www.pudn.com > H265+_C64X_2008.8.rar > evmdm642_eeprom.c

/* 
 *  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  
#include  
#include  
 
#include  
#include  
 
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 */ 
}; 
 
/* 
 *  ======== EVMDM642_eeprom_read ======== 
 *  Read data from an I2C EEPROM 
 */ 
void EVMDM642_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(EVMDM642_I2C_hI2C)); 
 
    /* Save old settings */ 
    I2C_getConfig(EVMDM642_I2C_hI2C, &prevI2CCfg); 
     
    /* Set address using dummy write */ 
    EVMDM642_EEPROM_write(0, src, 0); 
 
    /* Configure for receive */ 
    I2C_config(EVMDM642_I2C_hI2C, &eepromRcvCfg); 
    EVMDM642_waitusec(1); 
   
    /* Generate start condition */ 
    I2C_start(EVMDM642_I2C_hI2C); 
 
    /* Receive the data */ 
    for (i = 0; i < length; i++) 
    { 
        while(!I2C_rrdy(EVMDM642_I2C_hI2C)); 
        *pdst++ = I2C_readByte(EVMDM642_I2C_hI2C); 
    } 
 
    /* Generate stop condition */ 
    I2C_sendStop(EVMDM642_I2C_hI2C); 
     
    /* Need to wait at least 10ms */ 
    EVMDM642_waitusec(10000); 
 
    /* Wait until bus is free */ 
    while (I2C_bb(EVMDM642_I2C_hI2C)); 
         
    /* Reconfigure I2C with old settings */ 
    I2C_config(EVMDM642_I2C_hI2C, &prevI2CCfg); 
} 
 
/* 
 *  ======== EVMDM642_eeprom_write ======== 
 *  Write data to an I2C EEPROM 
 */ 
void EVMDM642_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(EVMDM642_I2C_hI2C)); 
     
    /* Clear bus busy */ 
    I2C_FSETH(EVMDM642_I2C_hI2C, I2CSTR, BB, 1); 
 
    /* Save old settings */ 
    I2C_getConfig(EVMDM642_I2C_hI2C, &prevI2CCfg); 
     
    /* Configure for transmit */ 
    I2C_config(EVMDM642_I2C_hI2C, &eepromXmtCfg); 
    EVMDM642_waitusec(1); 
         
    /* Submit the high address byte */ 
    I2C_writeByte(EVMDM642_I2C_hI2C, (dst & 0xff00) >> 8); 
     
    /* Generate start condition */ 
    I2C_start(EVMDM642_I2C_hI2C); 
     
    while(!I2C_xrdy(EVMDM642_I2C_hI2C)); 
 
    /* Submit the low address byte */  
    I2C_writeByte(EVMDM642_I2C_hI2C, dst & 0xff); 
 
    while(!I2C_xrdy(EVMDM642_I2C_hI2C)); 
     
    /* Transmit the data */ 
    for (i = 0; i < length; i++) 
    { 
        I2C_writeByte(EVMDM642_I2C_hI2C, *psrc++); 
        while(!I2C_xrdy(EVMDM642_I2C_hI2C)); 
    } 
     
    /* Generate stop condition */ 
    I2C_sendStop(EVMDM642_I2C_hI2C); 
 
    /* Need to wait at least 10ms */ 
    EVMDM642_waitusec(10000); 
 
    /* Wait until bus is free */ 
    while (I2C_bb(EVMDM642_I2C_hI2C)); 
     
    /* Reconfigure I2C with old settings */ 
    I2C_config(EVMDM642_I2C_hI2C, &prevI2CCfg); 
}