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IF statment
PostPosted: Thu Nov 04, 2004 3:40 am     Reply with quote
Hi,
I am a new one to use CCS C compiler. I am using 16F73 with CCS PCM 3.211 Compiler. I have some problem with my code. I want to get the atan value from two inputs AN0 and AN1, then output PWM in ccp1. Is there someone can help me?
the code is following:
Code:


#include <16F73.h>
#include <math.h>
#device adc=8
#use delay(clock=2000000)
#fuses NOWDT,XS, NOPUT, NOPROTECT, BROWNOUT

void main() {
   float valueX, valueY, data, angle;
   setup_adc_ports(AN0_AN1_AN3);
   setup_adc(ADC_CLOCK_INTERNAL);
   setup_spi(FALSE);
   setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
   setup_timer_1(T1_DISABLED);
   setup_timer_2(T2_DIV_BY_1,255,1);
   setup_ccp1(CCP_PWM);
   setup_ccp2(CCP_PWM);
   while(true){
      set_adc_channel(0);
      delay_us(10);
      valueX = read_adc();

      set_adc_channel(1);
      delay_us(10);
      valueY = read_adc();
      valueX = (valueX - 128) / 128;
      valueY = (valueY - 128) / 128;
      data = valueY / valueX;
     
      if(valueX > 0){
         if(valueY > 0)
            angle = atan(data);
         else
            angle = 6.2831853 + atan(data);
      }
      else{
         angle = 3.14159265 + atan(data);
      }
     
      angle = angle * 1024 / (2.0 * PI);
      set_pwm1_duty((long int) angle);
   }
}

drh



Joined: 12 Jul 2004
Posts: 192
Location: Hemet, California USA

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PostPosted: Thu Nov 04, 2004 8:36 am     Reply with quote
A couple of suggestions:

Enable PUT in your #fuses statement.

Cast your adc value to a float.
i.e. valueX = (float)read_adc();
_________________
David
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