forked from mirrors/qmk_firmware
Prune out pure software pwm && custom driver && remove wrapping BACKLIGHT_PIN (#8041)
This commit is contained in:
Joel Challis
GitHub
parent
3dc061ac78
commit
88356c85c4
1 changed files with 239 additions and 282 deletions
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@ -2,7 +2,9 @@
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#include "backlight.h"
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#include "debug.h"
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#if defined(BACKLIGHT_ENABLE) && (defined(BACKLIGHT_PIN) || defined(BACKLIGHT_PINS))
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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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// This logic is a bit complex, we support 3 setups:
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//
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@ -12,7 +14,7 @@
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// depends on the Audio setup (Audio wins over Backlight).
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// 3. Full software PWM, driven by the matrix scan, if both timers are used by Audio.
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# if (defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__) || defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__)) && (BACKLIGHT_PIN == B5 || BACKLIGHT_PIN == B6 || BACKLIGHT_PIN == B7)
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#if (defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__) || defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__)) && (BACKLIGHT_PIN == B5 || BACKLIGHT_PIN == B6 || BACKLIGHT_PIN == B7)
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# define HARDWARE_PWM
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# define ICRx ICR1
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# define TCCRxA TCCR1A
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@ -34,7 +36,7 @@
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# define COMxx1 COM1C1
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# define OCRxx OCR1C
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# endif
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# elif (defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__) || defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__)) && (BACKLIGHT_PIN == C4 || BACKLIGHT_PIN == C5 || BACKLIGHT_PIN == C6)
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#elif (defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__) || defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__)) && (BACKLIGHT_PIN == C4 || BACKLIGHT_PIN == C5 || BACKLIGHT_PIN == C6)
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# define HARDWARE_PWM
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# define ICRx ICR3
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# define TCCRxA TCCR3A
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@ -64,7 +66,7 @@
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# define COMxx1 COM3A1
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# define OCRxx OCR3A
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# endif
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# elif (defined(__AVR_ATmega16U2__) || defined(__AVR_ATmega32U2__)) && (BACKLIGHT_PIN == B7 || BACKLIGHT_PIN == C5 || BACKLIGHT_PIN == C6)
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#elif (defined(__AVR_ATmega16U2__) || defined(__AVR_ATmega32U2__)) && (BACKLIGHT_PIN == B7 || BACKLIGHT_PIN == C5 || BACKLIGHT_PIN == C6)
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# define HARDWARE_PWM
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# define ICRx ICR1
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# define TCCRxA TCCR1A
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@ -86,7 +88,7 @@
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# define COMxx1 COM1A1
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# define OCRxx OCR1A
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# endif
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# elif defined(__AVR_ATmega32A__) && (BACKLIGHT_PIN == D4 || BACKLIGHT_PIN == D5)
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#elif defined(__AVR_ATmega32A__) && (BACKLIGHT_PIN == D4 || BACKLIGHT_PIN == D5)
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# define HARDWARE_PWM
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# define ICRx ICR1
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# define TCCRxA TCCR1A
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@ -104,7 +106,7 @@
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# define COMxx1 COM1A1
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# define OCRxx OCR1A
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# endif
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# elif defined(__AVR_ATmega328P__) && (BACKLIGHT_PIN == B1 || BACKLIGHT_PIN == B2)
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#elif defined(__AVR_ATmega328P__) && (BACKLIGHT_PIN == B1 || BACKLIGHT_PIN == B2)
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# define HARDWARE_PWM
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# define ICRx ICR1
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# define TCCRxA TCCR1A
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@ -122,9 +124,7 @@
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# define COMxx1 COM1B1
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# define OCRxx OCR1B
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# endif
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# else
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# if !defined(BACKLIGHT_CUSTOM_DRIVER)
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# if !defined(B5_AUDIO) && !defined(B6_AUDIO) && !defined(B7_AUDIO)
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#elif !defined(B5_AUDIO) && !defined(B6_AUDIO) && !defined(B7_AUDIO)
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// Timer 1 is not in use by Audio feature, Backlight can use it
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# pragma message "Using hardware timer 1 with software PWM"
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# define HARDWARE_PWM
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@ -143,7 +143,7 @@
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# define OCIExA OCIE1A
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# define OCRxx OCR1A
