diff --git a/ch32v-insert-coin/src/main.rs b/ch32v-insert-coin/src/main.rs
index 694ce75..9e6ea47 100644
--- a/ch32v-insert-coin/src/main.rs
+++ b/ch32v-insert-coin/src/main.rs
@@ -239,13 +239,6 @@ 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;
@@ -261,15 +254,8 @@ 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 we don't have USB power, and the batt ADC reads under 421, don't wake
-    if !usb.powered() && bv < 421 {
+    if bv < 421 {
         adc_core.shutdown();
         return app_settings;
     }
@@ -320,6 +306,9 @@ 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());
 
@@ -572,7 +561,6 @@ 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());
@@ -607,6 +595,43 @@ 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]