stm32 hal库通过串口实现和RS485传感器通讯并进行数据CRC-16校验的代码

您好，以下是您所提到的问题的代码实现：

#include "main.h"
#include "stm32f1xx_hal.h"

#define RS485_DE_HIGH() HAL_GPIO_WritePin(GPIOA, GPIO_PIN_8, GPIO_PIN_SET)
#define RS485_DE_LOW() HAL_GPIO_WritePin(GPIOA, GPIO_PIN_8, GPIO_PIN_RESET)

UART_HandleTypeDef huart1;

void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_USART1_UART_Init(void);

uint16_t calcCRC16(uint8_t *data, uint16_t len)
{
uint16_t crc = 0xFFFF;
uint16_t i, j;
for (i = 0; i < len; i++)
{
crc ^= data[i];
for (j = 0; j < 8; j++)
{
if (crc & 0x0001)
{
crc >>= 1;
crc ^= 0xA001;
}
else
{
crc >>= 1;
}
}
}
return crc;
}

void sendRS485Data(uint8_t *data, uint16_t len)
{
RS485_DE_HIGH();
HAL_UART_Transmit(&huart1, data, len, 100);
RS485_DE_LOW();
}

int main(void)
{
HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
MX_USART1_UART_Init();

uint8_t sendData[8] = {0x01, 0x03, 0x00, 0x01, 0x00, 0x01, 0x84, 0x0A};
uint16_t crc = calcCRC16(sendData, 6);
sendData[6] = crc & 0xFF;
sendData[7] = (crc >> 8) & 0xFF;

while (1)
{
sendRS485Data(sendData, 8);
HAL_Delay(1000);
}
}

void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
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();
}
/** Initializes the CPU, AHB and APB buses 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_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
{
Error_Handler();
}
}

static void MX_USART1_UART_Init(void)
{

huart1.Instance = USART1;
huart1.Init.BaudRate = 9600;
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;
if (HAL_UART_Init(&huart1) != HAL_OK)
{
Error_Handler();
}
}

static void MX_GPIO_Init(void)
{

GPIO_InitTypeDef GPIO_InitStruct = {0};

__HAL_RCC_GPIOA_CLK_ENABLE();

HAL_GPIO_WritePin(GPIOA, GPIO_PIN_8, GPIO_PIN_RESET);

GPIO_InitStruct.Pin = GPIO_PIN_8;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
}

void Error_Handler(void)
{
while (1)
{
}
}

void SysTick_Handler(void)
{
HAL_IncTick();
}

void assert_failed(uint8_t *file, uint32_t line)
{
}

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