STM32 F4xx Discovery Board
Setup Guide
Audio Weaver
November 2016
DSP Concepts STM32F4xx Discovery Board Users Guide
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Copyright Information
© 2014 DSP Concepts, Inc., ALL RIGHTS RESERVED. This document may not be
reproduced in any form without prior, express written consent from DSP Concepts, Inc.
Printed in the USA.
Disclaimer
DSP Concepts, Inc reserves the right to change this product without prior notice.
Information furnished by DSP Concepts is believed to be accurate and reliable. However,
no responsibility is assumed by DSP Concepts for its use; nor for any infringement of
patents or other rights of third parties which may result from its use. No license is granted
by implication or otherwise under the patent rights of DSP Concepts, Inc.
DSP Concepts STM32F4xx Discovery Board Users Guide
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Overview
This document describes how to use Audio Weaver with the STM32F401 and F407
Discovery boards. These are low cost evaluation boards for the STM32F4 series of
Cortex-M4 processors. The two boards differ slightly in the operating frequency and
amount of memory available. The instructions show how to setup the F407 board - the
higher performance processor. Setup for the F401 is almost exactly the same.
Features
Audio I/O: 2-in via USB. 2 out via DAC. @ 48 kHz
CPU clock speed 84 MHz (STM32F401)
168 MHz (STM32F407)
Tuning interface: USB HID device
Flash file system support: No
Booting from flash: Yes
Fundamental block size: 32 samples
Native data type: Floating-point
USB Power &
Programming
Audio Out
USB audio and
control
DSP Concepts STM32F4xx Discovery Board Users Guide
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Setup
The board has two USB connections:
Mini-USB – for power and programming
Micro-USB – for audio and control
Start by connecting the mini-USB connector to your PC. This will power on the board
and several LEDs will light.
Then install the ST-Link programming utility. This was included in the installer and is
located in the
<AWE>/ST_LINK Utility
folder. After installation, start the utility and the following window will appear:
From the toolbar, click on the
button to connect to the target. After a few seconds, the window will update to
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Click on the “Full Chip Erase” button to completely erase the flash contents.
Then Click on the “Program and Verify” button:
Then browse and select a binary loader file to program. Each Discovery board has a
separate .bin file:
<AWE>/Bin/STM32-keil-rel/STM32F401VC.bin
<AWE>/Bin/STM32-keil-rel/STM32F407VG.bin
You’ll then advance to the next window. Click the “Start” button to begin updating the
flash memory.
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After a few seconds, the programming operation will complete.
Next, plug in the micro-USB connection to your PC and press the black reset button. The
board will appear as two new USB devices and driver installation should happen
automatically on Windows 7 and Windows 8. That is, the board uses default Windows
drivers and no special drivers need to be installed1.
The board appears as a USB audio device. Select this under your Windows audio device
settings. On Windows 8, it appears as:
Plug in speakers to the output 3.5 mm audio jack and try playing audio from your PC.
You should hear audio being rendered by the STM32 Discovery board.
Connecting Audio Weaver to the Target
Launch Audio Weaver Designer application. Then from the Server Window (not from
the Designer window) select the menu item TargetChange Connection
1
Windows XP is currently not supported.
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In the droplist select “USB” and change the PID and VID settings if necessary as shown
below
For the STM32F407 board
For the STM32F401 board
Click on the “Change” button. This window will dismiss and the Server window will
update to reflect the connection to the Discovery board. You’ll see
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At this point the Audio Weaver Server is able to communicate with the board. To make
sure that the Audio Weaver Designer sees this change, click on the “Reconnect to Server”
button .
The default system drawn in Audio Weaver Designer is shown below.
The target has a fundamental block size of 48 samples and operates at a fixed sample rate
of 48 kHz. The left input pin indicates 2 channels of input (stereo) and this is the audio
which is streaming from the PC. The right output pin is also stereo and this is the audio
being output to the DAC. If you build and run a system but no audio is streaming from
the PC then the Server will show a CPU usage of 0%. Real-time processing will only
happen once you play audio from the PC.
Using GPIO Inputs and Outputs
The Discovery boards have a variety of leds, I/O pins, and a blue user button. Audio
Weaver has a GPIO block that allows either output to a GPIO pin or led or input from a
GPIO pin or the blue user button. However, the block has to be setup to access the
desired pin. Each pin and led on the board is labelled. The GPIO block numbers pins
starting with pin 1 and these need to be mapped to the actual pins on the board.
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STM32F407VG-Discovery Board Available GPIO Pin Map
GPIO Block
Pin Number
Board Input Pin
Name
Board Output Pin
Name
1
Blue User Button
LED6
2
PA1
LED3
3
PA2
LED5
4
PA3
PA1
5
PA8
PA2
6
PA15
PA3
7
PB0
PA8
8
PB1
PA15
9
PB4
PB0
10
PB5
PB1
11
PB7
PB4
12
PB8
PB5
13
PB11
PB7
14
PB12
PB8
15
PB13
PB11
16
PB14
PB12
17
PB15
PB13
18
PC1
PB14
19
PC2
PB15
20
PC4
PC1
21
PC5
PC2
22
PC6
PC4
23
PC8
PC5
24
PC9
PC6
25
PC11
PC8
26
PC13
PC9
27
PC14
PC11
28
PC15
PC13
29
PD0
PC14
30
PD1
PC15
31
PD2
PD0
32
PD3
PD1
33
PD6
PD2
34
PD7
PD3
35
PD8
PD6
36
PD9
PD7
37
PD10
PD8
38
PD11
PD9
39
PE2
PD10
40
PE4
PD11
41
PE5
PE2
42
PE6
PE4
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43
PE7
PE5
44
PE8
PE6
45
PE9
PE7
46
PE10
PE8
47
PE11
PE9
48
PE12
PE10
49
PE13
PE11
50
PE14
PE12
51
PE15
PE13
52
PE14
53
PE15
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