MyStm32Code/bsp/Src/bsp_i2c_soft.c

#include "bsp_i2c_soft.h"
#include "elog.h"
// #include "delay.h"
 
void IIC_Init(const IIC_SOFT_TypeDef *pSoftIIC )
{
    GPIO_InitTypeDef GPIO_Initure;
    
    __HAL_RCC_GPIOB_CLK_ENABLE();   		// 使能GPIOB时钟

    //PB6  SCL PB7初始化设置
    GPIO_Initure.Pin	= pSoftIIC->scl_pin ;
    GPIO_Initure.Mode	= GPIO_MODE_OUTPUT_PP;  // 推挽输出
    GPIO_Initure.Pull	= GPIO_PULLUP;          // 上拉
    GPIO_Initure.Speed	= GPIO_SPEED_FAST;     // 快速
    HAL_GPIO_Init( pSoftIIC->scl_port, &GPIO_Initure );

    //  SDA PB7 初始化设置
    GPIO_Initure.Pin	= pSoftIIC->sda_pin;
    HAL_GPIO_Init( pSoftIIC->sda_port, &GPIO_Initure ); 
    
    GPIO_WRITE_PIN(pSoftIIC->sda_port, pSoftIIC->sda_pin, 1);
    GPIO_WRITE_PIN(pSoftIIC->scl_port, pSoftIIC->scl_pin, 1);  
}


int IIC_READ_SDA_Pin(const IIC_SOFT_TypeDef *pSoftIIC)
{
    return HAL_GPIO_ReadPin(pSoftIIC->sda_port,pSoftIIC->sda_pin);
}

int IIC_SDA_Mode_In(const IIC_SOFT_TypeDef *pSoftIIC)
{
    // 取针脚号 pin6 的值为 2^6
    // GPIO_WRITE_PIN(pSoftIIC->sda_port, pSoftIIC->sda_pin, 1);
    pSoftIIC->sda_port->MODER&=~(3<<(pSoftIIC->sda_pin_num*2));
    pSoftIIC->sda_port->MODER|=0<<pSoftIIC->sda_pin_num*2;
}
int IIC_SDA_Mode_Out(const IIC_SOFT_TypeDef *pSoftIIC)
{
    // GPIO_WRITE_PIN(pSoftIIC->sda_port, pSoftIIC->sda_pin, 1);
    pSoftIIC->sda_port->MODER&=~(3<<(pSoftIIC->sda_pin_num*2));
    pSoftIIC->sda_port->MODER|=1<<pSoftIIC->sda_pin_num*2;
}
//产生IIC起始信号
void IIC_Start(const IIC_SOFT_TypeDef *pSoftIIC)
{
	// SDA_OUT();//sda线输出
    IIC_SDA_Mode_Out( pSoftIIC); //sda线输出   
 
	GPIO_WRITE_PIN(pSoftIIC->sda_port, pSoftIIC->sda_pin, 1);	  	  
	GPIO_WRITE_PIN(pSoftIIC->scl_port, pSoftIIC->scl_pin, 1);
	delay_us(4);
 	GPIO_WRITE_PIN(pSoftIIC->sda_port, pSoftIIC->sda_pin, 0);		//START:when CLK is high,DATA change form high to low 
	delay_us(4);
	GPIO_WRITE_PIN(pSoftIIC->scl_port, pSoftIIC->scl_pin, 0);//钳住I2C总线，准备发送或接收数据 
}	 

//产生IIC停止信号
void IIC_Stop(const IIC_SOFT_TypeDef *pSoftIIC)
{
	// SDA_OUT();//sda线输出
    IIC_SDA_Mode_Out( pSoftIIC); //sda线输出  

	GPIO_WRITE_PIN(pSoftIIC->scl_port, pSoftIIC->scl_pin, 0);
	GPIO_WRITE_PIN(pSoftIIC->sda_port, pSoftIIC->sda_pin, 0);//STOP:when CLK is high DATA change form low to high
 	delay_us(4);
	GPIO_WRITE_PIN(pSoftIIC->scl_port, pSoftIIC->scl_pin, 1); 
	GPIO_WRITE_PIN(pSoftIIC->sda_port, pSoftIIC->sda_pin, 1);//发送I2C总线结束信号
	delay_us(4);							   	
}
//等待应答信号到来
//返回值：1，接收应答失败
//        0，接收应答成功
uint8_t IIC_Wait_Ack(const IIC_SOFT_TypeDef *pSoftIIC)
{
	uint8_t ucErrTime=0;
	// SDA_IN();      //SDA设置为输入  
    IIC_SDA_Mode_In( pSoftIIC); //SDA设置为输入  

	GPIO_WRITE_PIN(pSoftIIC->sda_port, pSoftIIC->sda_pin, 1);delay_us(1);	   
	GPIO_WRITE_PIN(pSoftIIC->scl_port, pSoftIIC->scl_pin, 1);delay_us(1);	 
	while(IIC_READ_SDA_Pin(pSoftIIC))
	// while( READ_SDA() )
	{
		ucErrTime++;
		if(ucErrTime>250)
		{
			IIC_Stop(pSoftIIC);
			return 1;
		}
	}
	GPIO_WRITE_PIN(pSoftIIC->scl_port, pSoftIIC->scl_pin, 0);//时钟输出0 	   
	return 0;  
} 
//产生ACK应答
void IIC_Ack(const IIC_SOFT_TypeDef *pSoftIIC)
{
	GPIO_WRITE_PIN(pSoftIIC->scl_port, pSoftIIC->scl_pin, 0);

