CODEC__spi.c

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/*****************************************************************************
                           C   M O D U L E   F I L E

    Copyright (c) 2003 Neuros Audio LLC, All rights reserved.

******************************************************************************/


/*-- HEADER FILE INCLUDES ---------------------------------------------------*/
#include "../SYSTEM/sys_hardware.h"
#include "codec.h"

/*-- LOCAL DEFINITIONS ------------------------------------------------------*/

/*-- STATIC DATA ------------------------------------------------------------*/

/*-- GLOBAL DATA ------------------------------------------------------------*/

/*-- FUNCTIONS --------------------------------------------------------------*/
#pragma CODE_SECTION(CODEC__spiWrite, ".sram0_resident")
void CODEC__spiWrite(unsigned short cmd)
{
    unsigned short i;
    unsigned short iTmp;

    SPI_lock(SYS_FOREVER);
        
    // clear the clock.  All data is latched in on the rising edge.
    iTmp = SPI_CLK;      
    
    // clear tuner data line to set to input.
    //iTmp = TUNER_DAT; 
    
    // clear the CODEC enable to enable.    
    iTmp = CODEC_EN;
    SYS_delayMicrosecond(1);
    for (i = 0; i < 16; i++)
    {
        iTmp = SPI_CLK;                 
        
        if (cmd & 0x8000) SPI_DATA = 0x0;
        else iTmp = SPI_DATA;
        
        SYS_delayMicrosecond(1);
        SPI_CLK = 0x0;
        SYS_delayMicrosecond(1);
        cmd = cmd<<1;
    }
    
    // disable the EEPROM;
    //  asm (" ssbx XF");       
        
    // clear SPI clock 
    iTmp = SPI_CLK;         
        
    // clear the DATA line, set to input.
    iTmp = SPI_DATA;
        
    // clear the DATA line on the tuner to set to input
    //iTmp = TUNER_DAT;     
        
    // set codec enable to disable
    CODEC_EN = 0x0; 
        
    // put tuner in read mode.
    //iTmp = TUNER_WR;
    
    SPI_unlock();
}


/*****************************************************************************
                Neuros Audio LLC. Confidential Proprietary
 *****************************************************************************/

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