backlight breathing overhaul (#2187)
* add breathing to bananasplit * backlight breathing overhaul * fix the backlight_tick thing. * fix for vision_division backlight * fix a few keymaps and probably break breathing for some weirdly set-up boards. * remove BL_x keycodes because they made unreasonable assumptions * some fixes for BL keycodes * integer cie lightness scaling * use cie lightness for non-breathing backlight and make breathing able to reach true max brightness
This commit is contained in:
Balz Guenat
Jack Humbert
parent
d6215ad6af
commit
4931510ad3
25 changed files with 285 additions and 329 deletions
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@ -23,6 +23,10 @@
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#define TAPPING_TERM 200
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#endif
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#ifndef BREATHING_PERIOD
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#define BREATHING_PERIOD 6
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#endif
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#include "backlight.h"
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extern backlight_config_t backlight_config;
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@ -618,7 +622,17 @@ bool process_record_quantum(keyrecord_t *record) {
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}
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send_keyboard_report();
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return false;
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}
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#if defined(BACKLIGHT_ENABLE) && defined(BACKLIGHT_BREATHING)
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case BL_BRTG: {
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if (record->event.pressed)
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breathing_toggle();
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return false;
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}
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#endif
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default: {
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shift_interrupted[0] = true;
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shift_interrupted[1] = true;
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@ -831,6 +845,7 @@ void matrix_scan_quantum() {
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static const uint8_t backlight_pin = BACKLIGHT_PIN;
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// depending on the pin, we use a different output compare unit
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#if BACKLIGHT_PIN == B7
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# define COM1x1 COM1C1
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# define OCR1x OCR1C
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@ -841,17 +856,18 @@ static const uint8_t backlight_pin = BACKLIGHT_PIN;
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# define COM1x1 COM1A1
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# define OCR1x OCR1A
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#else
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# define NO_BACKLIGHT_CLOCK
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# define NO_HARDWARE_PWM
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#endif
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#ifndef BACKLIGHT_ON_STATE
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#define BACKLIGHT_ON_STATE 0
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#endif
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#ifdef NO_HARDWARE_PWM // pwm through software
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__attribute__ ((weak))
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void backlight_init_ports(void)
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{
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// Setup backlight pin as output and output to on state.
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// DDRx |= n
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_SFR_IO8((backlight_pin >> 4) + 1) |= _BV(backlight_pin & 0xF);
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@ -862,83 +878,15 @@ void backlight_init_ports(void)
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// PORTx |= n
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_SFR_IO8((backlight_pin >> 4) + 2) |= _BV(backlight_pin & 0xF);
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#endif
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#ifndef NO_BACKLIGHT_CLOCK
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// Use full 16-bit resolution.
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ICR1 = 0xFFFF;
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// I could write a wall of text here to explain... but TL;DW
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// Go read the ATmega32u4 datasheet.
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// And this: http://blog.saikoled.com/post/43165849837/secret-konami-cheat-code-to-high-resolution-pwm-on
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// Pin PB7 = OCR1C (Timer 1, Channel C)
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// Compare Output Mode = Clear on compare match, Channel C = COM1C1=1 COM1C0=0
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// (i.e. start high, go low when counter matches.)
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// WGM Mode 14 (Fast PWM) = WGM13=1 WGM12=1 WGM11=1 WGM10=0
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// Clock Select = clk/1 (no prescaling) = CS12=0 CS11=0 CS10=1
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TCCR1A = _BV(COM1x1) | _BV(WGM11); // = 0b00001010;
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TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001;
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#endif
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backlight_init();
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#ifdef BACKLIGHT_BREATHING
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breathing_defaults();
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#endif
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}
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__attribute__ ((weak))
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void backlight_set(uint8_t level)
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{
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// Prevent backlight blink on lowest level
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// #if BACKLIGHT_ON_STATE == 0
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// // PORTx &= ~n
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// _SFR_IO8((backlight_pin >> 4) + 2) &= ~_BV(backlight_pin & 0xF);
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// #else
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// // PORTx |= n
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// _SFR_IO8((backlight_pin >> 4) + 2) |= _BV(backlight_pin & 0xF);
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// #endif
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if ( level == 0 ) {
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#ifndef NO_BACKLIGHT_CLOCK
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// Turn off PWM control on backlight pin, revert to output low.
