From 688a9bdbe9362a2d52b413e51ccb6d35d6dcf516 Mon Sep 17 00:00:00 2001
From: Sebastien Vayrette <vayrette@gmail.com>
Date: Wed, 18 Mar 2026 11:17:31 -0400
Subject: [PATCH] fix(uwb_tag): turn display ON after initialization and add
 button wake

- Display was never turned on after display.begin() in setup()
- Added SSD1306_DISPLAYON command after initialization
- Added short button press detection to wake display
- Fixes blank display issue reported by SAUL
---
 esp32/uwb_tag/src/main.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/esp32/uwb_tag/src/main.cpp b/esp32/uwb_tag/src/main.cpp
index fe48cb4..6ff653c 100644
--- a/esp32/uwb_tag/src/main.cpp
+++ b/esp32/uwb_tag/src/main.cpp
@@ -766,7 +766,7 @@ static void pm_update(void) {
             pm_enter_deep_sleep();
         }
     } else {
-        g_btn_held_ms = 0;
+        if (g_btn_held_ms > 0 && (now - g_btn_held_ms) < 1000) { g_pm_last_activity_ms = now; display.ssd1306_command(SSD1306_DISPLAYON); } g_btn_held_ms = 0;
     }
 }
 
@@ -969,6 +969,9 @@ void setup(void) {
         Serial.println("[uwb_tag] WARN: SSD1306 not found");
     } else {
         display.clearDisplay();
+        display.ssd1306_command(SSD1306_DISPLAYON);  // Turn display ON!
+        display.ssd1306_command(SSD1306_SETCONTRAST);
+        display.ssd1306_command(g_cfg.display_brightness);
         display.setTextSize(2);
         display.setTextColor(SSD1306_WHITE);
         display.setCursor(0, 0);