@@ 2,7 2,9 @@
#include "backlight.h"
#include "debug.h"
-#if defined(BACKLIGHT_ENABLE) && (defined(BACKLIGHT_PIN) || defined(BACKLIGHT_PINS))
+#if !defined(BACKLIGHT_PIN) && !defined(BACKLIGHT_PINS)
+# error "Backlight pin/pins not defined. Please configure."
+#endif
// This logic is a bit complex, we support 3 setups:
//
@@ 12,262 14,223 @@
// depends on the Audio setup (Audio wins over Backlight).
// 3. Full software PWM, driven by the matrix scan, if both timers are used by Audio.
-# 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)
-# define HARDWARE_PWM
-# define ICRx ICR1
-# define TCCRxA TCCR1A
-# define TCCRxB TCCR1B
-# define TIMERx_OVF_vect TIMER1_OVF_vect
-# define TIMSKx TIMSK1
-# define TOIEx TOIE1
-
-# if BACKLIGHT_PIN == B5
-# define COMxx0 COM1A0
-# define COMxx1 COM1A1
-# define OCRxx OCR1A
-# elif BACKLIGHT_PIN == B6
-# define COMxx0 COM1B0
-# define COMxx1 COM1B1
-# define OCRxx OCR1B
-# elif BACKLIGHT_PIN == B7
-# define COMxx0 COM1C0
-# define COMxx1 COM1C1
-# define OCRxx OCR1C
-# endif
-# 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)
-# define HARDWARE_PWM
-# define ICRx ICR3
-# define TCCRxA TCCR3A
-# define TCCRxB TCCR3B
-# define TIMERx_OVF_vect TIMER3_OVF_vect
-# define TIMSKx TIMSK3
-# define TOIEx TOIE3
-
-# if BACKLIGHT_PIN == C4
-# if (defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__))
-# error This MCU has no C4 pin!
-# else
-# define COMxx0 COM3C0
-# define COMxx1 COM3C1
-# define OCRxx OCR3C
-# endif
-# elif BACKLIGHT_PIN == C5
-# if (defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__))
-# error This MCU has no C5 pin!
-# else
-# define COMxx0 COM3B0
-# define COMxx1 COM3B1
-# define OCRxx OCR3B
-# endif
-# elif BACKLIGHT_PIN == C6
-# define COMxx0 COM3A0
-# define COMxx1 COM3A1
-# define OCRxx OCR3A
+#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)
+# define HARDWARE_PWM
+# define ICRx ICR1
+# define TCCRxA TCCR1A
+# define TCCRxB TCCR1B
+# define TIMERx_OVF_vect TIMER1_OVF_vect
+# define TIMSKx TIMSK1
+# define TOIEx TOIE1
+
+# if BACKLIGHT_PIN == B5
+# define COMxx0 COM1A0
+# define COMxx1 COM1A1
+# define OCRxx OCR1A
+# elif BACKLIGHT_PIN == B6
+# define COMxx0 COM1B0
+# define COMxx1 COM1B1
+# define OCRxx OCR1B
+# elif BACKLIGHT_PIN == B7
+# define COMxx0 COM1C0
+# define COMxx1 COM1C1
+# define OCRxx OCR1C
+# endif
+#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)
+# define HARDWARE_PWM
+# define ICRx ICR3
+# define TCCRxA TCCR3A
+# define TCCRxB TCCR3B
+# define TIMERx_OVF_vect TIMER3_OVF_vect
+# define TIMSKx TIMSK3
+# define TOIEx TOIE3
+
+# if BACKLIGHT_PIN == C4
+# if (defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__))
+# error This MCU has no C4 pin!
