[ STM32F4-discovery开发板测评 ] U盘读写功能测试

jinglixixi

[ STM32F4-discovery开发板测评 ] U盘读写功能测试 [复制链接]

STM32F4-discovery开发板提供了对U盘读写的支持，利用该性能可有效地扩展存储空间。

这里是将U盘的读写功能与LCD屏显示结合在一起，以便实现后续的数码相框功能或是进行采集数据的实时记录等。

关于LCD屏显示驱动的内容参见:

https://bbs.eeworld.com.cn/thread-1258164-1-1.html

 

实现功能测试的主程序为：

int main(void)
{
  HAL_Init();
  BSP_LED_Init(LED3);
  BSP_LED_Init(LED4);
  lcd_gpio();
  Lcd_Init();
  BACK_COLOR=RED;
  LCD_Clear(RED);
  LCD_ShowString(20,5,"STM32F429",YELLOW);
  LCD_ShowString(20,25,"0.96'LCD",YELLOW);
  LCD_ShowString(20,50,"jinglixixi",YELLOW);
  HAL_Delay(2000);
  LCD_Clear(RED);
  LCD_ShowString(20,0,"USB Disk Test",YELLOW);
  SystemClock_Config();
  if(FATFS_LinkDriver(&USBH_Driver, USBDISKPath) == 0)
  {
    USBH_Init(&hUSBHost, USBH_UserProcess, 0);
    USBH_RegisterClass(&hUSBHost, USBH_MSC_CLASS);
    USBH_Start(&hUSBHost);
    while (1)
    {
      USBH_Process(&hUSBHost);
      switch(Appli_state)
      {
        case APPLICATION_START:
        MSC_Application();
        Appli_state = APPLICATION_IDLE;
        break;
        case APPLICATION_IDLE:
        default:
        break;
      }
    }
  }
  while (1);
}

进行U盘读写测试及信息显示的函数为：

static void MSC_Application(void)
{
  FRESULT res;
  uint32_t byteswritten, bytesread;
  uint8_t wtext[] = "This is STM32 working with FatFs";
  uint8_t rtext[100];
  if(f_mount(&USBDISKFatFs, (TCHAR const*)USBDISKPath, 0) != FR_OK)
  {
    Error_Handler();
  }
  else
  {
	  LCD_ShowString(20,20,"Open STM32.TXT  ",YELLOW);
      if(f_open(&MyFile, "STM32.TXT", FA_CREATE_ALWAYS | FA_WRITE) != FR_OK) 
      {
        Error_Handler();
      }
      else
      {
        res = f_write(&MyFile, wtext, sizeof(wtext), (void *)&byteswritten);
        //LCD_ShowString(20,40,"Write data  ",YELLOW);
        if((byteswritten == 0) || (res != FR_OK))
        {
          Error_Handler();
        }
        else
        {
        f_close(&MyFile);
        if(f_open(&MyFile, "STM32.TXT", FA_READ) != FR_OK)
        {
          Error_Handler();
        }
        else
        {
          res = f_read(&MyFile, rtext, sizeof(rtext), (void *)&bytesread);
          //LCD_ShowString(20,60,"Read  data  ",YELLOW);
          if((bytesread == 0) || (res != FR_OK))
          {
            Error_Handler();
          }
          else
          {
			LCD_ShowString(20,40,rtext,YELLOW);
            f_close(&MyFile);
            //LCD_ShowString(20,60,"Close file ",YELLOW);
            if((bytesread != byteswritten))
            { 
              Error_Handler();
            }
            else
            {
              BSP_LED_On(LED3);
            }
          }
        }
      }
    }
  }
  FATFS_UnLinkDriver(USBDISKPath);
}

经程序编译与下载，其测试效果如图1至图4所示。

 

图1 未连接U盘状态

 

 

图2接入U盘状态

 

 

图3显示测试过程

 

 

图4显示读取内容

lugl4313820

老师的这块显示屏，立下了汗马功劳，太乳熟悉了！

jinglixixi

lugl4313820 发表于 2023-10-17 13:07 老师的这块显示屏，立下了汗马功劳，太乳熟悉了！

哈哈，好使而已！