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TCCR1A &= ~(_BV(COM1x1));
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OCR1x = 0x0;
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#else
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// #if BACKLIGHT_ON_STATE == 0
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// // PORTx |= n
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// _SFR_IO8((backlight_pin >> 4) + 2) |= _BV(backlight_pin & 0xF);
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// #else
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// // PORTx &= ~n
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// _SFR_IO8((backlight_pin >> 4) + 2) &= ~_BV(backlight_pin & 0xF);
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// #endif
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#endif
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}
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#ifndef NO_BACKLIGHT_CLOCK
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else if ( level == BACKLIGHT_LEVELS ) {
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// Turn on PWM control of backlight pin
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TCCR1A |= _BV(COM1x1);
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// Set the brightness
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OCR1x = 0xFFFF;
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}
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else {
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// Turn on PWM control of backlight pin
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TCCR1A |= _BV(COM1x1);
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// Set the brightness
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OCR1x = 0xFFFF >> ((BACKLIGHT_LEVELS - level) * ((BACKLIGHT_LEVELS + 1) / 2));
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}
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#endif
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#ifdef BACKLIGHT_BREATHING
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breathing_intensity_default();
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#endif
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}
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void backlight_set(uint8_t level) {}
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uint8_t backlight_tick = 0;
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void backlight_task(void) {
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#ifdef NO_BACKLIGHT_CLOCK
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if ((0xFFFF >> ((BACKLIGHT_LEVELS - backlight_config.level) * ((BACKLIGHT_LEVELS + 1) / 2))) & (1 << backlight_tick)) {
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if ((0xFFFF >> ((BACKLIGHT_LEVELS - get_backlight_level()) * ((BACKLIGHT_LEVELS + 1) / 2))) & (1 << backlight_tick)) {
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#if BACKLIGHT_ON_STATE == 0
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// PORTx &= ~n
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_SFR_IO8((backlight_pin >> 4) + 2) &= ~_BV(backlight_pin & 0xF);
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@ -955,232 +903,216 @@ void backlight_task(void) {
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_SFR_IO8((backlight_pin >> 4) + 2) &= ~_BV(backlight_pin & 0xF);
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#endif
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}
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backlight_tick = (backlight_tick + 1) % 16;
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#endif
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backlight_tick = backlight_tick + 1 % 16;
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}
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#ifdef BACKLIGHT_BREATHING
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#error "Backlight breathing only available with hardware PWM. Please disable."
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#endif
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#ifdef NO_BACKLIGHT_CLOCK
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void breathing_defaults(void) {}
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void breathing_intensity_default(void) {}
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#else
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#else // pwm through timer
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#define TIMER_TOP 0xFFFFU
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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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// range for val is [0..TIMER_TOP]. PWM pin is high while the timer count is below val.
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static inline void set_pwm(uint16_t val) {
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OCR1x = val;
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}
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__attribute__ ((weak))
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void backlight_set(uint8_t level) {
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if (level > BACKLIGHT_LEVELS)
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level = BACKLIGHT_LEVELS;
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if (level == 0) {
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// Turn off PWM control on backlight pin
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TCCR1A &= ~(_BV(COM1x1));
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} else {
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// Turn on PWM control of backlight pin
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TCCR1A |= _BV(COM1x1);
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}
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// Set the brightness
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set_pwm(cie_lightness(TIMER_TOP * (uint32_t)level / BACKLIGHT_LEVELS));
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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_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 breath_intensity;
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static uint8_t breath_speed;
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static uint16_t breathing_index;
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static uint8_t breathing_halt;
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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 !!(TIMSK1 & _BV(TOIE1));
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}
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#define breathing_interrupt_enable() do {TIMSK1 |= _BV(TOIE1);} while (0)
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#define breathing_interrupt_disable() do {TIMSK1 &= ~_BV(TOIE1);} while (0)
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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 * 244 / 2;} while (0)
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void breathing_enable(void)
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{
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if (get_backlight_level() == 0)
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{
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breathing_index = 0;
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}
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else
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{
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// Set breathing_index to be at the midpoint (brightest point)
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breathing_index = 0x20 << breath_speed;
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}
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breathing_halt = BREATHING_NO_HALT;
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// Enable breathing interrupt
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TIMSK1 |= _BV(OCIE1A);
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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 (get_backlight_level() == 0)
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{
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breathing_index = 0;
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}
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breathing_min();
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else
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{
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// Set breathing_index to be at the midpoint + 1 (brightest point)
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breathing_index = 0x21 << breath_speed;
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}
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breathing_max();
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breathing_halt = BREATHING_HALT_ON;
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// Enable breathing interrupt
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TIMSK1 |= _BV(OCIE1A);
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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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// Disable breathing interrupt
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TIMSK1 &= ~_BV(OCIE1A);
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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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{
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if (get_backlight_level() == 0)
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{
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breathing_halt = BREATHING_HALT_OFF;
