Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2 Demonstration functional description . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.1 Demo startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.1.1 Normal processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.2 UCPD demonstration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.2.1 Mode selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.2.2 LED indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3 Hardware settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.1 STM32G071B-DISCO board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

4 Software settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.1 Clock Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.2 Programming the demonstration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.2.1 Using Binary file . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.2.2 Using preconfigured projects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5 Software description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.1 Demonstration Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.2 Application overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

5.2.1 Spy mode case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

5.2.2 Standalone sink case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

5.2.3 Demonstration menu details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

5.2.4 STM32CubeMonitor USB Type-C PD tool with G0 Discovery kit . . . . . 22

UM2546 Rev 1 3/30

UM2546 Contents

3

5.2.5 Dynamic memory use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

5.3 Middlewares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

5.3.1 USB PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

5.3.2 FreeRTOS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

6 Footprint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

7 Acronyms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

8 Table of references . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

List of tables UM2546

4/30 UM2546 Rev 1

List of tables

Table 1. STM32G071RBT peripherals used by the UCPD demonstration . . . . . . . . . . . . . . . . . . . . 10

Table 2. STM32G071RBT demonstration interrupts usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Table 3. LED assignation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Table 4. Main application functions description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Table 5. Main applications functions description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Table 6. Code example: MOSFET control in spy mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Table 7. RAM/ROM consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Table 8. Table of acronyms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Table 9. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

UM2546 Rev 1 5/30

UM2546 List of figures

5

List of figures

Figure 1. STM32G071B-DISCO USB-C Discovery kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Figure 2. Demonstration folder organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 3. Discovery folder organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 4. STM32G071B-DISCO USB-C Discovery kit firmware - Software architecture . . . . . . . . . . . 7

Figure 5. STM32G071RBT hardware blocs used by the UCPD demonstration . . . . . . . . . . . . . . . . . 9

Figure 6. STM32G071RBT peripherals used by the UCPD demonstration. . . . . . . . . . . . . . . . . . . . 10

Figure 7. Mode selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 8. LED indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 9. STM32G071B-DISCO top view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 10. STM32G071B-DISCO bottom view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 11. STM32G0 software architecture overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 12. CC lines isolation/pull down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Figure 13. Menu sequence in spy mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Figure 14. Menu sequence in standalone sink mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 15. Welcome screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 16. Attach screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 17. PD capability screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 18. Power screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 19. Power role screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 20. Fast role swap screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 21. Data role screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 22. Display Port screen (only standalone mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 23. Power delivery information screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 24. Source profile screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Figure 25. Distant Sink profile screen (only standalone mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Figure 26. Action screen (only standalone mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Figure 27. Version screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Figure 28. STM32CubeMonitor USB Type-C PD tool debug trace selection. . . . . . . . . . . . . . . . . . . . 23

Figure 29. STM32G0 top and bottom view of Discovery board (MB1378). . . . . . . . . . . . . . . . . . . . . . 23

Figure 30. Trace example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Figure 31. Full STM32CubeMonitor USB Type-C PD tool example . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Demonstration description UM2546

6/30 UM2546 Rev 1

1 Demonstration description

The demonstration has been designed with the following objectives:

• Toolkit with low memory consumption

• Modular applications: independents with high level of reuse

• Basic menu navigation through joystick

• Comprehensive G0 functional coverage

1.1 Demonstration package

Figure 2 shows the demonstration folder organization:

Figure 2. Demonstration folder organization

The demonstration sources are located in the "Projects" folder of the STM32Cube package
for each supported board, here in STM32G071B-DISCO folder.

The demonstration firmware aims at demonstrating how USB-PD version PD3.0 has been
implemented in the context of STM32G0xx devices.

Figure 3 illustrates the organization of the UCPD folder.

UM2546 Rev 1 7/30

UM2546 Demonstration description

29

Figure 3. Discovery folder organization

UCPD_Analyzer sub-folders:

• Inc: Analyzer application header files

• Src: Analyzer application implementation

• Software development environments:

– EWARM: IAR embedded workbench

– MDK ARM: Keil Microcontroller Development Kit

– SW4STM32: System workbench for STM32

1.2 Demonstration architecture overview

The top level software architecture of the STM32G071B-DISCO USB-C Discovery kit
firmware is represented on Figure 4. The software elements mentioned in this diagram are
briefly depicted in dedicated sections.

