i2c.c

tea5767_102模块,i2c总线控制方式

//i2c.c

#include "i2c.h"
#include <reg52.h>
#include <intrins.h>
#include "global.h"

/*
unsigned char i2c_EP_ok(void)
{
	unsigned char tmp;
	i2c_EP_start();
	i2c_EP_send(EEPROM_rd);
	tmp = i2c_EP_receive_Ack();
	i2c_EP_end();
	return tmp;
}
*/
void i2c_EP_start(void)
{
	i2c_EP_SCL_1;
	delay_us(10);
	i2c_EP_DA_1;
	delay_us(10);
	i2c_EP_DA_0;
	delay_us(10);
	i2c_EP_SCL_0;
	delay_us(10);
}

unsigned char 	i2c_EP_receive_Ack(void)
{
	unsigned char tmp;

	i2c_EP_SCL_1;
	tmp = 0;
	_nop_();
	while ((i2c_EP_DA_receive)&&(tmp<255))
	{
		tmp++;
	}
	i2c_EP_SCL_0;

	if (tmp == 255)
	   return FALSE;
	else return TRUE;
}
/*
void i2c_EP_send_Ack(void)
{
	i2c_EP_SCL_0;
	i2c_EP_DA_0;
	i2c_EP_SCL_1;
	_nop_();
	_nop_();
	i2c_EP_SCL_0;
	
}
*/
void i2c_EP_send(unsigned char ddd)
{
	unsigned char tmp,i,da;

	tmp = 0x80;
	da = ddd;

	for (i = 0; i < 8; i++)
	{
		i2c_EP_SCL_0;
		delay_us(10);

		if ( da & tmp )
 			i2c_EP_DA_1;
		else 	i2c_EP_DA_0;

		delay_us(10);

		i2c_EP_SCL_1;
		delay_us(10);
		
		i2c_EP_SCL_0;
		da =(da<<1);
	}
	delay_us(10);
	i2c_EP_DA_1;
	delay_us(10);

}

unsigned char i2c_EP_receive(void)
{
	unsigned char tmp,i;

	tmp = 0;

	for (i = 0; i < 8; i++)
	{
		i2c_EP_SCL_0;
		delay_us(10);
		i2c_EP_DA_1;
		delay_us(10);

		i2c_EP_SCL_1;
		delay_us(10);


		if ( i2c_EP_DA_receive )
 			tmp++;

		delay_us(10);
		
		i2c_EP_SCL_0;
		if (i != 7)
			tmp <<= 1;
	}
	return tmp;
}

 
void	i2c_EP_end()
{
	i2c_EP_SCL_0;
	i2c_EP_DA_0;
	delay_us(10);
	i2c_EP_SCL_1;
	delay_us(10);
	i2c_EP_DA_1;
}


unsigned char EEPROM_write(unsigned char uiAddress, unsigned char ucData)
{
	stopInterupt();

	i2c_EP_start();

	i2c_EP_send(EEPROM_wr);

	if (!i2c_EP_receive_Ack())
	   return FALSE;

	i2c_EP_send(uiAddress);

	if (!i2c_EP_receive_Ack())
	   return FALSE;

	i2c_EP_send(ucData);

	if (!i2c_EP_receive_Ack())
	   return FALSE;

	i2c_EP_end();

	delay_us(50);

	startInterupt();

}


unsigned char EEPROM_read(unsigned char uiAddress)
{
  	unsigned char tmp;

	stopInterupt();

	i2c_EP_start();

	i2c_EP_send(EEPROM_wr);

	if (!i2c_EP_receive_Ack())
	   return FALSE;
	
	i2c_EP_send(uiAddress);

	if (!i2c_EP_receive_Ack())
	   return FALSE;


	i2c_EP_start();
	
	i2c_EP_send(EEPROM_rd);

	if (!i2c_EP_receive_Ack())
	   return FALSE;

	tmp = i2c_EP_receive();

	i2c_EP_end();

	delay_us(50);
	startInterupt();

	return tmp;
}