diff options
| -rw-r--r-- | quantum/quantum.c | 94 |
1 files changed, 62 insertions, 32 deletions
diff --git a/quantum/quantum.c b/quantum/quantum.c index d3905decf..45ea8cb73 100644 --- a/quantum/quantum.c +++ b/quantum/quantum.c @@ -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(); |