diff options
Diffstat (limited to 'platforms')
| -rw-r--r-- | platforms/avr/drivers/backlight_pwm.c | 463 | ||||
| -rw-r--r-- | platforms/chibios/drivers/backlight_pwm.c | 173 | ||||
| -rw-r--r-- | platforms/chibios/drivers/backlight_timer.c | 178 |
3 files changed, 814 insertions, 0 deletions
diff --git a/platforms/avr/drivers/backlight_pwm.c b/platforms/avr/drivers/backlight_pwm.c new file mode 100644 index 0000000000..d234115641 --- /dev/null +++ b/platforms/avr/drivers/backlight_pwm.c @@ -0,0 +1,463 @@ +#include "backlight.h" +#include "backlight_driver_common.h" +#include "progmem.h" +#include <avr/io.h> +#include <avr/interrupt.h> + +// Maximum duty cycle limit +#ifndef BACKLIGHT_LIMIT_VAL +# define BACKLIGHT_LIMIT_VAL 255 +#endif + +// This logic is a bit complex, we support 3 setups: +// +// 1. Hardware PWM when backlight is wired to a PWM pin. +// Depending on this pin, we use a different output compare unit. +// 2. Software PWM with hardware timers, but the used timer +// 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 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 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 +# endif +#elif (defined(__AVR_AT90USB162__) || defined(__AVR_ATmega16U2__) || defined(__AVR_ATmega32U2__)) && (BACKLIGHT_PIN == B7 || BACKLIGHT_PIN == C5 || BACKLIGHT_PIN == C6) +# 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 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__) || defined(__AVR_ATmega328__)) && (BACKLIGHT_PIN == B1 || BACKLIGHT_PIN == B2) +# 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 (AUDIO_PIN != B5) && (AUDIO_PIN != B6) && (AUDIO_PIN != B7) && (AUDIO_PIN_ALT != B5) && (AUDIO_PIN_ALT != B6) && (AUDIO_PIN_ALT != B7) +// Timer 1 is not in use by Audio feature, Backlight can use it +# pragma message "Using hardware timer 1 with software 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 (AUDIO_PIN != C4) && (AUDIO_PIN != C5) && (AUDIO_PIN != C6) +# pragma message "Using hardware timer 3 with software PWM" +// Timer 3 is not in use by Audio feature, Backlight can use it +# 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 +#endif + +#ifndef BACKLIGHT_PWM_TIMER // pwm through software + +static inline void enable_pwm(void) { +# if BACKLIGHT_ON_STATE == 1 + TCCRxA |= _BV(COMxx1); +# else + TCCRxA |= _BV(COMxx1) | _BV(COMxx0); +# endif +} + +static inline void disable_pwm(void) { +# if BACKLIGHT_ON_STATE == 1 + TCCRxA &= ~(_BV(COMxx1)); +# else + TCCRxA &= ~(_BV(COMxx1) | _BV(COMxx0)); +# endif +} + +#endif + +#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 +// instead of letting the Output Match Comparator control the led pin +// (which is not possible since the backlight is not wired to PWM pins on the +// CPU), we do the LED on/off by oursleves. +// The timer is setup to count up to 0xFFFF, and we set the Output Compare +// register to the current 16bits backlight level (after CIE correction). +// This means the CPU will trigger a compare match interrupt when the counter +// reaches the backlight level, where we turn off the LEDs, +// but also an overflow interrupt when the counter rolls back to 0, +// in which we're going to turn on the LEDs. +// The LED will then be on for OCRxx/0xFFFF time, adjusted every 244Hz, +// or F_CPU/BACKLIGHT_CUSTOM_RESOLUTION if used. + +// Triggered when the counter reaches the OCRx value +ISR(TIMERx_COMPA_vect) { + backlight_pins_off(); +} + +// Triggered when the counter reaches the TOP value +// this one triggers at F_CPU/ICRx = 16MHz/65536 =~ 244 