///////////////////////////////////////////////////////////////////////////////////////
//NAME:     init8416viaSPI.c (Block-based Talkthrough)
//DATE:     9/18/03
//PURPOSE:  Talkthrough framework for receiving SPDIF samples and sending to the AD1835.
//
//USAGE:    This file contains the subroutines for accessing the AD1835 control
//          registers via SPI.
//
////////////////////////////////////////////////////////////////////////////////////////
#include "tt.h"
#include "CS8416.h"
#include <SRU.h>

void SetupSPICS8416(void);
void DisableSPICS8416(void);
void SetupSPICS8416(void);
void DisableSPICS8416(void);


// Set up the SPI port to access the CS8416
void SetupSPICS8416 ()
{
    // Flush the SPI transceive FIFOs
    *(volatile int *)SPICTL = (TXFLSH | RXFLSH);

    // Setup the baud rate to 1MHz
    *(volatile int *)SPIBAUD = 100;

    // Flag pins are not being used as the device select
    *(volatile int *)SPIFLG = 0;

    // Now configure the SPI control register
    *(volatile int *)SPICTL = (SPIEN | SPIMS | MSBF | TIMOD1);
}



// Disable the SPI Port and flush the transceive FIFOs
void DisableSPICS8416 ()
{
    *(volatile int *)SPICTL = (TXFLSH | RXFLSH);
}



// Read a register from the CS8416
unsigned int ReadCS8416Register (int addr)
{
    SetupSPICS8416 ();
    SRU(LOW,DAI_PB15_I);

    TxCS8416SPI(SPDIF_WRITE_REG);
    TxCS8416SPI(addr);


    SRU(HIGH,DAI_PB15_I);
    Delay (100) ;
    SRU(LOW,DAI_PB15_I);

    // Write a dummy value to clock the output
    TxCS8416SPI(SPDIF_READ_REG);
    TxCS8416SPI(0x00);

    SRU(HIGH,DAI_PB15_I);

    DisableSPICS8416 ();
    return *(volatile int *)RXSPI ;
}



unsigned int TxCS8416SPI(int val)
{
    *(volatile int *)TXSPI = val;
    Delay (100) ;

    while (1)    // Wait for the SPI port to finish
    {
        if ( SPIF & *(volatile int *)SPISTAT)
            break;
    }
    Delay (100) ;
    return *(volatile int *)RXSPI;
}



// Send a word to the CS8416 via SPI
void WriteCS8416Register (int add, int val)
{
    SRU(LOW,DAI_PB15_I);

    TxCS8416SPI(SPDIF_WRITE_REG);
    TxCS8416SPI(add);
    TxCS8416SPI(val);

    SRU(HIGH,DAI_PB15_I);
}


//Set up all CS8416 registers via SPI
void InitCS8416viaSPI()
{
    outputMuted = 0;

    SetupSPICS8416 () ;
    WriteCS8416Register(SPDIF_CTRL1,        (0x00));
    WriteCS8416Register(SPDIF_CTRL2,         GPO_NON_AUDIO);
    WriteCS8416Register(SPDIF_CTRL3,        (0xC0));
    WriteCS8416Register(SPDIF_CTRL4,        (0x81));
    WriteCS8416Register(SPDIF_DATA_FORMAT,   FRMT_I2S);
    WriteCS8416Register(SPDIF_RX_ERR_MASK,  (0x00));
    WriteCS8416Register(SPDIF_INT_MASK,     (0x00));
    WriteCS8416Register(SPDIF_INT_MODE_MSB, (0x00));
    WriteCS8416Register(SPDIF_INT_MODE_LSB, (0x00));
    DisableSPICS8416 () ;


}