	// SDA_OUT();//sda线输出
    IIC_SDA_Mode_Out( pSoftIIC); //sda线输出  

	GPIO_WRITE_PIN(pSoftIIC->sda_port, pSoftIIC->sda_pin, 0);
	delay_us(2);
	GPIO_WRITE_PIN(pSoftIIC->scl_port, pSoftIIC->scl_pin, 1);
	delay_us(2);
	GPIO_WRITE_PIN(pSoftIIC->scl_port, pSoftIIC->scl_pin, 0);
}
//不产生ACK应答		    
void IIC_NAck(const IIC_SOFT_TypeDef *pSoftIIC)
{
	GPIO_WRITE_PIN(pSoftIIC->scl_port, pSoftIIC->scl_pin, 0);

	// SDA_OUT();//sda线输出
    IIC_SDA_Mode_Out( pSoftIIC); //sda线输出  

	GPIO_WRITE_PIN(pSoftIIC->sda_port, pSoftIIC->sda_pin, 1);
	delay_us(2);
	GPIO_WRITE_PIN(pSoftIIC->scl_port, pSoftIIC->scl_pin, 1);
	delay_us(2);
	GPIO_WRITE_PIN(pSoftIIC->scl_port, pSoftIIC->scl_pin, 0);
}					 				     
//IIC发送一个字节
//返回从机有无应答
//1，有应答
//0，无应答			  
void IIC_Send_Byte(const IIC_SOFT_TypeDef *pSoftIIC,uint8_t txd)
{                        
    uint8_t t;   
	// SDA_OUT();//sda线输出
    IIC_SDA_Mode_Out( pSoftIIC); //sda线输出  

    GPIO_WRITE_PIN(pSoftIIC->scl_port, pSoftIIC->scl_pin, 0);//拉低时钟开始数据传输
    for(t=0;t<8;t++)
    {              
        // IIC_SDA=(txd&0x80)>>7;
        // IIC_SDA( (txd&0x80)>>7);
        GPIO_WRITE_PIN(pSoftIIC->sda_port, pSoftIIC->sda_pin, (txd&0x80)>>7 );
        txd<<=1; 	  
		delay_us(2);   //对TEA5767这三个延时都是必须的
		GPIO_WRITE_PIN(pSoftIIC->scl_port, pSoftIIC->scl_pin, 1);
		delay_us(2); 
		GPIO_WRITE_PIN(pSoftIIC->scl_port, pSoftIIC->scl_pin, 0);	
		delay_us(2);
    }	 
} 	    

uint8_t IIC_Read_Byte( const IIC_SOFT_TypeDef *pSoftIIC)
{
	unsigned char i,receive=0;

	// SDA_IN();      //SDA设置为输入  
    IIC_SDA_Mode_In( pSoftIIC); //SDA设置为输入  

    for(i=0;i<8;i++ )
	{
        GPIO_WRITE_PIN(pSoftIIC->scl_port, pSoftIIC->scl_pin, 0); 
        delay_us(2);
		GPIO_WRITE_PIN(pSoftIIC->scl_port, pSoftIIC->scl_pin, 1);
        receive<<=1;
        if(IIC_READ_SDA_Pin(pSoftIIC))receive++;   
        // if( READ_SDA() )receive++;   

		delay_us(1); 
    }					 
 
    return receive;
}

 uint8_t IIC_Write_Test(const IIC_SOFT_TypeDef *pSoftIIC , uint8_t reg_addr, uint8_t *buf, uint8_t len)
 {
    IIC_Start(pSoftIIC);  
	IIC_Send_Byte(pSoftIIC,pSoftIIC->addr & 0xFE);
	if(IIC_Wait_Ack(pSoftIIC)) 	{ IIC_Stop(pSoftIIC); return -1;}; 

	IIC_Send_Byte(pSoftIIC,reg_addr);
	if(IIC_Wait_Ack(pSoftIIC)) 	{ IIC_Stop(pSoftIIC); return -1;}; 

	IIC_Send_Byte(pSoftIIC,*buf);
	if(IIC_Wait_Ack(pSoftIIC)) 	{ IIC_Stop(pSoftIIC); return -1;}; 

    IIC_Stop(pSoftIIC);//产生一个停止条件 
	// HAL_Delay( 200 );
	// delay_us(6000);
	return 0;
}

// 寄存器地址 8位置
uint8_t IIC_Read_Test(const IIC_SOFT_TypeDef *pSoftIIC, uint8_t reg_addr, uint8_t *buf, uint8_t len)
{
	uint8_t temp=0;		  	    																 
    IIC_Start(pSoftIIC);  
	
	IIC_Send_Byte(pSoftIIC,pSoftIIC->addr & 0xFE);
	if(IIC_Wait_Ack(pSoftIIC)) 	{ IIC_Stop(pSoftIIC); return -1;}; 

	IIC_Send_Byte(pSoftIIC,reg_addr);
	if(IIC_Wait_Ack(pSoftIIC)) 	{ IIC_Stop(pSoftIIC); return -1;}; 

	IIC_Start(pSoftIIC);  	  
	IIC_Send_Byte(pSoftIIC,pSoftIIC->addr |0x01);           //进入接收模式	
	if(IIC_Wait_Ack(pSoftIIC)) 	{ IIC_Stop(pSoftIIC); return -1;}; 

	for(int i=0; i<len-1; i++)
	{
		*buf=IIC_Read_Byte(pSoftIIC);
        IIC_Ack(pSoftIIC);  // 应答
        buf++;
	}
	*buf = IIC_Read_Byte(pSoftIIC);// 读非应答
	IIC_NAck(pSoftIIC);
	// if(IIC_Wait_Ack()) 	{ IIC_Stop(); return -1;}; 

	IIC_Stop(pSoftIIC);
	return 0;
}