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Reduce display idle power usage #11

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Merged
jayyao97 merged 1 commit into from
Jul 20, 2026
Merged

Reduce display idle power usage #11

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44 changes: 34 additions & 10 deletions src/main.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@
namespace {

constexpr uint32_t kUiRefreshMs = 1000;
constexpr uint32_t kScreenOffLvglRefreshMs = 50;
constexpr uint32_t kIdleScreenTimeoutMs = 15 * 1000;
constexpr uint32_t kRunningScreenTimeoutMs = 60 * 1000;
constexpr uint32_t kDataStaleMs = 60 * 1000;
Expand Down Expand Up @@ -49,6 +50,7 @@ volatile bool touch_pending = false;
AppState app_state;
uint32_t state_received_at_ms = 0;
uint32_t last_ui_refresh_ms = 0;
uint32_t last_lvgl_refresh_ms = 0;
uint32_t last_activity_ms = 0;
bool screen_on = true;
bool power_ready = false;
Expand All @@ -70,7 +72,13 @@ void setScreenOn(bool on) {
return;
}
screen_on = on;
display->setBrightness(on ? board::kDisplayBrightness : 0);
if (on) {
display->displayOn();
display->setBrightness(board::kDisplayBrightness);
} else {
display->setBrightness(0);
display->displayOff();
}
}

void IRAM_ATTR onTouchInterrupt() {
Expand All @@ -85,6 +93,17 @@ bool consumeTouchInterrupt() {
return pending;
}

void updateTouchWake() {
if (screen_on || !consumeTouchInterrupt()) {
return;
}

touch.getPoint(touch_x, touch_y, touch.getSupportTouchPoint());
Serial.println("[display] wake by touch");
setScreenOn(true);
last_activity_ms = millis();
}

void displayFlush(lv_disp_drv_t* driver, const lv_area_t* area,
lv_color_t* pixels) {
const uint32_t width = area->x2 - area->x1 + 1;
Expand Down Expand Up @@ -131,13 +150,6 @@ void readTouch(lv_indev_drv_t*, lv_indev_data_t* data) {
return;
}

if (!screen_on) {
setScreenOn(true);
last_activity_ms = millis();
data->state = LV_INDEV_STATE_REL;
return;
}

last_activity_ms = millis();
data->state = LV_INDEV_STATE_PR;
data->point.x = touch_x[0];
Expand Down Expand Up @@ -327,6 +339,10 @@ void updateButtons() {
}

void refreshUi() {
if (!screen_on) {
return;
}

const uint32_t now = millis();
if (now - last_ui_refresh_ms < kUiRefreshMs) {
return;
Expand Down Expand Up @@ -425,16 +441,24 @@ void setup() {

void loop() {
updateButtons();
updateTouchWake();
updateBle();
refreshUi();
lv_timer_handler();

const uint32_t lvgl_now = millis();
if (screen_on ||
lvgl_now - last_lvgl_refresh_ms >= kScreenOffLvglRefreshMs) {
last_lvgl_refresh_ms = lvgl_now;
lv_timer_handler();
}

const uint32_t now = millis();
const uint32_t screen_timeout_ms =
app_state.data_valid && app_state.active_threads > 0
? kRunningScreenTimeoutMs
: kIdleScreenTimeoutMs;
if (screen_on && !uiPairingCodeVisible() &&
millis() - last_activity_ms >= screen_timeout_ms) {
now - last_activity_ms >= screen_timeout_ms) {
setScreenOn(false);
}

Expand Down