From b3d4cd3651f0bc5d6da19815a63471ea46835c64 Mon Sep 17 00:00:00 2001
From: "Jan \"Yenya\" Kasprzak" <kas@fi.muni.cz>
Date: Thu, 30 Jan 2014 23:59:58 +0100
Subject: [PATCH] status LED visual feedback

---
 firmware/main.c | 47 ++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 40 insertions(+), 7 deletions(-)

diff --git a/firmware/main.c b/firmware/main.c
index 9a04150..afaa557 100644
--- a/firmware/main.c
+++ b/firmware/main.c
@@ -7,7 +7,9 @@
 
 #include "logging.h"
 
-static unsigned char pwm = 1;
+#define N_STEPS 5
+static unsigned char steps[] = { 60, 85, 121, 171, 242 };
+static unsigned char intensity = 0;
 
 static void timer_init()
 {
@@ -19,6 +21,11 @@ static void timer_init()
 	// TCCR1 = _BV(CS11) | _BV(CS13); // clk/512 = 2 kHz
 	GTCCR = _BV(COM1B1) | _BV(PWM1B);
 	OCR1C = 255;
+	OCR1B = 0;
+}
+
+static void set_pwm(unsigned char pwm)
+{
 	OCR1B = pwm;
 }
 
@@ -47,6 +54,11 @@ static void status_led_off()
 	PORTB &= ~_BV(PB2);
 }
 
+static unsigned char status_led_is_on()
+{
+	return PORTB & _BV(PB2) ? 1 : 0;
+}
+
 static void buttons_init()
 {
 	DDRB &= ~(_BV(PB0) | _BV(PB1)); // set as input
@@ -160,9 +172,8 @@ static void power_down()
 
 static void button_one_pressed()
 {
-	if (pwm > 1) {
-		pwm >>= 1;
-		OCR1B = pwm;
+	if (intensity > 0) {
+		set_pwm(steps[--intensity]);
 	} else {
 		power_down();
 	}
@@ -170,9 +181,8 @@ static void button_one_pressed()
 
 static void button_two_pressed()
 {
-	if (pwm < 0x80) {
-		pwm <<= 1;
-		OCR1B = pwm;
+	if (intensity < N_STEPS-1) {
+		set_pwm(steps[++intensity]);
 	}
 }
 
@@ -207,6 +217,28 @@ static void timer_check_buttons()
 	button_state = newstate;
 }
 
+static unsigned char blink_on_time, blink_off_time, n_blinks;
+static unsigned char blink_counter;
+
+static void timer_blink()
+{
+	if (blink_counter) {
+		blink_counter--;
+	} else if (status_led_is_on()) {
+		status_led_off();
+		blink_counter = blink_off_time;
+	} else if (n_blinks) {
+		--n_blinks;
+		status_led_on();
+		blink_counter = blink_on_time;
+	} else {
+		n_blinks = intensity + 1;
+		blink_on_time = 0;
+		blink_off_time = 2;
+		blink_counter = 10;
+	}
+}
+
 int main()
 {
 	log_init();
@@ -239,6 +271,7 @@ int main()
 		if (wdt_timer_fired) {
 			wdt_timer_fired = 0;
 			timer_check_buttons();
+			timer_blink();
 		}
 	}
 }
-- 
2.43.5