diff --git a/Cargo.lock b/Cargo.lock
index 81f6882..15b43b6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -65,7 +65,6 @@ checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 [[package]]
 name = "ch32-hal"
 version = "0.1.0"
-source = "git+https://github.com/ch32-rs/ch32-hal#2b8e1c864ba5545ee65b1c77dcb17c86a471b70c"
 dependencies = [
  "ch32-metapac 0.1.0",
  "critical-section",
diff --git a/Cargo.toml b/Cargo.toml
index ce4fc45..619d9b0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -4,7 +4,8 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
-ch32-hal = { git = "https://github.com/ch32-rs/ch32-hal", features = [
+#ch32-hal = { git = "https://github.com/ch32-rs/ch32-hal", features = [
+ch32-hal = { path = "/home/judge/dev/github.com/ju6ge/ch32-hal", features = [
     "ch32v203c8t6",
     "memory-x",
     "embassy",
diff --git a/src/main.rs b/src/main.rs
index 3b2a650..00727b8 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -3,12 +3,13 @@
 #![feature(type_alias_impl_trait)]
 #![feature(impl_trait_in_assoc_type)]
 
-mod i2c_slave;
-
+use ch32_hal::i2c::Duty;
+use ch32_hal::time::Hertz;
 use embassy_executor::Spawner;
-use embassy_time::Timer;
+use embassy_time::{Duration, Timer};
 use hal::bind_interrupts;
 use hal::gpio::{Level, Output};
+use hal::i2c::{Config, I2c, SlaveAddress, SlaveConfig};
 use hal::peripherals::USBD;
 use hal::usbd::InterruptHandler;
 use {ch32_hal as hal, panic_halt as _};
@@ -23,11 +24,41 @@ async fn main(_spawner: Spawner) -> ! {
 
     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)
+        .into_slave(SlaveConfig {
+            address: SlaveAddress::SevenBit(0x55),
+            general_call: false,
+        });
+
+    let mut blinks: u8 = 8;
     loop {
         Timer::after_millis(1000).await;
 
-        //class.write_packet(b"hello world from embassy main\r\n").await;
-
-        led.toggle();
+        if blinks > 0 {
+            led.toggle();
+            if led.is_set_low() {
+                blinks -= 1;
+            }
+        } else {
+            if let Ok(command) = i2c_slave.listen_blocking() {
+                blinks = 1;
+                match command {
+                    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]);
+                    },
+                    ch32_hal::i2c::SlaveCommand::WriteCommand => {
+                        let mut buf: [u8; 1] = [0x0];
+                        i2c_slave.blocking_read_timeout(&mut buf);
+                        blinks = buf[0];
+                    },
+                }
+            } else {
+                blinks = 2;
+            }
+        }
     }
 }