iic_test.c

S3C2410底层驱动KEIL版--IIC

/*********************************************************************************************
* File name:	iic.c
* Author:		Embest
* Descript:		iic source code. 
* History:
*			wang Fub 16th 2006	
*********************************************************************************************/

/*------------------------------------------------------------------------------------------*/
/*	 								include files						 				    */
/*------------------------------------------------------------------------------------------*/
#include "2410lib.h"

/*------------------------------------------------------------------------------------------*/
/*	 								global variables					 				    */
/*------------------------------------------------------------------------------------------*/
int f_nGetACK;

/*********************************************************************************************
* name:		iic_write_24c08
* func:		write data to 24C08
* para:		unSlaveAddr --- input, chip slave address
*			unAddr		--- input, data address
*			ucData    	--- input, data value
* ret:		none
* modify:
* comment:		
*********************************************************************************************/
void iic_write_24c08(UINT32T unSlaveAddr,UINT32T unAddr,UINT8T ucData)
{
	f_nGetACK = 0;
    
    // Send control byte
    rIICDS = unSlaveAddr;										// 0xa0
    rIICSTAT = 0xf0;											// Master Tx,Start

    while(f_nGetACK == 0);										// Wait ACK
    f_nGetACK = 0;
    
    //Send address
    rIICDS = unAddr;
    rIICCON = 0xaf;												// Resumes IIC operation.
    
    while(f_nGetACK == 0);										// Wait ACK
    f_nGetACK = 0;
    
    // Send data 
    rIICDS = ucData;
    rIICCON = 0xaf;												// Resumes IIC operation.
    
    while(f_nGetACK == 0);										// Wait ACK
    f_nGetACK = 0;
    
    // End send
    rIICSTAT = 0xd0;											// Stop Master Tx condition
    rIICCON = 0xaf;												// Resumes IIC operation.
    delay(5);													// Wait until stop condtion is in effect.
}

/*********************************************************************************************
* name:		iic_read_24c040
* func:		read data from 24C040
* para:		unSlaveAddr --- input, chip slave address
*			unAddr		--- input, data address
*			pData    	--- output, data pointer
* ret:		none
* modify:
* comment:		
*********************************************************************************************/
void iic_read_24c08(UINT32T unSlaveAddr,UINT32T unAddr,UINT8T *pData)
{
	char cRecvByte;	
	f_nGetACK = 0;

    //Send control byte 
    rIICDS = unSlaveAddr;										// 0xa0
    rIICSTAT = 0xf0;											// Master Tx,Start

    while(f_nGetACK == 0);										// Wait ACK
    f_nGetACK = 0;

    // Send address
    rIICDS = unAddr;
    rIICCON = 0xaf;												// Resumes IIC operation.
    
    while(f_nGetACK == 0);										// Wait ACK
    f_nGetACK = 0;

    //Send control byte 
    rIICDS = unSlaveAddr;										// 0xa0
    rIICSTAT = 0xb0;											// Master Rx,Start
	rIICCON = 0xaf;												// Resumes IIC operation.   
	
    while(f_nGetACK == 0);										// Wait ACK
    f_nGetACK = 0;
    
    //Get data 
    cRecvByte = rIICDS;
    rIICCON = 0x2f;
    delay(1);
    
    // Get data 
    cRecvByte = rIICDS;
    
    // End receive 
    rIICSTAT = 0x90;											// Stop Master Rx condition 
	rIICCON = 0xaf;												// Resumes IIC operation.
	delay(5);													// Wait until stop condtion is in effect.
	
    *pData = cRecvByte;
}

/*********************************************************************************************
* name:		iic_int_24c04()
* func:		IIC interrupt handler
* para:		none
* ret:		none
* modify:
* comment:		
*********************************************************************************************/
void __irq iic_int_24c08(void)
{
    ClearPending(BIT_IIC);
	f_nGetACK = 1;
}

/*********************************************************************************************
* name:		iic_test
* func:		test iic
* para:		none
* ret:		none
* modify:
* comment:		
*********************************************************************************************/
void iic_test(void)
{
    UINT8T 			szData[16];
    unsigned int 	i;

	uart_printf("\n IIC Protocol Test Example, using AT24C08...\n");
    uart_printf(" Write char 0-f into AT24C08\n");

	f_nGetACK = 0;

    // Enable interrupt
	rINTMOD  = 0x0;
    ClearPending(BIT_IIC);
	rINTMSK &= ~BIT_IIC;
    pISR_IIC = (unsigned)iic_int_24c08;

	// Initialize iic
	rIICADD = 0x10;					// S3C2410X slave address 
    rIICCON = 0xaf;					// Enable ACK, interrupt, SET IICCLK=MCLK/16
    rIICSTAT = 0x10;				// Enable TX/RX 

	// Write 0 - 16 to 24C04
    for(i=0; i<16; i++)
    {
		iic_write_24c08(0xa0, i, i);
		uart_printf(" %d",i);
		delay(10);
	}
	// Clear array
    for(i=0; i<16; i++)
		szData[i]=0;
    
    // Read 16 byte from 24C04
    for(i=0; i<16; i++)
		iic_read_24c08(0xa0, i, &(szData[i])); 

	// Printf read data
    uart_printf(" \nRead 16 bytes from AT24C08\n");
	for(i=0; i<16; i++)
		uart_printf(" %2x ", szData[i]);
    
	rINTMSK |= BIT_IIC;
	uart_printf("\n end.\n");
}