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CCS CDC ehco problem

 
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Markdem



Joined: 24 Jun 2005
Posts: 206

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CCS CDC ehco problem
PostPosted: Fri Sep 01, 2006 10:26 pm     Reply with quote
Hello, all. I have got one of my devices working with the CDC driver. The problem in that when i type somthing onto hyperterminal, the pic will ehco each keystoke back. This is not the local echo option because if i enable that option in hyperterminal, i will get two sets of echo eg 220000 when i type 200.

Can anyone help me here??

Thanks, Mark

Code:

include <18F4550.h>

#fuses HSPLL,NOWDT,NOPROTECT,NOLVP,NODEBUG,USBDIV,PLL5,CPUDIV1,VREGEN,NOBROWNOUT
#use delay(clock=48000000)

#define USB_CON_SENSE_PIN PIN_A3

#include <usb_cdc.h>

int USB_req;


void main(void)
   {
      usb_init();

      while (TRUE)
         {
            if (usb_cdc_kbhit())                           
               {
                  USB_req = get_int_usb();
                  if (USB_req == 201)                  
                     {
                        printf(usb_cdc_putc,"ok\n");
                     }
                  else
                     {
                        printf(usb_cdc_putc,"200\n");
                     }   
               }   
         }
   }

PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Fri Sep 01, 2006 11:24 pm     Reply with quote
Find the function get_int_usb() shown in bold below, inside the
usb_cdc.h file. Look at its code. It calls the get_string_usb() function.
What lines of code in get_string_usb() could cause your problem ?

Quote:

if (usb_cdc_kbhit())
{
USB_req = get_int_usb();
if (USB_req == 201)
{
printf(usb_cdc_putc,"ok\n");
}
else
{
printf(usb_cdc_putc,"200\n");
}
}
}
Markdem



Joined: 24 Jun 2005
Posts: 206

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PostPosted: Sat Sep 02, 2006 12:56 am     Reply with quote
Thank you PCM, i dont know how i missed that.

Thanks, Mark
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