1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
/*
* MIT License
*
* Copyright (c) 2022 CC
*
* 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 "lightmeter_face.h"
#include "watch_utility.h"
#include "watch_slcd.h"
uint16_t lightmeter_mod(uint16_t m, uint16_t n) { return (m%n + n)%n; }
void lightmeter_face_setup(movement_settings_t *settings, uint8_t watch_face_index, void ** context_ptr) {
(void) settings;
(void) watch_face_index;
if (*context_ptr == NULL) {
*context_ptr = malloc(sizeof(lightmeter_state_t));
lightmeter_state_t *state = (lightmeter_state_t*) *context_ptr;
state->waiting_for_conversion = 0;
state->lux = 0.0;
state->mode = 0;
state->iso = LIGHTMETER_ISO_100;
state->ap = LIGHTMETER_AP_4P0;
}
}
void lightmeter_face_activate(movement_settings_t *settings, void *context) {
(void) settings;
lightmeter_state_t *state = (lightmeter_state_t*) context;
state->waiting_for_conversion = 0;
lightmeter_show_ev(state); // Print most current reading
watch_enable_i2c();
return;
}
void lightmeter_show_ev(lightmeter_state_t *state) {
float ev = max(min(
log2(state->lux) +
lightmeter_isos[state->iso].ev +
LIGHTMETER_CALIBRATION,
99), -9);
int evt = round(2*ev); // Truncated EV
// Print EV
char strbuff[7];
watch_clear_all_indicators();
watch_display_string("EV ", 0);
sprintf(strbuff, "%2i", (uint16_t) abs(evt/2)); // Print whole part of EV
watch_display_string(strbuff, 2);
if(evt%2) watch_set_indicator(WATCH_INDICATOR_LAP); // Indicate half stop
if(ev<0) watch_set_pixel(1,9); // Indicate negative EV
// Handle lux mode
if(state->mode == 1) {
sprintf(strbuff, "%6.0f", min(state->lux, 999999.0));
watch_display_string(strbuff, 4);
return;
}
// Find and print best shutter speed
uint16_t bestsh = 0;
float besterr = 1.0/0.0;
float errbuf = 1.0/0.0;
float comp_ev = ev + lightmeter_aps[state->ap].ev;
for(uint16_t ind = 2; ind < LIGHTMETER_N_SHS; ind++) {
errbuf = comp_ev + lightmeter_shs[ind].ev;
if( fabs(errbuf) < fabs(besterr)) {
besterr = errbuf;
bestsh = ind;
}
}
if(besterr >= 0.5) watch_display_string(lightmeter_shs[LIGHTMETER_SH_HIGH].str, 4);
else if(besterr <= -0.5) watch_display_string(lightmeter_shs[LIGHTMETER_SH_LOW].str, 4);
else watch_display_string(lightmeter_shs[bestsh].str, 4);
// Print aperture
watch_display_string(lightmeter_aps[state->ap].str, 7);
return;
}
bool lightmeter_face_loop(movement_event_t event, movement_settings_t *settings, void *context) {
(void) settings;
lightmeter_state_t *state = (lightmeter_state_t*) context;
opt3001_Config_t c;
switch (event.event_type) {
case EVENT_TICK:
if(state->waiting_for_conversion) { // Check if measurement is ready...
c = opt3001_readConfig(lightmeter_addr);
if(c.ConversionReady) {
state->waiting_for_conversion = 0;
opt3001_t result = opt3001_readResult(lightmeter_addr);
state->lux = result.lux;
lightmeter_show_ev(state);
}
}
break;
case EVENT_ALARM_BUTTON_UP: // Increment aperture
state->ap = lightmeter_mod(state->ap+1, LIGHTMETER_N_APS);
lightmeter_show_ev(state);
break;
case EVENT_LIGHT_BUTTON_UP: // Decrement aperture
if(state->ap == 0) state->ap = LIGHTMETER_N_APS-1;
else state->ap = lightmeter_mod(state->ap-1, LIGHTMETER_N_APS);
lightmeter_show_ev(state);
break;
case EVENT_LIGHT_LONG_PRESS: // Cycle ISO
state->iso = lightmeter_mod(state->iso+1, LIGHTMETER_N_ISOS);
watch_clear_all_indicators();
watch_display_string("EV ", 0);
watch_display_string(lightmeter_isos[state->iso].str, 4);
break;
case EVENT_ALARM_LONG_PRESS: // Take measurement
opt3001_writeConfig(lightmeter_addr, lightmeter_takeNewReading);
state->waiting_for_conversion = 1;
watch_clear_all_indicators();
watch_display_string("EV ", 0);
watch_display_string(lightmeter_isos[state->iso].str, 4);
watch_set_indicator(WATCH_INDICATOR_SIGNAL);
break;
case EVENT_MODE_LONG_PRESS: // Toggle mode
state->mode = !state->mode;
lightmeter_show_ev(state);
break;
case EVENT_TIMEOUT:
movement_move_to_face(0);
break;
default:
movement_default_loop_handler(event, settings);
break;
}
return true;
}
void lightmeter_face_resign(movement_settings_t *settings, void *context) {
(void) settings;
(void) context;
opt3001_writeConfig(lightmeter_addr, lightmeter_off);
watch_disable_i2c();
return;
}
|
