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#include "quantum.h"
#include "backlight.h"
#include <hal.h>
#include "debug.h"
// TODO: remove short term bodge when refactoring BACKLIGHT_CUSTOM_DRIVER out
#ifdef BACKLIGHT_PIN
# if defined(STM32F0XX) || defined(STM32F0xx)
# pragma message("Backlight support for STMF072 has had limited testing, YMMV. If unsure, set 'BACKLIGHT_ENABLE = no' in your rules.mk")
# endif
// GPIOV2 && GPIOV3
# ifndef BACKLIGHT_PAL_MODE
# define BACKLIGHT_PAL_MODE 2
# endif
// GENERIC
# ifndef BACKLIGHT_PWM_DRIVER
# define BACKLIGHT_PWM_DRIVER PWMD4
# endif
# ifndef BACKLIGHT_PWM_CHANNEL
# define BACKLIGHT_PWM_CHANNEL 3
# endif
static void breathing_callback(PWMDriver *pwmp);
static PWMConfig pwmCFG = {0xFFFF, /* PWM clock frequency */
256, /* PWM period (in ticks) 1S (1/10kHz=0.1mS 0.1ms*10000 ticks=1S) */
NULL, /* No Callback */
{ /* Default all channels to disabled - Channels will be configured durring init */
{PWM_OUTPUT_DISABLED, NULL},
{PWM_OUTPUT_DISABLED, NULL},
{PWM_OUTPUT_DISABLED, NULL},
{PWM_OUTPUT_DISABLED, NULL}},
0, /* HW dependent part.*/
0};
static PWMConfig pwmCFG_breathing = {0xFFFF, /** PWM clock frequency */
256, /* PWM period (in ticks) 1S (1/10kHz=0.1mS 0.1ms*10000 ticks=1S) */
breathing_callback, /* Breathing Callback */
{ /* Default all channels to disabled - Channels will be configured durring init */
{PWM_OUTPUT_DISABLED, NULL},
{PWM_OUTPUT_DISABLED, NULL},
{PWM_OUTPUT_DISABLED, NULL},
{PWM_OUTPUT_DISABLED, NULL}},
0, /* HW dependent part.*/
0};
// 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) {
// printf("backlight_init_ports()\n");
# ifdef USE_GPIOV1
palSetPadMode(PAL_PORT(BACKLIGHT_PIN), PAL_PAD(BACKLIGHT_PIN), PAL_MODE_STM32_ALTERNATE_PUSHPULL);
# 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_ACTIVE_HIGH;
pwmCFG_breathing.channels[BACKLIGHT_PWM_CHANNEL - 1].mode = PWM_OUTPUT_ACTIVE_HIGH;
pwmStart(&BACKLIGHT_PWM_DRIVER, &pwmCFG);
backlight_set(get_backlight_level());
if (is_backlight_breathing()) {
breathing_enable();
}
}
void backlight_set(uint8_t level) {
// printf("backlight_set(%d)\n", level);
if (level == 0) {
// Turn backlight off
pwmDisableChannel(&BACKLIGHT_PWM_DRIVER, BACKLIGHT_PWM_CHANNEL - 1);
} else {
// Turn backlight on
if (!is_breathing()) {
uint32_t duty = (uint32_t)(cie_lightness(0xFFFF * (uint32_t)level / BACKLIGHT_LEVELS));
// printf("duty: (%d)\n", duty);
pwmEnableChannel(&BACKLIGHT_PWM_DRIVER, BACKLIGHT_PWM_CHANNEL - 1, PWM_FRACTION_TO_WIDTH(&BACKLIGHT_PWM_DRIVER, 0xFFFF, duty));
}
}
}
uint8_t backlight_tick = 0;
void backlight_task(void) {}
# 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;
bool is_breathing(void) { return BACKLIGHT_PWM_DRIVER.config == &pwmCFG_breathing; }
static inline void breathing_min(void) { breathing_counter = 0; }
static inline void breathing_max(void) { breathing_counter = get_breathing_period() * 256 / 2; }
void breathing_interrupt_enable(void) {
pwmStop(&BACKLIGHT_PWM_DRIVER);
pwmStart(&BACKLIGHT_PWM_DRIVER, &pwmCFG_breathing);
chSysLockFromISR();
pwmEnablePeriodicNotification(&BACKLIGHT_PWM_DRIVER);
pwmEnableChannelI(&BACKLIGHT_PWM_DRIVER, BACKLIGHT_PWM_CHANNEL - 1, PWM_FRACTION_TO_WIDTH(&BACKLIGHT_PWM_DRIVER, 0xFFFF, 0xFFFF));
chSysUnlockFromISR();
}
void breathing_interrupt_disable(void) {
pwmStop(&BACKLIGHT_PWM_DRIVER);
pwmStart(&BACKLIGHT_PWM_DRIVER, &pwmCFG);
}
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) {
// printf("breathing_disable()\n");
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;
}
void breathing_toggle(void) {
if (is_breathing())
breathing_disable();
else
breathing_enable();
}
/* 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(); }
static void breathing_callback(PWMDriver *pwmp) {
(void)pwmp;
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;
if (((breathing_halt == BREATHING_HALT_ON) && (index == BREATHING_STEPS / 2)) || ((breathing_halt == BREATHING_HALT_OFF) && (index == BREATHING_STEPS - 1))) {
breathing_interrupt_disable();
}
uint32_t duty = cie_lightness(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();
}
#endif
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