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@ -14,6 +14,64 @@ void matrix_scan_user(void) { |
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// leave these blank |
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}; |
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#ifdef BACKLIGHT_ENABLE |
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void backlight_init_ports() |
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{ |
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// Setup PB6 as output and output low. |
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DDRB |= (1<<6); |
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PORTB &= ~(1<<6); |
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// Use full 16-bit resolution. |
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ICR1 = 0xFFFF; |
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// I could write a wall of text here to explain... but TL;DW |
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// Go read the ATmega32u4 datasheet. |
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// And this: http://blog.saikoled.com/post/43165849837/secret-konami-cheat-code-to-high-resolution-pwm-on |
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// Pin PB6 = OCR1B (Timer 1, Channel C) |
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// Compare Output Mode = Clear on compare match, Channel C = COM1C1=1 COM1C0=0 |
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// (i.e. start high, go low when counter matches.) |
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// WGM Mode 14 (Fast PWM) = WGM13=1 WGM12=1 WGM11=1 WGM10=0 |
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// Clock Select = clk/1 (no prescaling) = CS12=0 CS11=0 CS10=1 |
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TCCR1A = _BV(COM1B1) | _BV(WGM11); // = 0b00001010; |
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TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001; |
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backlight_init(); |
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} |
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void backlight_set(uint8_t level) |
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{ |
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// Prevent backlight blink on lowest level |
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PORTB &= ~(_BV(PORTB6)); |
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if ( level == 0 ) |
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{ |
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// Turn off PWM control on PB6, revert to output low. |
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TCCR1A &= ~(_BV(COM1B1)); |
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OCR1B = 0x0; |
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} |
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else if ( level == BACKLIGHT_LEVELS ) |
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{ |
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// Turn on PWM control of PB6 |
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TCCR1A |= _BV(COM1B1); |
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// Set the brightness |
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OCR1B = 0xFFFF; |
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} |
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else |
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{ |
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// Turn on PWM control of PB6 |
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TCCR1A |= _BV(COM1B1); |
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// Set the brightness |
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OCR1B = 0xFFFF >> ((BACKLIGHT_LEVELS - level) * ((BACKLIGHT_LEVELS + 1) / 2)); |
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} |
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} |
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#endif |
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void matrix_init_kb(void) { |
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// put your keyboard start-up code here |
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// runs once when the firmware starts up |
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@ -23,7 +81,7 @@ void matrix_init_kb(void) { |
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led_init_ports(); |
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#ifdef BACKLIGHT_ENABLE |
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init_backlight_pin(); |
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backlight_init_ports(); |
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#endif |
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}; |
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@ -33,4 +91,4 @@ void matrix_scan_kb(void) { |
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if (matrix_scan_user) { |
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(*matrix_scan_user)(); |
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} |
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}; |
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}; |