Figure 4. STM32G071B-DISCO USB-C Discovery kit firmware - Software architecture

Demonstration description UM2546

8/30 UM2546 Rev 1

1.2.1 Analyzer

The UCPD Analyzer application uses only one G0 port which mainly consists in Type-C
connection/disconnection detection and Type-C power contract negotiation.

1.2.2 HAL level

HAL level layer consists in the stm32g0xx.HAL drivers together with the STM32G071B­DISCO board support package (BSP).

1.2.3 Middleware

The middleware provides the following modules:

• FreeRTOS: FreeRTOS open source solution. UCPD application is based on
FreeRTOS.

• USBPD: USB-PD software stack

UM2546 Rev 1 9/30

UM2546 Demonstration description

29

1.3 STM32G071RB resources

1.3.1 Hardware resources used by the UCPD demonstration

Figure 5. STM32G071RBT hardware blocs used by the UCPD demonstration

06Y9

0LFUR%86%

FRQQHFWRU

(PEHGGHG

67/,1.9

670

0LFURFRQWUROOHU

SLQ86(5H[WHQVLRQFRQQHFWRU

SLQ*3,2FRQQHFWRU

SLQ*3,2FRQQHFWRU

&XUUHQW

3RZHU

0RQLWRU

&XUUHQW

3RZHU

0RQLWRU

&XUUHQW

3RZHU

0RQLWRU

[2/('

'LVSOD\

-R\VWLFN

/('V

86%7\SH&

3/8*,QWHUIDFH

FDEOH

86%7\SH&
5(&(37$&/(

,QWHUIDFH

FRQQHFWRU

&& &&9%86

'&'&

FRQYHUWHU

9

6036

,&

0HFKDQLFDO

GRRUORFN

%

5HVHW

,2 ,2

567

5HVHW
,QKLELW

567

9

86%

Demonstration description UM2546

10/30 UM2546 Rev 1

1.3.2 Peripherals used by the UCPD demonstration

Figure 6. STM32G071RBT peripherals used by the UCPD demonstration

1.3.3 Interrupts

Tab le 2 shows all the external interrupts used by the demonstration

Table 1. STM32G071RBT peripherals used by the UCPD demonstration

Peripheral Usage description

SPI

LCD is controlled through SPI1. Write accesses to the LCD are performed to display
strings and bitmaps during the UCPD demonstration execution.

GPIO

The GPIO pins connected to the joystick are used to interact with the UCPD
demonstration (e.g. menu navigation).

One GPIO pin is used to detect the door position
Several GPIOs are used to drive some indication LEDs

I2C

I2C1 is used to control 3 different INA230:
– Two INA230 to detect the voltage level on both CC lines
– One INA230 to monitor the voltage and the current on VBUS

UCPD UCPD1 is used to manage the USB Type-C communication over the Type-C port.

DMA DMA is used for ADC conversions.

06Y9

670*5%7

/&'

VVG

D

'W/K

:ŽLJƐƚŝĐŬ

7\SH&3RUW

6LQN

,QD

&&

,QD

9EXV

,QD

&&

ŽŽƌ

ƉŽƐŝƚŝŽŶ

hƐĞƌ/ŶĨŽ

>ĞĚƐ

&>^,

h^Zd

hW

/Ϯ

^W/

Table 2. STM32G071RBT demonstration interrupts usage

Interrupt Usage description

Systick Delay management

EXTI line 0 Joystick SEL (interrupt mode, rising edge)

UM2546 Rev 1 11/30

UM2546 Demonstration description

29

EXTI line 2 Joystick UP (interrupt mode, rising edge)

EXTI line 3 Joystick DOWN (interrupt mode, rising edge)

EXTI line 7 Joystick RIGHT (interrupt mode, rising edge)

EXTI line 1 Joystick LEFT (interrupt mode, rising edge)

EXTI line 13 Tamper (interrupt mode, rising edge)

DMA1 Channel1 DAC/ADC conversions completion

ADC1_COMP ADC analog watchdogs

UCPD

UCPD related interrupts (e.g. Rx message received, Rx ordered set
detected, Transmit message sent, …)

Table 2. STM32G071RBT demonstration interrupts usage (continued)

Interrupt Usage description

Demonstration functional description UM2546

12/30 UM2546 Rev 1

2 Demonstration functional description

2.1 Demo startup

2.1.1 Normal processing

If the STM32G071B-DISCO is powered from the micro USB, after a board reset, at demo
startup the welcome screen is displayed.