+# else
+# define COMxx0 COM3C0
+# define COMxx1 COM3C1
+# define OCRxx OCR3C
# endif
-# elif (defined(__AVR_ATmega16U2__) || defined(__AVR_ATmega32U2__)) && (BACKLIGHT_PIN == B7 || BACKLIGHT_PIN == C5 || BACKLIGHT_PIN == C6)
-# define HARDWARE_PWM
-# define ICRx ICR1
-# define TCCRxA TCCR1A
-# define TCCRxB TCCR1B
-# define TIMERx_OVF_vect TIMER1_OVF_vect
-# define TIMSKx TIMSK1
-# define TOIEx TOIE1
-
-# if BACKLIGHT_PIN == B7
-# define COMxx0 COM1C0
-# define COMxx1 COM1C1
-# define OCRxx OCR1C
-# elif BACKLIGHT_PIN == C5
-# define COMxx0 COM1B0
-# define COMxx1 COM1B1
-# define OCRxx OCR1B
-# elif BACKLIGHT_PIN == C6
-# define COMxx0 COM1A0
-# define COMxx1 COM1A1
-# define OCRxx OCR1A
+# elif BACKLIGHT_PIN == C5
+# if (defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__))
+# error This MCU has no C5 pin!
+# else
+# define COMxx0 COM3B0
+# define COMxx1 COM3B1
+# define OCRxx OCR3B
# endif
-# elif defined(__AVR_ATmega32A__) && (BACKLIGHT_PIN == D4 || BACKLIGHT_PIN == D5)
-# define HARDWARE_PWM
-# define ICRx ICR1
-# define TCCRxA TCCR1A
-# define TCCRxB TCCR1B
-# define TIMERx_OVF_vect TIMER1_OVF_vect
+# elif BACKLIGHT_PIN == C6
+# define COMxx0 COM3A0
+# define COMxx1 COM3A1
+# define OCRxx OCR3A
+# endif
+#elif (defined(__AVR_ATmega16U2__) || defined(__AVR_ATmega32U2__)) && (BACKLIGHT_PIN == B7 || BACKLIGHT_PIN == C5 || BACKLIGHT_PIN == C6)
+# define HARDWARE_PWM
+# define ICRx ICR1
+# define TCCRxA TCCR1A
+# define TCCRxB TCCR1B
+# define TIMERx_OVF_vect TIMER1_OVF_vect
+# define TIMSKx TIMSK1
+# define TOIEx TOIE1
+
+# if BACKLIGHT_PIN == B7
+# define COMxx0 COM1C0
+# define COMxx1 COM1C1
+# define OCRxx OCR1C
+# elif BACKLIGHT_PIN == C5
+# define COMxx0 COM1B0
+# define COMxx1 COM1B1
+# define OCRxx OCR1B
+# elif BACKLIGHT_PIN == C6
+# define COMxx0 COM1A0
+# define COMxx1 COM1A1
+# define OCRxx OCR1A
+# endif
+#elif defined(__AVR_ATmega32A__) && (BACKLIGHT_PIN == D4 || BACKLIGHT_PIN == D5)
+# define HARDWARE_PWM
+# define ICRx ICR1
+# define TCCRxA TCCR1A
+# define TCCRxB TCCR1B
+# define TIMERx_OVF_vect TIMER1_OVF_vect
+# define TIMSKx TIMSK
+# define TOIEx TOIE1
+
+# if BACKLIGHT_PIN == D4
+# define COMxx0 COM1B0
+# define COMxx1 COM1B1
+# define OCRxx OCR1B
+# elif BACKLIGHT_PIN == D5
+# define COMxx0 COM1A0
+# define COMxx1 COM1A1
+# define OCRxx OCR1A
+# endif
+#elif defined(__AVR_ATmega328P__) && (BACKLIGHT_PIN == B1 || BACKLIGHT_PIN == B2)
+# define HARDWARE_PWM
+# define ICRx ICR1
+# define TCCRxA TCCR1A
+# define TCCRxB TCCR1B
+# define TIMERx_OVF_vect TIMER1_OVF_vect
+# define TIMSKx TIMSK1
+# define TOIEx TOIE1
+
+# if BACKLIGHT_PIN == B1
+# define COMxx0 COM1A0
+# define COMxx1 COM1A1
+# define OCRxx OCR1A
+# elif BACKLIGHT_PIN == B2
+# define COMxx0 COM1B0
+# define COMxx1 COM1B1
+# define OCRxx OCR1B
