195 lines
7.4 KiB
C
195 lines
7.4 KiB
C
#include "quantum.h"
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#include "backlight.h"
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#include <hal.h>
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#include "debug.h"
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// TODO: remove short term bodge when refactoring BACKLIGHT_CUSTOM_DRIVER out
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#ifdef BACKLIGHT_PIN
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# if defined(STM32F0XX) || defined(STM32F0xx)
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# error "Backlight support for STMF072 is not available. Please disable."
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# endif
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// GPIOV2 && GPIOV3
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# ifndef BACKLIGHT_PAL_MODE
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# define BACKLIGHT_PAL_MODE 2
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# endif
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// GENERIC
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# ifndef BACKLIGHT_PWM_DRIVER
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# define BACKLIGHT_PWM_DRIVER PWMD4
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# endif
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# ifndef BACKLIGHT_PWM_CHANNEL
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# define BACKLIGHT_PWM_CHANNEL 3
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# endif
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static void breathing_callback(PWMDriver *pwmp);
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static PWMConfig pwmCFG = {0xFFFF, /* PWM clock frequency */
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256, /* PWM period (in ticks) 1S (1/10kHz=0.1mS 0.1ms*10000 ticks=1S) */
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NULL, /* No Callback */
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{ /* Default all channels to disabled - Channels will be configured durring init */
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{PWM_OUTPUT_DISABLED, NULL},
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{PWM_OUTPUT_DISABLED, NULL},
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{PWM_OUTPUT_DISABLED, NULL},
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{PWM_OUTPUT_DISABLED, NULL}},
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0, /* HW dependent part.*/
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0};
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static PWMConfig pwmCFG_breathing = {0xFFFF, /** PWM clock frequency */
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256, /* PWM period (in ticks) 1S (1/10kHz=0.1mS 0.1ms*10000 ticks=1S) */
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breathing_callback, /* Breathing Callback */
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{ /* Default all channels to disabled - Channels will be configured durring init */
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{PWM_OUTPUT_DISABLED, NULL},
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{PWM_OUTPUT_DISABLED, NULL},
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{PWM_OUTPUT_DISABLED, NULL},
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{PWM_OUTPUT_DISABLED, NULL}},
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0, /* HW dependent part.*/
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0};
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// See http://jared.geek.nz/2013/feb/linear-led-pwm
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static uint16_t cie_lightness(uint16_t v) {
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if (v <= 5243) // if below 8% of max
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return v / 9; // same as dividing by 900%
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else {
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uint32_t y = (((uint32_t)v + 10486) << 8) / (10486 + 0xFFFFUL); // add 16% of max and compare
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// to get a useful result with integer division, we shift left in the expression above
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// and revert what we've done again after squaring.
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y = y * y * y >> 8;
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if (y > 0xFFFFUL) // prevent overflow
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return 0xFFFFU;
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else
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return (uint16_t)y;
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}
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}
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void backlight_init_ports(void) {
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// printf("backlight_init_ports()\n");
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# ifdef USE_GPIOV1
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palSetPadMode(PAL_PORT(BACKLIGHT_PIN), PAL_PAD(BACKLIGHT_PIN), PAL_MODE_STM32_ALTERNATE_PUSHPULL);
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# else
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palSetPadMode(PAL_PORT(BACKLIGHT_PIN), PAL_PAD(BACKLIGHT_PIN), PAL_MODE_ALTERNATE(BACKLIGHT_PAL_MODE));
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# endif
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pwmCFG.channels[BACKLIGHT_PWM_CHANNEL - 1].mode = PWM_OUTPUT_ACTIVE_HIGH;
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pwmCFG_breathing.channels[BACKLIGHT_PWM_CHANNEL - 1].mode = PWM_OUTPUT_ACTIVE_HIGH;
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pwmStart(&BACKLIGHT_PWM_DRIVER, &pwmCFG);
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backlight_set(get_backlight_level());
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if (is_backlight_breathing()) {
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breathing_enable();
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}
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}
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void backlight_set(uint8_t level) {
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// printf("backlight_set(%d)\n", level);
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if (level == 0) {
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// Turn backlight off
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pwmDisableChannel(&BACKLIGHT_PWM_DRIVER, BACKLIGHT_PWM_CHANNEL - 1);
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} else {
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// Turn backlight on
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if (!is_breathing()) {
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uint32_t duty = (uint32_t)(cie_lightness(0xFFFF * (uint32_t)level / BACKLIGHT_LEVELS));
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// printf("duty: (%d)\n", duty);
