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second-movement/watch-faces/sensor/light_meter_face.c
Joey Castillo 4a04db6ca6 light meter: was written today lol
2025-05-18 20:45:37 -04:00

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/*
* MIT License
*
* Copyright (c) 2025 Joey Castillo
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "light_meter_face.h"
#include "tc.h"
#include "eic.h"
#include "usb.h"
#include "adc.h"
#ifdef HAS_IR_SENSOR
static void _light_meter_face_update_display(light_meter_state_t *state, uint8_t subsecond) {
if (state->mode >= LIGHT_METER_MODE_AP_IS_SETTING_ISO) {
// Handle ISO settings mode.
watch_clear_display();
// Custom LCD can say "ISO". On Classic, we can't show an S in position 1, so "FI" for FIlm speed will have to suffice.
watch_display_text_with_fallback(WATCH_POSITION_TOP_LEFT, "ISO", "FI");
if (subsecond % 2) {
// for speeds above 50 ISO, last two digits will always be 00.
if (state->iso >= LIGHT_METER_ISO_100) {
watch_display_text(WATCH_POSITION_MINUTES, "00");
}
switch (state->iso) {
case LIGHT_METER_ISO_25:
watch_display_text(WATCH_POSITION_MINUTES, "25");
break;
case LIGHT_METER_ISO_50:
watch_display_text(WATCH_POSITION_MINUTES, "50");
break;
case LIGHT_METER_ISO_100:
watch_display_text(WATCH_POSITION_HOURS, " 1");
break;
case LIGHT_METER_ISO_200:
watch_display_text(WATCH_POSITION_HOURS, " 2");
break;
case LIGHT_METER_ISO_400:
watch_display_text(WATCH_POSITION_HOURS, " 4");
break;
case LIGHT_METER_ISO_800:
watch_display_text(WATCH_POSITION_HOURS, " 8");
break;
case LIGHT_METER_ISO_1600:
watch_display_text(WATCH_POSITION_HOURS, "16");
break;
case LIGHT_METER_ISO_3200:
watch_display_text(WATCH_POSITION_HOURS, "32");
break;
case LIGHT_METER_ISO_COUNT:
// will not reach here
break;
}
}
} else {
// we are in aperture or shutter priority mode.
light_meter_aperture_t aperture;
light_meter_shutter_speed_t shutter;
uint16_t light_level;
if (!adc_is_enabled()) {
/// TODO: need to test this more. If a background task takes a reading and disables the ADC,
// we might hang trying to get an analog value below? So enable it just in case?
// Test and confirm this works before removing this comment.
adc_enable();
return;
}
light_level = adc_get_analog_value(HAL_GPIO_IRSENSE_pin());
/// FIXME: This curve is garbage, but in theory it was meant to convert the light level to an exposure index at ISO 25.
// Readings were taken with the custom LCD and the standard Casio light spreader in place.
// PLENTY of room for improvement here!
const float L = 63188.86f;
const float k = 0.8654f;
const float x0 = 7.45f;
const float C = 2491.21f;
float exposure_index = x0 + (1.0f / k) * log((L / ((float)light_level - C)) - 1);
if (isnan(exposure_index)) exposure_index = 0;
int8_t target_exposure_index_at_f1_or_1s = (int8_t) round(exposure_index) + state->iso;
if (state->mode == LIGHT_METER_MODE_APERTURE_PRIORITY) {
aperture = state->aperture_priority;
shutter = target_exposure_index_at_f1_or_1s - (state->aperture_priority - LIGHT_METER_APERTURE_F1);
} else {
shutter = state->shutter_priority;
aperture = target_exposure_index_at_f1_or_1s - (state->shutter_priority - LIGHT_METER_SHUTTER_1_SEC);
}
if (shutter < LIGHT_METER_SHUTTER_1_SEC) shutter = LIGHT_METER_SHUTTER_1_SEC;
if (aperture < LIGHT_METER_APERTURE_F1) aperture = LIGHT_METER_APERTURE_F1;
// F stop is shown in both AP and SP modes.
