README.md

Blue Pill STM32F103C8T6

⚠️ Work in progress. Depends on STM32F1 support in MicroPython.

MicroPython board definition files for the generic blue pill STM32F103C8T6 dev board.

Brand: vcc-gnd/Generic

Markings: http://vcc-gnd.taobao.com/

You can buy one for around $2 USD on AliExpress

Build and deploy the firmware:

⚠️ Most likely does not work yet.

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

cd micropython/ports/stm32/boards
git clone https://github.com/mcauser/BLUE_PILL_F103C8.git

• Disconnect the board from USB
• Set BOOT0 jumper to ON (BT0->3V3)
• Connect the board via USB

cd micropython/ports/stm32
make BOARD=BLUE_PILL_F103C8
make BOARD=BLUE_PILL_F103C8 deploy

• Disconnect the board from USB
• Set BOOT0 jumper to OFF (BT0->GND)
• Connect the board via USB

screen /dev/tty.usbmodem1422

Specifications:

• STM32F103C8T6 ARM Cortex M3
• 72MHz, 90 DMIPS / 1.25 DMIPS / MHz
• 2.0V - 3.6V operating voltage
• 8MHz system crystal
• 32.768KHz RTC crystal
• 2.54mm pitch pins
• JTAG/SWD header
• 64 KByte Flash, 20 KByte SRAM
• 2x SPI, 3x USART, 2x I2C, 1x CAN
• 38 I/Os almost all 5V-tolerant
• 1x USB 2.0 FS
• 2x ADC (12-bit / 16-channel)
• 3x general timers, 1x advanced timer
• RT9193 3.3V LDO voltage regulator, max current 300mA
• Micro USB for power and data
• Blue user LED (PC13)
• 2x jumpers for bootloader selection
• Reset button
• 2x20 side pins + 1x4 SWD pins
• Dimensions: 53.0mm x 22.5mm

Experimental:

Some C8 microcontrollers have been discovered to have 128 KB flash instead of 64 KB. To fit MicroPython on this board, we'll try to use 128KB flash and pretend it's a F103CB board instead of F103C8. CB=128K, C8=64K.

Some C8 boards ship with incorrect USB pull up resistors. More on that later.

Links:

• STM32F103C8 on st.com
• Blue Pill on stm32duino wiki
• VCC GND branded STM32F103C8T6 Blue Pill
• Buy on AliExpress or search for "STM32F103C8T6"

License

Licensed under the MIT License.