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pwmEnableChannel(&BACKLIGHT_PWM_DRIVER, BACKLIGHT_PWM_CHANNEL - 1, PWM_FRACTION_TO_WIDTH(&BACKLIGHT_PWM_DRIVER, 0xFFFF, duty));
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}
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}
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}
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uint8_t backlight_tick = 0;
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void backlight_task(void) {}
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# define BREATHING_NO_HALT 0
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# define BREATHING_HALT_OFF 1
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# define BREATHING_HALT_ON 2
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# define BREATHING_STEPS 128
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static uint8_t breathing_halt = BREATHING_NO_HALT;
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static uint16_t breathing_counter = 0;
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bool is_breathing(void) { return BACKLIGHT_PWM_DRIVER.config == &pwmCFG_breathing; }
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static inline void breathing_min(void) { breathing_counter = 0; }
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static inline void breathing_max(void) { breathing_counter = get_breathing_period() * 256 / 2; }
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void breathing_interrupt_enable(void) {
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pwmStop(&BACKLIGHT_PWM_DRIVER);
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pwmStart(&BACKLIGHT_PWM_DRIVER, &pwmCFG_breathing);
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chSysLockFromISR();
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pwmEnablePeriodicNotification(&BACKLIGHT_PWM_DRIVER);
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pwmEnableChannelI(&BACKLIGHT_PWM_DRIVER, BACKLIGHT_PWM_CHANNEL - 1, PWM_FRACTION_TO_WIDTH(&BACKLIGHT_PWM_DRIVER, 0xFFFF, 0xFFFF));
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chSysUnlockFromISR();
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}
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void breathing_interrupt_disable(void) {
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pwmStop(&BACKLIGHT_PWM_DRIVER);
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pwmStart(&BACKLIGHT_PWM_DRIVER, &pwmCFG);
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}
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void breathing_enable(void) {
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breathing_counter = 0;
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breathing_halt = BREATHING_NO_HALT;
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breathing_interrupt_enable();
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}
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void breathing_pulse(void) {
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if (get_backlight_level() == 0)
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breathing_min();
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else
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breathing_max();
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breathing_halt = BREATHING_HALT_ON;
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breathing_interrupt_enable();
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}
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void breathing_disable(void) {
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// printf("breathing_disable()\n");
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breathing_interrupt_disable();
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// Restore backlight level
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backlight_set(get_backlight_level());
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}
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void breathing_self_disable(void) {
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if (get_backlight_level() == 0)
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breathing_halt = BREATHING_HALT_OFF;
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else
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breathing_halt = BREATHING_HALT_ON;
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}
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void breathing_toggle(void) {
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if (is_breathing())
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breathing_disable();
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else
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breathing_enable();
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}
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/* To generate breathing curve in python:
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* from math import sin, pi; [int(sin(x/128.0*pi)**4*255) for x in range(128)]
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*/
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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};
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// Use this before the cie_lightness function.
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static inline uint16_t scale_backlight(uint16_t v) { return v / BACKLIGHT_LEVELS * get_backlight_level(); }
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static void breathing_callback(PWMDriver *pwmp) {
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(void)pwmp;
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uint8_t breathing_period = get_breathing_period();
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uint16_t interval = (uint16_t)breathing_period * 256 / BREATHING_STEPS;
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// resetting after one period to prevent ugly reset at overflow.
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breathing_counter = (breathing_counter + 1) % (breathing_period * 256);
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uint8_t index = breathing_counter / interval % BREATHING_STEPS;
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if (((breathing_halt == BREATHING_HALT_ON) && (index == BREATHING_STEPS / 2)) || ((breathing_halt == BREATHING_HALT_OFF) && (index == BREATHING_STEPS - 1))) {
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breathing_interrupt_disable();
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}
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uint32_t duty = cie_lightness(scale_backlight(breathing_table[index] * 256));
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chSysLockFromISR();
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pwmEnableChannelI(&BACKLIGHT_PWM_DRIVER, BACKLIGHT_PWM_CHANNEL - 1, PWM_FRACTION_TO_WIDTH(&BACKLIGHT_PWM_DRIVER, 0xFFFF, duty));
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chSysUnlockFromISR();
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}
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#endif
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