cleanup: makefile, hbc and removed unused files

[lra-as-sensor] / hbc.c

diff --git a/hbc.c b/hbc.c
index c5749cc..30a1769 100644 (file)
--- a/hbc.c
+++ b/hbc.c
@@ -1,25 +1,28 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <stdbool.h>
 #include <avr/io.h>
 #include <avr/wdt.h>
 #include <avr/sleep.h>
 #include <avr/power.h>
 #include <avr/interrupt.h>
 #include <util/delay.h>
-#include "haptic.h"
-
-/* idle mode will wake up board and will
- * return PC after latest sleep_mode() call */
-EMPTY_INTERRUPT(SIG_COMPARATOR);
-
-/* for debugging purposes */
-ISR(BADISR_vect) 
+       
+ISR(SIG_COMPARATOR)
 {
+       if (ACSR & (1 << ACO)) {
+               PORTB |= (1 << PB4);
+               /* turn of comparator on detection */
+               ACSR &= ~(1 << ACIE);
+       } else {
+               PORTB &= ~(1 << PB4);
+       }
 }
 
+EMPTY_INTERRUPT(TIM0_COMPA_vect);
+
 static void switch_idle(void)
 {
-       sei();
        set_sleep_mode(SLEEP_MODE_IDLE);
        sleep_mode();
 }
@@ -28,29 +31,51 @@ static void init_board(void)
 {
        power_adc_disable();
        wdt_disable();
+}
+
+static void set_ref_voltage(void)
+{
+       DDRB |= (1 << DDB1); /* set PB0 as output */
+       TCCR0A = TCCR0B = 0;
+       TCCR0A |= (1 << WGM01) | (1 << WGM00) | (1 << COM0B1);
+       TCCR0B |= (1 << CS00); /* clk/1024 prescaler */
+       OCR0B = 0x20; /* 25% duty cycle */
+       TCNT0 = 0;
+       TIMSK = (1 << OCIE0B); /* enable interrupts for overflow and compare */
+}
+
+static void config_comparator(void)
+{
+       ADCSRA = 0;
+       ADCSRB |= (1 << ACME); /* multiplex enable */
+       
+       /* Use admux to set alternative negative pin */
+       //ADMUX |= (1 << MUX0);
+       
        /* enable interal reference for 
         * comparator 
         * When the bandgap reference is connected to the Analog Comparator (by setting the ACBG bit in ACSR). */
+       ACSR &= ~(1 << ACD); /* enable comparator */
+       ACSR |= (1 << ACBG);
+
+       DIDR0 |= (1 << AIN1D) | (1 << AIN0D);
+
+       ACSR |= (1 << ACIE); /* enable interrupts */
 }
 
 int main(void)
 {
-       
-       init_board();   
-
-       while(1) {
+       init_board();
 
-               /* set LRA as sensor and switch to idle mode
-                * check back-EMF of LRA: if treshold is surpassed
-                * comparator intterupt is triggered */
-               set_lra_as_sensor();
-               switch_idle(); 
+       DDRB |= (1 << DDB4);
 
-               /* board wakes up, set LRA as actuator and
-                * plays haptic effect */
-               set_lra_as_actuator();
-               play_haptic();
+       cli();
+       config_comparator();
+       sei();
+       switch_idle();
 
+       while(1) {
+               _delay_ms(100);
        }
 
 }