161 lines
5.8 KiB
C
161 lines
5.8 KiB
C
#include "quantum.h"
|
|
#include "backlight.h"
|
|
#include <hal.h>
|
|
#include "debug.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 5
|
|
# 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
|
|
|
|
static PWMConfig pwmCFG = {0xFFFF, /* PWM clock frequency */
|
|
256, /* PWM period (in ticks) 1S (1/10kHz=0.1mS 0.1ms*10000 ticks=1S) */
|
|
NULL, /* 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;
|
|
}
|
|
}
|
|
|
|
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
|
|
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};
|
|
|
|
void breathing_callback(PWMDriver *pwmp);
|
|
|
|
bool is_breathing(void) { return pwmCFG.callback != NULL; }
|
|
|
|
void breathing_enable(void) {
|
|
pwmCFG.callback = breathing_callback;
|
|
pwmEnablePeriodicNotification(&BACKLIGHT_PWM_DRIVER);
|
|
}
|
|
|
|
void breathing_disable(void) {
|
|
pwmCFG.callback = NULL;
|
|
pwmDisablePeriodicNotification(&BACKLIGHT_PWM_DRIVER);
|
|
|
|
// 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(); }
|
|
|
|
void breathing_callback(PWMDriver *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.
|
|
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(pwmp, 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
|