diff --git a/.gdbinit b/.gdbinit
index 3263f19..6953b41 100644
--- a/.gdbinit
+++ b/.gdbinit
@@ -2,6 +2,6 @@ target extended-remote :3333
 set remotetimeout 2000
 
 #symbol-file target/riscv32imc-unknown-none-elf/release/ch32v203-examples
-file target/riscv32imc-unknown-none-elf/release/bms
+file target/riscv32imc-unknown-none-elf/debug/bms
 
 monitor reset halt
diff --git a/Cargo.lock b/Cargo.lock
index 81f6882..ec35180 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -32,6 +32,12 @@ version = "0.14.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2d7e60934ceec538daadb9d8432424ed043a904d8e0243f3c6446bce549a46ac"
 
+[[package]]
+name = "bitmaps"
+version = "3.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a1d084b0137aaa901caf9f1e8b21daa6aa24d41cd806e111335541eff9683bd6"
+
 [[package]]
 name = "bms"
 version = "0.1.0"
@@ -40,14 +46,14 @@ dependencies = [
  "ch32-metapac 0.0.6",
  "embassy-executor",
  "embassy-futures",
- "embassy-time",
+ "embassy-time 0.4.0",
  "embassy-usb",
  "embedded-hal 1.0.0",
  "heapless",
  "micromath",
  "panic-halt",
- "qingke",
- "qingke-rt",
+ "qingke 0.5.0",
+ "qingke-rt 0.5.0",
 ]
 
 [[package]]
@@ -65,17 +71,19 @@ checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 [[package]]
 name = "ch32-hal"
 version = "0.1.0"
-source = "git+https://github.com/ch32-rs/ch32-hal#2b8e1c864ba5545ee65b1c77dcb17c86a471b70c"
+source = "git+https://github.com/ju6ge/ch32-hal?branch=feature%2Fi2c-slave-api#9b1df89f5e8de21c7daad0f22fa7186dcfcbecdf"
 dependencies = [
+ "bitmaps",
  "ch32-metapac 0.1.0",
  "critical-section",
  "embassy-futures",
  "embassy-hal-internal",
- "embassy-sync",
- "embassy-time",
+ "embassy-sync 0.7.2",
+ "embassy-time 0.5.0",
  "embassy-time-driver",
  "embassy-time-queue-utils",
- "embassy-usb-driver",
+ "embassy-usb-driver 0.2.0",
+ "embedded-can",
  "embedded-hal 0.2.7",
  "embedded-hal 1.0.0",
  "embedded-hal-async",
@@ -83,8 +91,8 @@ dependencies = [
  "futures",
  "nb 1.1.0",
  "proc-macro2",
- "qingke",
- "qingke-rt",
+ "qingke 0.6.1",
+ "qingke-rt 0.6.1",
  "quote",
  "rand_core",
  "sdio-host",
@@ -182,6 +190,12 @@ dependencies = [
  "syn 2.0.101",
 ]
 
+[[package]]
+name = "embassy-executor-timer-queue"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2fc328bf943af66b80b98755db9106bf7e7471b0cf47dc8559cd9a6be504cc9c"
+
 [[package]]
 name = "embassy-futures"
 version = "0.1.1"
@@ -190,9 +204,9 @@ checksum = "1f878075b9794c1e4ac788c95b728f26aa6366d32eeb10c7051389f898f7d067"
 
 [[package]]
 name = "embassy-hal-internal"
-version = "0.2.0"
+version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0ef3bac31ec146321248a169e9c7b5799f1e0b3829c7a9b324cb4600a7438f59"
+checksum = "95285007a91b619dc9f26ea8f55452aa6c60f7115a4edc05085cd2bd3127cd7a"
 dependencies = [
  "num-traits",
 ]
@@ -211,7 +225,7 @@ checksum = "4818c32afec43e3cae234f324bad9a976c9aa7501022d26ff60a4017a1a006b7"
 dependencies = [
  "embassy-futures",
  "embassy-net-driver",
- "embassy-sync",
+ "embassy-sync 0.6.2",
 ]
 
