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problem when combine node B with 7 segment at node D

 
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shapito



Joined: 21 Feb 2012
Posts: 9

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problem when combine node B with 7 segment at node D
PostPosted: Tue Apr 10, 2012 11:40 am     Reply with quote
I use CCS CAN Bus Prototype Board.
Node B use PIC16F876A. This is my coding:
Code:

#include <16F876A.h>
#device ICD=TRUE
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#include <can-18xxx8.c>

#define WRITE_REGISTER_D_ID 0x400

void write_7_segment(int value){
   const int lcd_seg[10]={ 0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10};
   int buffer[3];
   
   buffer[0]=0x1E;
   buffer[1]=0x7F;
   buffer[2]=lcd_seg[value];
   can_putd(WRITE_REGISTER_D_ID,BUFFER, 3,1,TRUE,FALSE);
}

void main(){
   int i=0;
   
   can_init();
   can_putd(0x100,0,0,1,TRUE,FALSE);//send an on-bus message
                                    //to wake up ms\cp250x0's
                                    //wait for node c to power up
   
   delay_ms(1000);
   
   while (TRUE) {
      write_7_segment(i);
      delay_ms(1000);
      if(++i==10)
         i=0;
     
      }

  }

When I build all and compile, there is no error. But when I burn it to node B, nothing happened. Can somebody help me?
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Apr 10, 2012 12:17 pm     Reply with quote
CCS provides example files for that board. I think we told you this before.
Use their example for Node B:
Quote:

c:\program files\picc\examples\ex_can_ccs_b.c

Compare the CCS file to your code. You will see that you have done
many things incorrectly. The main thing to understand is that the
16F876A is connected to an external CAN bus controller, which is the
MCP2510. The 16F876A also gets it's oscillator input from the MCP2510.
You can't just arbitrarily edit the #use delay() and change it to whatever
you want. It won't work.

Look at the CCS example file. It shows how to do it.
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