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
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
|
#include "quantum.h"
#include "backlight.h"
#include <hal.h>
#include "debug.h"
// TODO: remove short term bodge when refactoring BACKLIGHT_CUSTOM_DRIVER out
#ifdef BACKLIGHT_PIN
# if defined(STM32F0XX) || defined(STM32F0xx)
# error "Backlight support for STMF072 is not available. Please disable."
# endif
// GPIOV2 && GPIOV3
# ifndef BACKLIGHT_PAL_MODE
# define BACKLIGHT_PAL_MODE 2
# endif
// GENERIC
# ifndef BACKLIGHT_PWM_DRIVER
# define BACKLIGHT_PWM_DRIVER PWMD4
# endif
# ifndef BACKLIGHT_PWM_CHANNEL
# define BACKLIGHT_PWM_CHANNEL 3
# endif
static void breathing_callback(PWMDriver *pwmp);
static PWMConfig pwmCFG = {0xFFFF, /* PWM clock frequency */
256, /* PWM period (in ticks) 1S (1/10kHz=0.1mS 0.1ms*10000 ticks=1S) */
NULL, /* No Callback */
{ /* Default all channels to disabled - Channels will be configured durring init */
{PWM_OUTPUT_DISABLED, NULL},
{PWM_OUTPUT_DISABLED, NULL},
{PWM_OUTPUT_DISABLED, NULL},
{PWM_OUTPUT_DISABLED, NULL}},
0, /* HW dependent part.*/
0};
static PWMConfig pwmCFG_breathing = {0xFFFF, /** PWM clock frequency */
256, /* PWM period (in ticks) 1S (1/10kHz=0.1mS 0.1ms*10000 ticks=1S) */
breathing_callback, /* Breathing Callback */
{ /* Default all channels to disabled - Channels will be configured durring init */
{PWM_OUTPUT_DISABLED, NULL},
{PWM_OUTPUT_DISABLED, NULL},
{PWM_OUTPUT_DISABLED, NULL},
{PWM_OUTPUT_DISABLED, NULL}},
0, /* HW dependent part.*/
0};
// See http://jared.geek.nz/2013/feb/linear-led-pwm
static uint16_t cie_lightness(uint16_t v) {
if (v <= 5243) // if below 8% of max
return v / 9; // same as dividing by 900%
else {
uint32_t y = (((uint32_t)v + 10486) << 8) / (10486 + 0xFFFFUL); // add 16% of max and compare
// to get a useful result with integer division, we shift left in the expression above
// and revert what we've done again after squaring.
y = y * y * y >> 8;
if (y > 0xFFFFUL) // prevent overflow
return 0xFFFFU;
else
return (uint16_t)y;
}
}
void backlight_init_ports(void) {
// printf("backlight_init_ports()\n");
# ifdef USE_GPIOV1
palSetPadMode(PAL_PORT(BACKLIGHT_PIN), PAL_PAD(BACKLIGHT_PIN), PAL_MODE_STM32_ALTERNATE_PUSHPULL);
# else
palSetPadMode(PAL_PORT(BACKLIGHT_PIN), PAL_PAD(BACKLIGHT_PIN), PAL_MODE_ALTERNATE(BACKLIGHT_PAL_MODE));
# endif
pwmCFG.channels[BACKLIGHT_PWM_CHANNEL - 1].mode = PWM_OUTPUT_ACTIVE_HIGH;
pwmCFG_breathing.channels[BACKLIGHT_PWM_CHANNEL - 1].mode = PWM_OUTPUT_ACTIVE_HIGH;
pwmStart(&BACKLIGHT_PWM_DRIVER, &pwmCFG);
backlight_set(get_backlight_level());
if (is_backlight_breathing()) {
breathing_enable();
}
}
void backlight_set(uint8_t level) {
// printf("backlight_set(%d)\n", level);
if (level == 0) {
// Turn backlight off
pwmDisableChannel(&BACKLIGHT_PWM_DRIVER, BACKLIGHT_PWM_CHANNEL - 1);
} else {
// Turn backlight on
if (!is_breathing()) {
uint32_t duty = (uint32_t)(cie_lightness(0xFFFF * (uint32_t)level / BACKLIGHT_LEVELS));
// printf("duty: (%d)\n", duty);
pwmEnableChannel(&BACKLIGHT_PWM_DRIVER, BACKLIGHT_PWM_CHANNEL - 1, PWM_FRACTION_TO_WIDTH(&BACKLIGHT_PWM_DRIVER, 0xFFFF, duty));
}
}
}
uint8_t backlight_tick = 0;
void backlight_task(void) {}
# define BREATHING_NO_HALT 0
# define BREATHING_HALT_OFF 1
# define BREATHING_HALT_ON 2
# define BREATHING_STEPS 128
static uint8_t breathing_period = BREATHING_PERIOD;
static uint8_t breathing_halt = BREATHING_NO_HALT;
static uint16_t breathing_counter = 0;
bool is_breathing(void) { return BACKLIGHT_PWM_DRIVER.config == &pwmCFG_breathing; }
