Help needed with USB interfacing for PIC18F4550

[maniyuri]

Hi all,

I have tried using the USB example code from the library of MikroC with PIC18F4550 but it is not working. It gives an error :Main function not defined.

unsigned char readbuff[64] absolute 0x500;   // Buffers should be in USB RAM, please consult datasheet
unsigned char writebuff[64] absolute 0x540;

char cnt;
char kk;

void interrupt(){
   USB_Interrupt_Proc();                   // USB servicing is done inside the interrupt
}

void main(void){
  ADCON1 |= 0x0F;                         // Configure all ports with analog function as digital
  CMCON  |= 7;                            // Disable comparators

  HID_Enable(&readbuff,&writebuff);       // Enable HID communication

  while(1){
    while(!HID_Read())
      ;

    for(cnt=0;cnt<64;cnt++)
      writebuff[cnt]=readbuff[cnt];

    while(!HID_Write(&writebuff,64))
      ;
  }
}

Please help me out. I am totally new to USB interfacing. If there is some material that you could refer, it would be of great help.

I also had some other doubts. What is the value in front of the first two lines (absolute 0x500, absolute 0x540). Any help will be greatly appreciated.

Regards.

 

[bugme]

an error :Main function not defined.

Looks to me like your "main" should be called "Main"

unsigned char readbuff[64] absolute 0x500; // Buffers should be in USB RAM, please consult datasheet
unsigned char writebuff[64] absolute 0x540;

absolute address is to force where processor puts the array--at absolute addr 0x500 in usb memory

 

[nigelwright7557]

Look here:
Building a PIC18F USB device - WFFwiki

 

[Easyrider83]

Your project must include C file with main routine.