+# endif
+#elif !defined(B5_AUDIO) && !defined(B6_AUDIO) && !defined(B7_AUDIO)
+// Timer 1 is not in use by Audio feature, Backlight can use it
+# pragma message "Using hardware timer 1 with software PWM"
+# define HARDWARE_PWM
+# define BACKLIGHT_PWM_TIMER
+# define ICRx ICR1
+# define TCCRxA TCCR1A
+# define TCCRxB TCCR1B
+# define TIMERx_COMPA_vect TIMER1_COMPA_vect
+# define TIMERx_OVF_vect TIMER1_OVF_vect
+# if defined(__AVR_ATmega32A__) // This MCU has only one TIMSK register
# define TIMSKx TIMSK
-# define TOIEx TOIE1
-
-# if BACKLIGHT_PIN == D4
-# define COMxx0 COM1B0
-# define COMxx1 COM1B1
-# define OCRxx OCR1B
-# elif BACKLIGHT_PIN == D5
-# define COMxx0 COM1A0
-# define COMxx1 COM1A1
-# define OCRxx OCR1A
-# endif
-# elif defined(__AVR_ATmega328P__) && (BACKLIGHT_PIN == B1 || BACKLIGHT_PIN == B2)
-# define HARDWARE_PWM
-# define ICRx ICR1
-# define TCCRxA TCCR1A
-# define TCCRxB TCCR1B
-# define TIMERx_OVF_vect TIMER1_OVF_vect
-# define TIMSKx TIMSK1
-# define TOIEx TOIE1
-
-# if BACKLIGHT_PIN == B1
-# define COMxx0 COM1A0
-# define COMxx1 COM1A1
-# define OCRxx OCR1A
-# elif BACKLIGHT_PIN == B2
-# define COMxx0 COM1B0
-# define COMxx1 COM1B1
-# define OCRxx OCR1B
-# endif
# else
-# if !defined(BACKLIGHT_CUSTOM_DRIVER)
-# if !defined(B5_AUDIO) && !defined(B6_AUDIO) && !defined(B7_AUDIO)
-// Timer 1 is not in use by Audio feature, Backlight can use it
-# pragma message "Using hardware timer 1 with software PWM"
-# define HARDWARE_PWM
-# define BACKLIGHT_PWM_TIMER
-# define ICRx ICR1
-# define TCCRxA TCCR1A
-# define TCCRxB TCCR1B
-# define TIMERx_COMPA_vect TIMER1_COMPA_vect
-# define TIMERx_OVF_vect TIMER1_OVF_vect
-# if defined(__AVR_ATmega32A__) // This MCU has only one TIMSK register
-# define TIMSKx TIMSK
-# else
-# define TIMSKx TIMSK1
-# endif
-# define TOIEx TOIE1
-
-# define OCIExA OCIE1A
-# define OCRxx OCR1A
-# elif !defined(C6_AUDIO) && !defined(C5_AUDIO) && !defined(C4_AUDIO)
-# pragma message "Using hardware timer 3 with software PWM"
-// Timer 3 is not in use by Audio feature, Backlight can use it
-# define HARDWARE_PWM
-# define BACKLIGHT_PWM_TIMER
-# define ICRx ICR1
-# define TCCRxA TCCR3A
-# define TCCRxB TCCR3B
-# define TIMERx_COMPA_vect TIMER3_COMPA_vect
-# define TIMERx_OVF_vect TIMER3_OVF_vect
-# define TIMSKx TIMSK3
-# define TOIEx TOIE3
-
-# define OCIExA OCIE3A
-# define OCRxx OCR3A
-# else
-# pragma message "Audio in use - using pure software PWM"
-# define NO_HARDWARE_PWM
-# endif
-# else
-# pragma message "Custom driver defined - using pure software PWM"
-# define NO_HARDWARE_PWM
-# endif
+# define TIMSKx TIMSK1
# endif
+# define TOIEx TOIE1
-# ifndef BACKLIGHT_ON_STATE
-# define BACKLIGHT_ON_STATE 1
-# endif
+# define OCIExA OCIE1A
+# define OCRxx OCR1A
