4 void matrix_init_user(void) {
9 void matrix_scan_user(void) {
13 __attribute__ ((weak))
14 bool process_action_user(keyrecord_t *record) {
18 void matrix_init_kb(void) {
19 #ifdef BACKLIGHT_ENABLE
20 backlight_init_ports();
30 void matrix_scan_kb(void) {
34 bool process_action_kb(keyrecord_t *record) {
35 return process_action_user(record);
38 #ifdef BACKLIGHT_ENABLE
41 void backlight_init_ports()
44 // Setup PB7 as output and output low.
48 // Use full 16-bit resolution.
51 // I could write a wall of text here to explain... but TL;DW
52 // Go read the ATmega32u4 datasheet.
53 // And this: http://blog.saikoled.com/post/43165849837/secret-konami-cheat-code-to-high-resolution-pwm-on
55 // Pin PB7 = OCR1C (Timer 1, Channel C)
56 // Compare Output Mode = Clear on compare match, Channel C = COM1C1=1 COM1C0=0
57 // (i.e. start high, go low when counter matches.)
58 // WGM Mode 14 (Fast PWM) = WGM13=1 WGM12=1 WGM11=1 WGM10=0
59 // Clock Select = clk/1 (no prescaling) = CS12=0 CS11=0 CS10=1
61 TCCR1A = _BV(COM1C1) | _BV(WGM11); // = 0b00001010;
62 TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001;
67 void backlight_set(uint8_t level)
71 // Turn off PWM control on PB7, revert to output low.
72 TCCR1A &= ~(_BV(COM1C1));
74 // Prevent backlight blink on lowest level
75 PORTB &= ~(_BV(PORTB7));
77 else if ( level == BACKLIGHT_LEVELS )
79 // Prevent backlight blink on lowest level
80 PORTB &= ~(_BV(PORTB7));
81 // Turn on PWM control of PB7
82 TCCR1A |= _BV(COM1C1);
88 // Prevent backlight blink on lowest level
89 PORTB &= ~(_BV(PORTB7));
90 // Turn on PWM control of PB7
91 TCCR1A |= _BV(COM1C1);
93 CHANNEL = 0xFFFF >> ((BACKLIGHT_LEVELS - level) * ((BACKLIGHT_LEVELS + 1) / 2));