PCA9555代码解析（包含代码链接）

野性酷女 2023-01-16 09:57 822阅读 0赞

**PCA9555：IIC转16路输入/输出芯片**  
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//初始化
    void I2C_GPIOInitConfig(void)
    { 
    	GPIO_InitTypeDef GPIO_InitStruct;
    	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE); //打开时钟
    	
    	GPIO_InitStruct.GPIO_Pin = GPIO_Pin_10 |GPIO_Pin_11;
    	GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
    	GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;
    	GPIO_Init(GPIOB, &GPIO_InitStruct);//GPIO口初始化
    	
    	GPIO_SetBits(GPIOB,GPIO_Pin_10|GPIO_Pin_11); 	//输出高
    }
    void PCA9555_Init(void)
    { 
    	u8 ucAck;
    
    	if(PCA9555_CheckOk() == 0)	//PCA9555_CheckOk
    	{ 
    		/* 没有检测到EEPROM */
    		SEGGER_RTT_printf(0,"Not check PCA9555!\r\n");
    // while (1); /* 停机 */
    	}
    	else
    	{ 
    		SEGGER_RTT_printf(0,"check PCA9555!\r\n");
    	}
    
    	//数据bit填0表示输出，1表示输入
    	PCA9555_IO_Write_2(Address_U28,DIR,0xff,0xff);	//配置端口0 需要加上
    
    	PCA9555_IO_Write_2(Address_U29,DIR,0xff,0xff);	//配置端口0 需要加上
    
    	PCA9555_IO_Write_2(Address_U45,DIR,0xff,0xff);	//配置端口0 需要加上
    }
    
    void PCA9555_Scan(void)
    { 
    	PCA555_Write_IO_IN(Address_U28,&PCA9555_U28_IN_data[0]);	//输入IO
    
    	SEGGER_RTT_printf(0,"PCA9555_U28_IN_data[0] = %x\n",PCA9555_U28_IN_data[0]);//调试通用
    	SEGGER_RTT_printf(0,"PCA9555_U28_IN_data[1] = %x\n",PCA9555_U28_IN_data[1]);//调试通用
    
    	PCA555_Write_IO_IN(Address_U29,&PCA9555_U29_IN_data[0]);	//输入IO
    
    	SEGGER_RTT_printf(0,"PCA9555_U29_IN_data[0] = %x\n",PCA9555_U29_IN_data[0]);//调试通用
    	SEGGER_RTT_printf(0,"PCA9555_U29_IN_data[1] = %x\n",PCA9555_U29_IN_data[1]);//调试通用
    
    	PCA555_Write_IO_IN(Address_U45,&PCA9555_U45_IN_data[0]);	//输入IO
    
    	SEGGER_RTT_printf(0,"PCA9555_U45_IN_data[0] = %x\n",PCA9555_U45_IN_data[0]);//调试通用
    	SEGGER_RTT_printf(0,"PCA9555_U45_IN_data[1] = %x\n",PCA9555_U45_IN_data[1]);//调试通用
    
    // PCA555_Write_IO_OUT(Address_U45,0x8f,0xff); //输出IO
    }

代码和资料链接：https://download.csdn.net/download/weixin\_37787043/17828027

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