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Diffstat (limited to 'keyboards/handwired/co60/rev6/led.c')
| -rw-r--r-- | keyboards/handwired/co60/rev6/led.c | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/keyboards/handwired/co60/rev6/led.c b/keyboards/handwired/co60/rev6/led.c new file mode 100644 index 000000000..fe28ce2e8 --- /dev/null +++ b/keyboards/handwired/co60/rev6/led.c @@ -0,0 +1,240 @@ +/* +Copyright 2012 Jun Wako <wakojun@gmail.com> + +This program is free software: you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation, either version 2 of the License, or +(at your option) any later version. + +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +#include "hal.h" +#include "led_custom.h" +#include "rev6.h" +#include "printf.h" + +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 */ + { + {PWM_OUTPUT_DISABLED, NULL}, + {PWM_OUTPUT_DISABLED, NULL}, + {PWM_OUTPUT_ACTIVE_HIGH, NULL}, /* Enable Channel 3 */ + {PWM_OUTPUT_DISABLED, NULL} + }, + 0, /* HW dependent part.*/ + 0 +}; + +static PWMConfig pwmCFG_breathing = { + 0xFFFF, /* 10kHz PWM clock frequency */ + 256, /* PWM period (in ticks) 1S (1/10kHz=0.1mS 0.1ms*10000 ticks=1S) */ + breathing_callback, /* Breathing Callback */ + { + {PWM_OUTPUT_DISABLED, NULL}, + {PWM_OUTPUT_DISABLED, NULL}, + {PWM_OUTPUT_ACTIVE_HIGH, NULL}, /* Enable Channel 3 */ + {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) { + palSetPadMode(GPIOB, 8, PAL_MODE_ALTERNATE(2)); + pwmStart(&PWMD4, &pwmCFG); + if (kb_backlight_config.enable) { + if (kb_backlight_config.breathing) { + breathing_enable(); + } else { + backlight_set(kb_backlight_config.level); + } + } else { + backlight_set(0); + } +} + +void backlight_set(uint8_t level) { + uint32_t duty = (uint32_t)(cie_lightness(0xFFFF * (uint32_t)level / BACKLIGHT_LEVELS)); + if (level == 0) { + // Turn backlight off + // Disable channel 3 on PWM4 + pwmDisableChannel(&PWMD4, 2); + } else { + // Turn backlight on + if (!is_breathing()) { + // Enable channel 3 on PWM4 + pwmEnableChannel(&PWMD4, 2, PWM_FRACTION_TO_WIDTH(&PWMD4, 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_period = BREATHING_PERIOD; +static uint8_t breathing_halt = BREATHING_NO_HALT; +static uint16_t breathing_counter = 0; + +bool is_breathing(void) { + return PWMD4.config == &pwmCFG_breathing; +} + +#define breathing_min() do {breathing_counter = 0;} while (0) +#define breathing_max() do {breathing_counter = breathing_period * 256 / 2;} while (0) + + +void breathing_interrupt_enable(void){ + pwmStop(&PWMD4); + pwmStart(&PWMD4, &pwmCFG_breathing); + chSysLockFromISR(); + pwmEnablePeriodicNotification(&PWMD4); + pwmEnableChannelI( + &PWMD4, + 2, + PWM_FRACTION_TO_WIDTH( + &PWMD4, + 0xFFFF, + 0xFFFF + ) + ); + chSysUnlockFromISR(); +} + +void breathing_interrupt_disable(void){ + pwmStop(&PWMD4); + pwmStart(&PWMD4, &pwmCFG); +} + +void breathing_enable(void) +{ + breathing_counter = 0; + breathing_halt = BREATHING_NO_HALT; + breathing_interrupt_enable(); +} + +void breathing_pulse(void) +{ + if (kb_backlight_config.level == 0) + breathing_min(); + else + breathing_max(); + breathing_halt = BREATHING_HALT_ON; + breathing_interrupt_enable(); +} + +void breathing_disable(void) +{ + breathing_interrupt_disable(); + // Restore backlight level + backlight_set(kb_backlight_config.level); +} + +void breathing_self_disable(void) +{ + if (kb_backlight_config.level == 0) + breathing_halt = BREATHING_HALT_OFF; + else + breathing_halt = BREATHING_HALT_ON; +} + +void breathing_toggle(void) { + if (is_breathing()){ + breathing_disable(); + } else { + breathing_enable(); + } +} + +void breathing_period_set(uint8_t value) +{ + if (!value) + value = 1; + breathing_period = value; +} + +void breathing_period_default(void) { + breathing_period_set(BREATHING_PERIOD); +} + +void breathing_period_inc(void) +{ + breathing_period_set(breathing_period+1); +} + +void breathing_period_dec(void) +{ + breathing_period_set(breathing_period-1); +} + +/* 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 * kb_backlight_config.level; +} + +static void breathing_callback(PWMDriver *pwmp) +{ + (void)pwmp; + 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( + &PWMD4, + 2, + PWM_FRACTION_TO_WIDTH( + &PWMD4, + 0xFFFF, + duty + ) + ); + chSysUnlockFromISR(); +} |