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author | Jack Humbert <jack.humb@gmail.com> | 2016-06-21 22:09:41 -0400 |
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committer | GitHub <noreply@github.com> | 2016-06-21 22:09:41 -0400 |
commit | 464c8e274f993d3571fe5ea5e836fe55a3912ffe (patch) | |
tree | 9d5c08ccf6de468a397f20a5438e72276977fe62 /keyboard/satan/satan.c | |
parent | e329729d3a11b5798f4e2b9f65ac9bc2dcc84a9e (diff) | |
download | firmware-464c8e274f993d3571fe5ea5e836fe55a3912ffe.tar.gz firmware-464c8e274f993d3571fe5ea5e836fe55a3912ffe.tar.bz2 firmware-464c8e274f993d3571fe5ea5e836fe55a3912ffe.zip |
adds backlight levels to the satan keyboard (#431)
* enable 4 levels
* remove breathing stuff
* update channels, comments, hex
Diffstat (limited to 'keyboard/satan/satan.c')
-rw-r--r-- | keyboard/satan/satan.c | 62 |
1 files changed, 60 insertions, 2 deletions
diff --git a/keyboard/satan/satan.c b/keyboard/satan/satan.c index 40bd9dcde..092eb4665 100644 --- a/keyboard/satan/satan.c +++ b/keyboard/satan/satan.c @@ -14,6 +14,64 @@ void matrix_scan_user(void) { // leave these blank }; + +#ifdef BACKLIGHT_ENABLE + +void backlight_init_ports() +{ + + // Setup PB6 as output and output low. + DDRB |= (1<<6); + PORTB &= ~(1<<6); + + // 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 PB6 = OCR1B (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(COM1B1) | _BV(WGM11); // = 0b00001010; + TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001; + + backlight_init(); +} + +void backlight_set(uint8_t level) +{ + // Prevent backlight blink on lowest level + PORTB &= ~(_BV(PORTB6)); + + if ( level == 0 ) + { + // Turn off PWM control on PB6, revert to output low. + TCCR1A &= ~(_BV(COM1B1)); + OCR1B = 0x0; + } + else if ( level == BACKLIGHT_LEVELS ) + { + // Turn on PWM control of PB6 + TCCR1A |= _BV(COM1B1); + // Set the brightness + OCR1B = 0xFFFF; + } + else + { + // Turn on PWM control of PB6 + TCCR1A |= _BV(COM1B1); + // Set the brightness + OCR1B = 0xFFFF >> ((BACKLIGHT_LEVELS - level) * ((BACKLIGHT_LEVELS + 1) / 2)); + } +} + +#endif + void matrix_init_kb(void) { // put your keyboard start-up code here // runs once when the firmware starts up @@ -23,7 +81,7 @@ void matrix_init_kb(void) { led_init_ports(); #ifdef BACKLIGHT_ENABLE - init_backlight_pin(); + backlight_init_ports(); #endif }; @@ -33,4 +91,4 @@ void matrix_scan_kb(void) { if (matrix_scan_user) { (*matrix_scan_user)(); } -}; +};
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