- #include "quantum.h"
- #include "backlight.h"
- #include "backlight_driver_common.h"
-
- #ifdef BACKLIGHT_BREATHING
- # error "Backlight breathing is not available for software PWM. Please disable."
- #endif
-
- static uint16_t s_duty_pattern = 0;
-
- // clang-format off
-
- /** \brief PWM duty patterns
- *
- * We scale the current backlight level to an index within this array. This allows
- * backlight_task to focus on just switching LEDs on/off, and we can predict the duty pattern
- */
- static const uint16_t backlight_duty_table[] = {
- 0b0000000000000000,
- 0b1000000000000000,
- 0b1000000010000000,
- 0b1000001000010000,
- 0b1000100010001000,
- 0b1001001001001000,
- 0b1010101010101010,
- 0b1110111011101110,
- 0b1111111111111111,
- };
- #define backlight_duty_table_size (sizeof(backlight_duty_table) / sizeof(backlight_duty_table[0]))
-
- // clang-format on
-
- static uint8_t scale_backlight(uint8_t v) { return v * (backlight_duty_table_size - 1) / BACKLIGHT_LEVELS; }
-
- void backlight_init_ports(void) { backlight_pins_init(); }
-
- void backlight_set(uint8_t level) { s_duty_pattern = backlight_duty_table[scale_backlight(level)]; }
-
- void backlight_task(void) {
- static uint8_t backlight_tick = 0;
-
- if (s_duty_pattern & ((uint16_t)1 << backlight_tick)) {
- backlight_pins_on();
- } else {
- backlight_pins_off();
- }
- backlight_tick = (backlight_tick + 1) % 16;
- }
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