2.2 UCPD demonstration

2.2.1 Mode selection

Depending on the position of the switch, the analyzer may run in two modes:

Figure 7. Mode selection

2.2.2 LED indications

The mode selection is confirmed by the LED LD6:

Figure 8. LED indications

UM2546 Rev 1 13/30

UM2546 Demonstration functional description

29

Table 3. LED assignation

Reference Color Name Function

LD1 Green POWER 5V 5V present onto the board

LD4 Orange SINK mode Attached to a power source

LD5 Orange SOURCE mode Attached to a device as source

LD6 Green SPY mode SPY mode active

LD7 Green CC CC1 active line

Hardware settings UM2546

14/30 UM2546 Rev 1

3 Hardware settings

On this kit, no particular setting must be configured.

The G0 Discovery kit may be powered on with a micro USB cable, or it may power itself
using the VBUS, when connected to a type C Source.

For detailed information on the hardware part, please check STM32G0 Discovery kit for
USB Type-C™ and Power Delivery user manual (UM2401)

3.1 STM32G071B-DISCO board

The STM32Cube demonstration supports STM32G071RB device and runs on
STM32G071B-DISCO board from STMicroelectronics.

Figure 9. STM32G071B-DISCO top view Figure 10. STM32G071B-DISCO bottom view

UM2546 Rev 1 15/30

UM2546 Software settings

29

4 Software settings

4.1 Clock Control

STM32G071 internal clocks are derived from the HSI running at 16Mhz.

In this demo application, the various system clocks are configured as follows:

• System clock is set to 64 MHz: the PLL is used as the system clock source.

• HCLK frequency is set to 64 MHz.

4.2 Programming the demonstration

The user may program the demonstration using two methods:

4.2.1 Using Binary file

To program demonstration's binary image into the internal Flash memory, the user may
exercise STM32G071B-DISCO_USBPD_Analyzer.hex file, thanks to ST-Link Utility or
STM32CubeProgrammer.

Please refer to the Binary Resources Demo in the Board web page STM32G071B-DISCO
(https://www.st.com/en/evaluation-tools/stm32g071b-disco.html).

4.2.2 Using preconfigured projects

Select the folder corresponding to the preferred toolchain (MDK-ARM, EWARM or
SW4STM32).

• Open USBPD_Analyzer project and rebuild all sources.

• Load the project image through the debugger.

• Restart the evaluation board (press B1: reset button).

Software description UM2546

16/30 UM2546 Rev 1

5 Software description

Figure 11. STM32G0 software architecture overview

Following sections detail:

• Application: in charge to initialize demo application, HAL, interrupt handler and launch
the main module

• Middleware: FreeRTOS, USBPD

5.1 Demonstration Application

The application goal is to prepare demonstration startup, by initializing all the HW/SW.

Table below provides a description of all the actions performed by the different functions in
main.c

Table 4. Main application functions description

Functions (Main.c) Description

Main

Initialize the HAL, configure the clock and the power
MOS, depending on the door position, initialize the
responder for the STM32CubeMonitor USB Type-C PD
tool (GUI_Init), start the stack (USBPD_DPM_InitCore),
the UCPD application (USBPD_DPM_UserInit), start the
OS (USBPD_DPM_InitOS), and then start the
demonstration

SystemClock_Config Set the right clocks for flash and RCC

UM2546 Rev 1 17/30

UM2546 Software description

29

The file "stm32g0xx_it.c" is also part of the application and is used, as usual, to map the
interrupt vector on the driver HAL driver, depending on the module requirement (for debug
trace, and joystick management)

Main demonstration functionalities are in the file demo_disco.c.

5.2 Application overview

Depending on the door position (GPIO DOOR_SENSE_PIN: PC8), two different sub­applications may be executed.

In the spy case, USBPD stack is not launched. INA230 is used to know which CC line is
selected for communication, and then decode the messages on it.

In the standalone mode, the full USBPD stack is running.

Table 5. Main applications functions description

Functions (demo_disco.c) Description

DEMO_Manage_spy

This is the main spy function. It gets the VBUS voltage
and current from the INA230, and gets the voltage level of
both CC lines. If the message queue has some messages
to process, Display_add_spymsg is called

DEMO_Manage_event Main function for standalone mode.

Display_add_spymsg

Function goal is to fill the USB PD data structures with the
information received from the CC lines. These structures
are then used by the application, to feed the G0 disco
information display.

