/**********************************************************\
 *      LOOP.C
 *   
 *      A simple audio I/O function.
 *    
 *      S. Weiss / A. Shligersky, University of Southampton
 *      16/2/2003
 **********************************************************/

/**********************************************************\
 *	Prototypes
\**********************************************************/
void codec_init(void);
void init_HWI(void);

/**********************************************************\
 *	Include Files
\**********************************************************/
#include <c6x.h>           // C6000 compiler definitions
#include <csl.h>           // CSL headers
#include <csl_irq.h>
#include <csl_mcbsp.h>
#include <bsl.h>           // BSL headers
#include <bsl_ad535.h>     
#include <bsl_suggestions.h>

/**********************************************************\
 *      Global Variables  
\**********************************************************/
AD535_Handle hAD535;                                       
    AD535_Config my_AD535_Config = {                       
        AD535_LOOPBACK_DISABLE,                            
        AD535_MICGAIN_OFF,                                 
        AD535_GAIN_0DB,                                    
        AD535_GAIN_0DB                                     
    };                                                     
volatile short in_sample, out_sample;

                             // PUT YOUR GLOBAL VARIABLE HERE

/**********************************************************\
 *      Main Routine
\**********************************************************/
void main()
{
                             // HERE YOU NEED TO INITIALISE YOUR
                             // TDL VALUES TO ZERO
    CSL_init();              // Initialize CSL library
    BSL_init();              // Initialize BSL library
    codec_init();            // Initialise the AD535 codec
    init_HWI();              // Initialisa hardware interrupts
    AD535_write(hAD535, 0);  // Write anything to cause mcbsp
                             // to start transmitting interrupts 
    while(1);                // Loop idle while processing is 
                             // performed in the Receive ISR
}

/**********************************************************\
 *      Initialisation of Hardware Interrupts
\**********************************************************/
void init_HWI(void)
{
	IRQ_globalEnable();             // Enable ints globally
	IRQ_enable(IRQ_EVT_XINT0);	// Enable McBSP0 transmit interrupt
        IRQ_enable(IRQ_EVT_RINT0);	// Enable McBSP0 receive interrupt
}

/**********************************************************\
 *      Transmit Interrupt Service Routine
\**********************************************************/
void XINT0_HWI(void)
{
  AD535_HWI_write(hAD535,out_sample);
}

/**********************************************************\
 *      Receive Interrupt Service Routine
\**********************************************************/
void RINT0_HWI(void)
{
  float dummy;

  in_sample=AD535_HWI_read(hAD535);     // input in a sample
  
  dummy = (float) in_sample;            // PLACE YOUR PROCESSING
  out_sample = (short) dummy;           // HERE
}

/**********************************************************\
 *	Codec Initialisation
\**********************************************************/
void codec_init()
{
	hAD535 = AD535_open(AD535_localId);      
	AD535_reset(hAD535);                     
	AD535_config(hAD535, &my_AD535_Config);
	MCBSP_setfree(0);
}