watch_clear_display();
watch_display_text_with_fallback(WATCH_POSITION_TOP_LEFT, " F/", " F");
switch (aperture) {
case LIGHT_METER_APERTURE_F1:
watch_display_text(WATCH_POSITION_TOP_RIGHT, " ");
watch_display_text_with_fallback(WATCH_POSITION_TOP, "TooLo", "LO");
break;
case LIGHT_METER_APERTURE_F1_4:
watch_display_text(WATCH_POSITION_TOP_RIGHT, "14");
break;
case LIGHT_METER_APERTURE_F2:
watch_display_text(WATCH_POSITION_TOP_RIGHT, "2 ");
break;
case LIGHT_METER_APERTURE_F2_8:
watch_display_text(WATCH_POSITION_TOP_RIGHT, "28");
break;
case LIGHT_METER_APERTURE_F4:
// classic LCD cannot display 4 in the left digit.
watch_display_text_with_fallback(WATCH_POSITION_TOP_RIGHT, "4 ", " 4");
break;
case LIGHT_METER_APERTURE_F5_6:
// alas this is the goofy one on classic LCD: 5 will look a bit like a cursed sigil here.
watch_display_text(WATCH_POSITION_TOP_RIGHT, "56");
break;
case LIGHT_METER_APERTURE_F8:
watch_display_text_with_fallback(WATCH_POSITION_TOP_RIGHT, "8 ", " 8");
break;
case LIGHT_METER_APERTURE_F11:
watch_display_text(WATCH_POSITION_TOP_RIGHT, "11");
break;
case LIGHT_METER_APERTURE_F16:
watch_display_text(WATCH_POSITION_TOP_RIGHT, "16");
break;
case LIGHT_METER_APERTURE_F22:
watch_display_text(WATCH_POSITION_TOP_RIGHT, "22");
break;
case LIGHT_METER_APERTURE_F32:
watch_display_text(WATCH_POSITION_TOP_RIGHT, "32");
break;
default:
watch_display_text_with_fallback(WATCH_POSITION_BOTTOM, "too HI", "HIGH ");
break;
}
// th at bottom is also shown always
watch_display_text(WATCH_POSITION_SECONDS, "th");
if (shutter >= LIGHT_METER_SHUTTER_1_500) {
// over a 500th of a second, last two digits are always 00
watch_display_text(WATCH_POSITION_MINUTES, "00");
}
switch (shutter) {
case LIGHT_METER_SHUTTER_1_SEC:
case LIGHT_METER_SHUTTER_1_2:
watch_display_text_with_fallback(WATCH_POSITION_BOTTOM, "tooLOw", " LO ");
break;
case LIGHT_METER_SHUTTER_1_4:
watch_display_text(WATCH_POSITION_MINUTES, " 4");
break;
case LIGHT_METER_SHUTTER_1_8:
watch_display_text(WATCH_POSITION_MINUTES, " 8");
break;
case LIGHT_METER_SHUTTER_1_15:
watch_display_text(WATCH_POSITION_MINUTES, "15");
break;
case LIGHT_METER_SHUTTER_1_30:
watch_display_text(WATCH_POSITION_MINUTES, "30");
break;
case LIGHT_METER_SHUTTER_1_60:
watch_display_text(WATCH_POSITION_MINUTES, "60");
break;
case LIGHT_METER_SHUTTER_1_125:
watch_display_text(WATCH_POSITION_HOURS, " 1");
watch_display_text(WATCH_POSITION_MINUTES, "25");
break;
case LIGHT_METER_SHUTTER_1_250:
watch_display_text(WATCH_POSITION_HOURS, " 2");
watch_display_text(WATCH_POSITION_MINUTES, "50");
break;
case LIGHT_METER_SHUTTER_1_500:
watch_display_text(WATCH_POSITION_HOURS, " 5");
break;
case LIGHT_METER_SHUTTER_1_1000:
watch_display_text(WATCH_POSITION_HOURS, "10");
break;
case LIGHT_METER_SHUTTER_1_2000:
watch_display_text(WATCH_POSITION_HOURS, "20");
break;
case LIGHT_METER_SHUTTER_1_4000:
watch_display_text(WATCH_POSITION_HOURS, "40");
break;
default:
watch_display_text_with_fallback(WATCH_POSITION_BOTTOM, "too HI", "HIGH ");
break;
}
}
}
void light_meter_face_setup(uint8_t watch_face_index, void ** context_ptr) {
(void) watch_face_index;
if (*context_ptr == NULL) {
*context_ptr = malloc(sizeof(light_meter_state_t));
memset(*context_ptr, 0, sizeof(light_meter_state_t));
light_meter_state_t *state = (light_meter_state_t *)*context_ptr;
