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Viewing changes to touch/adc_sampling.c

  • Committer: Robert Kosara
  • Date: 2008-08-19 02:35:28 UTC
  • Revision ID: robert@eagereyes.org-20080819023528-qr55ocd9hua14eq2
Initial import.

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touch/adc_sampling.c
 
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#ifdef __cplusplus
 
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extern "C"{
 
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#endif
 
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#include <avr/io.h>
 
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#include <stdlib.h>
 
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#include <avr/interrupt.h>
 
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#include "bitops.h"
 
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#include "touchscreen.h"
 
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#include "adc_sampling.h"
 
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#include "usart.h"
 
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volatile unsigned char adcCurrChan=0;
 
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volatile unsigned char adc_delay=0;
 
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////////////////////////////////////////////////
 
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//This is our 128uS time base from timer 0
 
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//
 
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////////////////////////////////////////////////
 
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SIGNAL (SIG_OVERFLOW0) //every 128us
 
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{
 
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if (adc_delay == ADC_DELAY_MAX)
 
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        {
 
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        adc_delay = 0; //reset the counter
 
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        adcCurrChan++; //next channel
 
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        if (adcCurrChan == ADC_TOTAL_CHANNELS) 
 
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                adcCurrChan = 0; //loop back around to the first channel
 
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        switch(adcCurrChan)
 
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                {
 
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                case ADC_CHAN0:
 
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                //Touchscreen: XPLUS
 
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                touchscreen_setup_x();
 
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                SETBIT(ADCSRA,ADSC); //start conversion!
 
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                break;
 
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                case ADC_CHAN1:
 
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                //Touchscreen: YMINUS
 
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                touchscreen_setup_y();
 
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                SETBIT(ADCSRA,ADSC); //start conversion!
 
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                break;
 
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                }//end switch
 
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        }
 
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else
 
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        {
 
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        adc_delay++; //increment the counter
 
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        }
 
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} //end interrupt
 
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////////////////////////////////////////////////
 
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//ADC sample complete!
 
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/////////////////////////////////////////////////
 
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SIGNAL (SIG_ADC) 
 
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{
 
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        switch(adcCurrChan)
 
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                {
 
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                case ADC_CHAN0:
 
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                touchscreen_process_x(ADCH); 
 
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                break;
 
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                case ADC_CHAN1:
 
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                touchscreen_process_y(ADCH);
 
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                break;
 
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                }
 
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}
 
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#ifdef __cplusplus
 
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} // extern "C"
 
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#endif
 
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