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backlight stuff

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This commit is contained in:
Jack Humbert 2015-05-07 15:34:46 -04:00
parent 1e0ae2936b
commit cb3e499cc7
8 changed files with 67 additions and 17 deletions
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17
keyboard/planck/backlight.c
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@ -2,9 +2,11 @@
#include <avr/io.h>
#include "backlight.h"
#define CHANNEL OCR1C
void backlight_init_ports()
void backlight_init_ports(uint8_t level)
{
// Setup PB7 as output and output low.
DDRB |= (1<<7);
PORTB &= ~(1<<7);
@ -24,9 +26,8 @@ void backlight_init_ports()
TCCR1A = _BV(COM1C1) | _BV(WGM11); // = 0b00001010;
TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001;
// Default to zero duty cycle.
OCR1C = 0x0000;
backlight_init();
}
void backlight_set(uint8_t level)
@ -35,12 +36,14 @@ void backlight_set(uint8_t level)
{
// Turn off PWM control on PB7, revert to output low.
TCCR1A &= ~(_BV(COM1C1));
// CHANNEL = level << OFFSET | 0x0FFF;
CHANNEL = ((1 << level) - 1);
}
else
{
// Turn on PWM control of PB7
TCCR1A |= _BV(COM1C1);
OCR1C = level << 12 | 0x0FFF;
// CHANNEL = level << OFFSET | 0x0FFF;
CHANNEL = ((1 << level) - 1);
}
}
}