90 lines
2.5 KiB
C
90 lines
2.5 KiB
C
#include "quantum.h"
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#include "backlight.h"
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#if !defined(BACKLIGHT_PIN) && !defined(BACKLIGHT_PINS)
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# error "Backlight pin/pins not defined. Please configure."
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#endif
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#ifdef BACKLIGHT_BREATHING
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# error "Backlight breathing is not available for software PWM. Please disable."
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#endif
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#ifndef BACKLIGHT_ON_STATE
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# define BACKLIGHT_ON_STATE 0
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#endif
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#ifdef BACKLIGHT_PINS
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# define BACKLIGHT_PIN_INIT BACKLIGHT_PINS
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#else
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# define BACKLIGHT_PIN_INIT \
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{ BACKLIGHT_PIN }
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#endif
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static uint16_t s_duty_pattern = 0;
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static const pin_t backlight_pins[] = BACKLIGHT_PIN_INIT;
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#define BACKLIGHT_LED_COUNT (sizeof(backlight_pins) / sizeof(pin_t))
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#define FOR_EACH_LED(x) \
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for (uint8_t i = 0; i < BACKLIGHT_LED_COUNT; i++) { \
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pin_t backlight_pin = backlight_pins[i]; \
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{ x } \
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}
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void backlight_on(pin_t backlight_pin) {
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#if BACKLIGHT_ON_STATE == 0
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writePinLow(backlight_pin);
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#else
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writePinHigh(backlight_pin);
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#endif
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}
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void backlight_off(pin_t backlight_pin) {
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#if BACKLIGHT_ON_STATE == 0
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writePinHigh(backlight_pin);
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#else
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writePinLow(backlight_pin);
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#endif
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}
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void backlight_init_ports(void) {
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// Setup backlight pin as output and output to off state.
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FOR_EACH_LED(setPinOutput(backlight_pin); backlight_off(backlight_pin);)
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}
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// clang-format off
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/** \brief PWM duty patterns
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*
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* We scale the current backlight level to an index within this array. This allows
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* backlight_task to focus on just switching LEDs on/off, and we can predict the duty pattern
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*/
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static uint16_t backlight_duty_table[] = {
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0b0000000000000000,
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0b1000000000000000,
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0b1000000010000000,
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0b1000001000010000,
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0b1000100010001000,
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0b1001001001001000,
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0b1010101010101010,
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0b1110111011101110,
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0b1111111111111111,
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};
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#define backlight_duty_table_size (sizeof(backlight_duty_table) / sizeof(backlight_duty_table[0]))
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// clang-format on
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static uint8_t scale_backlight(uint8_t v) { return v * (backlight_duty_table_size - 1) / BACKLIGHT_LEVELS; }
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void backlight_set(uint8_t level) { s_duty_pattern = backlight_duty_table[scale_backlight(level)]; }
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void backlight_task(void) {
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static uint8_t backlight_tick = 0;
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if (s_duty_pattern & ((uint16_t)1 << backlight_tick)) {
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FOR_EACH_LED(backlight_on(backlight_pin);)
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} else {
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FOR_EACH_LED(backlight_off(backlight_pin);)
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}
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backlight_tick = (backlight_tick + 1) % 16;
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}
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