#include "bsp_i2c.h"
#ifdef USE_I2C
#include "bsp_pin.h"

uint8_t D[4] = {0};

//IIC初始化
void IIC_Init(void)
{
    GPIO_InitTypeDef GPIO_Initure;
    
    __HAL_RCC_GPIOB_CLK_ENABLE();   //使能GPIOB时钟
    
    //PB6,7初始化设置
    GPIO_Initure.Pin=GPIO_PIN_6|GPIO_PIN_7;
    GPIO_Initure.Mode=GPIO_MODE_OUTPUT_PP;  //推挽输出
    GPIO_Initure.Pull=GPIO_PULLUP;          //上拉
    GPIO_Initure.Speed=GPIO_SPEED_HIGH;     //高速
    HAL_GPIO_Init(GPIOB,&GPIO_Initure);
    
    IIC_SDA(1);
    IIC_SCL(1);  
}

//产生IIC起始信号
void IIC_Start(void)
{
	SDA_OUT();     //sda线输出
	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);//钳住I2C总线，准备发送或接收数据 
}	  
//产生IIC停止信号
void IIC_Stop(void)
{
	SDA_OUT();//sda线输出
	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);//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(void)
{
	uint8_t ucErrTime=0;
	SDA_IN();      //SDA设置为输入  
	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);//时钟输出0 	   
	return 0;  
} 
//产生ACK应答
void IIC_Ack(void)
{
	IIC_SCL(0);
	SDA_OUT();
	IIC_SDA(0);
	delay_us(2);
	IIC_SCL(1);
	delay_us(2);
	IIC_SCL(0);
}
//不产生ACK应答		    
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(uint8_t txd)
{                        
    uint8_t t;   
	SDA_OUT(); 	    
    IIC_SCL(0);//拉低时钟开始数据传输
    for(t=0;t<8;t++)
    {              
        IIC_SDA((txd&0x80)>>7);
        txd<<=1; 	  
		delay_us(2);   //对TEA5767这三个延时都是必须的
		IIC_SCL(1);
		delay_us(2); 
		IIC_SCL(0);	
		delay_us(2);
    }	 
} 	    
//读1个字节，ack=1时，发送ACK，ack=0，发送nACK   
uint8_t IIC_Read_Byte(uint8_t ack)
{
	uint8_t i,receive=0;
	SDA_IN();//SDA设置为输入
    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();//发送nACK
    else
        IIC_Ack(); //发送ACK   
    return receive;
}

uint8_t PCF8591_ADC_Input(uint8_t WriteAddr, uint8_t Channel)
{
    uint8_t temp = 0;
    IIC_Start();
    IIC_Send_Byte(WriteAddr);
    IIC_Wait_Ack();
    IIC_Send_Byte(Channel);
    IIC_Wait_Ack();
    IIC_Stop();
    IIC_Start();
    IIC_Send_Byte(WriteAddr | 0x01);
    IIC_Wait_Ack();
    temp = IIC_Read_Byte(0);
    IIC_Stop();
    return temp;
}

void IIC_TEST(void)
{
    D[0] = PCF8591_ADC_Input(PCF8591,0x40);
    D[1] = PCF8591_ADC_Input(PCF8591,0x41);
    D[2] = PCF8591_ADC_Input(PCF8591,0x42);
    D[3] = PCF8591_ADC_Input(PCF8591,0x43);
    printf("%d\t%d\t%d\t%d\r\n", D[0], D[1], D[2], D[3]);
}
#endif