iic.c

感光芯片ISL9001控制程序源码

#include "iic.h"

void udelay(int time)
{
	int i;
	for(i=0;i<time;i++)
	{;}
}
static void setsda(int Type)
{
	UINT32 mask=0x2;
    GPIO->pbddr |= mask;

	if(Type)	
        GPIO->pbdr |= mask;
	else	
        GPIO->pbdr &= ~ mask;
	udelay(20);
}
static void setscl(int Type)
{
	UINT32 mask=0x4;
    GPIO->pbddr |= mask;

	if(Type)	
        GPIO->pbdr |= mask;
	else	
        GPIO->pbdr &= ~ mask;
	udelay(20);
}
static int getsda()
{
	UINT32 mask=0x2;
	udelay(20);
    GPIO->pbddr &= ~ mask;
	
	if(GPIO->pbdr & mask) 	
		return 1;
	else 			
		return 0;	
}
/*
error message:
return 0:ok,start success!
return 1:can't setsda=1,can't start!
return 2:can't setsda=0,can't start!
*/
int SendStart()
{
	setscl(1);	/**/
	if(!getsda()) /*if sda=0*/
	{
		setsda(1);
		if(!getsda()) return 1;
	}
	/*sda=1*/
	setsda(0);
	if(getsda()) return 2;
	return 0;
}
/*
error message:
return 0:ok,stop success!
return 1:can't setsda=1,can't stop!
return 2:can't setsda=0,can't stop!
*/

int SendStop()
{
	setscl(1);	/**/
	if(getsda()) /*if sda=1*/
	{
		setsda(0);
		if(getsda()) return 2;
	}
	/*sda=0*/
	setsda(1);
	if(!getsda()) return 1;
	return 0;
}
/*
error message:
return 0:ok, success!
return 1:no ack!
*/
int WriteData(char data)
{
	char i,data1[8]= {0x80,0x40,0x20,0x10,0x8,0x4,0x2,0x1};
	int ret=0,timeout=0;
	setscl(0);
	for(i=0;i<8;i++)
	{
		if(data & data1[i])	setsda(1);
		else 			setsda(0);
		setscl(1);		setscl(0);
	}
	setscl(1);
	while(getsda())
	{
		timeout++;
		if(timeout>0x10){ SendStop(); /*printf("have no ack!\n");*/return 1; }
	}
	setscl(0); 	return 0;
}
int ReadData()
{
	char i,data1[8]= {0x80,0x40,0x20,0x10,0x8,0x4,0x2,0x1};
	int ret = 0,timeout= 0;
	setscl(0); 
	for(i=0;i<8;i++)
	{
		if(getsda())	ret|= data1[i];
		setscl(1);	
		setscl(0); 
	}	
	setsda(0);
	setscl(1);	
	setscl(0); 	

	return ret;
}

/**/
int ReadLightSensorValue(char *ptr,int count)
{
	int i;
	if(count>4) count=4;
	if(count<1) count=1;
	SendStart();
	WriteData(0x89);/*0x44<<1+1);*/
	for(i=0;i<4;i++)
	{
		ptr[i] = ReadData();
		if(i==count-1) break;
	}
	SendStop();
}

int SetLightSensor(ISL_COMMAND command)
{
	int ret;
	ret = SendStart();/**/
	WriteData(0x88);/*0x44*0x10) the first write addr*/
	WriteData(command);
	ret = SendStop();
}
int Read_LightSensor()
{
	char Temp[4];
	UINT32 Value;
	ReadLightSensorValue(Temp,4);
	Value = Temp[1]*0xff+Temp[0];
	Value = Value*10000/32768;
	return Value;
}
/*set iic bus and initial the light sensor*/ 
void Init_iic()
{
	UINT32 mask=0x8,mask1 = 0x20;
	GPIO->pbdr &= ~mask; /*initial the key backlight control signal*/
	GPIO->pinmux &= ~mask;  /*set the UART3CON =0 ,gpio function*/
    GPIO->pbddr |= mask1; /*set PB5 is GPIO_OUTPUT*/
	GPIO->pbdr &= ~mask1; /*enable ISL9001*/
    SetLightSensor(ISL_COMMAND_RST);
    SetLightSensor(ISL_COMMAND_CVT1_INT);
}

/*Set ISL9001 Power down on or off*/ 
void setLightSensorOn(unsigned char flag)
{
	UINT32 mask1 = 0x20;
    GPIO->pbddr |= mask1; /*set PB5 is GPIO_OUTPUT*/
   if(flag)
   {
		GPIO->pbdr &= ~mask1; /*enable ISL9001*/   
		SetLightSensor(ISL_COMMAND_RST);
		SetLightSensor(ISL_COMMAND_CVT1_INT);	
   }
   else
   {
		SetLightSensor(ISL_COMMAND_PWD);
		GPIO->pbdr |= mask1; /*enable ISL9001*/   
   }
}