STM32F030C8T6串口接收不定长数据

usart.c文件代码。

#include "usart.h"
#include "gpio.h"

UART_HandleTypeDef huart1;

/* USART1 init function */
void MX_USART1_UART_Init(void)
{
    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.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_RXOVERRUNDISABLE_INIT | UART_ADVFEATURE_DMADISABLEONERROR_INIT;
    huart1.AdvancedInit.OverrunDisable = UART_ADVFEATURE_OVERRUN_DISABLE;
    huart1.AdvancedInit.DMADisableonRxError = UART_ADVFEATURE_DMA_DISABLEONRXERROR;
    if (HAL_UART_Init(&huart1) != HAL_OK)
    {
        _Error_Handler(__FILE__, __LINE__);
    }

    __HAL_UART_ENABLE_IT(&huart1, UART_IT_RXNE);
    __HAL_UART_ENABLE_IT(&huart1, UART_IT_IDLE);
}

void HAL_UART_MspInit(UART_HandleTypeDef* uartHandle)
{
    GPIO_InitTypeDef GPIO_InitStruct;

    if(uartHandle->Instance == USART1)
    {
        /* USER CODE BEGIN USART1_MspInit 0 */

        /* USER CODE END USART1_MspInit 0 */
        /* USART1 clock enable */
        __HAL_RCC_USART1_CLK_ENABLE();

        /**USART1 GPIO Configuration
        PA9     ------> USART1_TX
        PA10    ------> USART1_RX
        */
        GPIO_InitStruct.Pin = GPIO_PIN_9;
        GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
        GPIO_InitStruct.Pull = GPIO_PULLUP;
        GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
        GPIO_InitStruct.Alternate = GPIO_AF1_USART1;
        HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);


        GPIO_InitStruct.Pin = GPIO_PIN_10;
        GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
        GPIO_InitStruct.Pull = GPIO_PULLUP;
        GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
        GPIO_InitStruct.Alternate = GPIO_AF1_USART1;
        HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

        /* USART1 interrupt Init */
        HAL_NVIC_SetPriority(USART1_IRQn, 3, 0);
        HAL_NVIC_EnableIRQ(USART1_IRQn);
        /* USER CODE BEGIN USART1_MspInit 1 */

        /* USER CODE END USART1_MspInit 1 */
    }
}

void HAL_UART_MspDeInit(UART_HandleTypeDef* uartHandle)
{

    if(uartHandle->Instance == USART1)
    {
        /* USER CODE BEGIN USART1_MspDeInit 0 */

        /* USER CODE END USART1_MspDeInit 0 */
        /* Peripheral clock disable */
        __HAL_RCC_USART1_CLK_DISABLE();

        /**USART1 GPIO Configuration
        PA9     ------> USART1_TX
        PA10     ------> USART1_RX
        */
        HAL_GPIO_DeInit(GPIOA, GPIO_PIN_9 | GPIO_PIN_10);

        /* USART1 interrupt Deinit */
        HAL_NVIC_DisableIRQ(USART1_IRQn);
        /* USER CODE BEGIN USART1_MspDeInit 1 */

        /* USER CODE END USART1_MspDeInit 1 */
    }
}

/*
** Rewrite fputc function and make printf function work
**/
int fputc(int ch, FILE* file)
{
    huart1.Instance->TDR = ch & 0xFF;

    while((huart1.Instance->ISR & UART_FLAG_TC) == RESET);

    return ch;
}

/*
** Rewrite fgetc function and make scanf function work
**/
int fgetc(FILE* file)
{
    while((huart1.Instance->ISR & UART_FLAG_RXNE) == RESET);

    return huart1.Instance->RDR;
}

usart.h代码：

#ifndef __usart_H
#define __usart_H

#ifdef __cplusplus
    extern "C" {
#endif

/* Includes ------------------------------------------------------------------*/
#include "stm32f0xx_hal.h"
#include 

/* Log enable/disable switch */
#define    ENABLE_LOG    1

#if ENABLE_LOG
    #define    Log(format, ...)    printf(format, ##__VA_ARGS__)
#else
    #define    Log(format, ...)
#endif

typedef struct Data
{
    uint8_t Data[256];
    uint16_t Size;
    bool ReceiveFlag;
}ReceiveUARTData_t;


void MX_USART1_UART_Init(void);


#ifdef __cplusplus
}
#endif
#endif /*__ usart_H */

中断函数代码：

uint8_t TempData[260] = {0};
uint16_t TempSize = 0;

void USART1_IRQHandler(void)
{
    /* Handle read data register not empty interruption */
    if((__HAL_UART_GET_IT(&huart1, UART_IT_RXNE) != RESET))
    {
        __HAL_UART_CLEAR_IT(&huart1, UART_IT_RXNE);

        if(__HAL_UART_GET_FLAG(&huart1, UART_FLAG_RXNE) != RESET)
        {
            __HAL_UART_CLEAR_FLAG(&huart1, UART_FLAG_RXNE);

            TempData[TempSize++] = huart1.Instance->RDR;
        }
    }

    /* Handle idle interruption */
    if((__HAL_UART_GET_IT(&huart1, UART_IT_IDLE) != RESET))
    {
        __HAL_UART_CLEAR_IT(&huart1, UART_IT_IDLE);

        if(__HAL_UART_GET_FLAG(&huart1, UART_FLAG_IDLE) != RESET)
        {
            __HAL_UART_CLEAR_FLAG(&huart1, UART_FLAG_IDLE);

            UARTData.Size = TempSize;
            memcpy(UARTData.Data, TempData, UARTData.Size);
            memset(TempData, 0, TempSize);
            TempSize = 0;
            UARTData.ReceiveFlag = true;
        }
    }
}

main.c代码：

#include "stm32f0xx_hal.h"
#include "usart.h"
#include "gpio.h"
#include <stdbool.h>
#include <ctype.h>
#include <string.h>

ReceiveUARTData_t UARTData= {{0}, 0, false};
void CharPrint(const uint8_t* Data, size_t Size);

int main(void)
{
    /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
    HAL_Init();

    /* Configure the system clock */
    SystemClock_Config();

    /* Initialize all configured peripherals */
    MX_USART1_UART_Init();

    Log("\r\n>>>>>>>>>>>>>>>>>>>> UART data transmit receive test <<<<<<<<<<<<<<<<<<<<\r\n");

    while (1)
    {
        if(UARTData.ReceiveFlag)
        {
             UARTData.ReceiveFlag = false;
             CharPrint(UARTData.Data, UARTData.Size);
             memset(UARTData.Data, 0, UARTData.Size);
             BluetoothData.Size = 0;
        }
    }
}

/*
** Brief: Print char data
**/
void CharPrint(const uint8_t* Data, size_t Size)
{
    size_t DataIndex = 0;

    for(DataIndex = 0; DataIndex < Size; DataIndex++)
    {
        if(isprint(Data[DataIndex]))
        {
            Log("%c", Data[DataIndex]);
        }
    }
}

可以注意到在中断处理的时候，我采用了双缓冲机制，保证了超长数据丢失问题，自己测试了可以正常使用。