# WeAct STM32F411CEU6
MicroPython board definition files for the WeAct V1.3 STM32F411CEU6 dev board.
### Build the firmware
Clone the board definitions to your [MicroPython](https://github.com/micropython/micropython) `ports/stm32/boards` folder.
```bash
cd micropython/ports/stm32/boards
git clone https://github.com/mcauser/WEACT_F411CEU6.git
cd ..
make BOARD=WEACT_F411CEU6
```
### Flashing via DFU
This board can be flashed using DFU. To put the board in DFU mode, disconnect
USB, connect `A9` to `A10` and reconnect USB. Press and hold `BOOT0`. Press
and release `RESET`. Wait 0.5 seconds. Release `BOOT0`.
List attached DFU capable devices to check you are in DFU mode.
```bash
dfu-util -l
Found DFU: [0483:df11] ver=2200, devnum=12, cfg=1, intf=0, path="20-2", alt=3, name="@Device Feature/0xFFFF0000/01*004 e", serial="328A37623437"
Found DFU: [0483:df11] ver=2200, devnum=12, cfg=1, intf=0, path="20-2", alt=2, name="@OTP Memory /0x1FFF7800/01*512 e,01*016 e", serial="328A37623437"
Found DFU: [0483:df11] ver=2200, devnum=12, cfg=1, intf=0, path="20-2", alt=1, name="@Option Bytes /0x1FFFC000/01*016 e", serial="328A37623437"
Found DFU: [0483:df11] ver=2200, devnum=12, cfg=1, intf=0, path="20-2", alt=0, name="@Internal Flash /0x08000000/04*016Kg,01*064Kg,03*128Kg", serial="328A37623437"
```
Now you can flash the board using USB with the command:
```bash
make BOARD=WEACT_F411CEU6 deploy
```
Once the upload is complete, disconnect USB, remove jumper between `A9`
and `A10`, then 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.
```bash
screen /dev/tty.usbmodem1422 115200
# or
screen /dev/ttyACM0 115200
```
### Flash
In `mpconfigboard.h` you can configure the board to use F411CE internal flash or
if you add a SPI flash chip to the bottom of the board you can use it instead.
If you use internal, there's only around 45kb free. With external you can have
4-16 MB.
```
// Use internal flash (512 KByte):
#define MICROPY_HW_ENABLE_INTERNAL_FLASH_STORAGE (1)
// Or use external SPI flash:
#define MICROPY_HW_ENABLE_INTERNAL_FLASH_STORAGE (0)
```
Tested with:
* Winbond W25Q32 (4 MByte)
* Winbond W25Q64 (8 MByte)
* Winbond W25Q128 (16 MByte)
Define the size that matches your flash chip.
```
// Winbond W25Q32 (4 MByte)
#define MICROPY_HW_SPIFLASH_SIZE_BITS (32 * 1024 * 1024)
// Or Winbond W25Q64 (8 MByte)
#define MICROPY_HW_SPIFLASH_SIZE_BITS (64 * 1024 * 1024)
// Or Winbond W25Q128 (16 MByte)
#define MICROPY_HW_SPIFLASH_SIZE_BITS (128 * 1024 * 1024)
```
If you use the wrong one, say 8 MB but you only have a 4 MB chip, it will
appear as an 8 MB volume and let you write more than 4 MB, but you absolutely
will get data corruption.
You can also use external SPI flash modules.
Most modules have WP/IO2 and HOLD/RESET/IO3 pulled high, so you can't use
Quad SPI mode, only SPI.
### Specifications
* STM32F411CEU6 ARM Cortex M4
* 100MHz, 125 DMIPS / 1.25 DMIPS / MHz
* 1.7V - 3.6V operating voltage
* 25MHz system crystal
* 32.768KHz RTC crystal
* 2.54mm pitch pins
* JTAG/SWD header
* 512 KByte Flash, 128 KByte SRAM
* 5x SPI, 3x USART, 5x I2S, 3x I2C
* 1x SDIO
* 1x USB 2.0 FS
* (Unpopulated) Winbond W25Q32 32Mbit SPI Flash
* 1x ADC (12-bit / 16-channel)
* 6x general timers, 2x advanced timers
* USB-C for power and comms
* Red power LED
* Blue user LED (PC13) active low
* 1x button for bootloader selection
* Reset button, 1x user buttons KEY (PA0)
* 2x20 side pins + 1x4 ISP pins
* no mounting holes
* Dimensions: 52.81mm x 20.78mm
### Exposed Port Pins
* PA0-PA12, PA15
* PB0-PB10, PB12-PB15
* PC13-C15
### Peripherals
#### SPI Flash (U3) Unpopulated
* 1 PA4 CS
* 2 PA6 MISO
* 3 3V3 WP
* 4 GND GND
* 5 PA7 MOSI
* 6 PA5 SCK
* 7 3V3 HOLD
* 8 3V3 VCC
#### SWD debug (P3)
* 1 GND GND
* 2 PA14 SWCLK
* 3 PA13 SWDIO
* 4 3V3 VCC
#### USB-C (J1)
* 1 GND
* 2 VBUS 5V
* 3 PA11 USB_DN
* 4 PA12 USB_DP
#### User LED
* PC13 Blue LED
### Links
* [STM32F411CE on st.com](https://www.st.com/en/microcontrollers-microprocessors/stm32f411ce.html)
* Buy on [AliExpress] or search for "STM32F411CEU6"
* Buy on [Taobao](https://item.taobao.com/item.htm?id=596986293640)
* [STM32F411 datasheet](docs/STM32F411_datasheet.pdf)
* [STM32F411 reference manual](docs/STM32F411CEU6_manual.pdf)
* [STM32F411CEU6 schematics](docs/STM32F411CEU6_schematics.pdf)
* [STM32F411CEU6 PCB](docs/STM32F411CEU6_pcb.pdf)
### Related boards
* [MCUDev Black STM32F407VET6](https://github.com/mcauser/BLACK_F407VE)
* [MCUDev Black STM32F407ZET6](https://github.com/mcauser/BLACK_F407ZE)
* [MCUDev Black STM32F407ZGT6](https://github.com/mcauser/BLACK_F407ZG)
* [MCUDev DevEBox STM32F407VET6](https://github.com/mcauser/MCUDEV_DEVEBOX_F407VET6)
* [MCUDev DevEBox STM32F407VGT6](https://github.com/mcauser/MCUDEV_DEVEBOX_F407VGT6)
* [WeAct STM32F411CEU6](https://github.com/mcauser/WEACT_F411CEU6) - this board
* [VCC GND STM32F407VET6 Mini](https://github.com/mcauser/VCC_GND_F407VE)
* [VCC GND STM32F407ZGT6 Mini](https://github.com/mcauser/VCC_GND_F407ZG)
[AliExpress]: https://www.aliexpress.com/item/4000103610226.html
## License
Licensed under the [MIT License](http://opensource.org/licenses/MIT).
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