static inline void breathing_min(void) { breathing_counter = 0; }
static inline void breathing_max(void) { breathing_counter = breathing_period * 256 / 2; }
void breathing_interrupt_enable(void) {
pwmStop(&BACKLIGHT_PWM_DRIVER);
pwmStart(&BACKLIGHT_PWM_DRIVER, &pwmCFG_breathing);
chSysLockFromISR();
pwmEnablePeriodicNotification(&BACKLIGHT_PWM_DRIVER);
pwmEnableChannelI(&BACKLIGHT_PWM_DRIVER, BACKLIGHT_PWM_CHANNEL - 1, PWM_FRACTION_TO_WIDTH(&BACKLIGHT_PWM_DRIVER, 0xFFFF, 0xFFFF));
chSysUnlockFromISR();
}
void breathing_interrupt_disable(void) {
pwmStop(&BACKLIGHT_PWM_DRIVER);
pwmStart(&BACKLIGHT_PWM_DRIVER, &pwmCFG);
}
void breathing_enable(void) {
breathing_counter = 0;
breathing_halt = BREATHING_NO_HALT;
breathing_interrupt_enable();
}
void breathing_pulse(void) {
if (get_backlight_level() == 0)
breathing_min();
else
breathing_max();
breathing_halt = BREATHING_HALT_ON;
breathing_interrupt_enable();
}
void breathing_disable(void) {
// printf("breathing_disable()\n");
breathing_interrupt_disable();
// Restore backlight level
backlight_set(get_backlight_level());
}
void breathing_self_disable(void) {
if (get_backlight_level() == 0)
breathing_halt = BREATHING_HALT_OFF;
else
breathing_halt = BREATHING_HALT_ON;
}
void breathing_toggle(void) {
if (is_breathing())
breathing_disable();
else
breathing_enable();
}
void breathing_period_set(uint8_t value) {
if (!value) value = 1;
breathing_period = value;
}
void breathing_period_default(void) { breathing_period_set(BREATHING_PERIOD); }
void breathing_period_inc(void) { breathing_period_set(breathing_period + 1); }
void breathing_period_dec(void) { breathing_period_set(breathing_period - 1); }
/* To generate breathing curve in python:
* from math import sin, pi; [int(sin(x/128.0*pi)**4*255) for x in range(128)]
*/
static const uint8_t breathing_table[BREATHING_STEPS] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 17, 20, 24, 28, 32, 36, 41, 46, 51, 57, 63, 70, 76, 83, 91, 98, 106, 113, 121, 129, 138, 146, 154, 162, 170, 178, 185, 193, 200, 207, 213, 220, 225, 231, 235, 240, 244, 247, 250, 252, 253, 254, 255, 254, 253, 252, 250, 247, 244, 240, 235, 231, 225, 220, 213, 207, 200, 193, 185, 178, 170, 162, 154, 146, 138, 129, 121, 113, 106, 98, 91, 83, 76, 70, 63, 57, 51, 46, 41, 36, 32, 28, 24, 20, 17, 15, 12, 10, 8, 6, 5, 4, 3, 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
// Use this before the cie_lightness function.
static inline uint16_t scale_backlight(uint16_t v) { return v / BACKLIGHT_LEVELS * get_backlight_level(); }
static void breathing_callback(PWMDriver *pwmp) {
(void)pwmp;
uint16_t interval = (uint16_t)breathing_period * 256 / BREATHING_STEPS;
// resetting after one period to prevent ugly reset at overflow.
breathing_counter = (breathing_counter + 1) % (breathing_period * 256);
uint8_t index = breathing_counter / interval % BREATHING_STEPS;
if (((breathing_halt == BREATHING_HALT_ON) && (index == BREATHING_STEPS / 2)) || ((breathing_halt == BREATHING_HALT_OFF) && (index == BREATHING_STEPS - 1))) {
breathing_interrupt_disable();
}
uint32_t duty = cie_lightness(scale_backlight(breathing_table[index] * 256));
chSysLockFromISR();
pwmEnableChannelI(&BACKLIGHT_PWM_DRIVER, BACKLIGHT_PWM_CHANNEL - 1, PWM_FRACTION_TO_WIDTH(&BACKLIGHT_PWM_DRIVER, 0xFFFF, duty));
chSysUnlockFromISR();
}
#else
__attribute__((weak)) void backlight_init_ports(void) {}
__attribute__((weak)) void backlight_set(uint8_t level) {}
__attribute__((weak)) void backlight_task(void) {}
#endif
|
