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[MCB2300] - LPC2368 - UVC - help

goway xu over 15 years ago

I have one MCB2300,the demo "USBUVC",how can I add a jpg
file for test? thank you,very much.

Parents

0 goway xu over 15 years ago in reply to Tsuneo Chinzei

1. I added the jpg data to the demo:

#ifndef _JPG_GLOBAL_
extern const unsigned int JPG_size;
extern const unsigned char JPG_data[];
#else
const unsigned int JPG_size = 0x2c5a;
const unsigned char JPG_data[] =
{
  0xff,0xd8,0xff,0xe0,0x00,0x10
  .....
  .....
  0xfd,0x7f,0x4c,0xff,0xd9
};

2. transfer process

volatile DWORD TestCnt;
volatile DWORD JPG_Cnt;
#define EP3_MAX_PACKET 0x1FE

#if USB_SOF_EVENT
void USB_SOF_Event (void) {
  TestCnt++;
  if((JPG_size - JPG_Cnt) > EP3_MAX_PACKET)
  {
    USB_WriteEP(0x83,(BYTE *)(JPG_data + JPG_Cnt),EP3_MAX_PACKET);
    JPG_Cnt += EP3_MAX_PACKET;
  }
  else
  {
    USB_WriteEP(0x83,(BYTE *)(JPG_data + JPG_Cnt),JPG_size - JPG_Cnt);
    JPG_Cnt = 0;
  }
}
#endif

The data transfer to the host, I can see it with a usb
tool - USBTrace. But the jpg can't display on the PC.
Maybe need do something else.

Reply

0 goway xu over 15 years ago in reply to Tsuneo Chinzei

1. I added the jpg data to the demo:

#ifndef _JPG_GLOBAL_
extern const unsigned int JPG_size;
extern const unsigned char JPG_data[];
#else
const unsigned int JPG_size = 0x2c5a;
const unsigned char JPG_data[] =
{
  0xff,0xd8,0xff,0xe0,0x00,0x10
  .....
  .....
  0xfd,0x7f,0x4c,0xff,0xd9
};

2. transfer process

volatile DWORD TestCnt;
volatile DWORD JPG_Cnt;
#define EP3_MAX_PACKET 0x1FE

#if USB_SOF_EVENT
void USB_SOF_Event (void) {
  TestCnt++;
  if((JPG_size - JPG_Cnt) > EP3_MAX_PACKET)
  {
    USB_WriteEP(0x83,(BYTE *)(JPG_data + JPG_Cnt),EP3_MAX_PACKET);
    JPG_Cnt += EP3_MAX_PACKET;
  }
  else
  {
    USB_WriteEP(0x83,(BYTE *)(JPG_data + JPG_Cnt),JPG_size - JPG_Cnt);
    JPG_Cnt = 0;
  }
}
#endif

The data transfer to the host, I can see it with a usb
tool - USBTrace. But the jpg can't display on the PC.
Maybe need do something else.

Children

0 goway xu over 15 years ago in reply to goway xu

I use two bytes for Payload Header Field,but fail too.

#if USB_SOF_EVENT
void USB_SOF_Event (void)
{
  /* Payload header - SOF_Event_Buf[0~1] */
  if(JPG_Cnt == 0) /* Start of Frame */
  {
    SOF_Event_Buf[0]  = 0x02;
    SOF_Event_Buf[1] &= 0x01;
  }
  else
  {
    SOF_Event_Buf[1] ^= 0x01; /* FID */

    /* The last packet of jpg */
    if((JPG_size - JPG_Cnt) <= (EP3_MAX_PACKET - 2))
      SOF_Event_Buf[1] |= 0x02; /* EOF - End of Frame */
  }

  /* Copy data and send */
  Write_To_Buf();
  USB_WriteEP(0x83,(BYTE *)SOF_Event_Buf,Buf_Size);
}
#endif

0 goway xu over 15 years ago in reply to goway xu

Fixed but fail too.

#if USB_SOF_EVENT
void USB_SOF_Event (void)
{
  /* Payload header - SOF_Event_Buf[0~1] */
  if(JPG_Cnt == 0) /* Start of Frame */
  {
    SOF_Event_Buf[0]  = 0x02;
    SOF_Event_Buf[1] &= 0x01;
    SOF_Event_Buf[1] ^= 0x01; /* FID */
    SOF_Event_Buf[1] |= 0x80; /* EOH */
  }
  else
  {
    /* The last packet of jpg */
    if((JPG_size - JPG_Cnt) <= (EP3_MAX_PACKET - 2))
      SOF_Event_Buf[1] |= 0x02; /* EOF - End of Frame */
  }

  /* Copy data and send */
  Write_To_Buf();
  USB_WriteEP(0x83,(BYTE *)SOF_Event_Buf,Buf_Size);
}
#endif

0 goway xu over 15 years ago in reply to goway xu

Hi,Tsuneo

I modify the payload header,and it's work!

Thank you !

Xu
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