STM32串口实现不定长数据接受发送源程序 -

/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "stm32f1xx_hal.h"
#include "dma.h"
#include "usart.h"
#include "gpio.h"
/* USER CODE BEGIN Includes */
/* USER CODE END Includes */
/* Private variables ---------------------------------------------------------*/
/* USER CODE BEGIN PV */
/* Private variables ---------------------------------------------------------*/
uint8_t Rx_flag = 0;
uint8_t TxBuf[TX_DATA_LEN] = {0};
uint8_t RxBuf[RX_DATA_LEN] = {0};
uint8_t recv_end_flag = 0,Rx_len;
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */
/* Private function prototypes -----------------------------------------------*/
/* USER CODE END PFP */
/* USER CODE BEGIN 0 */
/* USER CODE END 0 */
int main(void)
{
/* USER CODE BEGIN 1 */
/* 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_USART1_UART_Init();
/* USER CODE BEGIN 2 */
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_8, GPIO_PIN_RESET);
HAL_Delay(1000);
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_8, GPIO_PIN_SET);
for(Rx_flag = 0; Rx_flag < TX_DATA_LEN; Rx_flag++)
{
TxBuf[Rx_flag] = Rx_flag;
}
Rx_flag = 0;
/* 使用DMA传输数据到电脑端 */
RS485_TX_MODE(); //进入发送模式
HAL_UART_Transmit_DMA(&huart1,TxBuf, 150);
HAL_Delay(10);
HAL_UART_Receive_DMA(&huart1,RxBuf, 5);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
if(recv_end_flag ==1)
{
RS485_TX_MODE(); //进入发送模式
HAL_UART_Transmit_DMA(&huart1,(uint8_t *)RxBuf,Rx_len);
Rx_flag = 0;
HAL_Delay(100);
for(int i = 0; i < Rx_len ; i++)
RxBuf[i]=0;
Rx_len=0;
recv_end_flag=0;
/* ready for next receive */
RS485_RX_MODE();
HAL_UART_Receive_DMA(&huart1,(uint8_t*)RxBuf, 30);
}
//USART DMA mode
// if(Rx_flag == 1)
// {
// RS485_TX_MODE(); //进入发送模式
// HAL_UART_Transmit_DMA(&huart1,(uint8_t *)RxBuf,32);
// Rx_flag = 0;
// HAL_Delay(10);
// }
// if(Rx_flag == 2)
// {
// HAL_GPIO_TogglePin(GPIOA,GPIO_PIN_8);
// Rx_flag = 0;
// }
// //TxRx INT mode
// if(Rx_flag == 1)
// {
// RS485_TX_MODE(); //进入发送模式
// HAL_UART_Transmit_IT(&huart1,(uint8_t *)TxBuf,6);
// Rx_flag = 0;
// HAL_Delay(100);
// }
// TxRx blocking mode
// /* 进入发送模式 */
// RS485_TX_MODE();
//// HAL_Delay(10);
// /* 发送数据,轮询直到发送数据完毕 */
// if(HAL_UART_Transmit(&huart1, temp,DATA_LEN,100)==HAL_OK)
// {
// while(__HAL_UART_GET_FLAG(&huart1,UART_FLAG_TC)!=1);
// }
//
//// HAL_Delay(100);
// /* 进入接收模式 */
// RS485_RX_MODE();
//// HAL_Delay(10);
// /* 轮询直到485接收到数据 */
// while( __HAL_UART_GET_FLAG(&huart1,UART_FLAG_RXNE)!= HAL_ERROR);
// HAL_UART_Receive(&huart1,temp,DATA_LEN,100);
//// HAL_Delay(10);
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
/** System Clock Configuration
*/
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct;
RCC_ClkInitTypeDef RCC_ClkInitStruct;
/**Initializes the CPU, AHB and APB busses clocks
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}
/**Initializes the CPU, AHB and APB busses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV2;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}
/**Configure the Systick interrupt time
*/
HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/1000);
/**Configure the Systick
*/
HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);
/* SysTick_IRQn interrupt configuration */
HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);
}
/* USER CODE BEGIN 4 */
/* USER CODE END 4 */
/**
* @brief This function is executed in case of error occurrence.
* @param None
* @retval None
*/
void _Error_Handler(char * file, int line)
{
/* USER CODE BEGIN Error_Handler_Debug */
/* User can add his own implementation to report the HAL error return state */
while(1)
{
}
/* USER CODE END Error_Handler_Debug */
}
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t* file, uint32_t line)
{
/* USER CODE BEGIN 6 */
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
/* USER CODE END 6 */
}
#endif
/**
* @}
*/
/**
* @}
*/

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