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242 lines
6.7 KiB
242 lines
6.7 KiB
/*
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Copyright 2012 Jun Wako <wakojun@gmail.com>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "hal.h"
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#include "led_custom.h"
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#include "rev7.h"
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#include "printf.h"
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static void breathing_callback(PWMDriver *pwmp);
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static PWMConfig pwmCFG = {
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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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{
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{PWM_OUTPUT_DISABLED, NULL},
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{PWM_OUTPUT_DISABLED, NULL},
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{PWM_OUTPUT_ACTIVE_HIGH, NULL}, /* Enable Channel 3 */
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{PWM_OUTPUT_DISABLED, NULL}
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},
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0, /* HW dependent part.*/
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0
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};
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static PWMConfig pwmCFG_breathing = {
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0xFFFF, /* 10kHz 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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{
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{PWM_OUTPUT_DISABLED, NULL},
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{PWM_OUTPUT_DISABLED, NULL},
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{PWM_OUTPUT_ACTIVE_HIGH, NULL}, /* Enable Channel 3 */
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{PWM_OUTPUT_DISABLED, NULL}
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},
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0, /* HW dependent part.*/
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0
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};
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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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palSetPadMode(GPIOB, 8, PAL_MODE_ALTERNATE(2));
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pwmStart(&PWMD4, &pwmCFG);
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if(kb_backlight_config.enable){
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if(kb_backlight_config.breathing){
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breathing_enable();
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} else{
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backlight_set(kb_backlight_config.level);
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}
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} else {
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backlight_set(0);
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}
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}
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void backlight_set(uint8_t level) {
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uint32_t duty = (uint32_t)(cie_lightness(0xFFFF * (uint32_t) level / BACKLIGHT_LEVELS));
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if (level == 0) {
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// Turn backlight off
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// Disable channel 3 on PWM4
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pwmDisableChannel(&PWMD4, 2);
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} else {
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// Turn backlight on
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if(!is_breathing()){
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// Enable channel 3 on PWM4
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pwmEnableChannel(&PWMD4, 2, PWM_FRACTION_TO_WIDTH(&PWMD4,0xFFFF,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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}
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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_period = BREATHING_PERIOD;
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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) {
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return PWMD4.config == &pwmCFG_breathing;
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}
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#define breathing_min() do {breathing_counter = 0;} while (0)
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#define breathing_max() do {breathing_counter = breathing_period * 256 / 2;} while (0)
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void breathing_interrupt_enable(void){
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pwmStop(&PWMD4);
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pwmStart(&PWMD4, &pwmCFG_breathing);
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chSysLockFromISR();
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pwmEnablePeriodicNotification(&PWMD4);
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pwmEnableChannelI(
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&PWMD4,
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2,
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PWM_FRACTION_TO_WIDTH(
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&PWMD4,
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0xFFFF,
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0xFFFF
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)
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);
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chSysUnlockFromISR();
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}
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void breathing_interrupt_disable(void){
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pwmStop(&PWMD4);
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pwmStart(&PWMD4, &pwmCFG);
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}
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void breathing_enable(void)
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{
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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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{
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if (kb_backlight_config.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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{
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breathing_interrupt_disable();
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// Restore backlight level
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backlight_set(kb_backlight_config.level);
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}
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void breathing_self_disable(void)
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{
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if (kb_backlight_config.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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}
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void breathing_period_set(uint8_t value)
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{
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if (!value)
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value = 1;
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breathing_period = value;
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}
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void breathing_period_default(void) {
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breathing_period_set(BREATHING_PERIOD);
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}
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void breathing_period_inc(void)
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{
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breathing_period_set(breathing_period+1);
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}
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void breathing_period_dec(void)
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{
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breathing_period_set(breathing_period-1);
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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) {
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return v / BACKLIGHT_LEVELS * kb_backlight_config.level;
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}
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static void breathing_callback(PWMDriver *pwmp)
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{
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(void)pwmp;
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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)) ||
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((breathing_halt == BREATHING_HALT_OFF) && (index == BREATHING_STEPS - 1)))
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{
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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(
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&PWMD4,
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2,
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PWM_FRACTION_TO_WIDTH(
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&PWMD4,
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0xFFFF,
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duty
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)
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);
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chSysUnlockFromISR();
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}
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