diff --git a/ch32v-insert-coin/src/main.rs b/ch32v-insert-coin/src/main.rs
index 97f7bc3..3f9e9ef 100644
--- a/ch32v-insert-coin/src/main.rs
+++ b/ch32v-insert-coin/src/main.rs
@@ -4,9 +4,11 @@
 #![feature(impl_trait_in_assoc_type)]
 
 use adpcm_pwm_dac::dac::DpcmDac;
-use hal::delay::Delay;
-use hal::gpio::{AnyPin, Level, Output, Pin};
 use {ch32_hal as hal};
+use hal::peripherals::EXTI4;
+use hal::{bind_interrupts, interrupt};
+use hal::delay::Delay;
+use hal::gpio::{AnyPin, Level, Input, Output, Pin, Pull};
 use hal::time::Hertz;
 use hal::timer::low_level::CountingMode;
 use hal::timer::simple_pwm::{PwmPin, SimplePwm};
@@ -30,6 +32,7 @@ const DPCM_DAC_DATA: [u8; 4] = [0xBB, 0xBB, 0xAA, 0xAA];
 // const DATA2: [u8; 1] = [0x00u8];
 
 
+static mut IRQ1_FLAG: bool = false;
 
 struct SimplePwmDacPin<'d, T: GeneralInstance16bit>{
     pin: SimplePwm<'d, T>,
@@ -95,6 +98,15 @@ fn pwm_blink<T: GeneralInstance16bit>(mut pwm_dac_pin: SimplePwmDacPin<'_, T>) {
 //     }
 // }
 
+
+#[qingke_rt::interrupt]
+fn EXTI4(){
+    unsafe{IRQ1_FLAG = true;};
+}
+// bind_interrupts!(struct Irqs {
+//     EXTI4 => button_press();
+// });
+
 #[qingke_rt::entry]
 fn main() -> ! {
     let mut config = hal::Config::default();
@@ -102,6 +114,12 @@ fn main() -> ! {
     let p = hal::init(config);
 
 
+    // button 1 setup
+    // let b1 = Input::new(p.PA2, Pull::Up);
+
+    // p.EXTI4
+    let ei = hal::exti::ExtiInput::new(p.PD4, p.EXTI4, Pull::Up);
+
     // let led_pin = PwmPin::new_ch4::<0>(p.PD0);
     // let ch = hal::timer::Channel::Ch4;
     // let mut pwm = SimplePwm::new(
@@ -120,6 +138,8 @@ fn main() -> ! {
     // LED output setup
     let mut led = Output::new(p.PD0, Level::Low, Default::default());
 
+    // LED1 output setup
+    let mut led1 = Output::new(p.PD6, Level::High, Default::default());
     
 
     // PWM DAC output pin setup
@@ -160,10 +180,22 @@ fn main() -> ! {
     let led_blink_rate_hz = 3; 
     let led_tick_per_service = (tick_rate_hz/(led_blink_rate_hz * 2));
 
+    // LED1 servicer vars
+    let mut led1_need_service = false;
+
 
     // pwm_blink(pwm_dac_pin);    
     let mut tick: usize = 0;
     loop{
+        // handle IRQ flags
+        unsafe {
+            if(IRQ1_FLAG) {
+                led1_need_service = true;
+                // led_active = true;
+                IRQ1_FLAG = false;
+            }
+        }
+
         let dac_need_service = ((tick % dac_tick_per_service) == 0);
         if(dac_need_service && dac_active) {
             dac_active = dac.output_next();
@@ -173,6 +205,12 @@ fn main() -> ! {
         if(led_need_service && led_active) {
             led.toggle();
         }
+
+        if led1_need_service {
+            led1.set_low();
+            led1_need_service = false;
+        }
+
         tick = tick.wrapping_add(1);
         delay.delay_us(tick_interval as u32);
     };
@@ -182,4 +220,5 @@ fn main() -> ! {
 #[panic_handler]
 fn panic(info: &core::panic::PanicInfo) -> ! {
     loop {}
-}
\ No newline at end of file
+}
+