diff --git a/User/application/inc/TCA6416.h b/User/application/inc/TCA6416.h
new file mode 100644
index 0000000..42eaf3f
--- /dev/null
+++ b/User/application/inc/TCA6416.h
@@ -0,0 +1,28 @@
+#ifndef __TCA6416_H
+#define __TCA6416_H
+
+#include "stm32f1xx_hal.h"
+
+/* TCA6416 I2C地址 */
+#define TCA6416_ADDR            0x20    // 基础地址 (A0=A1=A2=GND)
+
+/* 寄存器地址定义 */
+#define TCA6416_INPUT_PORT0     0x00    // 输入端口0
+#define TCA6416_INPUT_PORT1     0x01    // 输入端口1
+#define TCA6416_OUTPUT_PORT0    0x02    // 输出端口0
+#define TCA6416_OUTPUT_PORT1    0x03    // 输出端口1
+#define TCA6416_CONFIG_PORT0    0x06    // 配置端口0
+#define TCA6416_CONFIG_PORT1    0x07    // 配置端口1
+#define TCA6416_POL_INV_PORT0   0x04    // 极性反转端口0
+#define TCA6416_POL_INV_PORT1   0x05    // 极性反转端口1
+
+/* 函数声明 */
+HAL_StatusTypeDef TCA6416_Init(I2C_HandleTypeDef *hi2c);
+HAL_StatusTypeDef TCA6416_WritePort(I2C_HandleTypeDef *hi2c, uint8_t port, uint8_t data);
+HAL_StatusTypeDef TCA6416_ReadPort(I2C_HandleTypeDef *hi2c, uint8_t port, uint8_t *data);
+HAL_StatusTypeDef TCA6416_SetPortDirection(I2C_HandleTypeDef *hi2c, uint8_t port, uint8_t direction);
+HAL_StatusTypeDef TCA6416_SetPortPolarity(I2C_HandleTypeDef *hi2c, uint8_t port, uint8_t polarity);
+HAL_StatusTypeDef TCA6416_WritePin(I2C_HandleTypeDef *hi2c, uint8_t port, uint8_t pin, uint8_t state);
+HAL_StatusTypeDef TCA6416_ReadPin(I2C_HandleTypeDef *hi2c, uint8_t port, uint8_t pin, uint8_t *state);
+
+#endif /* __TCA6416_H */
diff --git a/User/application/src/TCA6416.c b/User/application/src/TCA6416.c
new file mode 100644
index 0000000..dacfa3a
--- /dev/null
+++ b/User/application/src/TCA6416.c
@@ -0,0 +1,133 @@
+#include "TCA6416.h"
+
+/**
+ * @brief  初始化TCA6416
+ * @param  hi2c: I2C句柄指针
+ * @retval HAL状态
+ */
+HAL_StatusTypeDef TCA6416_Init(I2C_HandleTypeDef *hi2c)
+{
+    HAL_StatusTypeDef status;
+    
+    // 默认将所有引脚设置为输入
+    status = TCA6416_SetPortDirection(hi2c, 0, 0xFF);
+    if (status != HAL_OK) return status;
+    
+    status = TCA6416_SetPortDirection(hi2c, 1, 0xFF);
+    if (status != HAL_OK) return status;
+    
+    // 设置默认输出值为0
+    status = TCA6416_WritePort(hi2c, 0, 0x00);
+    if (status != HAL_OK) return status;
+    
+    status = TCA6416_WritePort(hi2c, 1, 0x00);
+    if (status != HAL_OK) return status;
+    
+    // 设置默认极性（非反转）
+    status = TCA6416_SetPortPolarity(hi2c, 0, 0x00);
+    if (status != HAL_OK) return status;
+    
+    status = TCA6416_SetPortPolarity(hi2c, 1, 0x00);
+    
+    return status;
+}
+
+/**
+ * @brief  向端口写入数据
+ * @param  hi2c: I2C句柄指针
+ * @param  port: 端口号（0或1）
+ * @param  data: 要写入的数据
+ * @retval HAL状态
+ */
+HAL_StatusTypeDef TCA6416_WritePort(I2C_HandleTypeDef *hi2c, uint8_t port, uint8_t data)
+{
+    uint8_t reg_addr = (port == 0) ? TCA6416_OUTPUT_PORT0 : TCA6416_OUTPUT_PORT1;
