X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=keyboard%2Fplanck%2Fbacklight.c;h=ee7e31ee9cfdf4d15a3203361759af40874c0557;hb=65680819df13585a563296f008be1a4b0ee8045a;hp=d12dcf2386fa66ed076060335ddc62e2ce82e7f0;hpb=b80b6b369c5ecb5c7232edf1e8cebe8c12078d6e;p=qmk_firmware.git diff --git a/keyboard/planck/backlight.c b/keyboard/planck/backlight.c index d12dcf238..ee7e31ee9 100644 --- a/keyboard/planck/backlight.c +++ b/keyboard/planck/backlight.c @@ -5,42 +5,42 @@ void backlight_init_ports() { - // Setup PB7 as output and output low. - DDRB |= (1<<7); - PORTB &= ~(1<<7); - - // Use full 16-bit resolution. - ICR1 = 0xFFFF; + // Setup PB7 as output and output low. + DDRB |= (1<<7); + PORTB &= ~(1<<7); + + // Use full 16-bit resolution. + ICR1 = 0xFFFF; - // 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 - - TCCR1A = _BV(COM1C1) | _BV(WGM11); // = 0b00001010; - TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001; - - // Default to zero duty cycle. - OCR1C = 0x0000; + // 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 + + TCCR1A = _BV(COM1C1) | _BV(WGM11); // = 0b00001010; + TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001; + + // Default to zero duty cycle. + OCR1C = 0x0000; } void backlight_set(uint8_t level) { - if ( level == 0 ) - { - // Turn off PWM control on PB7, revert to output low. - TCCR1A &= ~(_BV(COM1C1)); - } - else - { - // Turn on PWM control of PB7 - TCCR1A |= _BV(COM1C1); - OCR1C = level << 12 | 0x0FFF; - } + if ( level == 0 ) + { + // Turn off PWM control on PB7, revert to output low. + TCCR1A &= ~(_BV(COM1C1)); + } + else + { + // Turn on PWM control of PB7 + TCCR1A |= _BV(COM1C1); + OCR1C = level << 12 | 0x0FFF; + } }