【AT-START-F425 Review】Reading USB files to achieve image reproduction

jinglixixi

【AT-START-F425 Review】Reading USB files to achieve image reproduction [Copy link]

 

Since the core chip used by AT-START-F425 is a USB-oriented microcontroller and provides corresponding USB flash drive reading and writing functions, it can realize two applications, namely, one is to use the file reading function to build a picture library or character library to expand the storage space, and the other is to use the file storage function to act as a data recording device.

Here we will first introduce its reading function to realize image reproduction. Of course, the premise is that the prepared image file has been stored in the U disk, and secondly, there is the support of a color display. The display used here is a 0.96-inch OLED color display.

For testing purposes, a monochrome image file is first stored in the file, and its display effect is shown in Figure 1.

Figure 1 Test effect

The statement to determine whether the specified file is opened is:

if(f_open(&file, "0: zsh.bmp", FA_READ) != FR_OK)

When the specified file is opened successfully, the display program is:

for(i=0;i<N;i++)
{
	res = f_read(&file, read_datp, sizeof(read_datp), &len);
	// 绘制一行彩线
	for(j=0;j<80;j++)
	{
		  LCD_WR_DATA8(gImage_cgq[j*2]);
          LCD_WR_DATA8(gImage_cgq[j*2+1]);
	}
}

From the test results, we can see that there is no problem in opening the *.BMP file, and its data can be read and displayed.

Next, a parameter picture display can be generated, and the effect is shown in Figure 2.

Figure 2 Display image

The program to display this effect is:

if(f_open(&file, "0:YX32.bin", FA_READ) != FR_OK)
{
       USBH_DEBUG("Open AT32.txt failed");
}
else
{
      for(i=0;i<80;i++)
	  {
			res = f_read(&file, read_datp, sizeof(read_datp), &len);
		    for(j=0;j<160;j++)
		    {
		        LCD_WR_DATA8(read_datp[j*2]);
                LCD_WR_DATA8(read_datp[j*2+1]); 
		    }
	  }
      if(res != FR_OK || len == 0)
      {
         USBH_DEBUG("Read AT32.txt failed");
      }
      else
      {
         USBH_DEBUG("Read AT32.txt Success");
      }
      f_close(&file);
    }
    f_mount(NULL, "", 0); 
}

After completing the above basic tests, we can explore the reading of multiple files to realize the function of digital photo frame. The display effect is shown in Figures 3 and 4.

Figure 3 Digital photo frame effect 1

Figure 4 Digital photo frame effect 2

The program to implement this function is:

static usb_sts_type usbh_user_application(void)
{
  usb_sts_type status = USB_OK;
  FRESULT res;
  int i,j,z;
  uint32_t len;
  res = f_mount(&fs, "", 0);
  if(res == FR_OK)
  {
	for(z=0;z<3;z++)
	{
		if(z==0) f_open(&file, "0:YX32.bin", FA_READ);
		if(z==1) f_open(&file, "0:HKTK.bin", FA_READ);
		if(z==2) f_open(&file, "0:HY32.bin", FA_READ);
		for(i=0;i<80;i++)
		{
			    res = f_read(&file, read_datp, sizeof(read_datp), &len);
			    for(j=0;j<160;j++)
			    {
			        LCD_WR_DATA8(read_datp[j*2]);
                    LCD_WR_DATA8(read_datp[j*2+1]);
			    }
		}
        f_close(&file);
        delay_ms(2000);
	}
    f_mount(NULL, "", 0); 
  }
  return status;  
}

From this we can see that the file reading function of the AT-START-F425 development board is still very powerful.

lugl4313820

This is an interesting idea. I feel that this chip is still very powerful. If the price is affordable, it should have great prospects!

freebsder

USB and LCD are connected

jinglixixi

lugl4313820 posted on 2022-4-21 14:58 This is an idea. I feel that this chip is still very powerful. If the price is affordable, it should have a bright future!

It is still better to use.

jinglixixi

freebsder posted on 2022-4-21 22:33 USB and LCD are connected

Haha, give it a try.