STM32-Player-Doc/STM32H743VI 开发版/STM32H750驱动例程(HAL库)/例32 USB虚拟串口(Slave)/HARDWARE/IIC/myiic.c

#include "myiic.h"
#include "delay.h"
//////////////////////////////////////////////////////////////////////////////////	 
//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֻ<EFBFBD><D6BB>ѧϰʹ<CFB0>ã<EFBFBD>δ<EFBFBD><CEB4><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ɣ<EFBFBD><C9A3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>κ<EFBFBD><CEBA><EFBFBD>;
//ALIENTEK STM32F7<46><37><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
//IIC<49><43><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>	   
//<2F><><EFBFBD><EFBFBD>ԭ<EFBFBD><D4AD>@ALIENTEK
//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>̳:www.openedv.com
//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>:2015/12/28
//<2F>汾<EFBFBD><E6B1BE>V1.0
//<2F><>Ȩ<EFBFBD><C8A8><EFBFBD>У<EFBFBD><D0A3><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ؾ<EFBFBD><D8BE><EFBFBD>
//Copyright(C) <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ӿƼ<D3BF><C6BC><EFBFBD><EFBFBD>޹<EFBFBD>˾ 2014-2024
//All rights reserved									  
////////////////////////////////////////////////////////////////////////////////// 	

//IIC<49><43>ʼ<EFBFBD><CABC>
void IIC_Init(void)
{
    GPIO_InitTypeDef GPIO_Initure;
    
    __HAL_RCC_GPIOH_CLK_ENABLE();   //ʹ<><CAB9>GPIOHʱ<48><CAB1>
    
    //PH4,5<><35>ʼ<EFBFBD><CABC><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    GPIO_Initure.Pin=GPIO_PIN_4|GPIO_PIN_5;
    GPIO_Initure.Mode=GPIO_MODE_OUTPUT_PP;  //<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    GPIO_Initure.Pull=GPIO_PULLUP;          //<2F><><EFBFBD><EFBFBD>
    GPIO_Initure.Speed=GPIO_SPEED_FREQ_VERY_HIGH;    //<2F><><EFBFBD><EFBFBD>
    HAL_GPIO_Init(GPIOH,&GPIO_Initure);
    
    IIC_SDA(1);
    IIC_SCL(1);  
}

//<2F><><EFBFBD><EFBFBD>IIC<49><43>ʼ<EFBFBD>ź<EFBFBD>
void IIC_Start(void)
{
	SDA_OUT();     //sda<64><61><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	IIC_SDA(1);	  	  
	IIC_SCL(1);
	delay_us(4);
 	IIC_SDA(0);//START:when CLK is high,DATA change form high to low 
	delay_us(4);
	IIC_SCL(0);//ǯסI2C<32><43><EFBFBD>ߣ<EFBFBD>׼<EFBFBD><D7BC><EFBFBD><EFBFBD><EFBFBD>ͻ<EFBFBD><CDBB><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 
}	  
//<2F><><EFBFBD><EFBFBD>IICֹͣ<CDA3>ź<EFBFBD>
void IIC_Stop(void)
{
	SDA_OUT();//sda<64><61><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	IIC_SCL(0);
	IIC_SDA(0);//STOP:when CLK is high DATA change form low to high
 	delay_us(4);
	IIC_SCL(1); 
	IIC_SDA(1);//<2F><><EFBFBD><EFBFBD>I2C<32><43><EFBFBD>߽<EFBFBD><DFBD><EFBFBD><EFBFBD>ź<EFBFBD>
	delay_us(4);							   	
}
//<2F>ȴ<EFBFBD>Ӧ<EFBFBD><D3A6><EFBFBD>źŵ<C5BA><C5B5><EFBFBD>
//<2F><><EFBFBD><EFBFBD>ֵ<EFBFBD><D6B5>1<EFBFBD><31><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӧ<EFBFBD><D3A6>ʧ<EFBFBD><CAA7>
//        0<><30><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӧ<EFBFBD><D3A6><EFBFBD>ɹ<EFBFBD>
u8 IIC_Wait_Ack(void)
{
	u8 ucErrTime=0;
	SDA_IN();      //SDA<44><41><EFBFBD><EFBFBD>Ϊ<EFBFBD><CEAA><EFBFBD><EFBFBD>  
	IIC_SDA(1);delay_us(1);	   
	IIC_SCL(1);delay_us(1);	 
	while(READ_SDA)
	{
		ucErrTime++;
		if(ucErrTime>250)
		{
			IIC_Stop();
			return 1;
		}
	}
	IIC_SCL(0);//ʱ<><CAB1><EFBFBD><EFBFBD><EFBFBD><EFBFBD>0 	   
	return 0;  
} 
//<2F><><EFBFBD><EFBFBD>ACKӦ<4B><D3A6>
void IIC_Ack(void)
{
	IIC_SCL(0);
	SDA_OUT();
	IIC_SDA(0);
	delay_us(2);
	IIC_SCL(1);
	delay_us(2);
	IIC_SCL(0);
}
//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ACKӦ<4B><D3A6>		    
void IIC_NAck(void)
{
	IIC_SCL(0);
	SDA_OUT();
	IIC_SDA(1);
	delay_us(2);
	IIC_SCL(1);
	delay_us(2);
	IIC_SCL(0);
}					 				     
//IIC<49><43><EFBFBD><EFBFBD>һ<EFBFBD><D2BB><EFBFBD>ֽ<EFBFBD>
//<2F><><EFBFBD>شӻ<D8B4><D3BB><EFBFBD><EFBFBD><EFBFBD>Ӧ<EFBFBD><D3A6>
//1<><31><EFBFBD><EFBFBD>Ӧ<EFBFBD><D3A6>
//0<><30><EFBFBD><EFBFBD>Ӧ<EFBFBD><D3A6>			  
void IIC_Send_Byte(u8 txd)
{                        
    u8 t;   
	SDA_OUT(); 	    
    IIC_SCL(0);//<2F><><EFBFBD><EFBFBD>ʱ<EFBFBD>ӿ<EFBFBD>ʼ<EFBFBD><CABC><EFBFBD>ݴ<EFBFBD><DDB4><EFBFBD>
    for(t=0;t<8;t++)
    {              
        IIC_SDA((txd&0x80)>>7);
        txd<<=1; 	  
		delay_us(2);   //<2F><>TEA5767<36><37><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><CAB1><EFBFBD>DZ<EFBFBD><C7B1><EFBFBD><EFBFBD><EFBFBD>
		IIC_SCL(1);
		delay_us(2); 
		IIC_SCL(0);	
		delay_us(2);
    }	 
} 	    
//<2F><>1<EFBFBD><31><EFBFBD>ֽڣ<D6BD>ack=1ʱ<31><CAB1><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ACK<43><4B>ack=0<><30><EFBFBD><EFBFBD><EFBFBD><EFBFBD>nACK   
u8 IIC_Read_Byte(unsigned char ack)
{
	unsigned char i,receive=0;
	SDA_IN();//SDA<44><41><EFBFBD><EFBFBD>Ϊ<EFBFBD><CEAA><EFBFBD><EFBFBD>
    for(i=0;i<8;i++ )
	{
        IIC_SCL(0); 
        delay_us(2);
		IIC_SCL(1);
        receive<<=1;
        if(READ_SDA)receive++;   
		delay_us(1); 
    }					 
    if (!ack)
        IIC_NAck();//<2F><><EFBFBD><EFBFBD>nACK
    else
        IIC_Ack(); //<2F><><EFBFBD><EFBFBD>ACK   
    return receive;
}