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qmk-firmware/quantum/quantum.h
Brice Figureau b61baf4281 Fix #3566 use an hardware timer for software PWM stability (#3615) 
With my XD60, I noticed that when typing the backlight was flickering.

The XD60 doesn't have the backlight wired to a hardware PWM pin.
I assumed it was a timing issue in the matrix scan that made the PWM
lit the LED a bit too longer. I verified it because the more keys that
were pressed, the more lighting I observed.

This patch makes the software PWM be called during CPU interruptions.
It works almost like the hardware PWM, except instead of using
the CPU waveform generation, the CPU will fire interruption
when the LEDs need be turned on or off.

Using the same timer system as for hardware PWM, when the counter
will reach OCRxx (the current backlight level), an Output Compare
match interrupt will be fired and we'll turn the LEDs off.
When the counter reaches its maximum value, an overflow interrupt
will be triggered in which we turn the LEDs on.
This way we replicate the hardware backlight PWM duty cycle.

This gives a better time stability of the PWM computation than pure
software PWM, leading to a flicker free backlight.

Since this is reusing the hardware PWM code, software PWM also supports
backlight breathing.

Note that if timer1 is used for audio, backlight will use timer3, and if
timer3 is used for audio backlight will use timer1.
If both timers are used for audio, then this feature is disabled and we
revert to the matrix scan based PWM computation.

Signed-off-by: Brice Figureau <brice@daysofwonder.com>
2019-04-22 08:34:13 -07:00

