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USB to USART

 
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joven



Joined: 30 Jan 2007
Posts: 56
Location: Viana do Castelo - Portugal

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USB to USART
PostPosted: Tue Nov 13, 2007 5:05 pm     Reply with quote
Hi

I'm trying use the ex_usb_serial.c but isn't working.
someone have successfully put working?

in my program i'm using the usb bootloader to try more fast the changes.

Code:

#include <18F2550.h>

#fuses HSPLL,NOWDT,NOPROTECT,NOLVP,NODEBUG,USBDIV,PLL5,CPUDIV1,VREGEN,NOPBADEN,WRTB,MCLR,NOCPD,NOWRTC
#use delay(clock=48000000)

// START OF bootloader definition
#define LOADER_END   0x7FF
#define LOADER_SIZE   0x6FF
#build(reset=LOADER_END+1, interrupt=LOADER_END+9)
#org 0, LOADER_END {} // nothing will replace the bootloader memory space
// END OF bootloader definition

#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8)
#include <usb_cdc.h>

// Configure the demonstration I/O
#DEFINE LED1 PIN_B7
#define LED2 PIN_B6
#define LED3 PIN_B5
#DEFINE BUTTON PIN_B4
#define LED_ON output_low
#define LED_OFF output_high

/////////////////////////////////////////////////////////////////////////////
//
// usb_debug_task()
//
// When called periodically, displays debugging information over serial
// to display enumeration and connection states.  Also lights LED1 based upon
// enumeration and status.
//
/////////////////////////////////////////////////////////////////////////////
void usb_debug_task(void) {
   static int8 last_connected;
   static int8 last_enumerated;
   int8 new_connected;
   int8 new_enumerated;
   static int8 last_cdc;
   int8 new_cdc;

   new_connected=usb_attached();
   new_enumerated=usb_enumerated();
   new_cdc=usb_cdc_connected();

   if (new_enumerated)
      LED_ON(LED1);
   else
      LED_OFF(LED1);

   if (new_cdc)
      LED_ON(LED2);
   else
      LED_OFF(LED2);

   if (usb_cdc_carrier.dte_present)
      LED_ON(LED3);
   else
      LED_OFF(LED3);

   if (new_connected && !last_connected)
      printf("USB connected, waiting for enumaration...\r\n\n");
   if (!new_connected && last_connected)
      printf("USB disconnected, waiting for connection...\r\n\n");
   if (new_enumerated && !last_enumerated)
      printf("USB enumerated by PC/HOST\r\n\n");
   if (!new_enumerated && last_enumerated)
      printf("USB unenumerated by PC/HOST, waiting for enumeration...\r\n\n");
   if (new_cdc && !last_cdc) {
      printf("Serial program initiated on USB<->UART COM Port\r\n\n");
      printf(usb_cdc_putc, "\r\n\nCCS CDC (Virtual RS232) Example\r\n\n");
   }

   last_connected=new_connected;
   last_enumerated=new_enumerated;
   last_cdc=new_cdc;
}

void main(void) {
   char c;

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

   printf("\r\n\nCCS CDC (Virtual RS232) Example\r\n");

  #ifdef __PCH__
   printf("PCH: v");
   printf(__PCH__);
  #endif
   printf("\r\n");

   usb_init_cs();


   while (TRUE)
   {
      usb_task();
      usb_debug_task();

      if (kbhit())
      {
         c=getc();
         if (c=='\n') {usb_cdc_putc('\r'); usb_cdc_putc('\n');}
         if (c=='\r') {usb_cdc_putc('\r'); usb_cdc_putc('\n');}
         else {usb_cdc_putc(c);}
      }
      if (usb_cdc_kbhit())
      {
         c=usb_cdc_getc();
         if (c=='\n') {putc('\r'); putc('\n');}
         if (c=='\r') {putc('\r'); putc('\n');}
         else {putc(c);}
      }
   }
}


Someone can give-me a tip for put working?

thanks
meereck



Joined: 09 Nov 2006
Posts: 173

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PostPosted: Wed Nov 14, 2007 7:24 am     Reply with quote
As I can see, you use the USB bootloader.
What is the crystal you have on your board? It looks like 20Mhz.
Is the device enumerated?
joven



Joined: 30 Jan 2007
Posts: 56
Location: Viana do Castelo - Portugal

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PostPosted: Wed Nov 14, 2007 2:45 pm     Reply with quote
hi

what you mean device enumerated?

i think include the "#define __USB_PIC_PERIF__ 1"
meereck



Joined: 09 Nov 2006
Posts: 173

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PostPosted: Wed Nov 14, 2007 3:43 pm     Reply with quote
I mean what happens when the PIC gets connected to a PC? Any message from the PC?

"
//set to 1 to use a PIC's internal USB Peripheral
//set to 0 to use a National USBN960x peripheral
#define __USB_PIC_PERIF__ 1
"
In the case you use a PIC with USB controller integrated, set it to 1.
Do you have a cap about 470nF on Vusb pin of the PIC?
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