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=72e13323a9d6124ba863a70a71dc676af916a876;hp=cbbef9e02a78d902ef606dad286ffa8cb90358da;hb=c30006aaf666f7cff3a6ab949c613c2f8cc6163b;hpb=f956c1fa7f47b0e8b8afe323c2eff1b6c2607c2a

diff --git a/firmware/ambient.c b/firmware/ambient.c
index cbbef9e..72e1332 100644
--- a/firmware/ambient.c
+++ b/firmware/ambient.c
@@ -2,47 +2,68 @@
 
 #include "lights.h"
 
+#define AMBIENT_VAL_SHIFT 2
 static uint16_t ambient_val;
 volatile unsigned char ambient_zone;
-static unsigned char ambient_zone_set;
 
-static uint16_t ambient_zones[] = {
-	0x10, 0x18, 0x20, 0x40, 0x100, 0x400, 0x1000, 0x4000, 0xffff
+/* My photodiode reads 0x00C5 .. 0x033B */
+typedef struct {
+	uint16_t lo, hi;
+} ambient_zone_t;
+
+/*
+ * Note: these have to be sorted, starting with 0, ending with 0xFFFF
+ * and having small overlaps in order to provide a bit of hysteresis.
+ */
+static ambient_zone_t ambient_zones[] = {
+	{ 0x0000                   , 0x0290<<AMBIENT_VAL_SHIFT }, // dark
+	{ 0x0280<<AMBIENT_VAL_SHIFT, 0x0300<<AMBIENT_VAL_SHIFT }, // evening
+	{ 0x02f8<<AMBIENT_VAL_SHIFT, 0x0310<<AMBIENT_VAL_SHIFT }, // dawn
+	{ 0x0308<<AMBIENT_VAL_SHIFT, 0xffff                    }, // day
 };
 #define N_AMBIENT_ZONES (sizeof(ambient_zones)/sizeof(ambient_zones[0]))
 
-void ambient_init()
+void init_ambient()
 {
 	ambient_val = 0;
-	ambient_zone = 0;
-	ambient_zone_set = 0;
+	ambient_zone = 1;
 }
 
 void ambient_zone_changed()
 {
-	log_byte(0xCC);
+#if 1
+	log_byte(0xab);
 	log_byte(ambient_zone);
 	log_word(ambient_val);
+	log_flush();
+#endif
+
+	// led_set_pattern(N_PWMLEDS, status_led_pattern_select());
+	// led_set_pattern(N_PWMLEDS+1, illumination_led_pattern_select());
+	// pattern_reload();
 }
 
 void ambient_adc(uint16_t adcval)
 {
-	unsigned char newzone;
+	unsigned char old_zone = ambient_zone;
 
-	if (!ambient_zone_set)
-		ambient_val = adcval << 4;
-	else // running sum
-		ambient_val += adcval - (ambient_val >> 4);
+	ambient_val += adcval - (ambient_val
+		>> (AMBIENT_VAL_SHIFT - AMBIENT_ADC_SHIFT));
 
-	newzone = 0;
-	while (newzone < N_AMBIENT_ZONES-1
-		&& ambient_zones[newzone] < ambient_val)
-		newzone++;
+	while (ambient_zones[ambient_zone].lo > ambient_val)
+		ambient_zone--;
 
-	if (!ambient_zone_set || newzone != ambient_zone) {
-		ambient_zone = newzone;
-		ambient_zone_set = 1;
-		// ambient_zone_changed();
+	while (ambient_zones[ambient_zone].hi < ambient_val)
+		ambient_zone++;
+
+#if 0
+	if (old_zone != ambient_zone) {
+		log_byte(0xab);
+		log_byte(ambient_zone);
+		log_word(adcval);
+		log_flush();
 	}
+		// ambient_zone_changed();
+#endif
 }