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USB_CDC enum

 
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Slim PICins



Joined: 03 Feb 2016
Posts: 2
Location: Nevada,USA

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USB_CDC enum
PostPosted: Thu Feb 04, 2016 10:29 am     Reply with quote
Compiler 4.128
PIC18F87J50

This code allows fairly reliable enumerations (USB To UART COM10) upon cable connection, as long as I have the "delay_ms(250)" line in. If I lower the delay or remove this line, I get "Device not Recognized" or "Device won't Start".

Any ideas? Thanks

Code:
void main()
{
   InitSystem();
   //setup_adc_ports(NO_ANALOGS);
   setup_timer_3(T3_DISABLED | T3_DIV_BY_1);
   setup_timer_4(T4_DISABLED,0,1);
   setup_comparator(NC_NC_NC_NC);
   
   // Use usb_init_cs()'connection sense' instead of usb_init()
   usb_init_cs(); //Original
   //usb_cdc_init();//Original
   
   
   do
   {
      if(usb_attached())
      {
         usb_task();
         delay_ms(250);
         if(usb_enumerated())
         {
            OUTPUT_HIGH(LED_PIN);
            if((usb_cdc_carrier.dte_present) && (bEnumeratedFlag == FALSE))
            {
               printf(usb_cdc_putc,"Hello, Universal Controller USB!\n\r");
               printf(usb_cdc_putc,"Enter ASCII command or '?'\n\r");
               bEnumeratedFlag = TRUE;
            }
            UsbReceiveTask();
         }
         else
         {
            OUTPUT_LOW(LED_PIN);
            usb_init_cs();
         }
      }
      else
      {  // The cable has been disconnected
         OUTPUT_LOW(LED_PIN);
         bEnumeratedFlag = FALSE;
         usb_cdc_init(); //clear buffers if disconnected
      }
           
   }while(TRUE);

}
Ttelmah



Joined: 11 Mar 2010
Posts: 19551

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PostPosted: Thu Feb 04, 2016 3:30 pm     Reply with quote
The problem is that you keep calling init_cs.

This only needs to be called once.

What is happening, is it sees the cable as attached, but it is not enumerated (yet). Your code then calls init_cs again, which resets the hardware, and prevents enumeration. So it keeps looping round not enumerating.
By adding the delay you give it time to enumerate....
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