哪位老哥整过stm32串口硬件流控制的代码啊 -

标题: 哪位老哥整过stm32串口硬件流控制的代码啊 [打印本页]

作者: Xiuer66 时间: 2023-5-25 16:28
标题: 哪位老哥整过stm32串口硬件流控制的代码啊

作者: 飞云居士 时间: 2023-5-25 16:28
以下是一个使用STM32的标准库（HAL库）实现硬件流控制的串口代码，用于控制UART2：

#include "stm32f4xx_hal.h"

UART_HandleTypeDef huart2;

void SystemClock_Config(void);

int main(void)
{
  HAL_Init();

  SystemClock_Config();

  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_USART2_CLK_ENABLE();

  GPIO_InitTypeDef GPIO_InitStruct = {0};
  GPIO_InitStruct.Pin = GPIO_PIN_2|GPIO_PIN_3;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_PULLUP;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
  GPIO_InitStruct.Alternate = GPIO_AF7_USART2;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  huart2.Instance = USART2;
  huart2.Init.BaudRate = 115200;
  huart2.Init.WordLength = UART_WORDLENGTH_8B;
  huart2.Init.StopBits = UART_STOPBITS_1;
  huart2.Init.Parity = UART_PARITY_NONE;
  huart2.Init.Mode = UART_MODE_TX_RX;
  huart2.Init.HwFlowCtl = UART_HWCONTROL_RTS_CTS;
  huart2.Init.OverSampling = UART_OVERSAMPLING_16;
  if (HAL_UART_Init(&huart2) != HAL_OK)
  {
while (1);
  }

  uint8_t buffer[] = "Hello, world!\r\n";

  while (1)
  {
if (HAL_UART_Transmit(&huart2, buffer, sizeof(buffer), 100) != HAL_OK)
{
   while (1);
}

HAL_Delay(1000);
  }
}

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

  /** Configure the main internal regulator output voltage
  */
  __HAL_RCC_PWR_CLK_ENABLE();
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE3);
  /** Initializes the CPU, AHB and APB busses clocks
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
  RCC_OscInitStruct.PLL.PLLM = 16;
  RCC_OscInitStruct.PLL.PLLN = 336;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV4;
  RCC_OscInitStruct.PLL.PLLQ = 7;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
while (1);
  }
  /** Initializes the CPU, AHB and APB busses 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_DIV4;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
  {
while (1);
  }
}
在以上代码中，我们使用了硬件流控制（RTS/CTS）来实现串口的数据传输。在初始化UART时，我们将Mode设置为UART_MODE_TX_RX，以允许UART同时进行发送和接收。我们还将HwFlowCtl设置为UART_HWCONTROL_RTS_CTS，以启用硬件流控制。

此时，CTS引脚应该配置为输入模式，如上述代码所示，我们使用GPIOA2引脚作为CTS。在数据发送时，如果CTS引脚处于逻辑高电平，则UART不会将数据发送到接收端，而会等待CTS引脚返回逻辑低电平，然后再继续发送数据。

请注意，上述代码主要用于示例演示，因此省略了错误处理和异常情况处理。在实际应用中，需要根据具体需求添加适当的错误处理和异常情况处理。

作者: 飞云居士 时间: 2023-5-28 17:06
以下是一个使用STM32的标准库（HAL库）实现硬件流控制的串口代码，用于控制UART2：

#include "stm32f4xx_hal.h"

UART_HandleTypeDef huart2;

void SystemClock_Config(void);

int main(void)
{
  HAL_Init();

  SystemClock_Config();

  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_USART2_CLK_ENABLE();

  GPIO_InitTypeDef GPIO_InitStruct = {0};
  GPIO_InitStruct.Pin = GPIO_PIN_2|GPIO_PIN_3;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_PULLUP;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
  GPIO_InitStruct.Alternate = GPIO_AF7_USART2;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  huart2.Instance = USART2;
  huart2.Init.BaudRate = 115200;
  huart2.Init.WordLength = UART_WORDLENGTH_8B;
  huart2.Init.StopBits = UART_STOPBITS_1;
  huart2.Init.Parity = UART_PARITY_NONE;
  huart2.Init.Mode = UART_MODE_TX_RX;
  huart2.Init.HwFlowCtl = UART_HWCONTROL_RTS_CTS;
  huart2.Init.OverSampling = UART_OVERSAMPLING_16;
  if (HAL_UART_Init(&huart2) != HAL_OK)
  {
while (1);
  }

  uint8_t buffer[] = "Hello, world!\r\n";

  while (1)
  {
if (HAL_UART_Transmit(&huart2, buffer, sizeof(buffer), 100) != HAL_OK)
{
   while (1);
}

HAL_Delay(1000);
  }
}

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

  /** Configure the main internal regulator output voltage
  */
  __HAL_RCC_PWR_CLK_ENABLE();
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE3);
  /** Initializes the CPU, AHB and APB busses clocks
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
  RCC_OscInitStruct.PLL.PLLM = 16;
  RCC_OscInitStruct.PLL.PLLN = 336;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV4;
  RCC_OscInitStruct.PLL.PLLQ = 7;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
while (1);
  }
  /** Initializes the CPU, AHB and APB busses 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_DIV4;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
  {
while (1);
  }
}
在以上代码中，我们使用了硬件流控制（RTS/CTS）来实现串口的数据传输。在初始化UART时，我们将Mode设置为UART_MODE_TX_RX，以允许UART同时进行发送和接收。我们还将HwFlowCtl设置为UART_HWCONTROL_RTS_CTS，以启用硬件流控制。

此时，CTS引脚应该配置为输入模式，如上述代码所示，我们使用GPIOA2引脚作为CTS。在数据发送时，如果CTS引脚处于逻辑高电平，则UART不会将数据发送到接收端，而会等待CTS引脚返回逻辑低电平，然后再继续发送数据。

请注意，上述代码主要用于示例演示，因此省略了错误处理和异常情况处理。在实际应用中，需要根据具体需求添加适当的错误处理和异常情况处理。

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