#include <avr/io.h>
+#include <avr/eeprom.h>
#include "lights.h"
-static uint16_t ambient_val;
+#define AMBIENT_FAST_SHIFT 2 // running avg of ADC vals
+#define AMBIENT_SLOW_SHIFT 6 // 1 << AMBIENT_SLOW_SHIFT times slower
+
+static uint16_t ambient_fast, ambient_slow;
volatile unsigned char ambient_zone;
-static unsigned char ambient_zone_set;
+static unsigned char ambient_min, ambient_max, ambient_drop;
+
+/* 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 {
+ uint16_t lo, hi; // TODO: consider changing this to bytes
+} ambient_zone_t;
-static uint16_t ambient_zones[] = {
- 0x0c00, 0x0d00, 0x1000, 0x1800, 0x2800, 0x2f80, 0xffff
+/*
+ * 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[N_AMBIENT_ZONES] = {
+ { 0x0000, 0x0250 }, // dark
+ { 0x0240, 0x02e0 }, // evening
+ { 0x02c0, 0x0306 }, // dawn
+ { 0x02f8, 0xffff }, // day
};
-#define N_AMBIENT_ZONES (sizeof(ambient_zones)/sizeof(ambient_zones[0]))
void init_ambient()
{
- ambient_val = 0;
- ambient_zone = 0;
- ambient_zone_set = 0;
+ ambient_slow = 0;
+ ambient_fast = 0;
+ ambient_max = 0;
+ ambient_min = 0xFF;
+ ambient_zone = 1;
+ ambient_drop = 0;
+
+ ambient_log_offset = eeprom_read_byte(&ambient_log_offset_stored);
+
+ if (ambient_log_offset == AMBIENT_LOG_SIZE)
+ ambient_log_offset = 0; // start over
}
-void ambient_zone_changed()
+void susp_ambient()
{
- log_byte(0xab);
- log_byte(ambient_zone);
- log_word(ambient_val);
- log_flush();
+ 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;
+
+ ambient_max -= ambient_min;
+ ambient_max >>= 2;
+ if (ambient_max > 15)
+ ambient_max = 15;
+
+ ambient_drop >>= 2;
+ if (ambient_drop > 15)
+ ambient_drop = 15;
+
+ eeprom_write_byte(&ambient_log[ambient_log_offset++], ambient_min);
+ eeprom_write_byte(&ambient_log[ambient_log_offset++],
+ (ambient_max << 4) | ambient_drop);
+
+ ambient_min = 0xFF;
+ ambient_max = 0;
+ ambient_drop = 0;
+}
+
+static inline void ambient_zone_changed()
+{
+ pwmled_select_brightness();
pattern_reload();
}
+static unsigned char val_to_zone(uint16_t ambient_val)
+{
+ unsigned char new_zone = ambient_zone;
+
+ while (ambient_zones[new_zone].lo > ambient_val)
+ new_zone--;
+
+ while (ambient_zones[new_zone].hi < ambient_val)
+ new_zone++;
+
+ return new_zone;
+}
+
void ambient_adc(uint16_t adcval)
{
- unsigned char newzone;
-
- if (!ambient_zone_set)
- ambient_val = adcval << 4;
- else // running sum
- ambient_val += adcval - (ambient_val >> 4);
-
- newzone = 0;
- while (newzone < N_AMBIENT_ZONES-1
- && ambient_zones[newzone] < ambient_val)
- newzone++;
-
- // TODO: implement hysteresis?
- if (!ambient_zone_set || newzone != ambient_zone) {
- ambient_zone = newzone;
- ambient_zone_set = 1;
- // ambient_zone_changed();
+ unsigned char new_zone, user_zone;
+ unsigned char byte_fast, byte_slow, drop;
+ uint16_t a_10bit;
+
+ // running avg - shorter timespan
+ ambient_fast += adcval - (ambient_fast >> AMBIENT_FAST_SHIFT);
+
+ // running avg - longer timespan
+ a_10bit = ambient_fast >> (AMBIENT_FAST_SHIFT + AMBIENT_ADC_SHIFT);
+ ambient_slow += a_10bit - (ambient_slow >> AMBIENT_SLOW_SHIFT);
+
+ // ambient zones are governed by shorter timespan by default
+ new_zone = val_to_zone(a_10bit);
+
+ if (new_zone > 1 && (
+ new_zone == ambient_zone-1 || new_zone == ambient_zone+1)) {
+ // but change to the neighbouring zone is governed by _slow,
+ // except to the darkest zone, where we want fast reaction.
+ new_zone = val_to_zone(ambient_slow >> AMBIENT_SLOW_SHIFT);
+ }
+
+ // user_param ambient zone override
+ if ((user_zone = get_user_param(0)) > 0)
+ new_zone = user_zone - 1;
+
+ // TODO: maybe use these values instead of 10-bit?
+ byte_fast = a_10bit >> 2;
+ byte_slow = ambient_slow >> (AMBIENT_SLOW_SHIFT + 2);
+
+ if (byte_slow > byte_fast) {
+ drop = byte_slow - byte_fast;
+ if (drop > ambient_drop)
+ ambient_drop = drop;
+ }
+
+ if (ambient_min > byte_fast)
+ ambient_min = byte_fast;
+
+ if (ambient_max < byte_fast)
+ ambient_max = byte_fast;
+
+ if (new_zone != ambient_zone) {
+ ambient_zone = new_zone;
+#if 0
+ log_byte(0xab);
+ log_byte(ambient_zone);
+ log_word(adcval);
+ log_flush();
+#endif
+ ambient_zone_changed();
}
}