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Problem with USB

 
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JohnLook
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Problem with USB
PostPosted: Thu Nov 16, 2006 4:23 pm     Reply with quote
Hi, I'm having a problem when I connect the board with PIC18F4550 on USB port. I would like to know why when I connect the cable there isn't no power and windows shows a message of error indicating that the device wasn't recognized.
TARUN GUPTA



Joined: 20 Nov 2006
Posts: 2
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first time i have written code for USB
PostPosted: Tue Nov 21, 2006 12:15 am     Reply with quote
hi, i have written time code for USB in 16c745(OTP) using example from ccs c compiler , but i m not 100% sure it works, and i have programmer which burn code in this 16c745/765 family chip. I cant programme the 18f4550 due to probem of programmer....so help me ,how i can write code in ccs c compiler Sad
_________________
hi.....
i wud join this for getting knowledge and for discusssion
TARUN GUPTA



Joined: 20 Nov 2006
Posts: 2
Location: mumbai

View user's profile Send private message Yahoo Messenger ICQ Number

first time i have written code for USB
PostPosted: Tue Nov 21, 2006 12:17 am     Reply with quote
hi, i have written time code for USB in 16c745(OTP) using example from ccs c compiler , but i m not 100% sure it works, and i have programmer which burn code in this 16c745/765 family chip. I cant programme the 18f4550 due to probem of programmer....so help me ,how i can write code in ccs c compiler Sad
Code:


this programm for testing ...just switch i connected to microcontroller abd transmitting particular data through usb to computer.......

#define USB_PIC16C745 1 //set to 1 to use a PIC16c765 USB Peripheral
                        //set to 0 to use a National USBN960x peripheral

#include <16C745.h>

#device *=16

#fuses HS,NOWDT,NOPROTECT

#use delay(clock=24000000)

#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)



#DEFINE LED_4   PIN_B1      //SENSOR STATUS

#define SENSOR  PIN_B2     // IR SENSOR...

#DEFINE LED_3   PIN_B3      // led connected on pin b3 for initial status & button2

#DEFINE LED_2   PIN_B4      // led connected on pin b4 for initial status & button1

#DEFINE LED_1   PIN_B5      // led connected on pin b5

#DEFINE BUTTON1 PIN_B6     // switch connected to pin a4

#DEFINE BUTTON2 PIN_B7     // switch connected to pin a5

#byte port_b=6


//Tells the CCS PIC USB firmware to include HID handling code.

#DEFINE USB_HID_DEVICE  TRUE




//Set this to FALSE if you only want to test enumeration.  Some USB test programs,

//such as USBCHECK, crash if you are trying to test enumeration and the device

//starts sending data once configured.

#DEFINE USB_RUN_WHEN_CONFIGURED  TRUE





//the following defines needed for the CCS USB PIC driver to enable the TX endpoint 1

#define USB_EP1_TX_ENABLE  1   //turn on EP1 for IN bulk/interrupt transfers

#define USB_EP1_TX_SIZE    2   //if you change this, be sure to change the hid descriptor




//the following defines needed for the CCS USB PIC driver to enable the RX endpoint 1

#define USB_EP1_RX_ENABLE  1   //turn on EP1 for OUT bulk/interrupt transfers

#define USB_EP1_RX_SIZE    2   //if you change this, be sure to change the hid descriptor





#if USB_PIC16C745

   #include <pic_usb.h>   //Microchip PIC16C765 hardware layer for usb.c

#else

   #include <usbn960x.c>   //National 960x hardware layer for usb.c

#endif






#include <usb.c>        //handles usb setup tokens and get descriptor reports








//////////////////////////// MAIN PROGRAM //////////////////////////////////////



void main() {

   int8 out_data[USB_EP1_TX_SIZE];

   int8 in_data[USB_EP1_RX_SIZE];

   int8  out1;

   output_b(0xff);

   set_tris_b(0x23);