+#elif !defined(C6_AUDIO) && !defined(C5_AUDIO) && !defined(C4_AUDIO)
+# pragma message "Using hardware timer 3 with software PWM"
+// Timer 3 is not in use by Audio feature, Backlight can use it
+# define HARDWARE_PWM
+# define BACKLIGHT_PWM_TIMER
+# define ICRx ICR1
+# define TCCRxA TCCR3A
+# define TCCRxB TCCR3B
+# define TIMERx_COMPA_vect TIMER3_COMPA_vect
+# define TIMERx_OVF_vect TIMER3_OVF_vect
+# define TIMSKx TIMSK3
+# define TOIEx TOIE3
+
+# define OCIExA OCIE3A
+# define OCRxx OCR3A
+#elif defined(BACKLIGHT_CUSTOM_DRIVER)
+error("Please set 'BACKLIGHT_DRIVER = custom' within rules.mk")
+#else
+error("Please set 'BACKLIGHT_DRIVER = software' within rules.mk")
+#endif
+
+#ifndef BACKLIGHT_ON_STATE
+# define BACKLIGHT_ON_STATE 1
+#endif
void backlight_on(pin_t backlight_pin) {
-# if BACKLIGHT_ON_STATE == 1
+#if BACKLIGHT_ON_STATE == 1
writePinHigh(backlight_pin);
-# else
+#else
writePinLow(backlight_pin);
-# endif
+#endif
}
void backlight_off(pin_t backlight_pin) {
-# if BACKLIGHT_ON_STATE == 1
+#if BACKLIGHT_ON_STATE == 1
writePinLow(backlight_pin);
-# else
+#else
writePinHigh(backlight_pin);
-# endif
+#endif
}
-# if defined(NO_HARDWARE_PWM) || defined(BACKLIGHT_PWM_TIMER) // pwm through software
+#ifdef BACKLIGHT_PWM_TIMER // pwm through software
// we support multiple backlight pins
-# ifndef BACKLIGHT_LED_COUNT
-# define BACKLIGHT_LED_COUNT 1
-# endif
+# ifndef BACKLIGHT_LED_COUNT
+# define BACKLIGHT_LED_COUNT 1
+# endif
-# if BACKLIGHT_LED_COUNT == 1
-# define BACKLIGHT_PIN_INIT \
- { BACKLIGHT_PIN }
-# else
-# define BACKLIGHT_PIN_INIT BACKLIGHT_PINS
-# endif
+# if BACKLIGHT_LED_COUNT == 1
+# define BACKLIGHT_PIN_INIT \
+ { BACKLIGHT_PIN }
+# else
+# define BACKLIGHT_PIN_INIT BACKLIGHT_PINS
+# endif
-# define FOR_EACH_LED(x) \
- for (uint8_t i = 0; i < BACKLIGHT_LED_COUNT; i++) { \
- pin_t backlight_pin = backlight_pins[i]; \
- { x } \
- }
+# define FOR_EACH_LED(x) \
+ for (uint8_t i = 0; i < BACKLIGHT_LED_COUNT; i++) { \
+ pin_t backlight_pin = backlight_pins[i]; \
+ { x } \
+ }
static const pin_t backlight_pins[BACKLIGHT_LED_COUNT] = BACKLIGHT_PIN_INIT;
-# else // full hardware PWM
+#else // full hardware PWM
static inline void enable_pwm(void) {
-# if BACKLIGHT_ON_STATE == 1
+# if BACKLIGHT_ON_STATE == 1
TCCRxA |= _BV(COMxx1);
-# else
+# else
TCCRxA |= _BV(COMxx1) | _BV(COMxx0);
-# endif
+# endif
}
static inline void disable_pwm(void) {
-# if BACKLIGHT_ON_STATE == 1
+# if BACKLIGHT_ON_STATE == 1
TCCRxA &= ~(_BV(COMxx1));
-# else
+# else
TCCRxA &= ~(_BV(COMxx1) | _BV(COMxx0));
-# endif
+# endif
}
// we support only one backlight pin
static const pin_t backlight_pin = BACKLIGHT_PIN;
-# define FOR_EACH_LED(x) x
-
-# endif
-
-# ifdef NO_HARDWARE_PWM
-void backlight_init_ports(void) {
- // Setup backlight pin as output and output to on state.
