一、引脚介绍
1.引脚图
2.引脚描述
二、功能介绍
1.当作输入口，读取I/O口的电平
2.当作输出口，输出高低电平
3.中断功能，检测电平的变化
三、XJ9554的驱动
XJ9554.C
/** AT9554.c** Created on: 2024年8月19日* Author: Administrator*/
#include "softiic.h"
#include "AT9554.h"
#include "usart.h"
#include <stdio.h>//XJ9554的IIC读
uint8_t XJ9554ReadOneByte(uint8_t ReadAddr)
{uint8_t temp=0;bsp_analog_i2c_start();bsp_analog_i2c_send_byte(0X40);bsp_analog_i2c_wait_ack();bsp_analog_i2c_send_byte(ReadAddr);bsp_analog_i2c_wait_ack();bsp_analog_i2c_start();bsp_analog_i2c_send_byte(0X41);bsp_analog_i2c_wait_ack();temp= bsp_analog_i2c_read_byte();bsp_analog_i2c_nack();bsp_analog_i2c_stop();return temp;
}//XJ9554的IIC写
void XJ9554WriteOneByte(uint8_t WriteAddr,uint8_t DataToWrite)
{bsp_analog_i2c_start();bsp_analog_i2c_send_byte(0x40);bsp_analog_i2c_wait_ack();bsp_analog_i2c_send_byte(WriteAddr);bsp_analog_i2c_wait_ack();bsp_analog_i2c_send_byte(DataToWrite);bsp_analog_i2c_wait_ack();bsp_analog_i2c_stop();
}/***
功能：设置I/O口输出高或者输出低
输入：pin 引脚state SET为高,RESET为低
返回：无
*****/
void XJ9554_set_pin(uint8_t pin, uint8_t state)
{unsigned char data0 = XJ9554ReadOneByte(OUTPUT_PORT_REG);unsigned char data1 = XJ9554ReadOneByte(CONFIGURATION_REG);if (state){data0 |= 1 << pin;}else{data0 &= ~(1 << pin);}data1 &= ~(1 << pin);XJ9554WriteOneByte(OUTPUT_PORT_REG, data0);XJ9554WriteOneByte(CONFIGURATION_REG, data1 );
}/***
功能：获取I/O口的输入电平
输入：pin 引脚
返回：1 I/O口的电平为高0 I/O口的电平为低
*****/
uint8_t XJ9554_get_pin(uint8_t pin)
{unsigned char data0 = XJ9554ReadOneByte(INPUT_PORT_REG);unsigned char data1 = XJ9554ReadOneByte(CONFIGURATION_REG);data1 &= ~(1 << pin);XJ9554WriteOneByte(CONFIGURATION_REG, data1 );return (data0 & (1 << pin)) != 0;
}/***
功能：改变I/O口的输入极性
输入：pin 引脚Value RESET正极性 SET正极性
返回：
*****/
void XJ9554_Polarity(uint8_t pin, uint8_t Value)
{unsigned char data = XJ9554ReadOneByte(POLARITY_INVERSION_REG);if (Value){data |= 1 << pin;}else{data &= ~(1 << pin);}XJ9554WriteOneByte(POLARITY_INVERSION_REG, data );
}
XJ9554.H
/** AT9554.h** Created on: 2024年8月19日* Author: Administrator*/#ifndef INC_AT9554_H_
#define INC_AT9554_H_#define INPUT_PORT_REG 0x00
#define OUTPUT_PORT_REG 0x01
#define POLARITY_INVERSION_REG 0x02
#define CONFIGURATION_REG 0x03#define RESET 0
#define SET 1uint8_t XJ9554ReadOneByte(uint8_t ReadAddr);
void XJ9554WriteOneByte(uint8_t WriteAddr,uint8_t DataToWrite);void XJ9554_set_pin(uint8_t pin, uint8_t state);
uint8_t XJ9554_get_pin(uint8_t pin);
void XJ9554_Polarity(uint8_t pin, uint8_t Value);#endif /* INC_AT9554_H_ */
