这个usart2的tx引脚模式默认只有pp一种，要改成OD模式，可以直接在源程序里面改，注意再次生成后，需要再次修改
要把配置生成适应另一种芯片的程序，要重新新建程序
注意DMA的循环模式和正常模式区分
定时器要和时钟一致
其他系列教程参考www.waveshare.net/study/artic…
要下载cube中文使用手册和HAL库参考download.csdn.net/download/fe…
多路DMA_AD采集+定时器+串口发送+printf部分源程序：
printf：（在uart.c里面添加下列程序）
/* USER CODE BEGIN 0 */
typedef struct __FILE FILE;
/* USER CODE END 0 */
/* USER CODE BEGIN 1 */
#ifdef __GNUC__
/* With GCC/RAISONANCE, small printf (option LD Linker->Libraries->Small printf
set to 'Yes') calls __io_putchar() */
#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#else
#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
#endif /* __GNUC__ */
/**
* @brief Retargets the C library printf function to the USART.
* @param None
* @retval None
*/
PUTCHAR_PROTOTYPE
{
/* Place your implementation of fputc here */
/* e.g. write a character to the EVAL_COM1 and Loop until the end of transmission */
HAL_UART_Transmit(&huart1, (uint8_t *)&ch, 1, 0xFFFF);
return ch;
}
/* USER CODE END 1 */
串口：（注意初始化时要开启串口字节中断）
void USART1_IRQHandler(void)
{
/* USER CODE BEGIN USART1_IRQn 0 */
/* USER CODE END USART1_IRQn 0 */
HAL_UART_IRQHandler(&huart1);
/* USER CODE BEGIN USART1_IRQn 1 */
static uint8_t len_temp = 0;
char rx_temp[128];
if((__HAL_UART_GET_FLAG(&huart1,UART_FLAG_RXNE)!=RESET))
{
rx_temp[len_temp++] = (uint8_t)(huart1.Instance->DR&(uint8_t)0x00FF);
__HAL_UART_ENABLE_IT(&huart1,UART_IT_IDLE); //open IDLE
}
else if((__HAL_UART_GET_FLAG(&huart1,UART_FLAG_IDLE)!=RESET)) //receive ok
{
__HAL_UART_DISABLE_IT(&huart1,UART_IT_IDLE); //close IDLE
//memcpy(dest, rx_temp, n)
memset(&rx_temp, 0, sizeof(rx_temp));//clear temp
len_temp = 0;//again save
}
/* USER CODE END USART1_IRQn 1 */
}
主程序部分（喂狗+DMA）：
int main(void)
{
/* USER CODE BEGIN 1 */
// uint8_t temp_buff[12] = {0,1,2,3,4,5,6,7,8,9,10,11};
/* USER CODE END 1 */
/* MCU Configuration----------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_DMA_Init();
MX_ADC1_Init();
MX_USART1_UART_Init();
MX_TIM1_Init();
MX_IWDG_Init();
/* USER CODE BEGIN 2 */
__HAL_UART_ENABLE_IT(&huart1,UART_IT_RXNE);
HAL_IWDG_Init(&hiwdg);//cube先设置好
// printf("\n\r***** start main before while *****\n\r");
HAL_ADC_Start_DMA(&hadc1,(uint32_t*)&ADC_Value,4);//DMA循环模式只需调用1次，正常模式调用1次采1次
HAL_TIM_Base_Start_IT(&htim1);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
HAL_IWDG_Refresh(&hiwdg);//喂狗
//其它
}
}
定时中断：（主要在cube设置，可参考上文教程链接）
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)//0.2秒中断
{
if (htim->Instance == htim1.Instance)
{
}
}