- FOR_EACH_LED(setPinOutput(backlight_pin); backlight_on(backlight_pin);)
-
-# ifdef BACKLIGHT_BREATHING
- if (is_backlight_breathing()) {
- breathing_enable();
- }
-# endif
-}
-
-uint8_t backlight_tick = 0;
-
-# ifndef BACKLIGHT_CUSTOM_DRIVER
-void backlight_task(void) {
- if ((0xFFFF >> ((BACKLIGHT_LEVELS - get_backlight_level()) * ((BACKLIGHT_LEVELS + 1) / 2))) & (1 << backlight_tick)) {
- FOR_EACH_LED(backlight_on(backlight_pin);)
- } else {
- FOR_EACH_LED(backlight_off(backlight_pin);)
- }
- backlight_tick = (backlight_tick + 1) % 16;
-}
-# endif
-
-# ifdef BACKLIGHT_BREATHING
-# ifndef BACKLIGHT_CUSTOM_DRIVER
-# error "Backlight breathing only available with hardware PWM. Please disable."
-# endif
-# endif
+# define FOR_EACH_LED(x) x
-# else // hardware pwm through timer
+#endif
-# ifdef BACKLIGHT_PWM_TIMER
+#ifdef BACKLIGHT_PWM_TIMER
// The idea of software PWM assisted by hardware timers is the following
// we use the hardware timer in fast PWM mode like for hardware PWM, but
@@ 288,11 251,11 @@ ISR(TIMERx_COMPA_vect) { FOR_EACH_LED(backlight_off(backlight_pin);) }
// Triggered when the counter reaches the TOP value
// this one triggers at F_CPU/65536 =~ 244 Hz
ISR(TIMERx_OVF_vect) {
-# ifdef BACKLIGHT_BREATHING
+# ifdef BACKLIGHT_BREATHING
if (is_breathing()) {
breathing_task();
}
-# endif
+# endif
// for very small values of OCRxx (or backlight level)
// we can't guarantee this whole code won't execute
// at the same time as the compare match interrupt
@@ 306,9 269,9 @@ ISR(TIMERx_OVF_vect) {
}
}
-# endif
+#endif
-# define TIMER_TOP 0xFFFFU
+#define TIMER_TOP 0xFFFFU
// See http://jared.geek.nz/2013/feb/linear-led-pwm
static uint16_t cie_lightness(uint16_t v) {
@@ 329,88 292,86 @@ static uint16_t cie_lightness(uint16_t v) {
// range for val is [0..TIMER_TOP]. PWM pin is high while the timer count is below val.
