基于stm32G070CBT6的串口1和串口3的中断完成rs485的数据接收和发送，生成代码

以下是基于STM32G070CBT6的串口1和串口3的中断完成RS485数据接收和发送的代码示例。您可以在HAL库的基础上进行修改和扩展。

#include "stm32g0xx.h"
#include "stm32g0xx_hal.h"

#define RS485_DE_GPIO_Port   GPIOA
#define RS485_DE_Pin         GPIO_PIN_8
#define RS485_RE_GPIO_Port   GPIOA
#define RS485_RE_Pin         GPIO_PIN_9

UART_HandleTypeDef huart1;
UART_HandleTypeDef huart3;

uint8_t rx1_data;  // 接收缓冲区数据
uint8_t rx3_data;  // 接收缓冲区数据

void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_USART1_UART_Init(void);
static void MX_USART3_UART_Init(void);

void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
  if (huart->Instance == USART1)
  {
    // 处理USART1接收中断
    // ...
    // 您的代码逻辑
    // ...
    HAL_UART_Receive_IT(&huart1, &rx1_data, 1);  // 启动下一次接收
  }
  else if (huart->Instance == USART3)
  {
    // 处理USART3接收中断
    // ...
    // 您的代码逻辑
    // ...
    HAL_UART_Receive_IT(&huart3, &rx3_data, 1);  // 启动下一次接收
  }
}

void HAL_UART_TxCpltCallback(UART_HandleTypeDef *huart)
{
  if (huart->Instance == USART1)
  {
    // 处理USART1发送中断
    // ...
    // 您的代码逻辑
    // ...
    HAL_GPIO_WritePin(RS485_RE_GPIO_Port, RS485_RE_Pin, GPIO_PIN_SET);  // 切换为接收模式
  }
  else if (huart->Instance == USART3)
  {
    // 处理USART3发送中断
    // ...
    // 您的代码逻辑
    // ...
    HAL_GPIO_WritePin(RS485_RE_GPIO_Port, RS485_RE_Pin, GPIO_PIN_SET);  // 切换为接收模式
  }
}

int main(void)
{
  HAL_Init();
  SystemClock_Config();
  MX_GPIO_Init();
  MX_USART1_UART_Init();
  MX_USART3_UART_Init();

  while (1)
  {
    // 主循环中的其他任务
    // ...
    // 您的代码逻辑
    // ...
  }
}

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

  /** Configure LSE Drive Capability
  */
  HAL_PWR_EnableBkUpAccess();
  __HAL_RCC_LSEDRIVE_CONFIG(RCC_LSEDRIVE_MEDIUMHIGH);
  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI | RCC_OSCILLATORTYPE_LSE;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  RCC_OscInitStruct.LSEState = RCC_LSE_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL4;
  RCC_OscInitStruct.PLL.PLLDIV = RCC_PLL_DIV2;
  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_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)
  {
    Error_Handler();
  }
}

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

  // 启动接收中断
  HAL_UART_Receive_IT(&huart1, &rx1_data, 1);
}

static void MX_USART3_UART_Init(void)
{
  huart3.Instance = USART3;
  huart3.Init.BaudRate = 115200;
  huart3.Init.WordLength = UART_WORDLENGTH_8B;
  huart3.Init.StopBits = UART_STOPBITS_1;
  huart3.Init.Parity = UART_PARITY_NONE;
  huart3.Init.Mode = UART_MODE_TX_RX;
  huart3.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart3.Init.OverSampling = UART_OVERSAMPLING_16;
  if (HAL_UART_Init(&huart3) != HAL_OK)
  {
    Error_Handler();
  }

  // 启动接收中断
  HAL_UART_Receive_IT(&huart3, &rx3_data, 1);
}

static void MX_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};

  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOA_CLK_ENABLE();

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(RS485_RE_GPIO_Port, RS485_RE_Pin, GPIO_PIN_SET);

  /*Configure GPIO pin : RS485_RE_Pin */
  GPIO_InitStruct.Pin = RS485_RE_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(RS485_RE_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pin : RS485_DE_Pin */
  GPIO_InitStruct.Pin = RS485_DE_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(RS485_DE_GPIO_Port, &GPIO_InitStruct);
}

在这个示例代码中，我们使用了USART1和USART3作为RS485通信的两个串口，并在中断回调函数中处理接收和发送的逻辑。同时，我们使用了GPIO引脚来控制RS485芯片的发送使能（DE）和接收使能（RE）引脚。

请注意，这只是一个基本的框架，您需要根据实际需求进行修改和扩展，例如添加数据处理和错误处理等。另外，还需要根据您的具体硬件连接情况来配置引脚和串口参数。

希望这个示例能对您有所帮助！