STM32L0 Uart传输

Question

我正尝试使用st-link将NUCLEO-L053R8的数据通过针脚PA2和PA3发送到我的PC COM端口。我有一个示例代码，但对我不起作用。当我只想通过UART将数据发送到我的PC时，哪种方法是最受欢迎的？中断还是DMA？这是我的代码。

#include <stm32l0xx_hal.h>
#include <stm32_hal_legacy.h>

#ifdef __cplusplus
extern "C"
#endif

void SysTick_Handler(void)
{
    HAL_IncTick();
    HAL_SYSTICK_IRQHandler();
}

static UART_HandleTypeDef USART2_UARTHandle = UART_HandleTypeDef();

int main(void)
{
    HAL_Init();

__USART2_CLK_ENABLE();
__GPIOA_CLK_ENABLE();

GPIO_InitTypeDef GPIO_InitStructure;

// PA2 & PA3 als USART Configurieren
GPIO_InitStructure.Pin = GPIO_PIN_2;
GPIO_InitStructure.Mode = GPIO_MODE_AF_PP;
GPIO_InitStructure.Pull = GPIO_NOPULL;
GPIO_InitStructure.Speed = GPIO_SPEED_HIGH; 
GPIO_InitStructure.Alternate = GPIO_AF0_USART2;
HAL_GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_InitStructure.Pin = GPIO_PIN_3;
GPIO_InitStructure.Mode = GPIO_MODE_AF_OD;
HAL_GPIO_Init(GPIOA, &GPIO_InitStructure);

USART2_UARTHandle.Instance          = USART2;
USART2_UARTHandle.Init.BaudRate     = 9600;
USART2_UARTHandle.Init.WordLength   = UART_WORDLENGTH_8B;
USART2_UARTHandle.Init.StopBits     = UART_STOPBITS_1;
USART2_UARTHandle.Init.Parity       = UART_PARITY_NONE;
USART2_UARTHandle.Init.HwFlowCtl    = UART_HWCONTROL_NONE;
USART2_UARTHandle.Init.Mode         = UART_MODE_TX_RX;

if (HAL_UART_Init(&USART2_UARTHandle) != HAL_OK)        // Check if USART2 init funktioniert
{
    asm("bkpt 255");                                    // Enter Processor Debug State
}



for (; ;)
{

    uint8_t buffer[4];

    HAL_UART_Transmit(&USART2_UARTHandle, buffer, sizeof(buffer), HAL_MAX_DELAY);   
    HAL_UART_Receive(&USART2_UARTHandle, buffer, sizeof(buffer), HAL_MAX_DELAY);


    //HAL_UART_Receive(&USART2_UARTHandle, buffer, sizeof(buffer), HAL_MAX_DELAY);
    //      HAL_GPIO_WritePin(GPIOC, GPIO_PIN_12, GPIO_PIN_SET);
    //      HAL_Delay(500);
    //      HAL_GPIO_WritePin(GPIOC, GPIO_PIN_12, GPIO_PIN_RESET);
    //      HAL_Delay(500);

}
}

我很高兴能得到提示！