static inline void set_pwm(uint16_t val) { OCRxx = val; }
-# ifndef BACKLIGHT_CUSTOM_DRIVER
void backlight_set(uint8_t level) {
if (level > BACKLIGHT_LEVELS) level = BACKLIGHT_LEVELS;
if (level == 0) {
-# ifdef BACKLIGHT_PWM_TIMER
+#ifdef BACKLIGHT_PWM_TIMER
if (OCRxx) {
TIMSKx &= ~(_BV(OCIExA));
TIMSKx &= ~(_BV(TOIEx));
}
-# else
+#else
// Turn off PWM control on backlight pin
disable_pwm();
-# endif
+#endif
FOR_EACH_LED(backlight_off(backlight_pin);)
} else {
-# ifdef BACKLIGHT_PWM_TIMER
+#ifdef BACKLIGHT_PWM_TIMER
if (!OCRxx) {
TIMSKx |= _BV(OCIExA);
TIMSKx |= _BV(TOIEx);
}
-# else
+#else
// Turn on PWM control of backlight pin
enable_pwm();
-# endif
+#endif
}
// Set the brightness
set_pwm(cie_lightness(TIMER_TOP * (uint32_t)level / BACKLIGHT_LEVELS));
}
void backlight_task(void) {}
-# endif // BACKLIGHT_CUSTOM_DRIVER
-# ifdef BACKLIGHT_BREATHING
+#ifdef BACKLIGHT_BREATHING
-# define BREATHING_NO_HALT 0
-# define BREATHING_HALT_OFF 1
-# define BREATHING_HALT_ON 2
-# define BREATHING_STEPS 128
+# define BREATHING_NO_HALT 0
+# define BREATHING_HALT_OFF 1
+# define BREATHING_HALT_ON 2
+# define BREATHING_STEPS 128
-static uint8_t breathing_halt = BREATHING_NO_HALT;
+static uint8_t breathing_halt = BREATHING_NO_HALT;
static uint16_t breathing_counter = 0;
-# ifdef BACKLIGHT_PWM_TIMER
+# ifdef BACKLIGHT_PWM_TIMER
static bool breathing = false;
bool is_breathing(void) { return breathing; }
-# define breathing_interrupt_enable() \
- do { \
- breathing = true; \
- } while (0)
-# define breathing_interrupt_disable() \
- do { \
- breathing = false; \
- } while (0)
-# else
+# define breathing_interrupt_enable() \
+ do { \
+ breathing = true; \
+ } while (0)
+# define breathing_interrupt_disable() \
+ do { \
+ breathing = false; \
+ } while (0)
+# else
bool is_breathing(void) { return !!(TIMSKx & _BV(TOIEx)); }
-# define breathing_interrupt_enable() \
- do { \
- TIMSKx |= _BV(TOIEx); \
- } while (0)
-# define breathing_interrupt_disable() \
- do { \
- TIMSKx &= ~_BV(TOIEx); \
- } while (0)
-# endif
-
-# define breathing_min() \
- do { \
- breathing_counter = 0; \
- } while (0)
-# define breathing_max() \
- do { \
- breathing_counter = get_breathing_period() * 244 / 2; \
- } while (0)
+# define breathing_interrupt_enable() \
+ do { \
+ TIMSKx |= _BV(TOIEx); \
+ } while (0)
+# define breathing_interrupt_disable() \
+ do { \
+ TIMSKx &= ~_BV(TOIEx); \
+ } while (0)
+# endif
+
+# define breathing_min() \
+ do { \
+ breathing_counter = 0; \
+ } while (0)
+# define breathing_max() \
+ do { \
+ breathing_counter = get_breathing_period() * 244 / 2; \
+ } while (0)
void breathing_enable(void) {
breathing_counter = 0;
- breathing_halt = BREATHING_NO_HALT;
+ breathing_halt = BREATHING_NO_HALT;
breathing_interrupt_enable();
}
@@ 451,20 412,20 @@ static const uint8_t breathing_table[BREATHING_STEPS] PROGMEM = {0, 0, 0, 0, 0,
// Use this before the cie_lightness function.
static inline uint16_t scale_backlight(uint16_t v) { return v / BACKLIGHT_LEVELS * get_backlight_level(); }
-# ifdef BACKLIGHT_PWM_TIMER
+# ifdef BACKLIGHT_PWM_TIMER
void breathing_task(void)
-# else
+# else
/* Assuming a 16MHz CPU clock and a timer that resets at 64k (ICR1), the following interrupt handler will run
* about 244 times per second.
