From 472e43056dc03b4978611117520cb03867b16576 Mon Sep 17 00:00:00 2001
From: sigil-03 <sigil@glyphs.tech>
Date: Sat, 15 Nov 2025 16:23:18 -0700
Subject: [PATCH 1/2] add systick disable

---
 ch32v-insert-coin/src/main.rs | 45 +++++++----------------------------
 1 file changed, 8 insertions(+), 37 deletions(-)

diff --git a/ch32v-insert-coin/src/main.rs b/ch32v-insert-coin/src/main.rs
index 9e6ea47..4556f25 100644
--- a/ch32v-insert-coin/src/main.rs
+++ b/ch32v-insert-coin/src/main.rs
@@ -239,6 +239,13 @@ fn systick_init(tick_freq_hz: usize) {
         w.set_stclk(ch32_hal::pac::systick::vals::Stclk::HCLK_DIV8); // HCLK/8 clock source
     });
 }
+fn systick_stop() {
+    let r = &ch32_hal::pac::SYSTICK;
+    // Reset SysTick
+    r.ctlr().write(|w| {
+        // Start with everything disabled
+    });
+}
 
 bind_interrupts!(struct Irqs {
     EXTI7_0 => Test;
@@ -561,6 +568,7 @@ use ch32_hal::timer::Channel;
 
 // fn shutdown_main(p: Peripherals) {
 fn shutdown_main(p: hal::Peripherals) {
+    systick_stop();
     // LED0 output setup
     let led0_pin = OutputOpenDrain::new(p.PC3, Level::Low, Default::default());
     let led1_pin = OutputOpenDrain::new(p.PD2, Level::High, Default::default());
@@ -595,43 +603,6 @@ fn shutdown_main(p: hal::Peripherals) {
             }
         }
     }
-
-    // loop {
-    //     unsafe {
-    //         #[allow(static_mut_refs)]
-    //         INPUT_FLAGS.sense_coin_flag.clear();
-    //         #[allow(static_mut_refs)]
-    //         INPUT_FLAGS.main_btn_flag.clear();
-    //     }
-    //     unsafe { system::enter_standby() };
-    //     riscv::asm::wfi();
-    //     unsafe {
-    //         #[allow(static_mut_refs)]
-    //         if (INPUT_FLAGS.sense_coin_flag.active()
-    //             || (INPUT_FLAGS.main_btn_flag.active() && main_btn_input.is_high_immediate()))
-    //             && app.should_wake()
-    //         {
-    //             break;
-    //         }
-    //     }
-    // }
-    // let mut config = hal::Config::default();
-    // config.rcc = hal::rcc::Config::SYSCLK_FREQ_48MHZ_HSI;
-    // unsafe {
-    //     hal::rcc::init(config.rcc);
-    // }
-    // unsafe {
-    //     use hal::pac::Interrupt;
-    //     use qingke::interrupt::Priority;
-    //     use qingke_rt::CoreInterrupt;
-
-    //     system::clear_interrupt(2, 6);
-
-    //     qingke::pfic::set_priority(CoreInterrupt::SysTick as u8, Priority::P15 as u8);
-
-    //     qingke::pfic::enable_interrupt(Interrupt::EXTI7_0 as u8);
-    //     qingke::pfic::enable_interrupt(CoreInterrupt::SysTick as u8);
-    // }
 }
 
 #[qingke_rt::entry]

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 2/2] 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());