diff --git a/inc/i2c.h b/inc/i2c.h
index 98f8193..817064b 100644
--- a/inc/i2c.h
+++ b/inc/i2c.h
@@ -69,7 +69,9 @@ void i2c_send_nack(void);
 
 uint8_t i2c_wait_ack(void);
 
+void i2c_send_byte(uint8_t byte);
 
+uint8_t i2c_receive_byte(uint8_t ack);
 
 void i2c_config(void);
 
diff --git a/sdk/CMSIS/src/system_gd32e23x.c b/sdk/CMSIS/src/system_gd32e23x.c
index 6a048f0..d8ab26e 100644
--- a/sdk/CMSIS/src/system_gd32e23x.c
+++ b/sdk/CMSIS/src/system_gd32e23x.c
@@ -45,9 +45,9 @@
 
 /* select a system clock by uncommenting the following line */
 //#define __SYSTEM_CLOCK_8M_HXTAL              (__HXTAL)
-#define __SYSTEM_CLOCK_8M_IRC8M              (__IRC8M)
+// #define __SYSTEM_CLOCK_8M_IRC8M              (__IRC8M)
 // #define __SYSTEM_CLOCK_72M_PLL_HXTAL         (uint32_t)(72000000)
-// #define __SYSTEM_CLOCK_72M_PLL_IRC8M_DIV2    (uint32_t)(72000000)
+#define __SYSTEM_CLOCK_72M_PLL_IRC8M_DIV2    (uint32_t)(72000000)
 
 #define RCU_MODIFY(__delay)     do{                                     \
                                     volatile uint32_t i;                \
diff --git a/src/i2c.c b/src/i2c.c
index bd104e9..667efab 100644
--- a/src/i2c.c
+++ b/src/i2c.c
@@ -26,7 +26,7 @@ void i2c_gpio_config(void) {
 }
 
 void i2c_delay(void) {
-    delay_us(5); // Adjust delay as needed
+    delay_us(40); // Adjust delay as needed
 }
 
 /*!
@@ -48,27 +48,41 @@ void si2c_config(void) {
     I2C_SDA_HIGH();
 }
 
+// void sda_out(void) {
+//     gpio_mode_set(I2C_SDA_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_PULLUP, I2C_SDA_PIN);
+//     gpio_output_options_set(I2C_SDA_PORT, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, I2C_SDA_PIN);
+// }
+//
+// void sda_in(void) {
+//     gpio_mode_set(I2C_SDA_PORT, GPIO_MODE_INPUT, GPIO_PUPD_PULLUP, I2C_SDA_PIN);
+// }
+
 void i2c_start(void) {
+    // sda_out();
     I2C_SDA_HIGH();
     I2C_SCL_HIGH();
     i2c_delay();
     I2C_SDA_LOW();
     i2c_delay();
     I2C_SCL_LOW();
+    i2c_delay();
+    i2c_delay();
     // 从全高开始，SCL为高期间，SDA下降沿表示start信号，再拉低SCL
 }
 
 void i2c_stop(void) {
+    // sda_out();
     I2C_SCL_LOW();
     I2C_SDA_LOW();
     i2c_delay();
     I2C_SCL_HIGH();
     i2c_delay();
     I2C_SDA_HIGH();
-    // 从全低开始，SCL为高期间，SDA上升沿表示stop信号，再拉高SCL
+    // 从全低开始，SCL为高期间，SDA上升沿表示stop
 }
 
 void i2c_send_ack(void) {
+    // sda_out();
     I2C_SDA_LOW();
     i2c_delay();
     I2C_SCL_HIGH();
@@ -80,6 +94,7 @@ void i2c_send_ack(void) {
 }
 
 void i2c_send_nack(void) {
+    // sda_out();
     I2C_SDA_HIGH();
     i2c_delay();
     I2C_SCL_HIGH();
@@ -91,6 +106,7 @@ void i2c_send_nack(void) {
 }
 
