X-Git-Url: https://www.fi.muni.cz/~kas/git//home/kas/public_html/git/?p=bike-lights.git;a=blobdiff_plain;f=firmware%2Fambient.c;h=02377ccd46586ab1895083adeb09dbda77ff50e5;hp=59c85a79b2e17bb11b65b54d0d3fb79f170e3154;hb=65c3ad96cf307c3b77b36e6f6a2af5201c213a3c;hpb=b0572d0cae20a9fd351b197a0ea9b01fc658ee77

diff --git a/firmware/ambient.c b/firmware/ambient.c
index 59c85a7..02377cc 100644
--- a/firmware/ambient.c
+++ b/firmware/ambient.c
@@ -1,9 +1,18 @@
 #include <avr/io.h>
+#include <avr/eeprom.h>
 
 #include "lights.h"
 
+#define AMBIENT_VAL_SHIFT 2
 static uint16_t ambient_val;
 volatile unsigned char ambient_zone;
+static unsigned char ambient_min, ambient_max;
+
+/* logging */
+#define AMBIENT_LOG_SIZE 128
+static unsigned char ambient_log_offset_stored EEMEM;
+static unsigned char ambient_log_offset;
+static unsigned char ambient_log[AMBIENT_LOG_SIZE] EEMEM;
 
 /* My photodiode reads 0x00C5 .. 0x033B */
 typedef struct {
@@ -15,17 +24,48 @@ typedef struct {
  * and having small overlaps in order to provide a bit of hysteresis.
  */
 static ambient_zone_t ambient_zones[] = {
-	{ 0x0000, 0xb000 }, // dark
-	{ 0xa800, 0xc400 },
-	{ 0xc200, 0xcb00 },
-	{ 0xca80, 0xffff }
+	{ 0x0000                   , 0x0280<<AMBIENT_VAL_SHIFT }, // dark
+	{ 0x0270<<AMBIENT_VAL_SHIFT, 0x02f0<<AMBIENT_VAL_SHIFT }, // evening
+	{ 0x02e8<<AMBIENT_VAL_SHIFT, 0x030a<<AMBIENT_VAL_SHIFT }, // dawn
+	{ 0x0308<<AMBIENT_VAL_SHIFT, 0xffff                    }, // day
 };
 #define N_AMBIENT_ZONES (sizeof(ambient_zones)/sizeof(ambient_zones[0]))
 
 void init_ambient()
 {
 	ambient_val = 0;
+	ambient_max = 0;
+	ambient_min = 0xFF;
 	ambient_zone = 1;
+
+	ambient_log_offset = eeprom_read_byte(&ambient_log_offset_stored);
+
+	if (ambient_log_offset == AMBIENT_LOG_SIZE)
+		ambient_log_offset = 0; // start over
+}
+
+void susp_ambient()
+{
+	unsigned char stored_offset;
+
+	ambient_log_min_max();
+
+	stored_offset = eeprom_read_byte(&ambient_log_offset_stored);
+	if (stored_offset != ambient_log_offset)
+		eeprom_write_byte(&ambient_log_offset_stored,
+			ambient_log_offset);
+}
+
+void ambient_log_min_max()
+{
+	if (ambient_log_offset >= AMBIENT_LOG_SIZE - 1)
+		return;
+
+	eeprom_write_byte(&ambient_log[ambient_log_offset++], ambient_min);
+	eeprom_write_byte(&ambient_log[ambient_log_offset++], ambient_max);
+
+	ambient_min = 0xFF;
+	ambient_max = 0;
 }
 
 void ambient_zone_changed()
@@ -45,8 +85,10 @@ void ambient_zone_changed()
 void ambient_adc(uint16_t adcval)
 {
 	unsigned char old_zone = ambient_zone;
+	unsigned char byte_val;
 
-	ambient_val += adcval - (ambient_val >> 3);
+	ambient_val += adcval - (ambient_val
+		>> (AMBIENT_VAL_SHIFT - AMBIENT_ADC_SHIFT));
 
 	while (ambient_zones[ambient_zone].lo > ambient_val)
 		ambient_zone--;
@@ -54,6 +96,13 @@ void ambient_adc(uint16_t adcval)
 	while (ambient_zones[ambient_zone].hi < ambient_val)
 		ambient_zone++;
 
+	byte_val = adcval >> 2;
+
+	if (ambient_min > byte_val)
+		ambient_min = byte_val;
+
+	if (ambient_max < byte_val)
+		ambient_max = byte_val;
 #if 0
 	if (old_zone != ambient_zone) {
 		log_byte(0xab);