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# elif !defined(C6_AUDIO) && !defined(C5_AUDIO) && !defined(C4_AUDIO)
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#elif !defined(C6_AUDIO) && !defined(C5_AUDIO) && !defined(C4_AUDIO)
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# pragma message "Using hardware timer 3 with software PWM"
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// Timer 3 is not in use by Audio feature, Backlight can use it
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# define HARDWARE_PWM
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@ -158,37 +158,33 @@
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# define OCIExA OCIE3A
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# define OCRxx OCR3A
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# else
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# pragma message "Audio in use - using pure software PWM"
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# define NO_HARDWARE_PWM
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# endif
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# else
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# pragma message "Custom driver defined - using pure software PWM"
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# define NO_HARDWARE_PWM
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# endif
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# endif
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#elif defined(BACKLIGHT_CUSTOM_DRIVER)
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error("Please set 'BACKLIGHT_DRIVER = custom' within rules.mk")
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#else
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error("Please set 'BACKLIGHT_DRIVER = software' within rules.mk")
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#endif
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# ifndef BACKLIGHT_ON_STATE
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#ifndef BACKLIGHT_ON_STATE
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# define BACKLIGHT_ON_STATE 1
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# endif
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#endif
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void backlight_on(pin_t backlight_pin) {
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# if BACKLIGHT_ON_STATE == 1
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#if BACKLIGHT_ON_STATE == 1
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writePinHigh(backlight_pin);
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# else
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#else
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writePinLow(backlight_pin);
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# endif
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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 == 1
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#if BACKLIGHT_ON_STATE == 1
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writePinLow(backlight_pin);
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# else
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#else
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writePinHigh(backlight_pin);
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# endif
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#endif
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}
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# if defined(NO_HARDWARE_PWM) || defined(BACKLIGHT_PWM_TIMER) // pwm through software
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#ifdef BACKLIGHT_PWM_TIMER // pwm through software
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// we support multiple backlight pins
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# ifndef BACKLIGHT_LED_COUNT
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@ -210,7 +206,7 @@ void backlight_off(pin_t backlight_pin) {
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static const pin_t backlight_pins[BACKLIGHT_LED_COUNT] = BACKLIGHT_PIN_INIT;
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# else // full hardware PWM
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#else // full hardware PWM
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static inline void enable_pwm(void) {
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# if BACKLIGHT_ON_STATE == 1
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@ -232,42 +228,9 @@ static inline void disable_pwm(void) {
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static const pin_t backlight_pin = BACKLIGHT_PIN;
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# define FOR_EACH_LED(x) x
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# endif
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#endif
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# ifdef NO_HARDWARE_PWM
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void backlight_init_ports(void) {
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// Setup backlight pin as output and output to on state.
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FOR_EACH_LED(setPinOutput(backlight_pin); backlight_on(backlight_pin);)
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# ifdef BACKLIGHT_BREATHING
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if (is_backlight_breathing()) {
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breathing_enable();
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}
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# endif
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}
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uint8_t backlight_tick = 0;
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# ifndef BACKLIGHT_CUSTOM_DRIVER
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void backlight_task(void) {
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if ((0xFFFF >> ((BACKLIGHT_LEVELS - get_backlight_level()) * ((BACKLIGHT_LEVELS + 1) / 2))) & (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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# endif
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# ifdef BACKLIGHT_BREATHING
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# ifndef BACKLIGHT_CUSTOM_DRIVER
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# error "Backlight breathing only available with hardware PWM. Please disable."
