STM32F030C8T6 serial port receives variable length data

usart.c file code.

#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 code:

#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

/*__usart_H */ #endif /*__usart_H */

Interrupt function code:

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 code:

#include "stm32f0xx_hal.h"

#include "usart.h"

#include "gpio.h"

#include

#include

#include

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(sprint(Data[DataIndex]))

        {

            Log("%c", Data[DataIndex]);

        }

    }

}

It can be noticed that when processing interrupts, I used a double buffering mechanism to ensure that the problem of excessive data loss is solved. I tested it myself and it works normally.