 [[package]]
@@ -228,6 +242,20 @@ dependencies = [
  "heapless",
 ]
 
+[[package]]
+name = "embassy-sync"
+version = "0.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "73974a3edbd0bd286759b3d483540f0ebef705919a5f56f4fc7709066f71689b"
+dependencies = [
+ "cfg-if",
+ "critical-section",
+ "embedded-io-async",
+ "futures-core",
+ "futures-sink",
+ "heapless",
+]
+
 [[package]]
 name = "embassy-time"
 version = "0.4.0"
@@ -245,21 +273,37 @@ dependencies = [
 ]
 
 [[package]]
-name = "embassy-time-driver"
-version = "0.2.0"
+name = "embassy-time"
+version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8d45f5d833b6d98bd2aab0c2de70b18bfaa10faf661a1578fd8e5dfb15eb7eba"
+checksum = "f4fa65b9284d974dad7a23bb72835c4ec85c0b540d86af7fc4098c88cff51d65"
+dependencies = [
+ "cfg-if",
+ "critical-section",
+ "document-features",
+ "embassy-time-driver",
+ "embedded-hal 0.2.7",
+ "embedded-hal 1.0.0",
+ "embedded-hal-async",
+ "futures-core",
+]
+
+[[package]]
+name = "embassy-time-driver"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a0a244c7dc22c8d0289379c8d8830cae06bb93d8f990194d0de5efb3b5ae7ba6"
 dependencies = [
  "document-features",
 ]
 
 [[package]]
 name = "embassy-time-queue-utils"
-version = "0.1.0"
+version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dc55c748d16908a65b166d09ce976575fb8852cf60ccd06174092b41064d8f83"
+checksum = "80e2ee86063bd028a420a5fb5898c18c87a8898026da1d4c852af2c443d0a454"
 dependencies = [
- "embassy-executor",
+ "embassy-executor-timer-queue",
  "heapless",
 ]
 
@@ -271,8 +315,8 @@ checksum = "8d0b882133fa684b9d4652351cd7aac5afe8a2c2bf4a7da59f442ff61087cda2"
 dependencies = [
  "embassy-futures",
  "embassy-net-driver-channel",
- "embassy-sync",
- "embassy-usb-driver",
+ "embassy-sync 0.6.2",
+ "embassy-usb-driver 0.1.0",
  "heapless",
  "ssmarshal",
  "usbd-hid",
@@ -284,6 +328,24 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4fc247028eae04174b6635104a35b1ed336aabef4654f5e87a8f32327d231970"
 
+[[package]]
+name = "embassy-usb-driver"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "17119855ccc2d1f7470a39756b12068454ae27a3eabb037d940b5c03d9c77b7a"
+dependencies = [
+ "embedded-io-async",
+]
+
+[[package]]
+name = "embedded-can"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e9d2e857f87ac832df68fa498d18ddc679175cf3d2e4aa893988e5601baf9438"
+dependencies = [
+ "nb 1.1.0",
+]
+
 [[package]]
 name = "embedded-hal"
 version = "0.2.7"
@@ -578,14 +640,36 @@ dependencies = [
  "riscv 0.12.1",
 ]
 
+[[package]]
+name = "qingke"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "10318bf64fc0befbcd09d7a9a62d8b99972ba3dfdd4a94695f63fd892f47e14e"
+dependencies = [
+ "bit_field",
+ "cfg-if",
+ "critical-section",
+ "riscv 0.15.0",
+]
+
 [[package]]
 name = "qingke-rt"
 version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b955c60adac70c6d40205b1dbe9f57e1151d06aa842069cdbaef7bc07ad283fd"
 dependencies = [
- "qingke",
- "qingke-rt-macros",
+ "qingke 0.5.0",
+ "qingke-rt-macros 0.5.0",
+]
+
+[[package]]
+name = "qingke-rt"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a8ba56c91dd9a044bd519778bcf70644d1d936fee4ea20fdc2d0e3bac8f75fb9"
+dependencies = [
+ "qingke 0.6.1",
+ "qingke-rt-macros 0.6.1",
 ]
 
