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help required in usb to serial converter 18f4550

 
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zeeshan ahmed



Joined: 02 Dec 2010
Posts: 22

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help required in usb to serial converter 18f4550
PostPosted: Tue Feb 08, 2011 12:58 am     Reply with quote
Hi all, I'm new to ccs. I need help regarding USB to UART converter. I'm using pic18f4550 usb microcontroller. I setup my controller as CDC usb Device. Have a look at my simple code.
For testing purpose I am just sending characters to see what happens.
Code:

#include <18F4550.h>
#fuses HSPLL,NOWDT,NOPROTECT,NOLVP,NODEBUG,USBDIV,PLL5,CPUDIV1,VREGEN
#use delay(clock=48000000)
#use rs232(baud=38400,xmit=PIN_C6, rcv=PIN_C7 )

#include <usb_cdc.h>

#define LED1 PIN_A5
#define LED2 PIN_B4
#define LED3 PIN_B5
#define LED_ON(x) output_high(x)
#define LED_OFF(x) output_low(x)
#define PBTN() !input(PIN_D6)

void main(void)
{
   char c;

   LED_OFF(LED1);
   LED_OFF(LED2);
   LED_OFF(LED3);

   usb_init();

 
   while (TRUE)
   {
      usb_task();
       if (kbhit())
      {
         c=getc();
         usb_cdc_putc(c);
      }
      if (usb_cdc_kbhit())
      {
         c=usb_cdc_getc();
         putc(c);
      }
   }
}

Actually it works fine but when I input plenty of characters (data) my PC hangs up. Confused

Please help ASAP.
Thanks in Advance
andrewg



Joined: 17 Aug 2005
Posts: 316
Location: Perth, Western Australia

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PostPosted: Tue Feb 08, 2011 9:46 am     Reply with quote
I'd say you're overflowing the PIC UART and it's locked up. Always add ERRORS to #use rs232!

I would also use interrupt-driven serial routines. See EX_SISR.C and EX_STISR.C in the CCS examples.
_________________
Andrew
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