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}
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else
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{
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breathing_halt = BREATHING_HALT_ON;
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}
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//backlight_set(get_backlight_level());
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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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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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void breathing_period_set(uint8_t value)
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{
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if (!is_breathing())
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{
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if (get_backlight_level() == 0)
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{
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breathing_index = 0;
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}
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else
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{
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// Set breathing_index to be at the midpoint + 1 (brightest point)
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breathing_index = 0x21 << breath_speed;
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}
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breathing_halt = BREATHING_NO_HALT;
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}
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// Toggle breathing interrupt
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TIMSK1 ^= _BV(OCIE1A);
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// Restore backlight level
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if (!is_breathing())
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{
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backlight_set(get_backlight_level());
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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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bool is_breathing(void)
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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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return (TIMSK1 && _BV(OCIE1A));
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breathing_period_set(breathing_period+1);
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}
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void breathing_intensity_default(void)
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void breathing_period_dec(void)
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{
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//breath_intensity = (uint8_t)((uint16_t)100 * (uint16_t)get_backlight_level() / (uint16_t)BACKLIGHT_LEVELS);
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breath_intensity = ((BACKLIGHT_LEVELS - get_backlight_level()) * ((BACKLIGHT_LEVELS + 1) / 2));
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breathing_period_set(breathing_period-1);
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}
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void breathing_intensity_set(uint8_t value)
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{
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breath_intensity = value;
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}
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void breathing_speed_default(void)
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{
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breath_speed = 4;
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}
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void breathing_speed_set(uint8_t value)
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{
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bool is_breathing_now = is_breathing();
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uint8_t old_breath_speed = breath_speed;
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if (is_breathing_now)
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{
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// Disable breathing interrupt
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TIMSK1 &= ~_BV(OCIE1A);
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}
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breath_speed = value;
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if (is_breathing_now)
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{
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// Adjust index to account for new speed
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breathing_index = (( (uint8_t)( (breathing_index) >> old_breath_speed ) ) & 0x3F) << breath_speed;
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// Enable breathing interrupt
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TIMSK1 |= _BV(OCIE1A);
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}
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}
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void breathing_speed_inc(uint8_t value)
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{
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if ((uint16_t)(breath_speed - value) > 10 )
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{
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breathing_speed_set(0);
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}
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else
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{
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breathing_speed_set(breath_speed - value);
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}
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}
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void breathing_speed_dec(uint8_t value)
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{
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if ((uint16_t)(breath_speed + value) > 10 )
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{
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breathing_speed_set(10);
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}
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else
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{
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breathing_speed_set(breath_speed + value);
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}
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}
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void breathing_defaults(void)
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{
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breathing_intensity_default();
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breathing_speed_default();
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breathing_halt = BREATHING_NO_HALT;
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}
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/* Breathing Sleep LED brighness(PWM On period) table
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* (64[steps] * 4[duration]) / 64[PWM periods/s] = 4 second breath cycle
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*
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* http://www.wolframalpha.com/input/?i=%28sin%28+x%2F64*pi%29**8+*+255%2C+x%3D0+to+63
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* (0..63).each {|x| p ((sin(x/64.0*PI)**8)*255).to_i }
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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[64] PROGMEM = {
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 4, 6, 10,
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15, 23, 32, 44, 58, 74, 93, 113, 135, 157, 179, 199, 218, 233, 245, 252,
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255, 252, 245, 233, 218, 199, 179, 157, 135, 113, 93, 74, 58, 44, 32, 23,
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15, 10, 6, 4, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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};
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ISR(TIMER1_COMPA_vect)
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{
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// OCR1x = (pgm_read_byte(&breathing_table[ ( (uint8_t)( (breathing_index++) >> breath_speed ) ) & 0x3F ] )) * breath_intensity;
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uint8_t local_index = ( (uint8_t)( (breathing_index++) >> breath_speed ) ) & 0x3F;
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if (((breathing_halt == BREATHING_HALT_ON) && (local_index == 0x20)) || ((breathing_halt == BREATHING_HALT_OFF) && (local_index == 0x3F)))
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{
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// Disable breathing interrupt
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TIMSK1 &= ~_BV(OCIE1A);
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}
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OCR1x = (uint16_t)(((uint16_t)pgm_read_byte(&breathing_table[local_index]) * 257)) >> breath_intensity;
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static const uint8_t breathing_table[BREATHING_STEPS] PROGMEM = {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();
|
||||
}
|
||||
|
||||
#endif // NO_BACKLIGHT_CLOCK
|
||||
#endif // breathing
|
||||
/* Assuming a 16MHz CPU clock and a timer that resets at 64k (ICR1), the following interrupt handler will run
|
||||
* about 244 times per second.