 uint8_t i2c_wait_ack(void) {
+    // sda_in();
     I2C_SDA_HIGH();
     i2c_delay();
     I2C_SCL_HIGH();
@@ -102,6 +118,7 @@ uint8_t i2c_wait_ack(void) {
 }
 
 void i2c_send_byte(uint8_t byte) {
+    // sda_out();
     for (int i = 0; i < 8; i++) {
         if (byte & 0x80) { //通过&操作获取第一位是1还是0
             I2C_SDA_HIGH(); //SCL低电平期间，SDA高电平表示1
@@ -113,11 +130,13 @@ void i2c_send_byte(uint8_t byte) {
         I2C_SCL_HIGH(); //SCL拉高电平，SDA电平状态保持不变
         i2c_delay();
         I2C_SCL_LOW(); //SCL拉低电平
+        delay_us(5);
     }
-    i2c_wait_ack();
+    // i2c_wait_ack();
 }
 
 uint8_t i2c_receive_byte(uint8_t ack) {
+    // sda_in();
     uint8_t byte = 0;
     I2C_SDA_HIGH(); //从高开始
     for (int i = 0; i < 8; i++) {
diff --git a/src/led.c b/src/led.c
index 2c0d34a..f203941 100644
--- a/src/led.c
+++ b/src/led.c
@@ -16,10 +16,10 @@ void led_config(void) {
 
     timer_parameter_struct timer_initpara;
     timer_struct_para_init(&timer_initpara);
-    timer_initpara.prescaler = 799;
+    timer_initpara.prescaler = 7199;
     timer_initpara.alignedmode = TIMER_COUNTER_EDGE;
     timer_initpara.counterdirection = TIMER_COUNTER_UP;
-    timer_initpara.period = 999;
+    timer_initpara.period = 9999;
     timer_initpara.clockdivision = TIMER_CKDIV_DIV1;
     timer_init(LED_TIMER, &timer_initpara);
 
diff --git a/src/main.c b/src/main.c
index 7973522..b539acb 100644
--- a/src/main.c
+++ b/src/main.c
@@ -55,18 +55,79 @@ int main(void) {
     rs485_config();
     /* configure LED */
     led_config();
+
+    // watchdog_init();
     /* configure I2C */
     // i2c_gpio_config();
     // i2c_config();
 
     // ldc1612_iic_get_sensor_infomation();
     /* configure LDC1612 */
-    ldc1612_single_ch0_config();
+    // ldc1612_single_ch0_config();
+
+    uint8_t data[2] = {0};
+
+    printf("Start\n");
+
+
 
     /* Initialize watchdog */
     watchdog_init();
 
     while (1) {
+        si2c_config();
+        printf("111\n");
+
+        i2c_start();
+        i2c_send_byte((0x2B << 1) + 1);
+        if (!i2c_wait_ack())
+        {
+            printf("NACK\n");
+        }
+
+        i2c_delay();
+
+        i2c_send_byte(0x7E);
+        // if (!i2c_wait_ack())
+        // {
+        //     printf("NACK\n");
+        // }
+
+        i2c_delay();
+        i2c_start();
+
+        i2c_send_byte((0x2B << 1));
+        if (!i2c_wait_ack())
+        {
+            printf("NACK\n");
+        }
+
+        i2c_delay();
+
+        data[0] = i2c_receive_byte(1);
+        i2c_delay();
+        data[1] = i2c_receive_byte(0);
+
+        delay_us(5);
+        i2c_stop();
+        // printf("OK\n");
+
+        printf("0x%x 0x%x\n", data[0], data[1]);
+
+
+
+
+
+        // i2c_start();
+        // delay_ms(1);
+        // i2c_stop();
+        // delay_ms(1);
+        delay_ms(1000);
+        // g_eddy_current_value_uint32 = 0;
+        // g_temperature_uint32 = 0;
+        // g_eddy_current_value_uint32 = ldc1612_get_raw_channel_result(CHANNEL_0);
+        // g_temperature_uint32 = tmp112a_get_raw_channel_result();
+        printf("1\n");
         delay_ms(99);
         fwdgt_counter_reload();
     }