diff options
Diffstat (limited to 'keyboards/bface/backlight_ps2avrGB.c')
| -rw-r--r-- | keyboards/bface/backlight_ps2avrGB.c | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/keyboards/bface/backlight_ps2avrGB.c b/keyboards/bface/backlight_ps2avrGB.c new file mode 100644 index 0000000000..c0f6428407 --- /dev/null +++ b/keyboards/bface/backlight_ps2avrGB.c @@ -0,0 +1,94 @@ +/* Copyright 2017 Sebastian Kaim + * + * 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/>. + */ + +#ifdef BACKLIGHT_ENABLE + +#include "backlight_ps2avrGB.h" +#define sbi(reg,bit) reg |= (_BV(bit)) +#define cbi(reg,bit) reg &= (~_BV(bit)) +#define PWM10 WGM10 +#define PWM11 WGM11 +#define COM1x1 COM1B1 +#define OCR1x OCR1B + +void backlight_init_ports(void) +{ +#if BACKLIGHT_ON_STATE == 0 + backlight_off(); +#else + backlight_on(); +#endif + + // setup pwm + // this bitmagic is sourced from the original firmware + /*TCCR1B = ((TCCR1B & ~0x07) | 0x03); + TCNT1H = 0; + TCNT1L = 0; + sbi(TIMSK, TOIE1); + OCR1BH = 0; + OCR1BL = 0; + cbi(TCCR1A,PWM11); + sbi(TCCR1A,PWM10); + sbi(TCCR1A,COM1B1); + cbi(TCCR1A,COM1B0);*/ + ICR1 = 0xFFFF; + + TCCR1A = _BV(COM1x1) | _BV(WGM11); // = 0b00001010; + TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001; + + backlight_init(); +} + +void backlight_set(uint8_t level) +{ + if( level == 0 ) { + backlight_off(); + } + else { + backlight_on(); + /*uint8_t pwm = get_pwm_for_brightness(level); + set_backlight_pwm(pwm); + TCCR1A |= _BV(COM1x1); + OCR1x = (level >= 2) ? 0xFFFF : 0x00FF;*/ + } +} + +#define PWM_MAX 0xFF +uint8_t get_pwm_for_brightness(uint8_t level) +{ + // we need to cast up here to allow multiplication with 0xFF. We could also use floats, but this is probably a lot faster. + uint16_t brightness = (uint16_t)level * (uint16_t)PWM_MAX / (uint16_t)BACKLIGHT_LEVELS; + return (uint8_t)brightness; +} + +void backlight_on(void) +{ + //_SFR_IO8(0x12) |= _BV(0x4); + LED_PIN |= BACKLIGHT_PORT_NUM; +} + +void backlight_off(void) +{ + //_SFR_IO8(0x12) &= ~_BV(0x4); + LED_PIN &= ~BACKLIGHT_PORT_NUM; +} + +void set_backlight_pwm(uint8_t level) { + // this does not work (yet) + //OCR1B = level; +} + +#endif // BACKLIGHT_ENABLE |