iic.c

一个在ARM上通用的IIC的程序,已经测试用过了,

//***************************************************************************************************
//Chinese Academy of Sciences, Institute of Automation
//File Name:	main.c
//Description: 	IIC test 
//Author:	JuGuang,Lee
//***************************************************************************************************	 
#include "../inc/iic.h"
#include "../inc/board.h"
#include "../inc/utils.h"

void Delay1(int CNT)
{
	int i;
	for(i=0;i<CNT;i++);
} 

int IicRead(int addr, int size, int *buf)
{
	int error;
	error = DrvIicRead(addr, size, buf);
	return error;
}


int IicWrite(int addr, int size, int *pdata)
{
	int PageBuf[PAGE_SIZE];
	int page, no_of_page, error=0, i, remain_byte;
	
	no_of_page = size/PAGE_SIZE;
	remain_byte = size % PAGE_SIZE;
	if (no_of_page)
	{
		for(page=0; page<no_of_page; page++)
		{
			for(i=0; i<PAGE_SIZE; i++)
				PageBuf[i] = *pdata++;
			DrvIicWrite(addr, PAGE_SIZE, PageBuf);
			addr += PAGE_SIZE;
		}
	}
	if (remain_byte)
	{
		for(i=0; i<remain_byte; i++)
			PageBuf[i] = *pdata++;
		DrvIicWrite(addr, remain_byte, PageBuf);
	}

	return error;
}

int IicInit()
{
	int error = 0;

   	// reset the ICC
	IICCON = IICRESET; 

	// clock setup, ICC CLK = SysClk/(16 x (prescaker + 1) + 3), 100KHz at 50MHz
	IICPS = 0x0000001E;
	
	return error;
}


int DrvIicRead(int addr, int size, int *pdata)
{
	int error = 0, i;
	
   	// reset the IIC
	IicInit();

	// wait for not busy
	while(IICCON & BUSY);

	// Send Start: START | ACK
	IICCON = START | IIC_ACK;

	// send control byte (write cmd): read block 0 
	IICBUF = IIC_DEV_0 | S_WRITE ;
	while(!(IICCON & BF));

	// send lsb address
	IICBUF = (int)(addr & 0xFF);
	while(!(IICCON & BF));

	// send re-start and control byte (read cmd)
	IICCON = RESTART;		
	IICCON = START | IIC_ACK;	
	IICBUF = IIC_DEV_0 | S_READ ; 
	while(!(IICCON & BF));

	// Generate ACK for multi read
	IICCON = IIC_ACK;
	while(!(IICCON & BF));

	// Rx Data
	for(i=0; i<size; i++)
	{
		*pdata++ = IICBUF;
		while(!(IICCON & BF));
	}

	// Send NO ACK
	IICCON = NOACK; 
	while(!(IICCON & BF));

	// Send Stop
	IICCON = STOP; 

	return error;
}

int DrvIicWrite(int address, int size,int *pdata)
{
	int i;

   	// reset the ICC
	IicInit();

	// wait for not busy
	while(IICCON & BUSY);

	// Send Start: START | ACK
	IICCON = START | IIC_ACK;

	// send control byte (write cmd): read block 0 
	IICBUF = IIC_DEV_0 | S_WRITE;
	while(!(IICCON & BF));

	// send lsb address
	IICBUF = (int)(address & 0xFF);
	while(!(IICCON & BF));

	// Write data
	for(i=0; i<size; i++)
	{
		IICBUF = *pdata++;
		while(!(IICCON & BF));
	}

	// STOP IIC Controller
	IICCON = STOP;

	// 5 ms write cycle
	Delay1(100000);

	return 0;
}

void Iic_Test(void)
{
	int i;
	int size=0;
	char temp;
	int a[100];
	IicInit();	
	puts("\n 请输入要测试的数据 \n");
	while((temp=getch())!=ENTER_KEY)
	{
	 a[size]=(int)temp;
	 printf("\n a%i=%i \n",size,a[size]);;
	 size++;
	}
	//for(i=0;i<size;i++)printf("\n b%d=%d \n",i,a[i]);
	i=IicWrite(0x0,size,a);
	printf("\n 接受数字大小： %d  \n",size);
	puts("\n 请按ENTER键，进行读数据操作 \n");
	i=DrvIicRead(0x0,size,a);
	puts("读出的数据为：\n");
	for(i=0;i<size;i++)printf("\n a%i=%i \n",i,a[i]);
		
}