Support for STM32F1xx
There are STM32F103 based boards available at very affordable price-point, commonly referred to as the Bluepill as in the Matrix. The pin maps is available via STM32Duino.
SPI Mode
Using 1st bank of pins for SPI mode according to diagram here. SPI pins are in the table below |Pin function| Pin Number| |------------|-----------| |MOSI | PA7 | |MISO | PA6 | |SCK | PA5 | |CS | PA4 |
UART Mode
NOTE - Pin functions are reversed on the ATM90E26 Side
Software Serial - TBD
Pin function (STM32) | Pin Number |
---|---|
RX | 10 |
TX | 11 |
Hardware Serial - Tested Working
Pin function (STM32) | Pin Number |
---|---|
RX | PB11 |
TX | PB10 |