 [[package]]
@@ -600,6 +684,18 @@ dependencies = [
  "syn 1.0.109",
 ]
 
+[[package]]
+name = "qingke-rt-macros"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "54edcd0e9b8b5c3c83d313c93869325bfcd969d30d9cef1a1015b0970b21be81"
+dependencies = [
+ "proc-macro-error",
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+]
+
 [[package]]
 name = "quote"
 version = "1.0.40"
@@ -634,7 +730,20 @@ dependencies = [
  "critical-section",
  "embedded-hal 1.0.0",
  "paste",
- "riscv-macros",
+ "riscv-macros 0.1.0",
+ "riscv-pac",
+]
+
+[[package]]
+name = "riscv"
+version = "0.15.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b05cfa3f7b30c84536a9025150d44d26b8e1cc20ddf436448d74cd9591eefb25"
+dependencies = [
+ "critical-section",
+ "embedded-hal 1.0.0",
+ "paste",
+ "riscv-macros 0.3.0",
  "riscv-pac",
 ]
 
@@ -649,6 +758,17 @@ dependencies = [
  "syn 2.0.101",
 ]
 
+[[package]]
+name = "riscv-macros"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7d323d13972c1b104aa036bc692cd08b822c8bbf23d79a27c526095856499799"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.101",
+]
+
 [[package]]
 name = "riscv-pac"
 version = "0.2.0"
diff --git a/Cargo.toml b/Cargo.toml
index ce4fc45..2804a16 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 = { git = "https://github.com/ju6ge/ch32-hal", branch = "feature/i2c-slave-api", features = [
     "ch32v203c8t6",
     "memory-x",
     "embassy",
diff --git a/openocd.cfg b/openocd.cfg
index fd3d973..9708747 100644
--- a/openocd.cfg
+++ b/openocd.cfg
@@ -12,6 +12,6 @@ target create $_TARGETNAME.0 wch_riscv -chain-position $_TARGETNAME
 $_TARGETNAME.0 configure -work-area-phys 0x20000000 -work-area-size 10000 -work-area-backup 1
 set _FLASHNAME $_CHIPNAME.flash
 
-flash bank $_FLASHNAME wch_rsicv 0x00000000 0 0 0 $_TARGETNAME.0
+flash bank $_FLASHNAME wch_riscv 0x00000000 0 0 0 $_TARGETNAME.0
 
 init
diff --git a/src/main.rs b/src/main.rs
index 3b2a650..c699b99 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -3,31 +3,51 @@
 #![feature(type_alias_impl_trait)]
 #![feature(impl_trait_in_assoc_type)]
 
-mod i2c_slave;
-
+use ch32_hal::println;
+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::peripherals::USBD;
-use hal::usbd::InterruptHandler;
+use hal::i2c::{Config, I2c, SlaveAddress, SlaveConfig};
 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>;
+   I2C1_ER => ch32_hal::i2c::ErrorInterruptHandler<ch32_hal::peripherals::I2C1>;
 });
 
 #[embassy_executor::main(entry = "qingke_rt::entry")]
 async fn main(_spawner: Spawner) -> ! {
     let p = hal::init(Default::default());
 
-    let mut led = Output::new(p.PB2, Level::Low, Default::default());
+    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,
+        });
 
     loop {
-        Timer::after_millis(1000).await;
-
-        //class.write_packet(b"hello world from embassy main\r\n").await;
-
-        led.toggle();
+        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::ReadCommand => {
+                        // send empty response
+                        let _ = i2c_slave.blocking_write_timeout(&[0x05, 0x01]);
+                    }
+                    ch32_hal::i2c::SlaveCommand::WriteCommand => {
+                        let mut buf: [u8; 3] = [0x0, 0x0, 0x0];
+                        let _ = i2c_slave.blocking_read_timeout(&mut buf);
+                        println!("received byte 0x{buf:x?}");
+                    }
+                }
+            },
+            Err(err) => {
+                println!("{:?}", err)
+            }
+        }
     }
 }