I have used the code given in USB-MSD-reference design, in my code. The system works well. In working mode it stores some sensor data in a notepad file in a SD card, when connecting with the PC via USB cable we can get the notepad file to the PC.

Now I have to integrate a RF unit with the system. The code I developed for the RF section works well seperately. But when I integrate all the codes, I found the RF section does not wrok. Then later I found that one of the 'USB_MSD_SD card' initialising function 'Sect_Init()' causes the problem. If I comment this function call the RF section works. But USB-MSD function will not work obviously.
(The 'Sect_init()' will intrun calls the function 'MMC_FLASH_Init()').

I am using PORT2 and Port3.3 for RF section interfacing. I can't figure out any relation this two section ( RF & USB-SD card) of the code. Can anyone tell me what could be the problem?

thanks
Shyam

[This message has been edited by Shyam (edited July 31, 2010).]

If anyone of you give me a small clue it will be very helpful.

F34x_MSD_MMC.c (in AN282SW.zip) touches to Port2 everywhere. MMC_FLASH_Init(), too.
It flashes LEDs on Port2 to show activity. If you would delete the LED code, there is no problem for MMC function.

sbit Led1 = P2^2;
sbit Led2 = P2^3;
#define MMC_Show_Activity() { if(Led1) { Led1=0;Led2=1;} else { Led1=1;Led2=0; } }
void MMC_FLASH_Init(void)
{
  ...
  ...
  Led1=0;Led2=0;
}
unsigned int MMC_FLASH_Block_Read(unsigned long address, unsigned char *pchar)
{
  ...
  Led1=1;
  ...
  ...
  Led1=0;
  return card_status;
}
unsigned char MMC_FLASH_Block_Write(unsigned long address,unsigned char *wdata)
{
  ...
  Led2=1;
  ...
  ...
  Led2=0;
  return card_status;
}

Tsuneo