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Author Topic: Need help USB-SERIAL comm coding ccs PICC compiler.  (Read 3502 times)
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jaikumar
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« on: December 22, 2008, 01:48:18 13:48 »

Hi Need help with this,

Iam able to send bytes to PC, but this function '  usb_cdc_getc();' dosen't seem to return proper value
When i made an output of the data from usb_cdc_get() i only get 00 hex value.
COMPILER version 4.078

void main()
{
   BYTE i, j, address, val1;
   char value,val2;
   
   output_low(PIN_B0);
   output_low(PIN_B1);
   value = 'T';
   usb_cdc_init();
   usb_init();
   val2 = 'X';
  while(1)
   {
      usb_task();
      if (usb_enumerated())
     {
//         usb_cdc_putc(value);
         if (usb_cdc_kbhit() == TRUE)
         {
         val2 =  usb_cdc_getc();
         output_high(PIN_B0);
         }
         if (val2 == 'a') {output_high(PIN_B1);}
         if (val2 == 'b') {output_low(PIN_B1);}
      }
   
     }
}

Thanks,
Jai kumar
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kurian2z5
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« Reply #1 on: January 23, 2009, 06:33:48 06:33 »

Please show the rest of the program, the header file where the CDC parameters defined, etc. The virtual com port on your PC must be configured to the same parameters.
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Jagi
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« Reply #2 on: January 23, 2009, 03:29:53 15:29 »

Hi Need help with this,

Iam able to send bytes to PC, but this function '  usb_cdc_getc();' dosen't seem to return proper value
When i made an output of the data from usb_cdc_get() i only get 00 hex value.

Hey Jaikumar,
Just posting a part of the code does not help. You need to post the rest of the code, I would say at least please post the code for "usb_cdc_getc()" to help us help you. Hope this helps.
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viji
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« Reply #3 on: January 24, 2009, 12:31:29 00:31 »

Hi Jaikumar
 CCS has provided standard working examples Please try.
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jaikumar
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« Reply #4 on: January 24, 2009, 07:09:05 07:09 »

I would like to share to all who are using ccs framework/library for usb cdc. It does not work for 18f2450 looks like there is something wrong with the library file. There are a number of posts regarding this problem in
ccs forum.
You are better of using 18f2550 anyway because all the code works, and also it has more RAM. More RAM is required because the USB library itself takes a lot of space about 60% in ccs pcwhd 4.084 and  40% in ccs pcwhd 4.032
I wonder why. Anybody got any ideas please share.


Regards,
Jai
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