From d8477e3d2d6b74ce14b8a260b5ad6d4a06734fa8 Mon Sep 17 00:00:00 2001
From: sigil-03 <sigil@glyphs.tech>
Date: Sat, 15 Nov 2025 16:38:07 -0700
Subject: [PATCH] add usb power gating

---
 ch32v-insert-coin/src/main.rs | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/ch32v-insert-coin/src/main.rs b/ch32v-insert-coin/src/main.rs
index 4556f25..694ce75 100644
--- a/ch32v-insert-coin/src/main.rs
+++ b/ch32v-insert-coin/src/main.rs
@@ -261,8 +261,15 @@ fn app_main(mut p: hal::Peripherals, app_settings: Settings) -> Settings {
     let mut adc = hal::adc::Adc::new(p.ADC1, Default::default());
     let mut batt_monitor_pin = p.PD4;
     let mut adc_core = AdcCore::new(adc, batt_monitor_pin);
+
+    let mut usb_detect_pin = p.PD5;
+    let usb_detect_input = Input::new(usb_detect_pin, Pull::Up);
+    let usb = Usb::new(usb_detect_input);
+
     let bv = adc_core.get_battery_voltage();
-    if bv < 421 {
+
+    // if we don't have USB power, and the batt ADC reads under 421, don't wake
+    if !usb.powered() && bv < 421 {
         adc_core.shutdown();
         return app_settings;
     }
@@ -313,9 +320,6 @@ fn app_main(mut p: hal::Peripherals, app_settings: Settings) -> Settings {
 
     // adc2
     // let mut usb_detect_dc = hal::adc::Adc::new(p.ADC1, Default::default());
-    let mut usb_detect_pin = p.PD5;
-    let usb_detect_input = Input::new(usb_detect_pin, Pull::Up);
-    let usb = Usb::new(usb_detect_input);
 
     // println!("ADC_PIN CHANNEL: {}", adc_pin.channel().channel());