From f99ea292fff62df86e67baf55b432d24b467618d Mon Sep 17 00:00:00 2001
From: Bart Van Der Meerssche <bart.vandermeerssche@flukso.net>
Date: Thu, 3 Feb 2011 12:17:33 +0100
Subject: [PATCH] [avr] write sensor data to EEPROM when power-loss is detected

---
 mote/v2/avr/main.c | 33 +++++++++++++++++----------------
 mote/v2/avr/main.h |  2 ++
 2 files changed, 19 insertions(+), 16 deletions(-)

diff --git a/mote/v2/avr/main.c b/mote/v2/avr/main.c
index 05bf290..dc72f5b 100644
--- a/mote/v2/avr/main.c
+++ b/mote/v2/avr/main.c
@@ -241,25 +241,16 @@ ISR(TIMER1_COMPA_vect)
 
 ISR(ANALOG_COMP_vect)
 {
-	uint8_t i;
+	disable_led();
 
-	PORTB |= (1<<PB0);
+	eeprom_write_block((const void*)&sensor, (void*)&EEPROM_sensor, sizeof(sensor));
+	eeprom_write_block((const void*)&event, (void*)&EEPROM_event, sizeof(event));
 
-	//disable uC sections to consume less power while writing to EEPROM
-	//disable UART Tx and Rx:
-	UCSR0B &= ~((1<<RXEN0) | (1<<TXEN0));
-	//disable ADC:
-	ADCSRA &= ~(1<<ADEN);
+//	uint8_t i;
+//	for (i=0; i<128; i++)
+//		eeprom_write_byte((uint8_t *)i, i); 			
 
-	for (i=0; i<128; i++)
-		eeprom_write_byte((uint8_t *)i, i); 			
-
-	//enable UART Tx and Rx:
-	UCSR0B |= (1<<RXEN0) | (1<<TXEN0);
-	// enable ADC and start a first ADC conversion
-	ADCSRA |= (1<<ADEN) | (1<<ADSC);
-
-	PORTB &= ~(1<<PB0);
+	setup_led();
 }
 
 void setup_datastructs(void)
@@ -273,10 +264,20 @@ void setup_datastructs(void)
 
 void setup_led(void)
 {
+	// set output low (= LED enabled)
+	PORTB &= ~(1<<PB0);
 	// set LED pin (PB0) as output pin
 	DDRB |= (1<<DDB0);
 }
 
+void disable_led(void)
+{
+	// set LED pin (PB0) as input pin
+	DDRB &= ~(1<<DDB0);
+	// disable pull-up
+	PORTB &= ~(1<<PB0);
+}
+
 void setup_pulse_input(void)
 {
 	// PD2=INT0 and PD3=INT1 configuration
diff --git a/mote/v2/avr/main.h b/mote/v2/avr/main.h
index e5a2978..4f03909 100644
--- a/mote/v2/avr/main.h
+++ b/mote/v2/avr/main.h
@@ -91,6 +91,8 @@ asm volatile ( \
 )
 
 void register_pulse(volatile struct sensor_struct *psensor, volatile struct state_struct *pstate);
+void setup_led(void);
+void disable_led(void);
 void setup_datastructs(void);
 void setup_pulse_input(void);
 void setup_adc(void);