STM32 通过 Modbus 协议更改内部闪存（模拟 EEPROM）的工作参数

main.c测试 

uint8_t uart1RxBuf[64]={0};

uint8_t Adc1ConvEnd=0;
uint8_t Adc2ConvEnd=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();
  /* USER CODE BEGIN 2 */
  /* Debug: UART3 for debugging and printf */
  MX_USART3_UART_Init();

  /* Modbus: UART1 is used to transmit and receive modbus protocol */
  MX_USART1_UART_Init();
  HAL_UARTEx_ReceiveToIdle_IT(&huart1, (uint8_t *)&uart1RxBuf, 64);

  /* EEPROM */
  if(WriteDefaultEE()!=0)
  {
      Error_Handler();
  }

  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
      /* Change flash operating parameters over modbus */
      Modbus_Event();

    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
  }
  /* USER CODE END 3 */
}


/* USER CODE BEGIN 4 */
void HAL_UARTEx_RxEventCallback(UART_HandleTypeDef *huart, uint16_t Size)
{
    if (huart->Instance == USART1)
    {
        if (huart->RxEventType == HAL_UART_RXEVENT_IDLE) {
            modbusData.reFlag=1;
            HAL_UARTEx_ReceiveToIdle_IT(&huart1, (uint8_t *)&uart1RxBuf, 64);//调用接收中断函数
        }
    }
    UNUSED(Size);
}

 CRC16校验

#include <stdio.h>
#include "stdint.h"

uint16_t ModRTU_CRC(const uint8_t buf[], uint8_t len)
{
    uint16_t crc = 0xFFFF;
    uint16_t pos = 0;
    uint8_t index = 0;

    for (pos = 0; pos < len; pos++)
    {
        crc ^= (unsigned int)buf[pos]; // XOR byte into least sig. byte of CRC

        for (index = 8; index != 0; index--) // Loop over each bit
        {
            if ((crc & 0x0001) != 0) // If the LSB is set
            {
                crc >>= 1; // Shift right and XOR 0xA001
                crc ^= 0xA001;
            }
            else // Else LSB is not set
            {
                crc >>= 1; // Just shift right
            }
        }
    }
    // Note, this number has low and high bytes swapped, so use it accordingly
    return crc;
}


int main()
{
	uint8_t buf[6]={0x0A ,0x03 ,0x00 ,0x00 ,0x00 ,0x07 };
	uint8_t crcval=0;
	
	crcval=ModRTU_CRC(buf,6);
	
	printf("%x \r\n",crcval);

	return 0;
}