#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; }