6 years, 4 months ago.

Using multiple serial ports on NUCLEO_L152RE

I am trying to find out the pin definitions that can be use for multiple serial ports on the NUCLEO_L152RE. I got the first one is connected to ST-LINK so cannot be used directly without having to change solder jumpers on board. I got the second UART working fine using PA_9, PA_10 which I found on a previous question that was posted. However I need two ports that I can use directly. So I need the pins that can be used for the third Serial connection. I don't know if I simple need the pin names or is there some configuration that needs to be done to use the third Serial port. Thanks in advance for any help.

1 Answer

6 years, 4 months ago.

Here is the complete list of currently defined pin options:

static const PinMap PinMap_UART_TX[] = {
    {PA_2,  UART_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_USART2)},
    {PA_9,  UART_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_USART1)},
    {PB_6,  UART_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_USART1)},
    {PB_10, UART_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_USART3)},
//  {PC_10, UART_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_USART3)},
    {PC_10, UART_4, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_UART4)},
    {PC_12, UART_5, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_UART5)},
    {NC,    NC,     0}
};


static const PinMap PinMap_UART_RX[] = {
    {PA_3,  UART_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_USART2)},
    {PA_10, UART_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_USART1)},
    {PB_7,  UART_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_USART1)},
    {PB_11, UART_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_USART3)},
//  {PC_11, UART_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_USART3)},
    {PC_11, UART_4, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_UART4)},
    {PD_2,  UART_5, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_UART5)},
    {NC,    NC,     0}
};

Accepted Answer