Hz +ISR(TIMERx_OVF_vect) { +# ifdef BACKLIGHT_BREATHING + if (is_breathing()) { + breathing_task(); + } +# 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 + // which means that we might turn on the leds while + // trying to turn them off, leading to flickering + // artifacts (especially while breathing, because breathing_task + // takes many computation cycles). + // so better not turn them on while the counter TOP is very low. + if (OCRxx > ICRx / 250 + 5) { + backlight_pins_on(); + } +} + +#endif + +#define TIMER_TOP 0xFFFFU + +// See http://jared.geek.nz/2013/feb/linear-led-pwm +static uint16_t cie_lightness(uint16_t v) { + if (v <= (uint32_t)ICRx / 12) // If the value is less than or equal to ~8% of max + { + return v / 9; // Same as dividing by 900% + } else { + // In the next two lines values are bit-shifted. This is to avoid loosing decimals in integer math. + uint32_t y = (((uint32_t)v + (uint32_t)ICRx / 6) << 5) / ((uint32_t)ICRx / 6 + ICRx); // If above 8%, add ~16% of max, and normalize with (max + ~16% max) + uint32_t out = (y * y * y * ICRx) >> 15; // Cube it and undo the bit-shifting. (which is now three times as much due to the cubing) + + if (out > ICRx) // Avoid overflows + { + out = ICRx; + } + return (uint16_t)out; + } +} + +// rescale the supplied backlight value to be in terms of the value limit // range for val is [0..ICRx]. PWM pin is high while the timer count is below val. +static uint32_t rescale_limit_val(uint32_t val) { + return (val * (BACKLIGHT_LIMIT_VAL + 1)) / 256; +} + +// range for val is [0..ICRx]. PWM pin is high while the timer count is below val. +static inline void set_pwm(uint16_t val) { + OCRxx = val; +} + +void backlight_set(uint8_t level) { + if (level > BACKLIGHT_LEVELS) level = BACKLIGHT_LEVELS; + + if (level == 0) { +#ifdef BACKLIGHT_PWM_TIMER + if (OCRxx) { + TIMSKx &= ~(_BV(OCIExA)); + TIMSKx &= ~(_BV(TOIEx)); + } +#else + // Turn off PWM control on backlight pin + disable_pwm(); +#endif + backlight_pins_off(); + } else { +#ifdef BACKLIGHT_PWM_TIMER + if (!OCRxx) { + TIMSKx |= _BV(OCIExA); + TIMSKx |= _BV(TOIEx); + } +#else + // Turn on PWM control of backlight pin + enable_pwm(); +#endif + } + // Set the brightness + set_pwm(cie_lightness(rescale_limit_val(ICRx * (uint32_t)level / BACKLIGHT_LEVELS))); +} + +void backlight_task(void) {} + +#ifdef BACKLIGHT_BREATHING + +# 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 uint16_t breathing_counter = 0; + +static uint8_t breath_scale_counter = 1; +/* Run the breathing loop at ~120Hz*/ +const uint8_t breathing_ISR_frequency = 120; +static uint16_t breathing_freq_scale_factor = 2; + +# 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 + +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() * breathing_ISR_frequency / 2; \ + } while (0) + +void breathing_enable(void) { + breathing_counter = 0; + breathing_halt = BREATHING_NO_HALT; + breathing_interrupt_enable(); +} + +void breathing_pulse(void) { + if (get_backlight_level() == 0) + breathing_min(); + else + breathing_max(); + breathing_halt = BREATHING_HALT_ON; + breathing_interrupt_enable(); +} + +void breathing_disable(void) { + breathing_interrupt_disable(); + // Restore backlight level + backlight_set(get_backlight_level()); +} + +void breathing_self_disable(void) { + if (get_backlight_level() == 0) + breathing_halt = BREATHING_HALT_OFF; + else + breathing_halt = BREATHING_HALT_ON; +} + +/* To generate breathing curve in python: + * from math import sin, pi; [int(sin(x/128.0*pi)**4*255) for x in