时钟配置HSI主频配置64M

配置好串口，选择异步模式

配置DMA TX,RX,选择循环模式。

NVIC中勾选使能中断

勾选生成独立的.c和h文件

配置好需要的开发环境并获取代码

 串口重定向勾选Use Micro LIB

 main.c文件修改

增加头文件和串口重定向

#include <string.h>int fputc(int ch, FILE *f)
{HAL_UART_Transmit(&huart1, (uint8_t *)&ch, 1, 0xFFFF);return ch;
}

main函数修改

  printf("hello world\r\n");while (1){if(USART1_RECV_FLAG == 1){printf("rx_len = %d \r\n",USART1_RX_LEN);HAL_UART_Transmit(&huart1,USART1_RX_BUF, USART1_RX_LEN,200);memset(USART1_RX_BUF,0,USART1_RX_BUF_SIZE);USART1_RX_LEN = 0;USART1_RECV_FLAG = 0;}HAL_UART_Receive_DMA(&huart1,USART1_RX_BUF,USART1_RX_BUF_SIZE);/* USER CODE END WHILE *//* USER CODE BEGIN 3 */}

usart.c文件修改

增加定义

uint8_t USART1_RX_LEN = 0;             
uint8_t USART1_RECV_FLAG = 0;     
uint8_t USART1_RX_BUF[USART1_RX_BUF_SIZE]={0};   

修改void MX_USART1_UART_Init(void)函数

void MX_USART1_UART_Init(void)
{/* USER CODE BEGIN USART1_Init 0 *//* USER CODE END USART1_Init 0 *//* USER CODE BEGIN USART1_Init 1 *//* USER CODE END USART1_Init 1 */huart1.Instance = USART1;huart1.Init.BaudRate = 115200;huart1.Init.WordLength = UART_WORDLENGTH_8B;huart1.Init.StopBits = UART_STOPBITS_1;huart1.Init.Parity = UART_PARITY_NONE;huart1.Init.Mode = UART_MODE_TX_RX;huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;huart1.Init.OverSampling = UART_OVERSAMPLING_16;huart1.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;huart1.Init.ClockPrescaler = UART_PRESCALER_DIV1;huart1.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;if (HAL_UART_Init(&huart1) != HAL_OK){Error_Handler();}if (HAL_UARTEx_SetTxFifoThreshold(&huart1, UART_TXFIFO_THRESHOLD_1_8) != HAL_OK){Error_Handler();}if (HAL_UARTEx_SetRxFifoThreshold(&huart1, UART_RXFIFO_THRESHOLD_1_8) != HAL_OK){Error_Handler();}if (HAL_UARTEx_DisableFifoMode(&huart1) != HAL_OK){Error_Handler();}/* USER CODE BEGIN USART1_Init 2 *//* USER CODE END USART1_Init 2 */__HAL_UART_ENABLE_IT(&huart1,UART_IT_IDLE);HAL_UART_Receive_DMA(&huart1,USART1_RX_BUF,USART1_RX_BUF_SIZE);
}

usart.h文件修改

增加头文件和定义声明

#include "stdio.h"#define USART1_RX_BUF_SIZE 512
extern  uint8_t USART1_RX_LEN;             
extern  uint8_t USART1_RECV_FLAG;     
extern uint8_t USART1_RX_BUF[USART1_RX_BUF_SIZE];  

stm32g0xx_it.c文件修改

增加头文件

#include "usart.h"

修改void USART1_IRQHandler(void)函数

void USART1_IRQHandler(void)
{/* USER CODE BEGIN USART1_IRQn 0 */uint32_t temp;if((__HAL_UART_GET_FLAG(&huart1,UART_FLAG_IDLE) != RESET)){__HAL_UART_CLEAR_IDLEFLAG(&huart1);HAL_UART_DMAStop(&huart1);temp  =  __HAL_DMA_GET_COUNTER(&hdma_usart1_rx);USART1_RX_LEN =  USART1_RX_BUF_SIZE - temp; USART1_RECV_FLAG = USART1_RX_LEN ? 1 : 0;  HAL_UART_Receive_DMA(&huart1,USART1_RX_BUF,USART1_RX_BUF_SIZE);}/* USER CODE END USART1_IRQn 1 */
}

编译后连上串口工具调试