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Backlight support. TOUCH events feed backlight_keepalive(); After a timeout, we fade the backlight to 0 using timers. When the backlight is not active, TOUCH events are not passed to widgets, but the backlight is re-enabled; Add some flags to mos.yml to drive timeout and PWM pin for the backlight on Featherwing

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Pim van Pelt
2017-11-27 21:30:01 +01:00
parent 5f10481fb7
commit d07a0e053c
5 changed files with 118 additions and 0 deletions
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src/backlight.c Normal file
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#include "backlight.h"
static float backlight_duty;
static float backlight_target_duty;
static float backlight_step;
static mgos_timer_id backlight_fader_timer_id = 0;
static mgos_timer_id backlight_keepalive_timer_id = 0;
static void backlight_fader_cb(void *arg) {
float new_duty = backlight_duty+backlight_step;
LOG(LL_DEBUG,("Set backlight from %.2f to %.2f, step %.4f, target %.2f", backlight_duty, new_duty, backlight_step, backlight_target_duty));
backlight_duty = new_duty;
if (backlight_duty>1.0) backlight_duty=1.0;
if (backlight_duty<0.0) backlight_duty=0.0;
mgos_pwm_set(mgos_sys_config_get_app_backlight_pin(), BACKLIGHT_PWM_HZ, backlight_duty);
if (backlight_step<0 && backlight_duty>backlight_target_duty)
return;
if (backlight_step>0 && backlight_duty<backlight_target_duty)
return;
mgos_clear_timer(backlight_fader_timer_id);
backlight_fader_timer_id=0;
backlight_step=0.0;
backlight_target_duty=backlight_duty;
LOG(LL_INFO,("Backlight target reached, set at %.2f", backlight_duty));
(void) arg;
}
void backlight_set(float new_duty, int fader_msec) {
if (new_duty<0.0) backlight_target_duty=0.0;
else if (new_duty>1.0) backlight_target_duty=1.0;
else backlight_target_duty=new_duty;
if (backlight_target_duty == backlight_duty)
return;
if (fader_msec == 0) {
backlight_duty=backlight_target_duty;
backlight_step=0.0;
LOG(LL_INFO, ("Setting backlight to %.2f", backlight_duty));
mgos_pwm_set(mgos_sys_config_get_app_backlight_pin(), BACKLIGHT_PWM_HZ, backlight_duty);
return;
}
backlight_step = (backlight_target_duty - backlight_duty) / ((1000.0*fader_msec)/BACKLIGHT_STEP_USEC);
LOG(LL_INFO, ("Changing backlight from %.2f to %.2f in %d msecs, steps of %.4f", backlight_duty, backlight_target_duty, fader_msec, backlight_step));
if (backlight_fader_timer_id)
mgos_clear_timer(backlight_fader_timer_id);
backlight_fader_timer_id = mgos_set_timer(BACKLIGHT_STEP_USEC/1000, true, backlight_fader_cb, NULL);
}
static void backlight_keepalive_cb(void *arg) {
LOG(LL_INFO, ("Inactivity timeout of %d seconds reached, setting backlight off", mgos_sys_config_get_app_inactivity_timeout()));
backlight_set(0.0, 1000);
(void) arg;
}
void backlight_keepalive() {
if (backlight_keepalive_timer_id)
mgos_clear_timer(backlight_keepalive_timer_id);
backlight_keepalive_timer_id = mgos_set_timer(mgos_sys_config_get_app_inactivity_timeout()*1000, false, backlight_keepalive_cb, NULL);
backlight_set(1.0, 0);
}
bool backlight_active() {
return (backlight_duty>0.0);
}
void backlight_init(void) {
backlight_keepalive();
return;
}