diff --git a/src/main.rs b/src/main.rs
index c52e6d1..32e9f8a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -20,31 +20,70 @@ fn i2c_init() -> (I2c, I2c) {
     let i2c_minus = I2c::new(i2c_config_minus).unwrap();
     (i2c_plus, i2c_minus)
 }
+fn switch_led_setup() -> ( gpio::GpioPort, gpio::GpioPort, gpio::GpioPort, 
+    gpio::GpioPort, gpio::GpioPort, gpio::GpioPort, gpio::GpioPort){
+    let red: gpio::GpioPort = gpio::PB7;
+    let green: gpio::GpioPort = gpio::PB8;
+    let s1: gpio::GpioPort = gpio::PA9;
+    let s2: gpio::GpioPort = gpio::PA10;
+    let s3: gpio::GpioPort = gpio::PB4;
+    let s4: gpio::GpioPort = gpio::PB5;
+    let s5: gpio::GpioPort = gpio::PA5;
+    
+    green.setup();
+    red.setup();
+    s1.setup();
+    s2.setup();
+    s3.setup();
+    s4.setup();
+    s5.setup();
+    (green, red, s1, s2, s3,s4,s5)
+}
+
+fn i2c_send( i2c:&mut I2c, addr: u16, mut data: [u8; 2]) {
+    let i2c_message = i2c::I2cMessage {
+        addr,
+        data:&mut data,
+    };
+    i2c.send(&i2c_message).unwrap();
+}
+
+const POS_DAC_1_ADDR: u16  = 0x20;
+
+const DAC_REG_BASE: u8 = 0xF8;
+const DAC_REG_1: u8 = 0xF8;
+const DAC_REG_2: u8 = 0xF9;
+const DAC_REG_3: u8 = 0xFA;
+const DAC_REG_4: u8 = 0xFB;
 
 #[task]
 async fn async_main(spawner: Spawner) {
     // be careful, if the dbg is not enabled, but using deep sleep. This framework will not able to connect to chip.
     // stm32cube programmer, stmcubeide can be used to program the chip, then this framework can be used to debug.
-    clock::init_clock(false, true, 16_000_000, true, clock::ClockFreqs::KernelFreq4Mhz);
+    clock::init_clock(false, true, 16_000_000, true, clock::ClockFreqs::KernelFreq160Mhz);
     no_deep_sleep_request();
     defmt::info!("setup led finished!");
-    let red: gpio::GpioPort = gpio::PB7;
-    let green: gpio::GpioPort = gpio::PB8;
-    green.setup();
-    red.setup();
+    let (green, red, s1, s2, s3, s4, s5) = switch_led_setup();
+    s1.set_low();
+    s2.set_high();
+    s3.set_low();
+    s4.set_high();
+    s5.set_low();
+
     let (mut i2c_plus, mut i2c_minus) = i2c_init();
-    // let i2c_message = i2c::I2cMessage {
-    //     addr: 0x68,
-    //     data: &mut [0x75],
-    // };
-    // i2c_plus.send(&i2c_message).unwrap();
-    defmt::info!("i2c init finished!");
+    for i in 0..4{
+        i2c_send(&mut i2c_plus, POS_DAC_1_ADDR, [DAC_REG_BASE + i, 0x50]);
+    }
+    for i in 0..4 {
+        i2c_send(&mut i2c_minus, POS_DAC_1_ADDR, [DAC_REG_BASE + i, 0x50]);
+    }
+    defmt::info!("i2c finished!");
+
     loop {
-        // exti::EXTI13_PC13.wait_for_raising().await;
         green.toggle();
-        red.toggle();
-        delay_ms(500);
-        defmt::info!("toggle leds");
+        // red.toggle();
+        // delay_ms(1000);
+        // defmt::info!("toggle leds");
     }
 }