- #include "quantum.h"
- #include "backlight.h"
- #include <hal.h>
- #include "debug.h"
-
- // Maximum duty cycle limit
- #ifndef BACKLIGHT_LIMIT_VAL
- # define BACKLIGHT_LIMIT_VAL 255
- #endif
-
- #ifndef BACKLIGHT_PAL_MODE
- # if defined(USE_GPIOV1)
- # define BACKLIGHT_PAL_MODE PAL_MODE_ALTERNATE_PUSHPULL
- # else
- // GPIOV2 && GPIOV3
- # define BACKLIGHT_PAL_MODE 5
- # endif
- #endif
-
- // GENERIC
- #ifndef BACKLIGHT_PWM_DRIVER
- # define BACKLIGHT_PWM_DRIVER PWMD4
- #endif
- #ifndef BACKLIGHT_PWM_CHANNEL
- # define BACKLIGHT_PWM_CHANNEL 3
- #endif
-
- // Support for pins which are on TIM1_CH1N - requires STM32_PWM_USE_ADVANCED
- #ifdef BACKLIGHT_PWM_COMPLEMENTARY_OUTPUT
- # if BACKLIGHT_ON_STATE == 1
- # define PWM_OUTPUT_MODE PWM_COMPLEMENTARY_OUTPUT_ACTIVE_LOW;
- # else
- # define PWM_OUTPUT_MODE PWM_COMPLEMENTARY_OUTPUT_ACTIVE_HIGH;
- # endif
- #else
- # if BACKLIGHT_ON_STATE == 1
- # define PWM_OUTPUT_MODE PWM_OUTPUT_ACTIVE_HIGH;
- # else
- # define PWM_OUTPUT_MODE PWM_OUTPUT_ACTIVE_LOW;
- # endif
- #endif
-
- static PWMConfig pwmCFG = {0xFFFF, /* PWM clock frequency */
- 256, /* PWM period (in ticks) 1S (1/10kHz=0.1mS 0.1ms*10000 ticks=1S) */
- NULL, /* 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;
- }
- }
-
- static uint32_t rescale_limit_val(uint32_t val) {
- // rescale the supplied backlight value to be in terms of the value limit
- return (val * (BACKLIGHT_LIMIT_VAL + 1)) / 256;
- }
-
- void backlight_init_ports(void) {
- #ifdef USE_GPIOV1
- palSetPadMode(PAL_PORT(BACKLIGHT_PIN), PAL_PAD(BACKLIGHT_PIN), BACKLIGHT_PAL_MODE);
- #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_MODE;
- pwmStart(&BACKLIGHT_PWM_DRIVER, &pwmCFG);
-
- backlight_set(get_backlight_level());
-
- #ifdef BACKLIGHT_BREATHING
- if (is_backlight_breathing()) {
- breathing_enable();
- }
- #endif
- }
-
- void backlight_set(uint8_t level) {
- if (level > BACKLIGHT_LEVELS) level = BACKLIGHT_LEVELS;
-
- if (level == 0) {
- // Turn backlight off
- pwmDisableChannel(&BACKLIGHT_PWM_DRIVER, BACKLIGHT_PWM_CHANNEL - 1);
- } else {
- // Turn backlight on
- uint32_t duty = (uint32_t)(cie_lightness(rescale_limit_val(0xFFFF * (uint32_t)level / BACKLIGHT_LEVELS)));
- pwmEnableChannel(&BACKLIGHT_PWM_DRIVER, BACKLIGHT_PWM_CHANNEL - 1, PWM_FRACTION_TO_WIDTH(&BACKLIGHT_PWM_DRIVER, 0xFFFF, duty));
- }
- }
-
- void backlight_task(void) {}
-
- #ifdef BACKLIGHT_BREATHING
-
- # define BREATHING_STEPS 128
-
- /* 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};
-
- void breathing_callback(PWMDriver *pwmp);
-
- bool is_breathing(void) { return pwmCFG.callback != NULL; }
-
- void breathing_enable(void) {
- pwmCFG.callback = breathing_callback;
- pwmEnablePeriodicNotification(&BACKLIGHT_PWM_DRIVER);
- }
-
- void breathing_disable(void) {
- pwmCFG.callback = NULL;
- pwmDisablePeriodicNotification(&BACKLIGHT_PWM_DRIVER);
-
- // Restore backlight level
- backlight_set(get_backlight_level());
- }
-
- // Use this before the cie_lightness function.
- static inline uint16_t scale_backlight(uint16_t v) { return v / BACKLIGHT_LEVELS * get_backlight_level(); }
-
- void breathing_callback(PWMDriver *pwmp) {
- uint8_t breathing_period = get_breathing_period();
- uint16_t interval = (uint16_t)breathing_period * 256 / BREATHING_STEPS;
-
- // resetting after one period to prevent ugly reset at overflow.
- static uint16_t breathing_counter = 0;
- breathing_counter = (breathing_counter + 1) % (breathing_period * 256);
- uint8_t index = breathing_counter / interval % BREATHING_STEPS;
- uint32_t duty = cie_lightness(rescale_limit_val(scale_backlight(breathing_table[index] * 256)));
-
- chSysLockFromISR();
- pwmEnableChannelI(pwmp, BACKLIGHT_PWM_CHANNEL - 1, PWM_FRACTION_TO_WIDTH(&BACKLIGHT_PWM_DRIVER, 0xFFFF, duty));
- chSysUnlockFromISR();
- }
-
- // TODO: integrate generic pulse solution
- void breathing_pulse(void) {
- backlight_set(is_backlight_enabled() ? 0 : BACKLIGHT_LEVELS);
- wait_ms(10);
- backlight_set(is_backlight_enabled() ? get_backlight_level() : 0);
- }
-
- #endif
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