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# endif
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# endif
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# else // hardware pwm through timer
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# ifdef BACKLIGHT_PWM_TIMER
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#ifdef BACKLIGHT_PWM_TIMER
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// The idea of software PWM assisted by hardware timers is the following
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// we use the hardware timer in fast PWM mode like for hardware PWM, but
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@ -306,9 +269,9 @@ ISR(TIMERx_OVF_vect) {
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}
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}
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# endif
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#endif
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# define TIMER_TOP 0xFFFFU
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#define TIMER_TOP 0xFFFFU
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// See http://jared.geek.nz/2013/feb/linear-led-pwm
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static uint16_t cie_lightness(uint16_t v) {
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@ -329,40 +292,38 @@ static uint16_t cie_lightness(uint16_t v) {
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// range for val is [0..TIMER_TOP]. PWM pin is high while the timer count is below val.
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static inline void set_pwm(uint16_t val) { OCRxx = val; }
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# ifndef BACKLIGHT_CUSTOM_DRIVER
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void backlight_set(uint8_t level) {
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if (level > BACKLIGHT_LEVELS) level = BACKLIGHT_LEVELS;
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if (level == 0) {
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# ifdef BACKLIGHT_PWM_TIMER
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#ifdef BACKLIGHT_PWM_TIMER
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if (OCRxx) {
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TIMSKx &= ~(_BV(OCIExA));
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TIMSKx &= ~(_BV(TOIEx));
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}
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# else
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#else
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// Turn off PWM control on backlight pin
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disable_pwm();
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# endif
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#endif
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FOR_EACH_LED(backlight_off(backlight_pin);)
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} else {
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# ifdef BACKLIGHT_PWM_TIMER
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#ifdef BACKLIGHT_PWM_TIMER
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if (!OCRxx) {
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TIMSKx |= _BV(OCIExA);
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TIMSKx |= _BV(TOIEx);
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}
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# else
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#else
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// Turn on PWM control of backlight pin
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enable_pwm();
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# endif
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#endif
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}
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// Set the brightness
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set_pwm(cie_lightness(TIMER_TOP * (uint32_t)level / BACKLIGHT_LEVELS));
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}
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void backlight_task(void) {}
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# endif // BACKLIGHT_CUSTOM_DRIVER
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# ifdef BACKLIGHT_BREATHING
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#ifdef BACKLIGHT_BREATHING
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# define BREATHING_NO_HALT 0
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# define BREATHING_HALT_OFF 1
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@ -473,7 +434,7 @@ ISR(TIMERx_OVF_vect)
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set_pwm(cie_lightness(scale_backlight((uint16_t)pgm_read_byte(&breathing_table[index]) * 0x0101U)));
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}
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# endif // BACKLIGHT_BREATHING
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#endif // BACKLIGHT_BREATHING
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void backlight_init_ports(void) {
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// Setup backlight pin as output and output to on state.
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@ -483,12 +444,12 @@ void backlight_init_ports(void) {
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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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# ifdef BACKLIGHT_PWM_TIMER
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#ifdef BACKLIGHT_PWM_TIMER
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// TimerX setup, Fast PWM mode count to TOP set in ICRx
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TCCRxA = _BV(WGM11); // = 0b00000010;
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// clock select clk/1
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TCCRxB = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001;
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# else // hardware PWM
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#else // hardware PWM
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// Pin PB7 = OCR1C (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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@ -507,18 +468,14 @@ void backlight_init_ports(void) {
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# endif
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TCCRxB = _BV(WGM13) | _BV(WGM12) | _BV(CS10);
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# endif
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#endif
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// Use full 16-bit resolution. Counter counts to ICR1 before reset to 0.
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ICRx = TIMER_TOP;
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backlight_init();
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# ifdef BACKLIGHT_BREATHING
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#ifdef BACKLIGHT_BREATHING
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if (is_backlight_breathing()) {
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breathing_enable();
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}
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# endif
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#endif
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}
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# endif // hardware backlight
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#endif // backlight
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