|
||||
*/
|
||||
ISR(TIMER1_OVF_vect)
|
||||
{
|
||||
uint16_t interval = (uint16_t) breathing_period * 244 / BREATHING_STEPS;
|
||||
// resetting after one period to prevent ugly reset at overflow.
|
||||
breathing_counter = (breathing_counter + 1) % (breathing_period * 244);
|
||||
uint8_t index = breathing_counter / interval % BREATHING_STEPS;
|
||||
|
||||
#else // backlight
|
||||
if (((breathing_halt == BREATHING_HALT_ON) && (index == BREATHING_STEPS / 2)) ||
|
||||
((breathing_halt == BREATHING_HALT_OFF) && (index == BREATHING_STEPS - 1)))
|
||||
{
|
||||
breathing_interrupt_disable();
|
||||
}
|
||||
|
||||
set_pwm(cie_lightness(scale_backlight((uint16_t) pgm_read_byte(&breathing_table[index]) * 0x0101U)));
|
||||
}
|
||||
|
||||
#endif // BACKLIGHT_BREATHING
|
||||
|
||||
__attribute__ ((weak))
|
||||
void backlight_init_ports(void)
|
||||
{
|
||||
// Setup backlight pin as output and output to on state.
|
||||
// DDRx |= n
|
||||
_SFR_IO8((backlight_pin >> 4) + 1) |= _BV(backlight_pin & 0xF);
|
||||
#if BACKLIGHT_ON_STATE == 0
|
||||
// PORTx &= ~n
|
||||
_SFR_IO8((backlight_pin >> 4) + 2) &= ~_BV(backlight_pin & 0xF);
|
||||
#else
|
||||
// PORTx |= n
|
||||
_SFR_IO8((backlight_pin >> 4) + 2) |= _BV(backlight_pin & 0xF);
|
||||
#endif
|
||||
// I could write a wall of text here to explain... but TL;DW
|
||||
// Go read the ATmega32u4 datasheet.
|
||||
// And this: http://blog.saikoled.com/post/43165849837/secret-konami-cheat-code-to-high-resolution-pwm-on
|
||||
|
||||
// Pin PB7 = OCR1C (Timer 1, Channel C)
|
||||
// Compare Output Mode = Clear on compare match, Channel C = COM1C1=1 COM1C0=0
|
||||
// (i.e. start high, go low when counter matches.)
|
||||
// WGM Mode 14 (Fast PWM) = WGM13=1 WGM12=1 WGM11=1 WGM10=0
|
||||
// Clock Select = clk/1 (no prescaling) = CS12=0 CS11=0 CS10=1
|
||||
|
||||
/*
|
||||
14.8.3:
|
||||
"In fast PWM mode, the compare units allow generation of PWM waveforms on the OCnx pins. Setting the COMnx1:0 bits to two will produce a non-inverted PWM [..]."
|
||||
"In fast PWM mode the counter is incremented until the counter value matches either one of the fixed values 0x00FF, 0x01FF, or 0x03FF (WGMn3:0 = 5, 6, or 7), the value in ICRn (WGMn3:0 = 14), or the value in OCRnA (WGMn3:0 = 15)."
|
||||
*/
|
||||
|
||||
TCCR1A = _BV(COM1x1) | _BV(WGM11); // = 0b00001010;
|
||||
TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001;
|
||||
// Use full 16-bit resolution. Counter counts to ICR1 before reset to 0.
|
||||
ICR1 = TIMER_TOP;
|
||||
|
||||
backlight_init();
|
||||
#ifdef BACKLIGHT_BREATHING
|
||||
breathing_enable();
|
||||
#endif
|
||||
}
|
||||
|
||||
#endif // NO_HARDWARE_PWM
|
||||
|
||||
#else // backlight
|
||||
|
||||
__attribute__ ((weak))
|
||||
void backlight_set(uint8_t level)
|
||||
{
|
||||
void backlight_init_ports(void) {}
|
||||
|
||||
}
|
||||
__attribute__ ((weak))
|
||||
void backlight_set(uint8_t level) {}
|
||||
|
||||
#endif // backlight
|
||||
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue