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Need help with arrays

 
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mworks



Joined: 29 May 2007
Posts: 3

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Need help with arrays
PostPosted: Tue May 29, 2007 7:57 pm     Reply with quote
I'm trying to write a program that will send out a stream of pulses based on values stored in an array. The lines at the very end are so I can distinguish the pulse start/end on a logic analyzer.

I tried to write it using the array values directly like if the array contained the value I[5] = 300, the I would use delay_ms(I[5]);

However that refused to work, the pic seemed to ignore it and use a value of 20us for the pulse.

so I wrote the code below.
It works except that if I change the line:
While(z!=14) to read While(z!=15) the program ceases to work.

It seems if I try to access anything above 14 in the array the program fails to run.

I'm using tiny bootloader , could this be the problem ?
I'm new at this so any pointers are very welcome.



Code:

#include <16F88.h>
#device adc=8
#build( reset=0x1, interrupt=0x5)
#ORG 0x0F00, 0x0FFF {}
#FUSES NOWDT                    //No Watch Dog Timer
#FUSES HS                       //High speed Osc (> 4mhz)
#FUSES NOPUT                    //No Power Up Timer
#FUSES NOMCLR                   //Master Clear pin used for I/O
#FUSES NOBROWNOUT               //No brownout reset
#FUSES NOLVP                    //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#FUSES NOCPD                    //No EE protection
#FUSES NOWRT                    //Program memory not write protected
#FUSES NODEBUG                  //No Debug mode for ICD
#FUSES NOPROTECT                //Code not protected from reading
#FUSES NOFCMEN                  //Fail-safe clock monitor disabled
#FUSES NOIESO                   //Internal External Switch Over mode disabled

#use delay(clock=20000000)
#use rs232(baud=9600,parity=N,xmit=PIN_A3,rcv=PIN_A2,bits=8)

void main()
{

int y;
int z=0;
int dly[17] = {1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,3,3};

      while(TRUE)
      {
     
      While(z!=14)
         {
      y=dly[z];
      output_low(PIN_B0);
      If (y==1)
      {
      delay_us(585);
      }
      If (y==2)
      {
      delay_us(444);
      }
      If (y==3)
      {
      delay_ms(1.5);
      }
      z=z+1;
      y=dly[z];
      output_high(PIN_B0);
      If (y==1)
      {
      delay_us(585);
      }
      If (y==2)
      {
      delay_us(444);
      }
      If (y==3)
      {
      delay_ms(1.5);
      }
      z=z+1;
         }
      z=0;
      output_low(PIN_B0);
      delay_us(50);
      output_high(PIN_B0);
      delay_us(50);
     
      }
}


PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue May 29, 2007 11:18 pm     Reply with quote
Quote:
delay_ms(1.5);

Download the latest compiler manual.
http://www.ccsinfo.com/downloads/ccs_c_manual.pdf
Read the section on how to use the delay_ms() function. What does
it say about the parameter that may be passed to the function ?
inservi



Joined: 13 May 2007
Posts: 128

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PostPosted: Wed May 30, 2007 1:37 am     Reply with quote
Hello,

int dly[17] create a 17 element array. subscript are from 0 to 16.

While(z!=14)
..
z=z+1 ( now z=15 )
..
z=z+1 ( now z=16)
..

If you start with 15 at the second z++, dly[z]; point to an unknown value probably not 1,2 or 3 then the last pulse is very short.

If the version CCS version 4 is not solving your problem, make a function
witch receive an argument and make the calculated number of delay_ necessary.

dro
_________________
in médio virtus
mworks



Joined: 29 May 2007
Posts: 3

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PostPosted: Wed May 30, 2007 7:36 am     Reply with quote
PCM programmer wrote:
Quote:
delay_ms(1.5);

Download the latest compiler manual.
http://www.ccsinfo.com/downloads/ccs_c_manual.pdf
Read the section on how to use the delay_ms() function. What does
it say about the parameter that may be passed to the function ?


Thanks for pointing that out.
That was the problem.
I'm trying to learn C and Pics in general at the same time and while its fun , its also trying at times. Laughing
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