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sprintf(); writing arrays with a2d

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newbieA2D
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sprintf(); writing arrays with a2d

Posted: Wed Dec 13, 2006 11:23 pm

I am trying to write an array based on light inputs. The code I was trying was this:

Code:

// fortest.c

#include <16F690.h>
#include <STDLIB>
#fuses INTRC_IO,NOWDT,NOPROTECT,NOMCLR,NOBROWNOUT,NOIESO,NOFCMEN //uses built-in clock only!
#use delay(clock=8000000)
#use RS232(Baud=9600,Xmit=PIN_B7) //PIN_B7 sends to LCD

#define LENGTH 6

void main(void){

delay_ms(3000); //wait for display to wake up
printf("?B7F"); //set contrast adaptor
delay_ms(2000); //wait for config to take hold
output_high(PIN_A2); // turn on the led
printf("?f"); //Home and clear the display.

setup_adc_ports(sAN1); //setup analog port
setup_adc(ADC_CLOCK_INTERNAL);

while(1){
char sig[LENGTH];
int i;
int light;

light = read_adc();

set_adc_channel(1);
printf("?f");
delay_ms(1000);
printf("?f");

for (i=0; i<5; i++){
printf("i = %u",i); //display the value of i
delay_ms(2000);
printf("?f");

if(light<120){
sig[i]= '1';

}
else{
sig[i]= '0';
}
}

printf("%s",sig);

delay_ms(2000);

}
}

and it did not seem to work. I was wondering if sprintf() should be used and could be used to write specific parts of the array. Any suggestions would be helpful.

PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Wed Dec 13, 2006 11:58 pm

Quote:

light = read_adc();

set_adc_channel(1);

Here, at least on the first pass, you're reading the A/D before you
set the channel. You should set the channel, delay for 20 us,
and then read the A/D.

Quote:

if(light<120){
sig[i]= '1';
}
else{
sig[i]= '0';
}
}
printf("%s",sig);

In the code above, you're trying to build a string which consists of
ascii 1's and 0's. But it's not a string until you write a string terminator
byte of zero at the end of the ascii digits. After you've finished filling
the array, you need to write 0x00 in the next available location.

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