evmdm642_eeprom.c

dsp中关于I2C 的接收数据的操作

/*
 *  Copyright 2003 by Spectrum Digital Incorporated.
 *  All rights reserved. Property of Spectrum Digital Incorporated.
 */

/*
 *  ======== evmdm642_eeprom.c ========
 *  I2C EEPROM module implementation for DM642 EVM
 */

#include <std.h>
#include <csl.h>
#include <csl_i2c.h>

#include "evmdm642_i2c.h"
#include "evmdm642_eeprom_i2c.h"

I2C_Config myeepromRcvCfg = {
    0x0000007f, /* I2COAR -    Not used if master */
    0x00000008, /* I2CIER -    Disable interrupts, use polling */
    0x0000001b, /* I2CCLKL -   Low period for 100KHz operation */
    0x0000001b, /* I2CCLKH -   High period for 100KHz operation */
    0x00000002, /* I2CCNT -    Data words per transmission */
    0x00000050, /* I2CSAR -    Slave address */
    0x000064a0, /* I2CMDR -    Mode */
    0x00000019  /* I2CPSC -    Prescale 300MHz to 12MHz */
};

I2C_Config myeepromXmtCfg = {
        0x0000007f, /* I2COAR -    Not used if master */
        0x00000010, /* I2CIER -    Disable interrupts, use polling */
        0x0000001b, /* I2CCLKL -   Low period for 100KHz operation */
        0x0000001b, /* I2CCLKH -   High period for 100KHz operation */
        0x00000002, /* I2CCNT -    Data words per transmission */
        0x00000050, /* I2CSAR -    Slave address */
        0x00004680, /* I2CMDR -    Mode */
        0x00000019  /* I2CPSC -    Prescale 300MHz to 12MHz */
    };  

static I2C_Config eepromRcvCfg = {
    0x0000007f, /* I2COAR -    Not used if master */
    0x00000000, /* I2CIER -    Disable interrupts, use polling */
    0x0000001b, /* I2CCLKL -   Low period for 100KHz operation */
    0x0000001b, /* I2CCLKH -   High period for 100KHz operation */
    0x00000002, /* I2CCNT -    Data words per transmission */
    0x00000050, /* I2CSAR -    Slave address */
    0x000044a0, /* I2CMDR -    Mode */
    0x00000019  /* I2CPSC -    Prescale 300MHz to 12MHz */
};

static I2C_Config eepromXmtCfg = {
    0x0000007f, /* I2COAR -    Not used if master */
    0x00000000, /* I2CIER -    Disable interrupts, use polling */
    0x0000001b, /* I2CCLKL -   Low period for 100KHz operation */
    0x0000001b, /* I2CCLKH -   High period for 100KHz operation */
    0x00000002, /* I2CCNT -    Data words per transmission */
    0x00000050, /* I2CSAR -    Slave address */
    0x000046a0, /* I2CMDR -    Mode */
    0x00000019  /* I2CPSC -    Prescale 300MHz to 12MHz */
};

interrupt void I2C_Int()
{	   	
	Uint8 aa;
	 //send the address in the eeprom
	if(op<2)
	{		
		I2C_writeByte(I2C_hI2C, addr[op]);
		op++;				
	}	
	else
	{
		if(op==2)
		{
			I2C_config(I2C_hI2C, &myeepromRcvCfg);			
    		op++; 
		}
		else
		{
			bufferR[index]= I2C_readByte(I2C_hI2C);
			index++;
			if(index>=length)
			{
				I2C_sendStop(I2C_hI2C);									
				index=0;
				op=0;
				loop=0;	
				waitusec(10000);
				I2C_config(I2C_hI2C, &myeepromXmtCfg);
			 }
		 } 	  	
	}		 	
   aa=0;   
}
/*
 *  ======== EVMDM642_eeprom_read ========
 *  Read data from an I2C EEPROM
 */
void EEPROM_read(Uint32 src, Uint32 dst, Uint32 length)
{
    Uint8 *pdst;
    Uint32 i;
    I2C_Config prevI2CCfg;
        
    /* Establish destination pointer */
    pdst = (Uint8 *)dst;

    /* Wait until bus is free */
    while (I2C_bb(I2C_hI2C));

    /* Save old settings */
    I2C_getConfig(I2C_hI2C, &prevI2CCfg);
    
    /* Set address using dummy write */
    EEPROM_write(0, src, 0);

    /* Configure for receive */
    I2C_config(I2C_hI2C, &eepromRcvCfg);
    waitusec(1);
  
    /* Generate start condition */
    I2C_start(I2C_hI2C);

    /* Receive the data */
    for (i = 0; i < length; i++)
    {
        while(!I2C_rrdy(I2C_hI2C));
        *pdst++ = I2C_readByte(I2C_hI2C);
    }

    /* Generate stop condition */
    I2C_sendStop(I2C_hI2C);
    
    /* Need to wait at least 10ms */
    waitusec(10000);

    /* Wait until bus is free */
    while (I2C_bb(I2C_hI2C));
        
    /* Reconfigure I2C with old settings */
    I2C_config(I2C_hI2C, &prevI2CCfg);
}

/*
 *  ======== EVMDM642_eeprom_write ========
 *  Write data to an I2C EEPROM
 */
void EEPROM_write(Uint32 src, Uint32 dst, Uint32 length)
{
    Uint8 *psrc;
    Uint32 i;
    I2C_Config prevI2CCfg;
        
    /* Establish source pointer */
    psrc = (Uint8 *)src;
    
    /* Wait until bus is free */
    while (I2C_bb(I2C_hI2C));
    
    /* Clear bus busy */
    I2C_FSETH(I2C_hI2C, I2CSTR, BB, 1);

    /* Save old settings */
    I2C_getConfig(I2C_hI2C, &prevI2CCfg);
    
    /* Configure for transmit */
    I2C_config(I2C_hI2C, &eepromXmtCfg);
    waitusec(1);
        
    /* Submit the high address byte */
    I2C_writeByte(I2C_hI2C, (dst & 0xff00) >> 8);
    
    /* Generate start condition */
    I2C_start(I2C_hI2C);
    
    while(!I2C_xrdy(I2C_hI2C));

    /* Submit the low address byte */ 
    I2C_writeByte(I2C_hI2C, dst & 0xff);

    while(!I2C_xrdy(I2C_hI2C));
    
    /* Transmit the data */
    for (i = 0; i < length; i++)
    {
        I2C_writeByte(I2C_hI2C, *psrc++);
        while(!I2C_xrdy(I2C_hI2C));
    }
    
    /* Generate stop condition */
    I2C_sendStop(I2C_hI2C);

    /* Need to wait at least 10ms */
   waitusec(10000);

    /* Wait until bus is free */
    while (I2C_bb(I2C_hI2C));
    
    /* Reconfigure I2C with old settings */
    I2C_config(I2C_hI2C, &prevI2CCfg);
}