stm32 lin通信

STM32可以通过UART模块实现LIN通信，需要在代码中配置UART的LIN模式，并设置波特率为20Kbps。同时，还需要在发送数据时添加LIN帧头和校验位，接收数据时需要进行校验和解析。

以下是一个简单的示例代码：

// 配置UART为LIN模式
huart1.Instance = USART1;
huart1.Init.BaudRate = 20000;
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_NO_INIT;

if (HAL_UART_Init(&huart1) != HAL_OK)
{
  Error_Handler();
}

// 发送LIN帧
uint8_t data[8] = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08};
uint8_t header = 0x55;
uint8_t checksum = 0x00;

HAL_UART_Transmit(&huart1, &header, 1, HAL_MAX_DELAY);
HAL_UART_Transmit(&huart1, data, 8, HAL_MAX_DELAY);

for (int i = 0; i < 8; i++)
{
  checksum += data[i];
}

checksum = ~checksum;

HAL_UART_Transmit(&huart1, &checksum, 1, HAL_MAX_DELAY);

// 接收LIN帧
uint8_t rx_data[8];
uint8_t rx_header;
uint8_t rx_checksum = 0x00;

HAL_UART_Receive(&huart1, &rx_header, 1, HAL_MAX_DELAY);
HAL_UART_Receive(&huart1, rx_data, 8, HAL_MAX_DELAY);
HAL_UART_Receive(&huart1, &rx_checksum, 1, HAL_MAX_DELAY);

for (int i = 0; i < 8; i++)
{
  rx_checksum += rx_data[i];
}

rx_checksum = ~rx_checksum;

if (rx_header == 0x55 && rx_checksum == 0xFF)
{
  // LIN帧接收成功
}