mcu_name, board_name,port ,pin
PA0,,0,0
PA4,,0,4
PA5,TX,0,5
PA6,RX,0,6
PA7,SD_CS,0,7
PA8,LED,0,8
PB0,,1,0
PB1,,1,1
PB2,,1,2
PB3,SCL,1,3
PB4,SDA,1,4
PC0,,2,0
PC1,,2,1
PC2,SCK,2,2
PC3,MOSI,2,3
PC4,,2,4
PC5,,2,5
PC6,MISO,2,6
PC7,,2,7
PD0,,3,0
PD1,,3,1
PD2,,3,2
PD3,,3,3