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zonemikel
Joined: 13 Oct 2007
Posts: 53
Location: Texas
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| 12F675 Simple Adc to rs232 and I'm getting "out of ROM |
 Posted: Thu Apr 02, 2009 9:50 pm |
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Hello everyone,
Haven't been here in a while. I've been looking through the boards but have not found anything. This is a weird error, my code is so small.
Im getting the error "out of ROM, A segment or the program is too large"
When i comment out the " printf("%f",total); " it works fine.
this is my .c I tried to reduce it as much as possible
| Code: | #include "C:\Program Files (x86)\PICC\Drivers\12f675test.h"
#include <float.h>
//#include <math.h>
#include <stdio.h>
//#include <string.h>
// adc variables
int i =0;
int adc_value;
float volts;
//float diff = 30.4; // scale it down ?
float total = 0;
//float temp = 0; // chop off the .xx
void main()
{
setup_adc_ports(sAN0|VSS_VDD);
setup_adc(ADC_CLOCK_DIV_8);
set_adc_channel(0);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_DISABLED);
setup_comparator(NC_NC_NC_NC);
setup_vref(FALSE);
while(1){
//temp=0;
total = 0;
for (i=0; i<20; i++)
{
adc_value = read_adc();
total += (float)(adc_value * 5)/255;
delay_us(100);
}
total = ((total/20)*100);
delay_ms(500);
printf("%f",total);
}
} |
my .h file
| Code: | #include <12F675.h>
#device adc=8
#use delay(clock=20000000)
#fuses NOWDT,HS, NOCPD, NOPROTECT, MCLR, NOPUT, BROWNOUT
#use rs232(baud=9600,parity=N,xmit=PIN_A2,bits=8) |
Im just transmitting a analogue value on pin a0 to the computer using rs232, all thats working fine, just dont know what this error means. Anyway thats why there is no receive pin setup.
thanks for reading this, and thanks for your time.
_________________
Smart people know how stupid they are. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Thu Apr 02, 2009 10:13 pm |
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Commenting out the printf statement allows it to compile.
Your existing code without the printf, uses up almost all of the PIC (88%).
This PIC only has 1024 ROM words. This PIC is really too small to
use floating point, except in a limited way.
| Quote: | CCS PCM C Compiler, Version 4.090, xxxxx 02-Apr-09 20:59
Filename: 12F675_Test.lst
ROM used: 897 words (88%)
Largest free fragment is 127
RAM used: 19 (30%) at main() level
33 (52%) worst case
Stack: 1 locations |
If you must use an 8-pin 12F PIC, I suggest that you use the 12F683.
It has 2048 ROM words available and it has an A/D converter. |
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zonemikel
Joined: 13 Oct 2007
Posts: 53
Location: Texas
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| Posted: Fri Apr 03, 2009 1:24 pm |
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Thanks, I'll be sure to look at that summary from now on when i compile. I do have a 12f683 laying around I might use that or just send the adc_value directly to the computer and let it do the averaging.
thanks again for your time.
_________________
Smart people know how stupid they are. |
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