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VCC GND STM32F407VET6 Mini

MicroPython board definition files for the STM32F407VET6 Mini board from VCC-GND.

board

You can buy one for around $15 AUD (Oct 2019) on AliExpress.

Build the firmware

Clone the board definitions to your MicroPython ports/stm32/boards folder.

cd micropython/ports/stm32/boards
git clone https://github.com/mcauser/VCC_GND_F407VE.git

cd ..
make BOARD=VCC_GND_F407VE

Flashing via DFU

This board can be flashed using DFU. To put the board in DFU mode, disconnect USB, slide the BOOT0 DIP switch to the ON position (towards USB) and reconnect USB.

Now you can flash the board using USB with the command:

make BOARD=VCC_GND_F407VE deploy

Once the upload is complete, disconnect USB, slide BOOT0 back to the original position and reconnect USB.

Alternatively, you can use the MicroPython command pyb.bootloader() to get into DFU mode without needing to use the switch.

Currently, you need to unplug and replug the board in order to switch from DFU mode back to regular mode.

Accessing the board

Once built and deployed, you can access the MicroPython REPL (the Python prompt) via USB serial.

screen /dev/tty.usbmodem1422 115200
# or
screen /dev/ttyACM0 115200

Specifications

STM32f407VET6 ARM Cortex M4
168MHz, 210 DMIPS / 1.25 DMIPS / MHz
1.8V - 3.6V operating voltage
25MHz system crystal (NX5032GA)
32.768KHz RTC crystal
AT24C08 I2C EEPROM 1024 Byte x 8, 400KHz
2.54mm pitch pins
JTAG/SWD header
512 KByte Flash, 192 + 4 KByte SRAM
3x SPI, 3x USART, 2x UART, 2x I2S, 3x I2C
1x FSMC, 1x SDIO, 2x CAN
1x USB 2.0 FS / HS controller (with dedicated DMA)
1x USB HS ULPI (for external USB HS PHY)
Micro SD
1x 10/100 Ethernet MAC
1x 8 to 12-bit Parallel Camera interface
3x ADC (12-bit / 16-channel)
2x DAC (12-bit)
12x general timers, 2x advanced timers
RT9193-3.3V: 3.3V LDO voltage regulator, max current 300mA
Micro USB for power and comms
User LED (PB9)
2x DIP switch for bootloader selection
Reset button
2x18 side pins + 2x10 top pins + 1x4 debug pins
Dimensions: 49.53mm x 39.37mm

Modifications

This board has a 25MHz system crystal oscillator.

change HSE_VALUE from 8000000 to 25000000
change PLL_M from 8 to 25

Exposed Port Pins

PA0-PA15
PB0-PB15
PC0-PC15
PD0-PD15
PE0-PE15

Peripherals

AT24C08 8K EEPROM (U1)

1 GND PRE
2 GND NC
3 GND E
4 GND
5 PB7 SDA
6 PB6 SCL
7 GND MODE
8 3V3 VCC

SWD debug (P4)

1 GND
2 PA14 SWCLK
3 PA13 SWDIO
4 3V3 VCC

USB (U3)

1 VCC 5V
2 PA11 USB_DM
3 PA12 USB_DP
4 GND ID
5 GND

Micro SD

1 PC10 SDIO_D2
2 PC11 SDIO_D3
3 PD2 SDIO_CMD
4 3V3
5 PC12 SDIO_SCK
6 GND
7 PC8 SDIO_D0
8 PC9 SDIO_D1
9 GND
10 PA8 SW1