DEMO_SPY_Handler

This function is called on any UCPD event thanks to an
interrupt. It posts the USBPD protocol message seen from
the CC lines to a queue. Later, the application reads this
queue and decode the protocol messages. We don’t
decode the message under interrupt state, to be ready as
soon as possible to see the next messages on the CC
lines.

DEMO_InitBSP

Initialise the LCD, and the voltage monitoring of VBUS
and CC lines.

Check_cc_attachement

Used in case of spy mode: to detect which CC line is used
for power delivery protocol exchanges.

DEMO_PostMMIMessage

Function that posts the joystick press event in a
FreeRTOS queue, thanks to
HAL_GPIO_EXTI_Rising_Callback function.

*_menu_nav

Function that is used to manage the joystick up and down
press to navigate into a specific menu (source power
profiles, sink power profiles, extended capabilities,
command…)

*_menu_exec

Function that executes the selected specific action (select
power profile, command…)

Intialize_RX_processing

Configures the UCPD IP (DMA, Interrupts) to be ready to
capture UCPD messages.

Software description UM2546

18/30 UM2546 Rev 1

5.2.1 Spy mode case

In spy mode, the door is open, and the Discovery kit may receive a second plug to spy the
messages exchanges.

In spy mode, the Discovery kit must not interfere with the two type C devices to which it is
connected.

This is why, as soon as open door is detected, T2, T3 and T5 MOSFETs are turned ON.

Door is open, RD56 (5K1 Ohms) is ignored (needed only for standalone mode to be seen as
a sink), and CC1 and CC2 pins are connected from the G0 UCPD IP.

Figure 12. CC lines isolation/pull down

if no micro USB is plugged, as soon as the source device detects the sink device, VBUS is
driven, and the G0 Discovery kit is powered on.

Here are the menus sequence. Details on the menus in following Section 5.2.3

Table 6. Code example: MOSFET control in spy mode

BSP_MOSFET_On(MOSFET_ENCC1);
BSP_MOSFET_On(MOSFET_ENCC2);

UM2546 Rev 1 19/30

UM2546 Software description

29

Figure 13. Menu sequence in spy mode

5.2.2 Standalone sink case

In standalone mode, the board is in captive cable configuration. Only CC1 line is used for
power delivery protocol exchanges.

In this mode, application may boot from the VBUS provided by the source. So dead battery
indication may be provided and Rd resistors on the CC1 line must be shown.

This is why when the door is closed, the T5 MOSFET is enabled and RD_CC1 signal is
driven so that the resistor R56 is set between CC1_P and GND. See details in

Figure 12.

In the standalone spy case, some specific actions may be requested using the joystick
(select the power profile…), thus menus sequence is a little bit different from the one in spy
mode configuration.

Details on the menus in following Section 5.2.3

Software description UM2546

20/30 UM2546 Rev 1

Figure 14. Menu sequence in standalone sink mode

5.2.3 Demonstration menu details

Figure 15. Welcome screen

When the G0 disco is powered on (if micro USB is plugged or VBUS driven on the type C
cable) this screen is visible.

Figure 16. Attach screen

Whenever a VBUS is present on the type C cable, this information is displayed. Then,
depending on the source capabilities seen, dual role information may be displayed.

Figure 17. PD capability screen

If USBPD protocol exchanges are seen over the CC lines, the power delivery specification
version is displayed. This information may appear in spy mode, even if one device doesn't
support power delivery

UM2546 Rev 1 21/30

UM2546 Software description

29

Figure 18. Power screen

When the source capabilities are seen over the CC lines, the maximum power profile is
displayed.

Figure 19. Power role screen

This screen will indicate if the power role swap is supported by the connected source
device.

Figure 20. Fast role swap screen

This screen will indicate if the connected source device supports fast role swap.

Figure 21. Data role screen

This screen will indicate if the connected source device supports data role swap.

Figure 22. Display Port screen (only standalone mode)

If the source is capable of using the super speed lines to send display port video signal, the
information is displayed. This screen also displays if Thunderbolt capability is available. This
information is gathered only in standalone sink mode, because the G0 issues a Discovery
identity message. In some case, the source may not respond to this message, and therefore
no information may be retrieved.

Figure 23. Power delivery information screen

Software description UM2546

22/30 UM2546 Rev 1

This screen displays the current VBUS power: voltage and current, and calculated power.

Figure 24. Source profile screen

This screen displays all source power profiles. The user scrolls the list via the joystick. In
case of standalone sink mode, he may request a dedicated power profile using the joystick
(center click on the desired profile)

Figure 25. Distant Sink profile screen (only standalone mode)

This screen displays the sink profiles. This information is retrieved only in standalone sink
mode, because a dedicated command (get sink capabilities) is sent by the G0 disco
application. No actions or selection may be triggered here on a distant sink profile.

