From: Jan "Yenya" Kasprzak <kas@fi.muni.cz>
Date: Tue, 28 Aug 2012 19:31:32 +0000 (+0200)
Subject: logging.c: don't wear out eeprom on frequent reboots
X-Git-Tag: gedasymbols-20120913~51
X-Git-Url: https://www.fi.muni.cz/~kas/git//home/kas/public_html/git/?p=bike-lights.git;a=commitdiff_plain;h=7d2f4ab4e669b0b0f484604016e93a25d3b9cf33

logging.c: don't wear out eeprom on frequent reboots
---

diff --git a/logging.c b/logging.c
index 04f9515..5c5beeb 100644
--- a/logging.c
+++ b/logging.c
@@ -6,18 +6,34 @@
 #include "lights.h"
 
 #define LOG_BUFFER 128
-static unsigned char log_state EEMEM;
 static unsigned char log_buffer_ee[LOG_BUFFER] EEMEM;
 static unsigned char log_buffer_count;
 static unsigned char log_buffer[LOG_BUFFER];
+static unsigned char log_state EEMEM;
+static unsigned char reboot_count EEMEM = 0;
+static unsigned char can_write_eeprom = 0;
 
 void log_set_state(unsigned char val)
 {
-	eeprom_write_byte(&log_state, val);
+	if (can_write_eeprom)
+		eeprom_write_byte(&log_state, val);
 }
 
 void log_init()
 {
+	unsigned char r_count;
+
+	r_count = eeprom_read_byte(&reboot_count);
+
+	if (r_count < 5) {
+		r_count++;
+		eeprom_write_byte(&reboot_count, r_count);
+		can_write_eeprom = 1;
+	} else {
+		//eeprom_write_byte(&log_state, 0xFF);
+		can_write_eeprom = 0;
+	}
+
 	log_set_state(1);
 	log_buffer_count = 0;
 }
@@ -42,6 +58,10 @@ void log_flush() {
 	unsigned char i;
 
 	log_buffer_count = LOG_BUFFER;
+
+	if (!can_write_eeprom)
+		return;
+
 	for (i=0; i < LOG_BUFFER; i++) {
 		eeprom_write_byte(&log_buffer_ee[i],
 			log_buffer[i]);