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Merge pull request #1073 from qmk/backlight_changes

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Open backlight functionality to all ports
This commit is contained in:
Jack Humbert 2017-02-09 20:14:35 -05:00 committed by GitHub
commit 6c462e0c01
1 changed files with 62 additions and 32 deletions
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92
quantum/quantum.c
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@ -594,34 +594,45 @@ static const uint8_t backlight_pin = BACKLIGHT_PIN;
# define COM1x1 COM1A1
# define OCR1x OCR1A
#else
# error "Backlight pin not supported - use B5, B6, or B7"
# define NO_BACKLIGHT_CLOCK
#endif
#ifndef BACKLIGHT_ON_STATE
#define BACKLIGHT_ON_STATE 0
#endif
__attribute__ ((weak))
void backlight_init_ports(void)
{
// Setup backlight pin as output and output low.
// Setup backlight pin as output and output to on state.
// DDRx |= n
_SFR_IO8((backlight_pin >> 4) + 1) |= _BV(backlight_pin & 0xF);
// PORTx &= ~n
_SFR_IO8((backlight_pin >> 4) + 2) &= ~_BV(backlight_pin & 0xF);
#if BACKLIGHT_ON_STATE == 0
// PORTx &= ~n
_SFR_IO8((backlight_pin >> 4) + 2) &= ~_BV(backlight_pin & 0xF);
#else
// PORTx |= n
_SFR_IO8((backlight_pin >> 4) + 2) |= _BV(backlight_pin & 0xF);
#endif
// Use full 16-bit resolution.
ICR1 = 0xFFFF;
#ifndef NO_BACKLIGHT_CLOCK
// 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
// 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
// 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(COM1x1) | _BV(WGM11); // = 0b00001010;
TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001;
TCCR1A = _BV(COM1x1) | _BV(WGM11); // = 0b00001010;
TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001;
#endif
backlight_init();
#ifdef BACKLIGHT_BREATHING
@ -633,24 +644,43 @@ __attribute__ ((weak))
void backlight_set(uint8_t level)
{
// Prevent backlight blink on lowest level
// PORTx &= ~n
_SFR_IO8((backlight_pin >> 4) + 2) &= ~_BV(backlight_pin & 0xF);
#if BACKLIGHT_ON_STATE == 0
// PORTx &= ~n
_SFR_IO8((backlight_pin >> 4) + 2) &= ~_BV(backlight_pin & 0xF);
#else
// PORTx |= n
_SFR_IO8((backlight_pin >> 4) + 2) |= _BV(backlight_pin & 0xF);
#endif
if ( level == 0 ) {
// Turn off PWM control on backlight pin, revert to output low.
TCCR1A &= ~(_BV(COM1x1));
OCR1x = 0x0;
} else if ( level == BACKLIGHT_LEVELS ) {
// Turn on PWM control of backlight pin
TCCR1A |= _BV(COM1x1);
// Set the brightness
OCR1x = 0xFFFF;
} else {
// Turn on PWM control of backlight pin
TCCR1A |= _BV(COM1x1);
// Set the brightness
OCR1x = 0xFFFF >> ((BACKLIGHT_LEVELS - level) * ((BACKLIGHT_LEVELS + 1) / 2));
#ifndef NO_BACKLIGHT_CLOCK
// Turn off PWM control on backlight pin, revert to output low.
TCCR1A &= ~(_BV(COM1x1));
OCR1x = 0x0;
#else
#if BACKLIGHT_ON_STATE == 0
// PORTx |= n
_SFR_IO8((backlight_pin >> 4) + 2) |= _BV(backlight_pin & 0xF);
#else
// PORTx &= ~n
_SFR_IO8((backlight_pin >> 4) + 2) &= ~_BV(backlight_pin & 0xF);
#endif
#endif
}
#ifndef NO_BACKLIGHT_CLOCK
else if ( level == BACKLIGHT_LEVELS ) {
// Turn on PWM control of backlight pin
TCCR1A |= _BV(COM1x1);
// Set the brightness
OCR1x = 0xFFFF;
}
else {
// Turn on PWM control of backlight pin
TCCR1A |= _BV(COM1x1);
// Set the brightness
OCR1x = 0xFFFF >> ((BACKLIGHT_LEVELS - level) * ((BACKLIGHT_LEVELS + 1) / 2));
}
#endif
#ifdef BACKLIGHT_BREATHING
breathing_intensity_default();