openmv 与stm32 串口通信库函数代码

以下是一个使用STM32的HAL库函数与OpenMV通信的示例代码:

#include "stm32f4xx_hal.h"
#include <string.h>

UART_HandleTypeDef huart1;

void SystemClock_Config(void);

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

  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_USART1_CLK_ENABLE();
  
  GPIO_InitTypeDef GPIO_InitStruct = {0};
  GPIO_InitStruct.Pin = GPIO_PIN_9|GPIO_PIN_10;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
  GPIO_InitStruct.Alternate = GPIO_AF7_USART1;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  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();
  }

  uint8_t rxBuffer[100];
  uint8_t txBuffer[100];
  uint8_t rxData;
  uint16_t rxIndex = 0;

  while (1)
  {
    if (HAL_UART_Receive(&huart1, &rxData, 1, 100) == HAL_OK)
    {
      if (rxIndex < 99)
      {
        rxBuffer[rxIndex++] = rxData;
      }
      else
      {
        rxIndex = 0;
      }
    }

    if (rxData == '\n')
    {
      // do something with received data here
      sprintf(txBuffer, "Received: %s", rxBuffer);
      HAL_UART_Transmit(&huart1, txBuffer, strlen(txBuffer), 1000);
      memset(rxBuffer, 0, sizeof(rxBuffer));
      rxIndex = 0;
    }
  }
}

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_HSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
  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_HSI;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
  {
    Error_Handler();
  }
}

在此示例中，我们使用USART1与OpenMV通信。我们在PA9和PA10引脚上启用了USART1，并使用115200波特率初始化了UART。

在主循环中，我们使用HAL_UART_Receive()函数接收数据。当接收到新数据时，我们将其添加到rxBuffer数组中，直到接收到换行符。然后，我们分析接收到的数据并执行相应的操作。在此示例中，我们只是将收到的数据发送回OpenMV。