#include "quantum.h" #include "backlight.h" #include #include "debug.h" // TODO: remove short term bodge when refactoring BACKLIGHT_CUSTOM_DRIVER out #ifdef BACKLIGHT_PIN // 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_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 = get_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; } /* 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; 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. 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(); } #endif