testi2c_1.c

ARM9.2的第6个程序！！！！！！！！！！！

//字节写，字节读(随机读)
//不成功，只显示"161"

#include "2440addr.h"
#include "2440lib.h"

void TestWriteByte(void);
void TestReadByte(void);

void xmain(void)
{	
	ChangeClockDivider(3,1);
	ChangeMPllValue(127,2,1);		//405MHZ
	
	Isr_Init();
	Uart_Init(0, 115200);
	Uart_Select(0);
	Uart_Printf("\nIIC test is beginning\n");
	
	//设置功能管脚,GPE14,GPE15
	//GPE14 -> SCL , GPE15 -> SDA
	rGPECON = (rGPECON | (0x0f<<14) ) & ( ~(0x05<<14) );
	rGPEUP |= (2<<14);//GPE14/GPE15 Pull-up disable	
	
	TestWriteByte();
	TestReadByte();
	while(1);
}

void TestWriteByte(void)
{
	U8 i;
	
	Uart_Printf("Test IIc Write\n");
	
	//I2C总线控制寄存器//0xaf
	rIICCON |=   (1<<7)//I2C-bus acknowledge enable bit
				&( ~(1<<6) )//0 = I2CCLK = fpclk/16
				|(1<<5)//Tx/Rxinterrupt enable
				&( ~(1<<4) )//Clear pending & Resume the operation
				|(0x0f<<0);//Tx clock = IICCLK/(x+1)
	
	//I2C状态寄存器
	//Master Transmit mode	
	rIICSTAT |=	 (3<<6)//11:Master transmit mode 
				&( ~(1<<5) )//0 = Stop signal
				|(1<<4);//Enable serial output
	
	//?
	rIICADD  = 0x10;//2410 slave address = [7:1]//I don't know?
	
	//IIC移位寄存器
	//0xa0, write Device address
	rIICDS |=  	 (0x0a<<4)//1010:EEPROM
				&( ~(7<<1) )//片选(Device address)
				&( ~(1<<0) );//Write				
	
	//I2C状态寄存器
	// START
	rIICSTAT |= (1<<5);//1 = Start signal
	
	//I2C总线控制寄存器
	//clear pending & Resume the opration
	rIICCON &=  ( ~(1<<4) );//Clear pending & Resume the operation
	
	//write word address	
	rIICDS = 1;//at 0x00	
	for(i=0;i<10;i++);//for setup time until rising edge of IICSCL
	
	//I2C总线控制寄存器
	//clear pending & Resume the opration
	rIICCON &=  ( ~(1<<4) );//Clear pending & Resume the operation
	
	//write data	
	rIICDS = 1;//write '2'
	for(i=0;i<10;i++);//for setup time until rising edge of IICSCL
	
	//I2C总线控制寄存器
	//clear pending & Resume the opration
	rIICCON &=  ( ~(1<<4) );//Clear pending & Resume the operation					
					
	//I2C状态寄存器
	// STOP
	rIICSTAT &= ( ~(1<<5) );//0 = Stop signal	
	
	//I2C总线控制寄存器
	//clear pending & Resume the opration
	rIICCON &=  ( ~(1<<4) );//Clear pending & Resume the operation																				
	Delay(1);//wait until stop condtion is in effect.
}

void TestReadByte(void)
{
	U8 i;
	static U8 buf=0;
	
	Uart_Printf("Test IIc Read\n");
	
	//I2C总线控制寄存器//0xaf
	rIICCON |=   (1<<7)//I2C-bus acknowledge enable bit
				&( ~(1<<6) )//0 = I2CCLK = fpclk/16
				|(1<<5)//Tx/Rxinterrupt enable
				&( ~(1<<4) )//Clear pending & Resume the operation
				|(0x0f<<0);//Tx clock = IICCLK/(x+1)
	
	//I2C状态寄存器
	//Master Transmit mode	
	rIICSTAT |=	 (3<<6)//11:Master transmit mode 
				&( ~(1<<5) )//0 = Stop signal
				|(1<<4);//Enable serial output
	
	//?
	rIICADD  = 0x10;//2410 slave address = [7:1]//I don't know?
	
	//IIC移位寄存器
	//0xa0, write Device address
	rIICDS |=  	 (0x0a<<4)//1010:EEPROM
				&( ~(7<<1) )//片选(Device address)
				|(1<<0);//1 = Read				
	
	//I2C状态寄存器
	// START
	rIICSTAT |= (1<<5);//1 = Start signal
	
	//I2C总线控制寄存器
	//clear pending & Resume the opration
	rIICCON &=  ( ~(1<<4) );//Clear pending & Resume the operation
	
	//write word address	
	rIICDS = 1;//at 0x00	
	for(i=0;i<10;i++);//for setup time until rising edge of IICSCL
	
	//I2C总线控制寄存器
	//clear pending & Resume the opration
	rIICCON &=  ( ~(1<<4) );//Clear pending & Resume the operation		
	
	//IIC移位寄存器
	//0xa0, write Device address
	rIICDS |=  	 (0x0a<<4)//1010:EEPROM
				&( ~(7<<1) )//片选(Device address)
				|(1<<0);//1 = Read				
	
	//I2C状态寄存器
	// START
	rIICSTAT |= (1<<5);//1 = Start signal
	
	//I2C总线控制寄存器
	//clear pending & Resume the opration
	rIICCON &=   ( ~(1<<7) )//disable acknowledge bit
				&( ~(1<<4) );//Clear pending & Resume the operation
	
	//Read data	
	buf = rIICDS;
	for(i=0;i<10;i++);//for setup time until rising edge of IICSCL
	
	//I2C总线控制寄存器
	//clear pending & Resume the opration
	rIICCON |=   (1<<7)
				&( ~(1<<4) );//Clear pending & Resume the operation					
					
	//I2C状态寄存器
	// STOP
	rIICSTAT &= ( ~(1<<5) );//0 = Stop signal
	
	//I2C总线控制寄存器
	//clear pending & Resume the opration
	rIICCON &=  ( ~(1<<4) );//Clear pending & Resume the operation	
	Delay(1);//wait until stop condtion is in effect.
	
	Uart_Printf("%2d\n ",buf);//show out	
}