164 lines
5.8 KiB
C
164 lines
5.8 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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// Maximum duty cycle limit
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#ifndef BACKLIGHT_LIMIT_VAL
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# define BACKLIGHT_LIMIT_VAL 255
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#endif
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#ifndef BACKLIGHT_PAL_MODE
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# if defined(USE_GPIOV1)
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# define BACKLIGHT_PAL_MODE PAL_MODE_ALTERNATE_PUSHPULL
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# else
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// GPIOV2 && GPIOV3
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# define BACKLIGHT_PAL_MODE 5
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# endif
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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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// Support for pins which are on TIM1_CH1N - requires STM32_PWM_USE_ADVANCED
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#ifdef BACKLIGHT_PWM_COMPLEMENTARY_OUTPUT
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# if BACKLIGHT_ON_STATE == 1
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# define PWM_OUTPUT_MODE PWM_COMPLEMENTARY_OUTPUT_ACTIVE_LOW;
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# else
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# define PWM_OUTPUT_MODE PWM_COMPLEMENTARY_OUTPUT_ACTIVE_HIGH;
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# endif
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#else
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# if BACKLIGHT_ON_STATE == 1
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# define PWM_OUTPUT_MODE PWM_OUTPUT_ACTIVE_HIGH;
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# else
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# define PWM_OUTPUT_MODE PWM_OUTPUT_ACTIVE_LOW;
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# endif
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#endif
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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, /* 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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static uint32_t rescale_limit_val(uint32_t val) {
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// rescale the supplied backlight value to be in terms of the value limit
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return (val * (BACKLIGHT_LIMIT_VAL + 1)) / 256;
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}
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void backlight_init_ports(void) {
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#ifdef USE_GPIOV1
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palSetPadMode(PAL_PORT(BACKLIGHT_PIN), PAL_PAD(BACKLIGHT_PIN), BACKLIGHT_PAL_MODE);
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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_MODE;
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pwmStart(&BACKLIGHT_PWM_DRIVER, &pwmCFG);
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backlight_set(get_backlight_level());
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#ifdef BACKLIGHT_BREATHING
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if (is_backlight_breathing()) {
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breathing_enable();
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}
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#endif
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}
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void backlight_set(uint8_t level) {
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if (level > BACKLIGHT_LEVELS) level = BACKLIGHT_LEVELS;
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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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uint32_t duty = (uint32_t)(cie_lightness(rescale_limit_val(0xFFFF * (uint32_t)level / BACKLIGHT_LEVELS)));
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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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void backlight_task(void) {}
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#ifdef BACKLIGHT_BREATHING
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# define BREATHING_STEPS 128
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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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void breathing_callback(PWMDriver *pwmp);
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bool is_breathing(void) {
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return pwmCFG.callback != NULL;
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}
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void breathing_enable(void) {
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pwmCFG.callback = breathing_callback;
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pwmEnablePeriodicNotification(&BACKLIGHT_PWM_DRIVER);
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}
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void breathing_disable(void) {
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pwmCFG.callback = NULL;
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pwmDisablePeriodicNotification(&BACKLIGHT_PWM_DRIVER);
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// Restore backlight level
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backlight_set(get_backlight_level());
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}
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// Use this before the cie_lightness function.
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static inline uint16_t scale_backlight(uint16_t v) {
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return v / BACKLIGHT_LEVELS * get_backlight_level();
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}
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void breathing_callback(PWMDriver *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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static uint16_t breathing_counter = 0;
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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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uint32_t duty = cie_lightness(rescale_limit_val(scale_backlight(breathing_table[index] * 256)));
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chSysLockFromISR();
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pwmEnableChannelI(pwmp, 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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// TODO: integrate generic pulse solution
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void breathing_pulse(void) {
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backlight_set(is_backlight_enabled() ? 0 : BACKLIGHT_LEVELS);
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wait_ms(10);
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backlight_set(is_backlight_enabled() ? get_backlight_level() : 0);
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}
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#endif
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