Pins.md
Pins

This document describes the different functions of each pin on the STM32 MCU. The highlighted functions are the recommended function to use for the pin, though not all of the recommendations must be followed. Some recommendations, however (such as those required for SWD programming/debugging) must be followed. See the datasheet for more details.

The MbedOS pin names are defined in the ]]>github repo]]>.

Sorted by Pin Name




  
STM Pin Name
  
MbedOS Pin Name(s)
  
Custom Pin Name(s)
  
Function(s)
  
Usage




  
PA0
  
PA_0/A0
  
PTA0
  
USART2_CTS, ADC12_IN1
  
Aux Voltage


  
PA1
  
PA_1/A1
  
PTA1
  
USART2_RTS_DE, ADC12_IN2
  
DC-DC Voltage


  
PA2
  
PA_2
  
PTA2
  
USART2_TX, ADC1_IN3
  
Fan Current


  
PA3
  
PA_3
  
PTD2
  
USART2_RX, SPI1_CLK, ADC1_IN4
  
CAN Error LED


  
PA4
  
PA_4/A2
  
PTD1
  
SPI1_NSS, SPI3_NSS, USART2_CK, ADC2_IN17, DAC1_OUT1
  
BMS Error LED


  
PA5
  
PA_5/D13
  
LTD3
  
SPI1_SCK, ADC2_IN13, DAC1_OUT2
  
Horn


  
PA6
  
PA_6/D12
  
LTA2
  
SPI1_MISO, ADC2_IN3, DAC2_OUT1
  
BMS Strobe Current


  
PA7
  
PA_7/D11
  
LTD2
  
SPI1_MOSI, ADC2_IN4
  
BMS Strobe


  
PA8
  
PA_8/D7
  

  
I2C3_SCL, I2C2_SDA, USART1_CK, FDCAN3_RX, ADC5_IN1
  
BMS_CAN2_RX


  
PA9
  
PA_9/D8
  
LTD5
  
I2C3_SMBA, I2C2_SCL, USART1_TX, ADC5_IN2
  
Left Turn Signals


  
PA10
  
PA_10/D2
  

  
I2C2_SMBA, SPI2_MISO, USART1_RX
  
BMS_CAN1_STBY


  
PA11
  
PA_11
  

  
SPI2_MOSI, USART1_CTS, FDCAN1_RX
  
BMS_CAN1_RX


  
PA12
  
PA_12
  

  
USART1_RTS_DE, FDCAN1_TX
  
BMS_CAN1_TX


  
PA13
  
PA_13
  

  
SWDIO
  
SWDIO


  
PA14
  
PA_14
  

  
SWCLK
  
SWCLK


  
PA15
  
PA_15
  

  
JTDI, I2C1_SCL, SPI1_NSS, SPI3_NSS, USART2_RX, UART4_RTS_DE, FDCAN3_TX
  
JTDI (not used)


  
PB0
  
PB_0/A3
  
LTA4
  
ADC3_IN12,ADC1_IN15
  
Brake Lights Current


  
PB1
  
PB_1
  
LTD0
  
ADC3_IN1, ADC1_IN12
  
Brake Lights


  
PB2
  
PB_2
  
LTA1
  
I2C3_SMBA, ADC2_IN12
  
Right Turn Signals Current


  
PB3
  
PB_3/D3
  

  
SWO, SPI1_SCK, SPI3_SCK, USART2_TX, FDCAN3_RX
  
SWO


  
PB4
  
PB_4/D5
  

  
SPI1_MISO, SPI3_MISO, USART2_RX, UART5_RTS_DE, FDCAN3_TX
  
BMS_CAN2_TX


  
PB5
  
PB_5/D4
  

  
I2C1_SMBA, SPI1_MOSI, SPI3_MOSI, USART2_CK, I2C3_SDA, FDCAN2_RX, UART5_CTS
  
BMS_CAN2_STBY


  
PB6
  
PB_6/D10
  

  
USART1_TX, FDCAN2_TX
  
USB_TX


  
PB7
  
PB_7
  

  
I2C4_SDA, I2C1_SDA, USART1_RX, USART4_CTS
  
USB_RX


  
PB8
  
PB_8/D15
  

  
I2C1_SCL, USART3_TX, FDCAN1_RX, BOOT0
  
BOOT0


  
PB9
  
PB_9/D14
  

  
I2C1_SDA, USART3_TX, FDCAN1_TX, I2C2_SDA, UART5_TX
  
MAIN_CAN_STBY


  
PB10
  
PB_10/D6
  
LTD1
  
USART3_TX, SPI1_SCK
  
Right Turn Signals


  
PB11
  
PB_11
  
LTA0
  
USART3_RX, ADC12_IN14
  
DRLs (Daytime Running Lights) Current


  
PB12
  
PB_12
  

  
I2C2_SMBA, SPI2_NSS, USART3_CK, FDCAN2_RX, ADC4_IN3, ADC1_IN11
  
MAIN_CAN_RX


  
PB13
  
PB_13
  

  
SPI2_SCK, USART3_CTS, FDCAN2_TX, ADC3_IN5
  
MAIN_CAN_TX


  
PB14
  
PB_14
  
LTD4
  
SPI2_MISO, USART3_RTS_DE, ADC4_IN4, ADC1_IN5
  
DRLs (Daytime Running Lights)


  
PB15
  
PB_15
  
LTA3
  
SPI2_MOSI, ADC4_IN5, ADC2_IN15
  
Left Turn Signals Current


  
PC13
  
PC_13
  
PTD0
  

  
DC-DC ON


  
PC14
  
PC_14
  

  
OSC32_IN
  
OSC32_IN


  
PC15
  
PC_15
  

  
OSC32_OUT
  
OSC32_OUT (not used)


  
PF0
  
PF_0
  

  
OSC_IN
  
OSC_IN


  
PF1
  
PF_1
  

  
OSC_OUT
  
OSC_OUT (not used)


  
PG10
  
PG_10
  

  
NRST
  
NRST




Note: the LED for DC-DC ON being used can be directly connected to the power supply driving it.