range(128)] + */ +static const uint8_t breathing_table[BREATHING_STEPS] PROGMEM = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 17, 20, 24, 28, 32, 36, 41, 46, 51, 57, 63, 70, 76, 83, 91, 98, 106, 113, 121, 129, 138, 146, 154, 162, 170, 178, 185, 193, 200, 207, 213, 220, 225, 231, 235, 240, 244, 247, 250, 252, 253, 254, 255, 254, 253, 252, 250, 247, 244, 240, 235, 231, 225, 220, 213, 207, 200, 193, 185, 178, 170, 162, 154, 146, 138, 129, 121, 113, 106, 98, 91, 83, 76, 70, 63, 57, 51, 46, 41, 36, 32, 28, 24, 20, 17, 15, 12, 10, 8, 6, 5, 4, 3, 2, 1, 1, 0, 0, 0, 0, 0, 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 +void breathing_task(void) +# 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. + * + * The following ISR runs at F_CPU/ISRx. With a 16MHz clock and default pwm resolution, that means 244Hz + */ +ISR(TIMERx_OVF_vect) +# endif +{ + + // Only run this ISR at ~120 Hz + if (breath_scale_counter++ == breathing_freq_scale_factor) { + breath_scale_counter = 1; + } else { + return; + } + uint16_t interval = (uint16_t)get_breathing_period() * breathing_ISR_frequency / BREATHING_STEPS; + // resetting after one period to prevent ugly reset at overflow. + breathing_counter = (breathing_counter + 1) % (get_breathing_period() * breathing_ISR_frequency); + uint8_t index = breathing_counter / interval; + // limit index to max step value + if (index >= BREATHING_STEPS) { + index = BREATHING_STEPS - 1; + } + + if (((breathing_halt == BREATHING_HALT_ON) && (index == BREATHING_STEPS / 2)) || ((breathing_halt == BREATHING_HALT_OFF) && (index == BREATHING_STEPS - 1))) { + breathing_interrupt_disable(); + } + + // Set PWM to a brightnessvalue scaled to the configured resolution + set_pwm(cie_lightness(rescale_limit_val(scale_backlight((uint32_t)pgm_read_byte(&breathing_table[index]) * ICRx / 255)))); +} + +#endif // BACKLIGHT_BREATHING + +void backlight_init_ports(void) { + // Setup backlight pin as output and output to on state. + backlight_pins_init(); + + // I could write a wall of text here to explain... but TL;DW + // 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 + // 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 + // 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.) + // WGM Mode 14 (Fast PWM) = WGM13=1 WGM12=1 WGM11=1 WGM10=0 + // Clock Select = clk/1 (no prescaling) = CS12=0 CS11=0 CS10=1 + + /* + 14.8.3: + "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)." + */ + TCCRxA = _BV(COMxx1) | _BV(WGM11); // = 0b00001010; + TCCRxB = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001; +#endif + +#ifdef BACKLIGHT_CUSTOM_RESOLUTION +# if (BACKLIGHT_CUSTOM_RESOLUTION > 0xFFFF || BACKLIGHT_CUSTOM_RESOLUTION < 1) +# error "This out of range of the timer capabilities" +# elif (BACKLIGHT_CUSTOM_RESOLUTION < 0xFF) +# warning "Resolution lower than 0xFF isn't recommended" +# endif +# ifdef BACKLIGHT_BREATHING + breathing_freq_scale_factor = F_CPU / BACKLIGHT_CUSTOM_RESOLUTION / 120; +# endif + ICRx = BACKLIGHT_CUSTOM_RESOLUTION; +#else + ICRx = TIMER_TOP; +#endif + + backlight_init(); +#ifdef BACKLIGHT_BREATHING + if (is_backlight_breathing()) { + breathing_enable(); + } +#endif +} diff --git a/platforms/chibios/drivers/backlight_pwm.c b/platforms/chibios/drivers/backlight_pwm.c new file mode 100644 index 0000000000..01e6f71307 --- /dev/null +++ b/platforms/chibios/drivers/backlight_pwm.c @@ -0,0 +1,173 @@ +#include "backlight.h" +#include "gpio.h" +#include "wait.h" +#include <hal.h> + +// Maximum duty cycle limit +#ifndef BACKLIGHT_LIMIT_VAL +# define BACKLIGHT_LIMIT_VAL 255 +#endif + +#ifndef BACKLIGHT_PAL_MODE +# if defined(USE_GPIOV1) +# define BACKLIGHT_PAL_MODE PAL_MODE_ALTERNATE_PUSHPULL +# else +// GPIOV2 && GPIOV3 +# define BACKLIGHT_PAL_MODE 2 +# endif +#endif + +// GENERIC +#ifndef BACKLIGHT_PWM_DRIVER +# define BACKLIGHT_PWM_DRIVER PWMD4 +#endif +#ifndef BACKLIGHT_PWM_CHANNEL +# define BACKLIGHT_PWM_CHANNEL 3 +#endif + +// Support for pins which are on TIM1_CH1N - requires STM32_PWM_USE_ADVANCED +#ifdef BACKLIGHT_PWM_COMPLEMENTARY_OUTPUT +# if BACKLIGHT_ON_STATE == 1 +# define PWM_OUTPUT_MODE PWM_COMPLEMENTARY_OUTPUT_ACTIVE_LOW; +# else +# define PWM_OUTPUT_MODE PWM_COMPLEMENTARY_OUTPUT_ACTIVE_HIGH; +# endif +#else +# if BACKLIGHT_ON_STATE == 1 +# define PWM_OUTPUT_MODE PWM_OUTPUT_ACTIVE_HIGH; +# else +# define PWM_OUTPUT_MODE PWM_OUTPUT_ACTIVE_LOW; +# endif +#endif + +#ifndef BACKLIGHT_PWM_COUNTER_FREQUENCY +# define BACKLIGHT_PWM_COUNTER_FREQUENCY 0xFFFF +#endif + +#ifndef BACKLIGHT_PWM_PERIOD +# define BACKLIGHT_PWM_PERIOD 256 +#endif + +static PWMConfig pwmCFG = { + .frequency = BACKLIGHT_PWM_COUNTER_FREQUENCY, /* PWM clock frequency */ + .period = BACKLIGHT_PWM_PERIOD, /* PWM period in counter ticks. e.g. clock frequency is 10KHz, period is 256 ticks then t_period is 25.6ms */ +}; + +#ifdef BACKLIGHT_BREATHING +static virtual_timer_t breathing_vt; +#endif + +// See http://jared.geek.nz/2013/feb/linear-led-pwm +static uint16_t cie_lightness(uint16_t v) { + if (v <= 5243) // if below 8% of max + return v / 9; // same as dividing by 900% + else { + uint32_t y = (((uint32_t)v + 10486) << 8) / (10486 + 0xFFFFUL); // add 16% of max and compare + // to get a useful result with integer division, we shift left in the expression above + // and revert what we've done again after squaring. + y = y * y * y >> 8; + if (y > 0xFFFFUL) { // prevent overflow + return 0xFFFFU; + } else { + return (uint16_t)y; + } + } +} + +static uint32_t rescale_limit_val(uint32_t val) { + // rescale the supplied backlight value to be in terms of the value limit + return (val * (BACKLIGHT_LIMIT_VAL + 1)) / 256; +} + +void backlight_init_ports(void) { +#ifdef USE_GPIOV1 + palSetPadMode(PAL_PORT(BACKLIGHT_PIN), PAL_PAD(BACKLIGHT_PIN), BACKLIGHT_PAL_MODE); +#else + palSetPadMode(PAL_PORT(BACKLIGHT_PIN), PAL_PAD(BACKLIGHT_PIN), PAL_MODE_ALTERNATE(BACKLIGHT_PAL_MODE)); +#endif + + pwmCFG.channels[BACKLIGHT_PWM_CHANNEL - 1].mode = PWM_OUTPUT_MODE; + pwmStart(&BACKLIGHT_PWM_DRIVER, &pwmCFG); + + backlight_set(get_backlight_level()); + +#ifdef BACKLIGHT_BREATHING + chVTObjectInit(&breathing_vt); + if (is_backlight_breathing()) { + breathing_enable(); + } +#endif +} + +void backlight_set(uint8_t level) { + if (level > BACKLIGHT_LEVELS) { + level = BACKLIGHT_LEVELS; + } + + if (level == 0) { + // Turn backlight off + pwmDisableChannel(&BACKLIGHT_PWM_DRIVER, BACKLIGHT_PWM_CHANNEL - 1); + } else { + // Turn backlight on + uint32_t duty = (uint32_t)(cie_lightness(rescale_limit_val(0xFFFF * (uint32_t)level / BACKLIGHT_LEVELS))); + pwmEnableChannel(&BACKLIGHT_PWM_DRIVER, BACKLIGHT_PWM_CHANNEL - 1, PWM_FRACTION_TO_WIDTH(&BACKLIGHT_PWM_DRIVER, 0xFFFF, duty)); + } +} + +void backlight_task(void) {} + +#ifdef BACKLIGHT_BREATHING + +# define BREATHING_STEPS 128 + +/* To generate breathing curve in python: + * from math import sin, pi; [int(sin(x/128.0*pi)**4*255) for x in range(128)] + */ +static const uint8_t breathing_table[BREATHING_STEPS] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 17, 20, 24, 28, 32, 36, 41, 46, 51, 57, 63, 70, 76, 