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mworks
Joined: 29 May 2007
Posts: 3
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| Need help with arrays |
 Posted: Tue May 29, 2007 7:57 pm |
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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);
}
}
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue May 29, 2007 11:18 pm |
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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 ? |
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inservi
Joined: 13 May 2007
Posts: 128
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| Posted: Wed May 30, 2007 1:37 am |
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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 |
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mworks
Joined: 29 May 2007
Posts: 3
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| Posted: Wed May 30, 2007 7:36 am |
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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.  |
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