【STM32H7S78-DK测评】3、串口通信测试

只看该作者 · 2024-9-7 20:47

本帖最后由 sujingliang 于 2024-9-7 21:05 编辑

目的
实现板载调试串口通讯，实现字符串打印输出“Hello 21ic, Hello STM32H7S78-DK!"

一、硬件准备
STLINK虚拟串口连接到PD0、PD1，对应UART4

STM32CubeMX中对UART4配置

二、TouchGFX配置
增加一个Screen3，添加几个部件

增加一个Ineraction
trigger：Button clicked
Choose clicked Soucre：buttonUartSend
Action：Call new virtual fuciton
Funciton Name： uartSend
实现按下buttonUartSend按键，触发uartSend函数。

三、Uart4初始化及printf重定向
STM32CubeMX配置UART4后，生成如下代码：

复制

/**

  * [url=home.php?mod=space&uid=247401]@brief[/url] UART4 Initialization Function

  * @param None

  * @retval None

  */

static void MX_UART4_Init(void)

{



  /* USER CODE BEGIN UART4_Init 0 */



  /* USER CODE END UART4_Init 0 */



  /* USER CODE BEGIN UART4_Init 1 */



  /* USER CODE END UART4_Init 1 */

  huart4.Instance = UART4;

  huart4.Init.BaudRate = 115200;

  huart4.Init.WordLength = UART_WORDLENGTH_8B;

  huart4.Init.StopBits = UART_STOPBITS_1;

  huart4.Init.Parity = UART_PARITY_NONE;

  huart4.Init.Mode = UART_MODE_TX_RX;

  huart4.Init.HwFlowCtl = UART_HWCONTROL_NONE;

  huart4.Init.OverSampling = UART_OVERSAMPLING_16;

  huart4.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;

  huart4.Init.ClockPrescaler = UART_PRESCALER_DIV1;

  huart4.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;

  if (HAL_UART_Init(&huart4) != HAL_OK)

  {

    Error_Handler();

  }

  if (HAL_UARTEx_SetTxFifoThreshold(&huart4, UART_TXFIFO_THRESHOLD_1_8) != HAL_OK)

  {

    Error_Handler();

  }

  if (HAL_UARTEx_SetRxFifoThreshold(&huart4, UART_RXFIFO_THRESHOLD_1_8) != HAL_OK)

  {

    Error_Handler();

  }

  if (HAL_UARTEx_DisableFifoMode(&huart4) != HAL_OK)

  {

    Error_Handler();

  }

  /* USER CODE BEGIN UART4_Init 2 */



  /* USER CODE END UART4_Init 2 */



}

添加printf重定向：

复制

#if defined(__ICCARM__)

__ATTRIBUTES size_t __write(int, const unsigned char *, size_t);

#endif /* __ICCARM__ */



#if defined(__ICCARM__)

/* New definition from EWARM V9, compatible with EWARM8 */

int iar_fputc(int ch);

#define PUTCHAR_PROTOTYPE int iar_fputc(int ch)

#elif defined ( __CC_ARM ) || defined(__ARMCC_VERSION)

/* ARM Compiler 5/6*/

#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)

#elif defined(__GNUC__)

#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)

#endif /* __ICCARM__ */

复制



/**

  * [url=home.php?mod=space&uid=247401]@brief[/url]  Retargets the C library printf function to the USART.

  * @param  None

  * @retval None

  */

PUTCHAR_PROTOTYPE

{

  /* Place your implementation of fputc here */

  /* e.g. write a character to the USART3 and Loop until the end of transmission */

  HAL_UART_Transmit(&huart4, (uint8_t *)&ch, 1, 0xFFFF);



  return ch;

}



int fgetc(FILE *f)

{

        int ch;

        /* 等待串口输入数据 */

        while (__HAL_UART_GET_FLAG(&huart4, UART_FLAG_RXNE) == RESET);

        HAL_UART_Receive(&huart4, (uint8_t *)&ch, 1, 0xFFFF);

        return (ch);

}



#if defined(__ICCARM__)

size_t __write(int file, unsigned char const *ptr, size_t len)

{

  size_t idx;

  unsigned char const *pdata = ptr;



  for (idx = 0; idx < len; idx++)

  {

    iar_fputc((int)*pdata);

    pdata++;

  }

  return len;

}

#endif /* __ICCARM__ */

如果用gcc，需要确保makefile中包括syscalls.c。当然还要有
$(Drivers_path)/STM32H7RSxx_HAL_Driver/Src/stm32h7rsxx_hal_uart.c
$(Drivers_path)/STM32H7RSxx_HAL_Driver/Src/stm32h7rsxx_hal_uart_ex.c

四、MVP架构实现通过TouchGFX驱动串口发送信息

1、Model.cpp中增加

复制

void Model::uart4SendTest()

{

        printf("Hello 21ic, Hello STM32H7S78-DK!\r\n");

}

2、Screen3View中增加

复制

void Screen3View::uartSend()

{

        presenter->uart4SendTest();

}

3、Screen3Presenter中增加

复制

void Screen3Presenter::uart4SendTest()

{

        model->uart4SendTest();

}

五、效果

按下“UartSend”，串口会打印出信息。