STM32F4Discovery

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Support for the STM32F4Discovery board

When using this board with RIOT, set the BOARD variable to stm32f4discovery in your Makefile. If you follow the standard RIOT project structure, your Makefile should look like this:

# name of your application
APPLICATION = hello-world

# Change this to your board if you want to build for a different board
BOARD ?= stm32f4discovery

# This has to be the absolute path to the RIOT base directory:
RIOTBASE ?= $(CURDIR)/RIOT

include $(RIOTBASE)/Makefile.include

Support for the STM32F4Discovery board

Hardware

Stm32f4discovery with RIOT pin names

MCU

MCU	STM32F407VGT6
Family	ARM Cortex-M4
Vendor	ST Microelectronics
Package	LQFP100
RAM	192 KiB (128 KiB RAM + 64 KiB CCMRAM)
Flash	1024 KiB
Frequency	up to 168 MHz
FPU	yes
Timers	14 (12× 16bit, 2× 32bit [TIM2 + TIM5])
ADCs	3× 16 channel 6 to 12-bit
UARTs	6
SPIs	3
I2Cs	3
Vcc	2.0 V - 3.6 V
MCU Datasheet	MCU Datasheet
Reference Manual	Reference Manual
Programming Manual	Programming Manual
Board Manual	Board Manual

STDIO

By default, STDIO is implemented via the native USB interface.

Using USB

Connect your computer via the micro USB connector to the board. (It is safe to connect both the native USB port of the MCU at the micro USB connector and the ST-Link programmer/debugger at the mini USB connector at the same time.)

Afterwards, simply run (with the current working directory of your terminal set to directory of the app you flashed):

make BOARD=stm32f4discovery term

Using UART

Connect your USB to UART bridge as follows:

Pin UART Adapter	Pin Board
TXD	RXD (PA3)
RXD	TXD (PA2)
GND	GND

Now flash with stdio over UART by selecting the module stdio_uart and connect to the serial. You can do both by running in a terminal (and the working directory set to the directory of the app you want to run):

USEMODULE=stdio_uart make BOARD=stm32f4discovery flash term

Note: The USEMODULE=stdio needs to be specified before the make command to pass it as environment variable.

RIOT pin mapping

Please refer to this document for the RIOTs pin mapping for the stm32f4discovery board. The pin mapping is chosen completely arbitrary and can be altered by editing the boards/stm32f4discovery/include/periph_conf.h header file.

User Interface

2 Buttons:

NAME	USER	RESET
Pin	PA0 (IN)	NRST

6 User controllable LEDs:

NAME	LD3	LD4	LD5	LD6	LD7	LD8
Color	orange	green	red	blue	green	red
Pin	PD13	PD12	PD14	PD15	PA9	PD5

LEDs LD7 and LD8 are used by the USB connector for over-current (LD8) and data (LD7) indication.

USB Device Interface

The board has a micro USB port that can be used for USB device mode. As the ST-Link on the board does not provide a USB-UART interface, the STDIO is mapped to the micro USB port by default (via CDC ACM).

Accelerometer

The STM32F4discovery board contains a 3-axis MEMS accelerometer that can sample with up to 1.6kHz.

Sensor	LIS3DSH
Type	Accelerometer
Vendor	ST Microelectronics
Datasheet	Datasheet

Pin Config

Pin / Bus	Function
SPI bus (RIOT)	`SPI_DEV(0)`
SPI bus (hardware)	SPI1
SCK	PA5 (OUT, SPI1_SCK)
MISO	PA6 (IN, SPI1_MISO)
MOSI	PA7 (OUT, SPI1_MOSI)
INT1	PE0 (IN)
INT2	PE1 (IN)
CS	PE3 (OUT)

Digital Microphone

The STM32F4discovery board contains a on-board MEMS audio sensor.

Sensor	MP45DT02
Type	Audio sensor
Vendor	ST Microelectronics
Datasheet	Datasheet

Pin Config

Pin / Interface	Function
I2S interface (hardware)	I2S2
I2S interface (RIOT)	n/a
CLK	PB10
DOUT	PC3

Audio DAC with integrated class D speaker driver

The board contains an digital analog converter (DAC) with integrated class D speaker driver.

Device	CS43L22
Type	DAC
Vendor	Cirrus Logic
Datasheet	Datasheet

Pin Config

Pin / Interface / Bus	Function
Analog (hardware)	DAC1
Analog (RIOT)	`DAC_LINE(0)`
I2S interface (hardware)	I2S3
I2S interface (RIOT)	n/a
I2C bus (hardware)	I2C1
I2C bus (RIOT)	`I2C_BUS(0)`
AIN1	PA4 (DAC1_OUT)
SCL	PB6 (I2C1_SCL)
SDA	PB9 (I2C1_SDA)
MCLK	PC7 (I2S3_MCK)
SCLK	PC10 (I2S3_CK)
SDIN	PC12 (I2S3_SD)
RESET	PD4 (OUT)

Flashing the Board

A detailed description about the flashing process can be found on the guides page. The board name for the STM32F4 Discovery is stm32f4discovery.

Emulator

To emulate this board you need an updated version of renode installed, at least version 1.11.

EMULATE=1 BOARD=stm32f4discovery make all term

Known Issues / Problems

I2C

When connecting an I2C device and a logic analyzer to an I2C port at the same time, the internal pull-up resistors are not sufficient for stable bus operation. You probably have to connect external pull-ups to both bus lines. 10K is a good value to start with.

macOS & make term

If you want the terminal to work using make term command and get a message about missing tty device install the driver from https://www.silabs.com/products/development-tools/software/usb-to-uart-bridge-vcp-drivers