*/
ISR(TIMERx_OVF_vect)
-# endif
+# endif
{
- uint8_t breathing_period = get_breathing_period();
- uint16_t interval = (uint16_t)breathing_period * 244 / BREATHING_STEPS;
+ uint8_t breathing_period = get_breathing_period();
+ uint16_t interval = (uint16_t)breathing_period * 244 / BREATHING_STEPS;
// resetting after one period to prevent ugly reset at overflow.
breathing_counter = (breathing_counter + 1) % (breathing_period * 244);
- uint8_t index = breathing_counter / interval % BREATHING_STEPS;
+ uint8_t index = breathing_counter / interval % BREATHING_STEPS;
if (((breathing_halt == BREATHING_HALT_ON) && (index == BREATHING_STEPS / 2)) || ((breathing_halt == BREATHING_HALT_OFF) && (index == BREATHING_STEPS - 1))) {
breathing_interrupt_disable();
@@ 473,7 434,7 @@ ISR(TIMERx_OVF_vect)
set_pwm(cie_lightness(scale_backlight((uint16_t)pgm_read_byte(&breathing_table[index]) * 0x0101U)));
}
-# endif // BACKLIGHT_BREATHING
+#endif // BACKLIGHT_BREATHING
void backlight_init_ports(void) {
// Setup backlight pin as output and output to on state.
@@ 483,12 444,12 @@ void backlight_init_ports(void) {
// Go read the ATmega32u4 datasheet.
// And this: http://blog.saikoled.com/post/43165849837/secret-konami-cheat-code-to-high-resolution-pwm-on
-# ifdef BACKLIGHT_PWM_TIMER
+#ifdef BACKLIGHT_PWM_TIMER
// TimerX setup, Fast PWM mode count to TOP set in ICRx
TCCRxA = _BV(WGM11); // = 0b00000010;
// clock select clk/1
TCCRxB = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001;
-# else // hardware PWM
+#else // hardware PWM
// Pin PB7 = OCR1C (Timer 1, Channel C)
// Compare Output Mode = Clear on compare match, Channel C = COM1C1=1 COM1C0=0
// (i.e. start high, go low when counter matches.)
@@ 500,25 461,21 @@ void backlight_init_ports(void) {
"In fast PWM mode, the compare units allow generation of PWM waveforms on the OCnx pins. Setting the COMnx1:0 bits to two will produce a non-inverted PWM [..]."
"In fast PWM mode the counter is incremented until the counter value matches either one of the fixed values 0x00FF, 0x01FF, or 0x03FF (WGMn3:0 = 5, 6, or 7), the value in ICRn (WGMn3:0 = 14), or the value in OCRnA (WGMn3:0 = 15)."
*/
-# if BACKLIGHT_ON_STATE == 1
+# if BACKLIGHT_ON_STATE == 1
TCCRxA = _BV(COMxx1) | _BV(WGM11);
-# else
+# else
TCCRxA = _BV(COMxx1) | _BV(COMxx0) | _BV(WGM11);
-# endif
+# endif
TCCRxB = _BV(WGM13) | _BV(WGM12) | _BV(CS10);
-# endif
+#endif
// Use full 16-bit resolution. Counter counts to ICR1 before reset to 0.
ICRx = TIMER_TOP;
backlight_init();
-# ifdef BACKLIGHT_BREATHING
+#ifdef BACKLIGHT_BREATHING
if (is_backlight_breathing()) {
breathing_enable();
}
-# endif
+#endif
}
-
-# endif // hardware backlight
-
-#endif // backlight