echo.c

Using DSP/BIOS I/O in Multichannel Systems

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#include <std.h>
#include <mem.h>
#include <log.h>
#include <sio.h>
#include <tsk.h>

#define NUM_CHANNELS	2
#define SAMPLE_BUF_LEN 	160 /* number of samples in a frame */
#define SAMPLE_BUF_SIZE (SAMPLE_BUF_LEN * sizeof(unsigned short))
#define CHANNEL0		0
#define CHANNEL1		1

extern far LOG_Obj trace; 	   	/* application printf() log */ 
extern far LOG_Obj trace1;
extern far SIO_Obj inStream0;
extern far SIO_Obj outStream0;
extern far SIO_Obj inStream1;
extern far SIO_Obj outStream1;
extern Int IDRAM;

extern Void doLoad(int load);

void echo(Int channelNum);

typedef struct dataChannel {
	SIO_Obj 	*inStream;
	SIO_Obj 	*outStream;
    Ptr 		buf;
	Int			load;
} dataChannel;

dataChannel		audioChannel[NUM_CHANNELS];

Void initChannelData(void)
{
	dataChannel		*pChannel;
	   
	/* initialize structure for channel 0 */
	pChannel = &audioChannel[CHANNEL0];
	pChannel->inStream = &inStream0;
	pChannel->outStream = &outStream0;
	/* create the buffer used to prime the input stream */
    if (SIO_staticbuf(pChannel->inStream, &pChannel->buf) == 0) {
        SYS_abort("Cannot get static buffer");
    }       
    pChannel->load = 0;
    
    /* initialize structure for channel 1 */
	pChannel = &audioChannel[CHANNEL1];
	pChannel->inStream = &inStream1;
	pChannel->outStream = &outStream1;
    if (SIO_staticbuf(pChannel->inStream, &pChannel->buf) == 0) {
        SYS_abort("Cannot get static buffer");
    }       
    pChannel->load = 0;     
}

Bool processChannel(dataChannel *channel)
{   
	Int 	nbytes;
            
	LOG_printf(&trace1, "sio_get uses buffer 0x%x", channel->buf);
	
	nbytes = SIO_get(channel->inStream, &channel->buf);
	if (nbytes < 0)
		return(FALSE);
		
	LOG_printf(&trace1, "sio_get returns buffer 0x%x", channel->buf);
	
	/* processing of received buffer is done here */
	doLoad(channel->load);

	nbytes = SIO_put(channel->outStream, &channel->buf, nbytes);
	if (nbytes < 0)
		return(FALSE);
		
	LOG_printf(&trace1, "sio_put returns buffer 0x%x", channel->buf);
	return(TRUE);	
}

void echo(Int channelNum)
{
	while (TRUE) {
		LOG_printf(&trace1, "channel %d", channelNum);
		
		if (!processChannel(&audioChannel[channelNum])) {
			LOG_printf(&trace, "processing error on channel %d", channelNum);
		}
		
	}
}

main()
{
    initChannelData(); 
}