hbc: timer with compare match output

[lra-as-sensor] / hbc.c

diff --git a/hbc.c b/hbc.c
index 157d617..5ff04c7 100644 (file)
--- a/hbc.c
+++ b/hbc.c
@@ -1,21 +1,77 @@
+#include <stdio.h>
+#include <stdlib.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"
+       
+volatile int xvar = 1;
 
-#include <stdio.h>
-#include <stdlib.h>
+/* idle mode will wake up board and will
+ * return PC after latest sleep_mode() call */
+EMPTY_INTERRUPT(SIG_COMPARATOR);
 
-#include <util/delay.h>
+ISR(TIM0_COMPA_vect)
+{      
+       xvar++;
+}
+ISR(TIM0_COMPB_vect)
+{
+       xvar++;
+}
 
-int main(void) {
-       
-       
-       DDRB |= (1 << DDB3);
-       PORTB = (1 << PB3);
+ISR(TIM0_OVF_vect)
+{
+       //xvar++;
+}
+
+
+static void switch_idle(void)
+{
+       sei();
+       set_sleep_mode(SLEEP_MODE_IDLE);
+       sleep_mode();
+}
+
+static void init_board(void)
+{
+       power_adc_disable();
+       wdt_disable();
+       /* enable interal reference for 
+        * comparator 
+        * When the bandgap reference is connected to the Analog Comparator (by setting the ACBG bit in ACSR). */
+}
+
+int main(void)
+{
+       init_board();
+       xvar = 1;       
+       cli();
+       DDRB |= (1 << DDB0); /* set PB0 as output */
+       TCCR0A = TCCR0B = 0;
+       TCCR0A |= (1 << WGM01) | (1 << WGM00) | (1 << COM0A1);
+       TCCR0B |= (1 << CS02) | (1 << CS00); /* clk/1024 prescaler */
+       OCR0A = 0x7F; /* 50% duty cycle */
+       TCNT0 = 0;
+       TIMSK = (1 << OCIE0A) | (1 << OCIE0B) | (1 << TOIE0); /* enable interrupts for overflow and compare */
+       sei();
 
        while(1) {
-               
-       }
+               _delay_ms(100);
+               /* 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(); 
+//
+//             /* board wakes up, set LRA as actuator and
+//              * plays haptic effect */
+//             set_lra_as_actuator();
+//             play_haptic();
 
-       return 0;
+       }
 
 }