diff --git a/Libraries/SoftI2C_HAL_Lib b/Libraries/SoftI2C_HAL_Lib
index 0a6b8ee..3f66272 160000
--- a/Libraries/SoftI2C_HAL_Lib
+++ b/Libraries/SoftI2C_HAL_Lib
@@ -1 +1 @@
-Subproject commit 0a6b8ee6aa4d3b5c4952458c3c7cc905acbf5f64
+Subproject commit 3f6627255410641aa26a077891e2e87c20cbde37
diff --git a/Project/SlaveNode.uvprojx b/Project/SlaveNode.uvprojx
index 2acea46..74d0666 100644
--- a/Project/SlaveNode.uvprojx
+++ b/Project/SlaveNode.uvprojx
@@ -339,7 +339,7 @@
               <MiscControls></MiscControls>
               <Define>USE_HAL_DRIVER, STM32F103x6</Define>
               <Undefine></Undefine>
-              <IncludePath>..\Core;..\Libraries\HAL_Lib\Inc;..\Libraries\SoftSPI_HAL_Lib;..\User\Main;..\System\sys;..\System\systick;..\System\uart;..\Hardware\led</IncludePath>
+              <IncludePath>..\Core;..\Libraries\HAL_Lib\Inc;..\Libraries\SoftSPI_HAL_Lib;..\Libraries\SoftI2C_HAL_Lib;..\User\Main;..\System\sys;..\System\systick;..\System\uart;..\Hardware\led</IncludePath>
             </VariousControls>
           </Cads>
           <Aads>
@@ -650,6 +650,21 @@
             </File>
           </Files>
         </Group>
+        <Group>
+          <GroupName>SoftI2C_HAL_Lib</GroupName>
+          <Files>
+            <File>
+              <FileName>softi2c_conf.h</FileName>
+              <FileType>5</FileType>
+              <FilePath>..\Libraries\SoftI2C_HAL_Lib\softi2c_conf.h</FilePath>
+            </File>
+            <File>
+              <FileName>softi2c.c</FileName>
+              <FileType>1</FileType>
+              <FilePath>..\Libraries\SoftI2C_HAL_Lib\softi2c.c</FilePath>
+            </File>
+          </Files>
+        </Group>
         <Group>
           <GroupName>System</GroupName>
           <Files>
diff --git a/User/Main/main.c b/User/Main/main.c
index 0de1ef1..92adde0 100644
--- a/User/Main/main.c
+++ b/User/Main/main.c
@@ -1,20 +1,21 @@
 /**
  * @file    main.c
  * @author  Myth
- * @version 0.2
+ * @version 0.3
  * @date    2021.10.12
  * @brief   工程主函数文件
  * @details 初始化及主循环
  * @note    此版本实现功能：
  *          串口回显，回显时 PC13 上的 LED 闪烁
- *          软件 SPI
+ *          软件 I2C
+ *          JTAG 已禁用，请使用 SWD 调试
  */
 
 #include "sys.h"
 #include "systick.h"
 #include "uart.h"
 
-#include "softspi.h"
+#include "softi2c.h"
 
 #include "led.h"
 
@@ -27,6 +28,7 @@ int main(void)
         Error_Handler(__FILE__, __LINE__); //错误处理
     }
     SystemClock_Config(); //初始化系统时钟为 72MHz
+    DisableJTAG();        //禁用 JTAG
     SysTick_Init();       //初始化 SysTick 和软件定时器
     UART_Init();          //初始化串口
 
@@ -34,30 +36,39 @@ int main(void)
 
     UART_BindReceiveHandle(COM1, Echo); //绑定 COM1 串口接收中断至 Echo 函数
 
-    SoftSPI_TypeDef SoftSPI;
+    SoftI2C_TypeDef SoftI2C;
 
-    SoftSPI.SCLK_GPIO = GPIOB;
-    SoftSPI.SCLK_Pin = GPIO_PIN_10;
-    SoftSPI.MOSI_GPIO = GPIOA;
-    SoftSPI.MOSI_Pin = GPIO_PIN_5;
-    SoftSPI.MISO_GPIO = GPIOA;
-    SoftSPI.MISO_Pin = GPIO_PIN_4;
-    SoftSPI.SS_GPIO = GPIOA;
-    SoftSPI.SS_Pin = GPIO_PIN_6;
-    SoftSPI.Delay_Time = 10;
+    SoftI2C.SDA_GPIO = GPIOB;
+    SoftI2C.SDA_Pin = GPIO_PIN_3;
+    SoftI2C.SCL_GPIO = GPIOB;
+    SoftI2C.SCL_Pin = GPIO_PIN_4;
+    SoftI2C.Delay_Time = 10;
 
-    if (SoftSPI_Init(&SoftSPI) != HAL_OK) //初始化软件 SPI
+    if (SoftI2C_Init(&SoftI2C) != HAL_OK) //初始化软件 I2C
     {
         Error_Handler(__FILE__, __LINE__); //错误处理
     }
 
-    uint8_t write[10] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
-    uint8_t read[10];
     while (1)
     {
         //程序主循环
-        SoftSPI_WriteReadBuff(&SoftSPI, write, read, 10);
-        Delay_us(100);
+        SoftI2C_Start(&SoftI2C);
+
+        SoftI2C_WriteByte(&SoftI2C, 0x10);
+        SoftI2C_WaitAck(&SoftI2C);
+
+        SoftI2C_WriteByte(&SoftI2C, 0x22);
+        SoftI2C_WaitAck(&SoftI2C);
+
+        SoftI2C_WriteByte(&SoftI2C, 0x33);
+        SoftI2C_WaitAck(&SoftI2C);
+
+        SoftI2C_WriteByte(&SoftI2C, 0x44);
+        SoftI2C_WaitAck(&SoftI2C);
+
+        SoftI2C_Stop(&SoftI2C);
+
+        Delay_us(1000);
     }
 
     return 1;