#stm32f401ccu6

[objectivesea]

STM32F401CCU6 Blackpill DFU recovery

If you should happen to "brick" your blackpill dev board in such a way that it doesn't respond to your STLINK v2 debugger anymore, you can recover it by flashing a known-good program via USB Device Firmware Update (DFU) mode.

Every stm32f4 has a built-in DFU bootloader in ROM. To boot into DFU mode, connect the board to your computer via USB (directly, do not use an st-link debugger) hold down the BOOT0 button, and then briefly press the NRST button.

Once in DFU mode, we can flash a known-good program onto it to reset it to a usable-state. I used https://github.com/a5021/STM32F401CCU6-Blink-Bare-Metal/ (`cd ide; make`).

Before we can flash that program, we need to convert the ELF executable into a stm32 proprietary DfuSe format. To do that, I used:

https://github.com/majbthrd/elf2dfuse

cd elf2dfuse

make

./elf2dfuse ../STM32F401CCU6-Blink-Bare-Metal/ide/build/STM32F401CCU6-Blink-Bare-Metal.elf ./out.hex

Now that we have out.hex a DfuSe format binary known-good program for our microcontroller, we just need to flash it over to the board. To flash it, I used dfu-util (`brew install dfu-util`):

dfu-util -a "@Internal Flash /0x08000000/04*016Kg,01*064Kg,01*128Kg" -D ./out.hex

To figure out the exact "@Internal Flash" string to use for that command, run `dfu-util --list` to list the possible dfu targets. They vary slightly between boards (one board I have ended in 03*128Kg, the other 01*128Kg).

That's it. Tap the NRST button to reboot out of DFU mode, and you should see a quick repeating pattern of blinks as the Blink-Bare-Metal program runs.

[texelec]

Christmas SID

The Christmas SID is based on the STM32 SID Player by Bashika.  We became aware of this project several months back and really wanted to use it for something.  We have also long wanted to make a Christmas ornament, so we put the two together and came up with the Christmas SID! Features: -STM32F401CCU6 ARM CPU @ 84MHz – 60.9K Free to load SID files -7 Dual Color LEDs with 3 different fire modes…

[mangowall]

>>>Manual: Click here to open<<<   Why Choose 401?   In the F401 series, the chip is the cheapest, even cheaper than some F1, and crushed F1 on the main frequency, and has a floating-point ...