#ifdef __PCH__

   printf("\r\n\r\nPCH: v");

   printf(__PCH__);

#else

   printf("\r\n\r\nPCM: v");

   printf(__PCM__);

#endif




//   setup_adc(ADC_CLOCK_INTERNAL);

//   setup_adc_ports(RA0_RA1_RA3_ANALOG);

//   set_adc_channel(1);




   usb_init();   // usb initialise function

#if !(USB_PIC16C745)

   printf("\r\nUSBN: 0x%X\r\n", usbn_get_version());

   bit_clear(port_b, LED_1);

   bit_clear(port_b, LED_2);

   bit_clear(port_b, LED_3);

   delay_ms(1000);

   bit_set(port_b, LED_1);

   bit_set(port_b, LED_2);

#else

   printf("\r\n");

#ENDIF

   printf("\r\n\r\nWaiting for enumeration...");

   while (TRUE) {

         usb_wait_for_enumeration();

         printf("\r\n\r\n***Enumerated***\r\n");

         while(usb_enumerated()) {

         #IF USB_RUN_WHEN_CONFIGURED

            if (usb_kbhit(1)) {

               usb_gets(1, in_data, USB_EP1_RX_SIZE);

               printf("\r\n--> Received 2 bytes: 0x%X 0x%X",in_data[0],in_data[1]);

               if (in_data[0]) {bit_clear(port_b, LED_1);} else {bit_set(port_b, LED_1);}

               if (in_data[1]) {bit_clear(port_b, LED_2);} else {bit_set(port_b, LED_2);}

            }

            if (PIN_B2==1){

                 out1 = 1 ;
                 bit_set(port_b, LED_4);
                 delay_ms(5);
            }

            else
            {
               out1 = 0 ;
               bit_clear(port_b, LED_4);
               delay_ms(5);
            }


            out_data[0] = out1;




            if (BUTTON1==0 && BUTTON2==0)
               {
                  out_data[1]=2;
                  bit_clear(port_b, LED_2);
                  bit_clear(port_b, LED_3);
                  delay_ms(5);
               }

            if (BUTTON1==0 && BUTTON2==1)
               {
                  out_data[1]=3;
                  bit_clear(port_b, LED_2);
                  bit_set(port_b, LED_3);
                  delay_ms(5);
               }

            if (BUTTON1==1 && BUTTON2==0)
               {
                  out_data[1]=4;
                  bit_set(port_b, LED_2);
                  bit_clear(port_b, LED_3);
                  delay_ms(5);
               }

            if (BUTTON1==1 && BUTTON2==1)
               {
                  out_data[1]=5;
                  bit_set(port_b, LED_2);
                  bit_set(port_b, LED_3);
                  delay_ms(5);
               }


            if (usb_put_packet(1, out_data, USB_EP1_TX_SIZE, TOGGLE)) {

                 printf("\r\n<-- Sending 2 bytes: 0x%X 0x%X", out_data[0], out_data[1]);

            }

            delay_ms(500);

         #ENDIF

         }

         printf("\r\n\r\nDevice Un-configured.r\n");

   }

}

_________________
hi.....
i wud join this for getting knowledge and for discusssion
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Nov 21, 2006 12:57 am     Reply with quote
Quote:

bit_clear(port_b, LED_1);
bit_clear(port_b, LED_2);
bit_clear(port_b, LED_3);

bit_set(port_b, LED_1);
bit_set(port_b, LED_2);

The statements above are incorrect and will not generate any code.
Change them to this:
Code:

output_low(LED_1);
output_low(LED_2);
output_low(LED_3);

output_high(LED_1);
output_high(LED_2);

There are at least 10 more lines in your program that are similar,
and they should be fixed in the same way.


Quote:
if (BUTTON1==0 && BUTTON2==0)

The statement above is incorrect. Change it to this:
Code:
if (input(BUTTON1)==0 && input(BUTTON2)==0)

There are many similar lines in your program. They must all be
fixed in the same way.
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