83, 91, 98, 106, 113, 121, 129, 138, 146, 154, 162, 170, 178, 185, 193, 200, 207, 213, 220, 225, 231, 235, 240, 244, 247, 250, 252, 253, 254, 255, 254, 253, 252, 250, 247, 244, 240, 235, 231, 225, 220, 213, 207, 200, 193, 185, 178, 170, 162, 154, 146, 138, 129, 121, 113, 106, 98, 91, 83, 76, 70, 63, 57, 51, 46, 41, 36, 32, 28, 24, 20, 17, 15, 12, 10, 8, 6, 5, 4, 3, 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}; + +static void breathing_callback(virtual_timer_t *vtp, void *p); + +bool is_breathing(void) { + return chVTIsArmed(&breathing_vt); +} + +void breathing_enable(void) { + /* Update frequency is 256Hz -> 3906us intervals */ + chVTSetContinuous(&breathing_vt, TIME_US2I(3906), breathing_callback, NULL); +} + +void breathing_disable(void) { + chVTReset(&breathing_vt); + + // Restore backlight level + backlight_set(get_backlight_level()); +} + +// Use this before the cie_lightness function. +static inline uint16_t scale_backlight(uint16_t v) { + return v / BACKLIGHT_LEVELS * get_backlight_level(); +} + +static void breathing_callback(virtual_timer_t *vtp, void *p) { + uint8_t breathing_period = get_breathing_period(); + uint16_t interval = (uint16_t)breathing_period * 256 / BREATHING_STEPS; + + // resetting after one period to prevent ugly reset at overflow. + static uint16_t breathing_counter = 0; + breathing_counter = (breathing_counter + 1) % (breathing_period * 256); + uint8_t index = breathing_counter / interval % BREATHING_STEPS; + uint32_t duty = cie_lightness(rescale_limit_val(scale_backlight(breathing_table[index] * 256))); + + chSysLockFromISR(); + pwmEnableChannelI(&BACKLIGHT_PWM_DRIVER, BACKLIGHT_PWM_CHANNEL - 1, PWM_FRACTION_TO_WIDTH(&BACKLIGHT_PWM_DRIVER, 0xFFFF, duty)); + chSysUnlockFromISR(); +} + +// TODO: integrate generic pulse solution +void breathing_pulse(void) { + backlight_set(is_backlight_enabled() ? 0 : BACKLIGHT_LEVELS); + wait_ms(10); + backlight_set(is_backlight_enabled() ? get_backlight_level() : 0); +} + +#endif diff --git a/platforms/chibios/drivers/backlight_timer.c b/platforms/chibios/drivers/backlight_timer.c new file mode 100644 index 0000000000..0fabee93b1 --- /dev/null +++ b/platforms/chibios/drivers/backlight_timer.c @@ -0,0 +1,178 @@ +#include "backlight.h" +#include "backlight_driver_common.h" +#include "wait.h" + +#ifndef BACKLIGHT_GPT_DRIVER +# define BACKLIGHT_GPT_DRIVER GPTD15 +#endif + +// Platform specific implementations +static void backlight_timer_configure(bool enable); +static void backlight_timer_set_duty(uint16_t duty); +static uint16_t backlight_timer_get_duty(void); + +// See http://jared.geek.nz/2013/feb/linear-led-pwm +static uint16_t cie_lightness(uint16_t v) { + if (v <= 5243) // if below 8% of max + return v / 9; // same as dividing by 900% + else { + uint32_t y = (((uint32_t)v + 10486) << 8) / (10486 + 0xFFFFUL); // add 16% of max and compare + // to get a useful result with integer division, we shift left in the expression above + // and revert what we've done again after squaring. + y = y * y * y >> 8; + if (y > 0xFFFFUL) // prevent overflow + return 0xFFFFU; + else + return (uint16_t)y; + } +} + +void backlight_init_ports(void) { + backlight_pins_init(); + + backlight_set(get_backlight_level()); + +#ifdef BACKLIGHT_BREATHING + if (is_backlight_breathing()) { + breathing_enable(); + } +#endif +} + +void backlight_set(uint8_t level) { + if (level > BACKLIGHT_LEVELS) level = BACKLIGHT_LEVELS; + + backlight_pins_off(); + + backlight_timer_set_duty(cie_lightness(0xFFFFU / BACKLIGHT_LEVELS * level)); + backlight_timer_configure(level != 0); +} + +static void backlight_timer_top(void) { +#ifdef BACKLIGHT_BREATHING + if (is_breathing()) { + breathing_task(); + } +#endif + + if (backlight_timer_get_duty() > 256) { + backlight_pins_on(); + } +} + +static void backlight_timer_cmp(void) { + backlight_pins_off(); +} + +void backlight_task(void) {} + +#ifdef BACKLIGHT_BREATHING +# define BREATHING_STEPS 128 + +static bool breathing = false; +static uint16_t breathing_counter = 0; + +/* To generate breathing curve in python: + * from math import sin, pi; [int(sin(x/128.0*pi)**4*255) for x in range(128)] + */ +static const uint8_t breathing_table[BREATHING_STEPS] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 17, 20, 24, 28, 32, 36, 41, 46, 51, 57, 63, 70, 76, 83, 91, 98, 106, 113, 121, 129, 138, 146, 154, 162, 170, 178, 185, 193, 200, 207, 213, 220, 225, 231, 235, 240, 244, 247, 250, 252, 253, 254, 255, 254, 253, 252, 250, 247, 244, 240, 235, 231, 225, 220, 213, 207, 200, 193, 185, 178, 170, 162, 154, 146, 138, 129, 121, 113, 106, 98, 91, 83, 76, 70, 63, 57, 51, 46, 41, 36, 32, 28, 24, 20, 17, 15, 12, 10, 8, 6, 5, 4, 3, 2, 1, 1, 0, 0, 0, 0, 0, 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(); +} + +void breathing_task(void) { + uint8_t breathing_period = get_breathing_period(); + uint16_t interval = (uint16_t)breathing_period * 256 / BREATHING_STEPS; + // resetting after one period to prevent ugly reset at overflow. + breathing_counter = (breathing_counter + 1) % (breathing_period * 256); + uint8_t index = breathing_counter / interval % BREATHING_STEPS; + + // printf("index:%u\n", index); + + backlight_timer_set_duty(cie_lightness(scale_backlight((uint16_t)breathing_table[index] * 256))); +} + +bool is_breathing(void) { + return breathing; +} + +void breathing_enable(void) { + breathing_counter = 0; + breathing = true; +} +void breathing_disable(void) { + breathing = false; +} + +void breathing_pulse(void) { + backlight_set(is_backlight_enabled() ? 0 : BACKLIGHT_LEVELS); + wait_ms(10); + backlight_set(is_backlight_enabled() ? get_backlight_level() : 0); +} +#endif + +#ifdef PROTOCOL_CHIBIOS +// On Platforms where timers fire every tick and have no capture/top events +// - fake event in the normal timer callback +uint16_t s_duty = 0; + +static void timerCallback(void) { + /* Software PWM + * timer:1111 1111 1111 1111 + * \______/| \_______/____ count(0-255) + * \ \______________ unused(1) + * \__________________ index of step table(0-127) + */ + + // this works for cca 65536 irqs/sec + static union { + uint16_t raw; + struct { + uint16_t count : 8; + uint8_t dummy : 1; + uint8_t index : 7; + } pwm; + } timer = {.raw = 0}; + + timer.raw++; + + if (timer.pwm.count == 0) { + // LED on + backlight_timer_top(); + } else if (timer.pwm.count == (s_duty / 256)) { + // LED off + backlight_timer_cmp(); + } +} + +static void backlight_timer_set_duty(uint16_t duty) { + s_duty = duty; +} +static uint16_t backlight_timer_get_duty(void) { + return s_duty; +} + +// ChibiOS - Map GPT timer onto Software PWM +static void gptTimerCallback(GPTDriver *gptp) { + (void)gptp; + timerCallback(); +} + +static void backlight_timer_configure(bool enable) { + static const GPTConfig gptcfg = {1000000, gptTimerCallback, 0, 0}; + + static bool s_init = false; + if (!s_init) { + gptStart(&BACKLIGHT_GPT_DRIVER, &gptcfg); + s_init = true; + } + + if (enable) { + gptStartContinuous(&BACKLIGHT_GPT_DRIVER, gptcfg.frequency / 0xFFFF); + } else { + gptStopTimer(&BACKLIGHT_GPT_DRIVER); + } +} +#endif |