From 44655bfd75c9213673c827661a6471b3fb38032f Mon Sep 17 00:00:00 2001
From: "Jan \"Yenya\" Kasprzak" <kas@fi.muni.cz>
Date: Sat, 9 Jun 2012 00:45:42 +0200
Subject: [PATCH] pattern flashing

---
 lights.c | 72 +++++++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 63 insertions(+), 9 deletions(-)

diff --git a/lights.c b/lights.c
index aa018d9..6d78e23 100644
--- a/lights.c
+++ b/lights.c
@@ -9,9 +9,9 @@ volatile uint16_t adcval;
 
 volatile struct
 {
-  uint8_t tmr_int: 1;
+  uint8_t pwm_int: 1;
   uint8_t adc_int: 1;
-  uint8_t rx_int: 1;
+  uint8_t tmr_int: 1;
 }
 intflags;
 
@@ -28,30 +28,65 @@ ISR(ADC_vect)
 ISR(TIMER1_OVF_vect)
 {
 	TIMSK &= ~_BV(TOIE1);
-	intflags.tmr_int = 1;
+	intflags.pwm_int = 1;
 }
 
-int main(void)
+ISR(TIMER0_COMPA_vect)
 {
-	char seen = 0;
+	intflags.tmr_int = 1;
+}
 
+struct {
+	unsigned char intensity :2;
+	unsigned char length :6;
+} pattern[] = { {1, 2}, {0, 4}, { 1, 2 }, {0, 15}, {0, 0} };
+	
+static void inline init_pwm()
+{
 	TCCR1C = _BV(COM1D0) | _BV(COM1D1) | _BV(PWM1D);
 	TCCR1A = _BV(COM1A0) | _BV(COM1A1) | _BV(COM1B0) | _BV(COM1B1) | _BV(PWM1A) | _BV(PWM1B);
-	TCCR1B = 0x80| _BV(CS13) | _BV(CS10);
+	TCCR1B = 0x80| _BV(CS13) | _BV(CS11);
 	TC1H  = 0x03;
 	OCR1C = 0xFF;
 	OCR1D = OCR1B = OCR1A = 0x40;
 	TCNT1 = 0;
 	DDRB |= _BV( PB5 ) | _BV( PB1 ) | _BV( PB3 );
 	PORTB &= ~(_BV( PB5 ) | _BV( PB1 ) | _BV( PB3 ));
-	TIMSK = _BV(TOIE1);
+	TIMSK |= _BV(TOIE1);
+}
 
+static void inline init_adc()
+{
 	ADCSRA = _BV(ADEN) | _BV(ADATE) | _BV(ADPS1) | _BV(ADPS0);
 	ADMUX = _BV(REFS1) | _BV(MUX0);
 	// ADCSRB = _BV(REFS2); 
 	DIDR0 = _BV(ADC1D) | _BV(AREFD);
+}
+
+static void inline init_tmr()
+{
+	TCCR0A = _BV(WGM00);
+	TCCR0B = _BV(CS02); // | _BV(CS00);
+	OCR0A = 0x80;
+	TIMSK |= _BV(OCIE0A);
+	DDRA |= _BV( PA0 );
+}
+
+int main(void)
+{
+	char seen = 0;
+	char pcount, ppos;
+
+	init_pwm();
+	init_adc();
+	init_tmr();
+
+	ppos = 0;
+	pcount = pattern[ppos].length;
+        if (pattern[ppos].intensity) {
+		PORTA |=  _BV( PA0 );
+	}
 
-	sei();
 	while (1) {
 		unsigned char pwmhi, pwmlo;
 
@@ -77,12 +112,31 @@ int main(void)
 			TIMSK |= _BV(TOIE1);
 		}
 
+		if (intflags.pwm_int) {
+			intflags.pwm_int = 0;
+			ADCSRA |= _BV(ADIE) | _BV(ADSC);
+		}
+
 		if (intflags.tmr_int) {
 			intflags.tmr_int = 0;
-			ADCSRA |= _BV(ADIE) | _BV(ADSC);
+			if (--pcount == 0) {
+				ppos++;
+				pcount = pattern[ppos].length;
+				if (!pcount) {
+					ppos = 0;
+					pcount = pattern[ppos].length;
+				}
+				if (pattern[ppos].intensity) {
+					PORTA |= _BV(PA0);
+				} else {
+					PORTA &= ~_BV(PA0);
+				}
+			}
 		}
 
+		sei();
 		sleep_mode();
+		cli();
 
 #if 0
 		if (!seen) {
-- 
2.39.3