95 lines
3.2 KiB
C
95 lines
3.2 KiB
C
#include "backlight.h"
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#include "mgos_stmpe610.h"
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static float backlight_duty;
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static float backlight_target_duty;
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static float backlight_step;
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static mgos_timer_id backlight_fader_timer_id = 0;
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static mgos_timer_id backlight_keepalive_timer_id = 0;
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static double backlight_last_keepalive;
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static void backlight_fader_cb(void *arg) {
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float new_duty = backlight_duty+backlight_step;
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LOG(LL_DEBUG,("Set backlight from %.2f to %.2f, step %.4f, target %.2f", backlight_duty, new_duty, backlight_step, backlight_target_duty));
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backlight_duty = new_duty;
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if (backlight_duty>1.0) backlight_duty=1.0;
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if (backlight_duty<0.0) backlight_duty=0.0;
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mgos_pwm_set(mgos_sys_config_get_app_backlight_pin(), BACKLIGHT_PWM_HZ, backlight_duty);
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if (backlight_step<0 && backlight_duty>backlight_target_duty)
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return;
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if (backlight_step>0 && backlight_duty<backlight_target_duty)
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return;
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mgos_clear_timer(backlight_fader_timer_id);
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backlight_fader_timer_id=0;
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backlight_step=0.0;
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backlight_target_duty=backlight_duty;
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LOG(LL_INFO,("Backlight target reached, set at %.2f", backlight_duty));
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(void) arg;
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}
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static void backlight_set(float new_duty, int fader_msec) {
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if (new_duty<0.0) backlight_target_duty=0.0;
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else if (new_duty>1.0) backlight_target_duty=1.0;
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else backlight_target_duty=new_duty;
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if (backlight_target_duty == backlight_duty)
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return;
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if (backlight_fader_timer_id) {
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LOG(LL_INFO, ("Cancelling current backlight_fader_timer due to new settings"));
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mgos_clear_timer(backlight_fader_timer_id);
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backlight_fader_timer_id=0;
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}
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if (fader_msec == 0) {
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backlight_duty=backlight_target_duty;
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backlight_step=0.0;
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LOG(LL_INFO, ("Setting backlight to %.2f", backlight_duty));
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mgos_pwm_set(mgos_sys_config_get_app_backlight_pin(), BACKLIGHT_PWM_HZ, backlight_duty);
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return;
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}
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backlight_step = (backlight_target_duty - backlight_duty) / ((1000.0*fader_msec)/BACKLIGHT_STEP_USEC);
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LOG(LL_INFO, ("Changing backlight from %.2f to %.2f in %d msecs, steps of %.4f", backlight_duty, backlight_target_duty, fader_msec, backlight_step));
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backlight_fader_timer_id = mgos_set_timer(BACKLIGHT_STEP_USEC/1000, true, backlight_fader_cb, NULL);
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}
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static void backlight_keepalive_cb(void *arg) {
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// Extend the keepalive if the current state is TOUCH_DOWN
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if (mgos_stmpe610_is_touching()) {
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LOG(LL_DEBUG, ("SMTPE610 is touching, extending keepalive"));
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backlight_keepalive();
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return;
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}
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// We trigger a fade if:
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// - current time is more than 3sec since our last keepalive
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// - backlight_duty>0: the screen is on
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// - backlight_fader_timer_id==0: we are not currenty fading
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if ((mg_time() > backlight_last_keepalive + mgos_sys_config_get_app_inactivity_timeout()) && backlight_duty>0 && backlight_fader_timer_id==0) {
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LOG(LL_INFO, ("Inactivity timeout of %d seconds reached, setting backlight off", mgos_sys_config_get_app_inactivity_timeout()));
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backlight_set(0.0, 1500);
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}
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(void) arg;
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}
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void backlight_keepalive() {
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backlight_last_keepalive=mg_time();
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backlight_set(1.0, 0);
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}
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bool backlight_active() {
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return (backlight_duty>0.0);
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}
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void backlight_init(void) {
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backlight_keepalive();
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backlight_keepalive_timer_id = mgos_set_timer(1000, true, backlight_keepalive_cb, NULL);
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return;
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}
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