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Diffstat (limited to 'keyboard/jd45/backlight.c')
| -rw-r--r-- | keyboard/jd45/backlight.c | 61 |
1 files changed, 0 insertions, 61 deletions
diff --git a/keyboard/jd45/backlight.c b/keyboard/jd45/backlight.c deleted file mode 100644 index f69364b2a..000000000 --- a/keyboard/jd45/backlight.c +++ /dev/null @@ -1,61 +0,0 @@ - -#include <avr/io.h> -#include "backlight.h" - -#define CHANNEL OCR1C - -void backlight_init_ports() -{ - - // 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; - - backlight_init(); -} - -void backlight_set(uint8_t level) -{ - if ( level == 0 ) - { - // Turn off PWM control on PB7, revert to output low. - TCCR1A &= ~(_BV(COM1C1)); - CHANNEL = 0x0; - // Prevent backlight blink on lowest level - PORTB &= ~(_BV(PORTB7)); - } - else if ( level == BACKLIGHT_LEVELS ) - { - // Prevent backlight blink on lowest level - PORTB &= ~(_BV(PORTB7)); - // Turn on PWM control of PB7 - TCCR1A |= _BV(COM1C1); - // Set the brightness - CHANNEL = 0xFFFF; - } - else - { - // Prevent backlight blink on lowest level - PORTB &= ~(_BV(PORTB7)); - // Turn on PWM control of PB7 - TCCR1A |= _BV(COM1C1); - // Set the brightness - CHANNEL = 0xFFFF >> ((BACKLIGHT_LEVELS - level) * ((BACKLIGHT_LEVELS + 1) / 2)); - } -}
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