Figure 26. Action screen (only standalone mode)

On this screen, the user may execute the displayed commands using the joystick. (center to
select). He may scroll up or down to access all possible actions.

Figure 27. Version screen

This screen displays the current G0 Discovery demonstration version.

We remind the user that the STM32CubeMonitor USB Type-C PD tool application may be
run on a PC to get more details about the USBPD protocol messages that are exchanged.
See chapter 5.2.4.

5.2.4 STM32CubeMonitor USB Type-C PD tool with G0 Discovery kit

We recommend to always plug the micro USB cable so that the disco is powered on, and
have the possibility to see the details on the USBPD protocol exchanges.

In case of spy mode, as no action may be requested using the G0 disco, only the trace is
available.

UM2546 Rev 1 23/30

UM2546 Software description

29

Figure 28. STM32CubeMonitor USB Type-C PD tool debug trace selection

Figure 29. STM32G0 top and bottom view of Discovery board (MB1378)

Software description UM2546

24/30 UM2546 Rev 1

The user gets such a screen:

Figure 30. Trace example

When the G0 disco application is used in standalone sink mode, the full
STM32CubeMonitor USB Type-C PD tool application (GUI) may be used to issue some
commands like a data role swap for example.

UM2546 Rev 1 25/30

UM2546 Software description

29

Figure 31. Full STM32CubeMonitor USB Type-C PD tool example

For more details see STM32CubeMonitor-UCPD software tool for USB Type-C™ Power
Delivery port management user manual (UM2468).

5.2.5 Dynamic memory use

The demonstration is currently using:

• CSTACK = 0x300

• HEAP = 0x800

5.3 Middlewares

5.3.1 USB PD

In this application the USBPD stack used is delivered as a library.

All information regarding this library may be found in the STM32Cube USBPD stack user
manual (UM2552).

5.3.2 FreeRTOS

FreeRTOS: FreeRTOS open source solution.

More details may be found at: https://freertos.org

Footprint UM2546

26/30 UM2546 Rev 1

6 Footprint

This chapter sums up Ram / Rom consumption per software blocks.

Here is a full demonstration of the software consumption:

Table 7. RAM/ROM consumption

Full demonstration software

Read only code

memory [Byte]

Read only data [Byte]

Read/write data

memory [Byte]

STM32CubeMonitor USB Type-C PD
tool responder (GUI)

7682 - 540

Demo Application 13596 2345 842

Policy Engine (PE) 20320 16 20

Stack Protocol layer (PRL) 3000 2 12

Cable detection (CAD) 1484 - 24

Drivers 2254 8802 324

HAL 4706 55 40

Physical 1360 - 72

Debug- Trace 280 - -

FreeRTOS 5000 1 15628

Standard Libraries 5396 78 5029

G0 Device 1948 22 65

Grand Total 67026 11321 22596

UM2546 Rev 1 27/30

UM2546 Acronyms

29

7 Acronyms

Table 8. Table of acronyms

Acronym -

CC Configuration channel

USB PD USB Power Delivery

GUI Graphical User Interface: UCPD PC monitor application

PD Power Delivery

DRP Dual Role Power

FRS Fast Role Swap

DRD Dual Role Data

VDM Vendor Defined Message

Table of references UM2546

28/30 UM2546 Rev 1

8 Table of references

References

USB-IF. (2017). Universal Serial Bus Power Delivery Specification rev 3.0. USB-IF.

UM2546 Rev 1 29/30

UM2546 Revision history

29

Revision history

Table 9. Document revision history

Date Revision Changes

20-Feb-2019 1 Initial version

UM2546

30/30 UM2546 Rev 1

IMPORTANT NOTICE – PLEASE READ CAREFULLY

STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, enhancements, modifications, and
improvements to ST products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on
ST products before placing orders. ST products are sold pursuant to ST’s terms and conditions of sale in place at the time of order
acknowledgement.

Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or
the design of Purchasers’ products.

No license, express or implied, to any intellectual property right is granted by ST herein.

Resale of ST products with provisions different from the information set forth herein shall void any warranty granted by ST for such product.

ST and the ST logo are trademarks of ST. All other product or service names are the property of their respective owners.

Information in this document supersedes and replaces information previously supplied in any prior versions of this document.

© 2019 STMicroelectronics – All rights reserved