+    return HAL_I2C_Mem_Write(hi2c, TCA6416_ADDR << 1, reg_addr, I2C_MEMADD_SIZE_8BIT, &data, 1, HAL_MAX_DELAY);
+}
+
+/**
+ * @brief  从端口读取数据
+ * @param  hi2c: I2C句柄指针
+ * @param  port: 端口号（0或1）
+ * @param  data: 存储读取数据的指针
+ * @retval HAL状态
+ */
+HAL_StatusTypeDef TCA6416_ReadPort(I2C_HandleTypeDef *hi2c, uint8_t port, uint8_t *data)
+{
+    uint8_t reg_addr = (port == 0) ? TCA6416_INPUT_PORT0 : TCA6416_INPUT_PORT1;
+    return HAL_I2C_Mem_Read(hi2c, TCA6416_ADDR << 1, reg_addr, I2C_MEMADD_SIZE_8BIT, data, 1, HAL_MAX_DELAY);
+}
+
+/**
+ * @brief  设置端口方向（输入/输出）
+ * @param  hi2c: I2C句柄指针
+ * @param  port: 端口号（0或1）
+ * @param  direction: 0 = 输出, 1 = 输入
+ * @retval HAL状态
+ */
+HAL_StatusTypeDef TCA6416_SetPortDirection(I2C_HandleTypeDef *hi2c, uint8_t port, uint8_t direction)
+{
+    uint8_t reg_addr = (port == 0) ? TCA6416_CONFIG_PORT0 : TCA6416_CONFIG_PORT1;
+    return HAL_I2C_Mem_Write(hi2c, TCA6416_ADDR << 1, reg_addr, I2C_MEMADD_SIZE_8BIT, &direction, 1, HAL_MAX_DELAY);
+}
+
+/**
+ * @brief  设置端口极性
+ * @param  hi2c: I2C句柄指针
+ * @param  port: 端口号（0或1）
+ * @param  polarity: 0 = 非反转, 1 = 反转
+ * @retval HAL状态
+ */
+HAL_StatusTypeDef TCA6416_SetPortPolarity(I2C_HandleTypeDef *hi2c, uint8_t port, uint8_t polarity)
+{
+    uint8_t reg_addr = (port == 0) ? TCA6416_POL_INV_PORT0 : TCA6416_POL_INV_PORT1;
+    return HAL_I2C_Mem_Write(hi2c, TCA6416_ADDR << 1, reg_addr, I2C_MEMADD_SIZE_8BIT, &polarity, 1, HAL_MAX_DELAY);
+}
+
+/**
+ * @brief  写入单个引脚
+ * @param  hi2c: I2C句柄指针
+ * @param  port: 端口号（0或1）
+ * @param  pin: 引脚号（0-7）
+ * @param  state: 引脚状态（0或1）
+ * @retval HAL状态
+ */
+HAL_StatusTypeDef TCA6416_WritePin(I2C_HandleTypeDef *hi2c, uint8_t port, uint8_t pin, uint8_t state)
+{
+    HAL_StatusTypeDef status;
+    uint8_t current_data;
+    uint8_t reg_addr = (port == 0) ? TCA6416_OUTPUT_PORT0 : TCA6416_OUTPUT_PORT1;
+    
+    // 读取当前端口值
+    status = HAL_I2C_Mem_Read(hi2c, TCA6416_ADDR << 1, reg_addr, I2C_MEMADD_SIZE_8BIT, &current_data, 1, HAL_MAX_DELAY);
+    if (status != HAL_OK) return status;
+    
+    // 修改特定引脚
+    if (state)
+        current_data |= (1 << pin);
+    else
+        current_data &= ~(1 << pin);
+    
+    // 写回修改后的值
+    return HAL_I2C_Mem_Write(hi2c, TCA6416_ADDR << 1, reg_addr, I2C_MEMADD_SIZE_8BIT, &current_data, 1, HAL_MAX_DELAY);
+}
+
+/**
+ * @brief  读取单个引脚
+ * @param  hi2c: I2C句柄指针
+ * @param  port: 端口号（0或1）
+ * @param  pin: 引脚号（0-7）
+ * @param  state: 存储引脚状态的指针
+ * @retval HAL状态
+ */
+HAL_StatusTypeDef TCA6416_ReadPin(I2C_HandleTypeDef *hi2c, uint8_t port, uint8_t pin, uint8_t *state)
+{
+    HAL_StatusTypeDef status;
+    uint8_t port_data;
+    
+    status = TCA6416_ReadPort(hi2c, port, &port_data);
+    if (status != HAL_OK) return status;
+    
+    *state = (port_data >> pin) & 0x01;
+    return HAL_OK;
+}