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/* Copyright 2016-2018 Erez Zukerman, Jack Humbert, Yiancar
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef QUANTUM_H
#define QUANTUM_H
#if defined(__AVR__)
#include <avr/pgmspace.h>
#include <avr/io.h>
#include <avr/interrupt.h>
#endif
#if defined(PROTOCOL_CHIBIOS)
#include "hal.h"
#endif
#include "wait.h"
#include "matrix.h"
#include "keymap.h"
#ifdef BACKLIGHT_ENABLE
#ifdef LED_MATRIX_ENABLE
#include "ledmatrix.h"
#else
#include "backlight.h"
#endif
#endif
#ifdef RGBLIGHT_ENABLE
#include "rgblight.h"
#else
#ifdef RGB_MATRIX_ENABLE
/* dummy define RGBLIGHT_MODE_xxxx */
#define RGBLIGHT_H_DUMMY_DEFINE
#include "rgblight.h"
#endif
#endif
#ifdef RGB_MATRIX_ENABLE
#include "rgb_matrix.h"
#endif
#include "action_layer.h"
#include "eeconfig.h"
#include <stddef.h>
#include "bootloader.h"
#include "timer.h"
#include "config_common.h"
#include "led.h"
#include "action_util.h"
#include <stdlib.h>
#include "print.h"
#include "send_string_keycodes.h"
#include "suspend.h"
extern uint32_t default_layer_state;
#ifndef NO_ACTION_LAYER
extern uint32_t layer_state;
#endif
#ifdef MIDI_ENABLE
#ifdef MIDI_ADVANCED
#include "process_midi.h"
#endif
#endif // MIDI_ENABLE
#ifdef AUDIO_ENABLE
#include "audio.h"
#include "process_audio.h"
#ifdef AUDIO_CLICKY
#include "process_clicky.h"
#endif // AUDIO_CLICKY
#endif
#ifdef STENO_ENABLE
#include "process_steno.h"
#endif
#if defined(AUDIO_ENABLE) || (defined(MIDI_ENABLE) && defined(MIDI_BASIC))
#include "process_music.h"
#endif
#ifdef LEADER_ENABLE
#include "process_leader.h"
#endif
#ifdef UNICODE_ENABLE
#include "process_unicode.h"
#endif
#ifdef UCIS_ENABLE
#include "process_ucis.h"
#endif
#ifdef UNICODEMAP_ENABLE
#include "process_unicodemap.h"
#endif
#ifdef TAP_DANCE_ENABLE
#include "process_tap_dance.h"
#endif
#ifdef PRINTING_ENABLE
#include "process_printer.h"
#endif
#ifdef AUTO_SHIFT_ENABLE
#include "process_auto_shift.h"
#endif
#ifdef COMBO_ENABLE
#include "process_combo.h"
#endif
#ifdef KEY_LOCK_ENABLE
#include "process_key_lock.h"
#endif
#ifdef TERMINAL_ENABLE
#include "process_terminal.h"
#else
#include "process_terminal_nop.h"
#endif
#ifdef HD44780_ENABLE
#include "hd44780.h"
#endif
#ifdef HAPTIC_ENABLE
#include "haptic.h"
#endif
#ifdef OLED_DRIVER_ENABLE
#include "oled_driver.h"
#endif
//Function substitutions to ease GPIO manipulation
#ifdef __AVR__
#define PIN_ADDRESS(p, offset) _SFR_IO8(ADDRESS_BASE + (p >> PORT_SHIFTER) + offset)
#define pin_t uint8_t
#define setPinInput(pin) PIN_ADDRESS(pin, 1) &= ~ _BV(pin & 0xF)
#define setPinInputHigh(pin) ({\
PIN_ADDRESS(pin, 1) &= ~ _BV(pin & 0xF);\
PIN_ADDRESS(pin, 2) |= _BV(pin & 0xF);\
})
#define setPinInputLow(pin) _Static_assert(0, "AVR Processors cannot impliment an input as pull low")
#define setPinOutput(pin) PIN_ADDRESS(pin, 1) |= _BV(pin & 0xF)
#define writePinHigh(pin) PIN_ADDRESS(pin, 2) |= _BV(pin & 0xF)
#define writePinLow(pin) PIN_ADDRESS(pin, 2) &= ~_BV(pin & 0xF)
static inline void writePin(pin_t pin, uint8_t level){
if (level){
PIN_ADDRESS(pin, 2) |= _BV(pin & 0xF);
} else {
PIN_ADDRESS(pin, 2) &= ~_BV(pin & 0xF);
}
}
#define readPin(pin) ((bool)(PIN_ADDRESS(pin, 0) & _BV(pin & 0xF)))
#elif defined(PROTOCOL_CHIBIOS)
#define pin_t ioline_t
#define setPinInput(pin) palSetLineMode(pin, PAL_MODE_INPUT)
#define setPinInputHigh(pin) palSetLineMode(pin, PAL_MODE_INPUT_PULLUP)
#define setPinInputLow(pin) palSetLineMode(pin, PAL_MODE_INPUT_PULLDOWN)
#define setPinOutput(pin) palSetLineMode(pin, PAL_MODE_OUTPUT_PUSHPULL)
#define writePinHigh(pin) palSetLine(pin)
#define writePinLow(pin) palClearLine(pin)
static inline void writePin(pin_t pin, uint8_t level){
if (level){
palSetLine(pin);
} else {
palClearLine(pin);
}
}
#define readPin(pin) palReadLine(pin)
#endif
#define STRINGIZE(z) #z
#define ADD_SLASH_X(y) STRINGIZE(\x ## y)
#define SYMBOL_STR(x) ADD_SLASH_X(x)
#define SS_TAP_CODE 1
#define SS_DOWN_CODE 2
#define SS_UP_CODE 3
#define SS_TAP(keycode) "\1" SYMBOL_STR(keycode)
#define SS_DOWN(keycode) "\2" SYMBOL_STR(keycode)
#define SS_UP(keycode) "\3" SYMBOL_STR(keycode)
#define SS_LCTRL(string) SS_DOWN(X_LCTRL) string SS_UP(X_LCTRL)
#define SS_LGUI(string) SS_DOWN(X_LGUI) string SS_UP(X_LGUI)
#define SS_LCMD(string) SS_LGUI(string)
#define SS_LWIN(string) SS_LGUI(string)
#define SS_LALT(string) SS_DOWN(X_LALT) string SS_UP(X_LALT)
#define SS_LSFT(string) SS_DOWN(X_LSHIFT) string SS_UP(X_LSHIFT)
#define SS_RALT(string) SS_DOWN(X_RALT) string SS_UP(X_RALT)
#define SS_ALGR(string) SS_RALT(string)
#define SEND_STRING(str) send_string_P(PSTR(str))
extern const bool ascii_to_shift_lut[0x80];
extern const bool ascii_to_altgr_lut[0x80];
extern const uint8_t ascii_to_keycode_lut[0x80];
void send_string(const char *str);
void send_string_with_delay(const char *str, uint8_t interval);
void send_string_P(const char *str);
void send_string_with_delay_P(const char *str, uint8_t interval);
void send_char(char ascii_code);
// For tri-layer
void update_tri_layer(uint8_t layer1, uint8_t layer2, uint8_t layer3);
uint32_t update_tri_layer_state(uint32_t state, uint8_t layer1, uint8_t layer2, uint8_t layer3);
void set_single_persistent_default_layer(uint8_t default_layer);
void tap_random_base64(void);
#define IS_LAYER_ON(layer) (layer_state & (1UL << (layer)))
#define IS_LAYER_OFF(layer) (~layer_state & (1UL << (layer)))
void matrix_init_kb(void);
void matrix_scan_kb(void);
void matrix_init_user(void);
void matrix_scan_user(void);
uint16_t get_record_keycode(keyrecord_t *record);
uint16_t get_event_keycode(keyevent_t event);
bool process_action_kb(keyrecord_t *record);
bool process_record_kb(uint16_t keycode, keyrecord_t *record);
bool process_record_user(uint16_t keycode, keyrecord_t *record);
#ifndef BOOTMAGIC_LITE_COLUMN
#define BOOTMAGIC_LITE_COLUMN 0
#endif
#ifndef BOOTMAGIC_LITE_ROW
#define BOOTMAGIC_LITE_ROW 0
#endif
void bootmagic_lite(void);
void reset_keyboard(void);
void startup_user(void);
void shutdown_user(void);
void register_code16(uint16_t code);
void unregister_code16(uint16_t code);
void tap_code16(uint16_t code);
#ifdef BACKLIGHT_ENABLE
void backlight_init_ports(void);
void backlight_task(void);
void backlight_task_internal(void);
void backlight_on(uint8_t backlight_pin);
void backlight_off(uint8_t backlight_pin);
#ifdef BACKLIGHT_BREATHING
void breathing_task(void);
void breathing_enable(void);
void breathing_pulse(void);
void breathing_disable(void);
void breathing_self_disable(void);
void breathing_toggle(void);
bool is_breathing(void);
void breathing_intensity_default(void);
void breathing_period_default(void);
void breathing_period_set(uint8_t value);
void breathing_period_inc(void);
void breathing_period_dec(void);
#endif
#endif
void send_dword(uint32_t number);
void send_word(uint16_t number);
void send_byte(uint8_t number);
void send_nibble(uint8_t number);
uint16_t hex_to_keycode(uint8_t hex);
void led_set_user(uint8_t usb_led);
void led_set_kb(uint8_t usb_led);
void api_send_unicode(uint32_t unicode);
#endif
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