state->iso = LIGHT_METER_ISO_100;
state->mode = LIGHT_METER_MODE_APERTURE_PRIORITY;
state->aperture_priority = LIGHT_METER_APERTURE_F8;
state->shutter_priority = LIGHT_METER_SHUTTER_1_250;
}
}
void light_meter_face_activate(void *context) {
light_meter_state_t *state = (light_meter_state_t *)context;
(void) state;
HAL_GPIO_IR_ENABLE_out();
HAL_GPIO_IR_ENABLE_clr();
HAL_GPIO_IRSENSE_pmuxen(HAL_GPIO_PMUX_ADC);
adc_init();
adc_enable();
movement_request_tick_frequency(4);
}
bool light_meter_face_loop(movement_event_t event, void *context) {
light_meter_state_t *state = (light_meter_state_t *)context;
(void) state;
switch (event.event_type) {
case EVENT_NONE:
case EVENT_ACTIVATE:
case EVENT_TICK:
{
_light_meter_face_update_display(state, event.subsecond);
}
break;
case EVENT_LIGHT_BUTTON_DOWN:
// suppress LED, as it would interfere with light sensing
break;
case EVENT_LIGHT_BUTTON_UP:
switch (state->mode) {
case LIGHT_METER_MODE_APERTURE_PRIORITY:
// in AP mode, move to SP
state->mode = LIGHT_METER_MODE_SHUTTER_PRIORITY;
break;
case LIGHT_METER_MODE_SHUTTER_PRIORITY:
// in SP mode, move to AP
state->mode = LIGHT_METER_MODE_APERTURE_PRIORITY;
break;
case LIGHT_METER_MODE_AP_IS_SETTING_ISO:
// if we are setting ISO, return to the mode we were in before
state->mode = LIGHT_METER_MODE_APERTURE_PRIORITY;
break;
case LIGHT_METER_MODE_SP_IS_SETTING_ISO:
state->mode = LIGHT_METER_MODE_SHUTTER_PRIORITY;
break;
}
_light_meter_face_update_display(state, event.subsecond);
break;
case EVENT_ALARM_BUTTON_UP:
switch (state->mode) {
case LIGHT_METER_MODE_APERTURE_PRIORITY:
state->aperture_priority = (state->aperture_priority + 1) % LIGHT_METER_APERTURE_COUNT;
break;
case LIGHT_METER_MODE_SHUTTER_PRIORITY:
state->shutter_priority = (state->shutter_priority + 1) % LIGHT_METER_SHUTTER_COUNT;
break;
case LIGHT_METER_MODE_AP_IS_SETTING_ISO:
case LIGHT_METER_MODE_SP_IS_SETTING_ISO:
state->iso = (state->iso + 1) % LIGHT_METER_ISO_COUNT;
break;
}
_light_meter_face_update_display(state, event.subsecond);
break;
case EVENT_ALARM_LONG_PRESS:
switch (state->mode) {
case LIGHT_METER_MODE_APERTURE_PRIORITY:
case LIGHT_METER_MODE_SHUTTER_PRIORITY:
// long press in either aperture or shutter priority mode sets the ISO.
state->mode = state->mode + 2;
break;
case LIGHT_METER_MODE_AP_IS_SETTING_ISO:
case LIGHT_METER_MODE_SP_IS_SETTING_ISO:
state->mode = state->mode - 2;
break;
}
_light_meter_face_update_display(state, event.subsecond);
break;
case EVENT_LOW_ENERGY_UPDATE:
if (!watch_sleep_animation_is_running()) {
// start the animation
watch_clear_display();
watch_start_sleep_animation(1000);
// we are not going to sense light in low energy mode, it's a waste of battery.
watch_display_text_with_fallback(WATCH_POSITION_TOP, "Meter", "MT");
watch_display_text_with_fallback(WATCH_POSITION_BOTTOM, "OFF ", "OF F ");
// turn off our power hungry sensors
adc_disable();
HAL_GPIO_IRSENSE_pmuxdis();
HAL_GPIO_IRSENSE_off();
HAL_GPIO_IR_ENABLE_off();
}
break;
default:
return movement_default_loop_handler(event);
}
return false;
}
void light_meter_face_resign(void *context) {
(void) context;
adc_disable();
HAL_GPIO_IRSENSE_pmuxdis();
HAL_GPIO_IRSENSE_off();
HAL_GPIO_IR_ENABLE_off();
}
#endif // HAS_IR_SENSOR
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