diff --git a/src/main.rs b/src/main.rs
index 40df2c6..55d111b 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -3,17 +3,21 @@
 #![feature(type_alias_impl_trait)]
 #![feature(impl_trait_in_assoc_type)]
 
-use ch32_hal::i2c::Duty;
+use ch32_hal::i2c::{self, Duty};
+use ch32_hal::pac::{self, I2C1};
+use ch32_hal::println;
 use ch32_hal::time::Hertz;
 use embassy_executor::Spawner;
 use embassy_time::{Duration, Timer};
 use hal::bind_interrupts;
 use hal::gpio::{Level, Output};
 use hal::i2c::{Config, I2c, SlaveAddress, SlaveConfig};
+use hal::debug::SDIPrint;
 use hal::peripherals::USBD;
 use hal::usbd::InterruptHandler;
 use {ch32_hal as hal, panic_halt as _};
 
+
 bind_interrupts!(struct Irqs {
    USB_LP_CAN1_RX0 => InterruptHandler<USBD>;
    I2C1_EV => ch32_hal::i2c::EventInterruptHandler<ch32_hal::peripherals::I2C1>;
@@ -23,43 +27,35 @@ bind_interrupts!(struct Irqs {
 #[embassy_executor::main(entry = "qingke_rt::entry")]
 async fn main(_spawner: Spawner) -> ! {
     let p = hal::init(Default::default());
+    SDIPrint::enable();
 
-    let mut led = Output::new(p.PB2, Level::Low, Default::default());
-
-    let mut config = Config::default();
-    config.duty = Duty::Duty16_9;
-    let mut i2c_slave = I2c::new_blocking(p.I2C1, p.PB6, p.PB7, Hertz::khz(400), config)
+    let config = Config::default();
+    let mut i2c_slave = I2c::new_blocking(p.I2C1, p.PB6, p.PB7, Hertz::khz(100), config)
         .into_slave(SlaveConfig {
             address: SlaveAddress::SevenBit(0x55),
             general_call: false,
         });
 
-    let mut blinks: u8 = 8;
     loop {
-        Timer::after_millis(1000).await;
+        Timer::after_millis(10).await;
 
-        if blinks > 0 {
-            led.toggle();
-            if led.is_set_low() {
-                blinks -= 1;
-            }
-        } else {
-            if let Ok(command) = i2c_slave.listen_blocking() {
-                blinks = 1;
+        match i2c_slave.listen_blocking() {
+            Ok(command) => {
                 match command {
-                    ch32_hal::i2c::SlaveCommand::GeneralCall => { /* will not be triggered because we disabled it */ },
+                    ch32_hal::i2c::SlaveCommand::GeneralCall => { /* will not be triggered because we disabled it */
+                    }
                     ch32_hal::i2c::SlaveCommand::ReadCommand => {
                         // send empty response
-                        i2c_slave.blocking_write_timeout(&[0x01]);
-                    },
+                        let _ = i2c_slave.blocking_write_timeout(&[0x01]);
+                    }
                     ch32_hal::i2c::SlaveCommand::WriteCommand => {
                         let mut buf: [u8; 1] = [0x0];
-                        i2c_slave.blocking_read_timeout(&mut buf);
-                        blinks = buf[0];
-                    },
+                        let _ = i2c_slave.blocking_read_timeout(&mut buf);
+                    }
                 }
-            } else {
-                blinks = 2;
+            },
+            Err(err) => {
+                println!("{:?}", err)
             }
         }
     }