dss_isr.c

Using DSP/BIOS I/O in Multichannel Systems

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#include <std.h>
#include <swi.h>
#include <log.h>

#include "dss_isr.h"

static unsigned short *rxBuf[2]; /* Head of the receive buffer. Public,
			 returned by dss_isr_get_rxBuf. Initialized
			 by dss_isr_set_rxBuf().*/
static unsigned short *txBuf[2]; /* Head of the transmit buffer. Public, returned by
			 dss_isr_get_txBuf. Initialized by
			 dss_isr_set_txBuf(). */

far SWI_Obj *dss_isr_swi[2];/* The SWI to post when new buffers are needed. */ 
extern far LOG_Obj trace;
    
unsigned short *dss_isr_rxPtr[2]; /* Next insertion point. Used by isr. */
int dss_isr_rxCnt[2];  /* Number of elements left in rxBuf. Used by
			  isr. Initialized by dss_isr_set_rxBuf(). */

unsigned short *dss_isr_txPtr[2]; /* Next read point. Private, Used by isr. */
int dss_isr_txCnt[2];  /* Number of elements left in txBuf. Used by isr,
		       initialized by dss_isr_set_txBuf(). */

void
dss_isr_init()
{
    /* set counters so interrupts can be started */
    dss_isr_rxCnt[0] = dss_isr_rxCnt[1] = 0;
    dss_isr_txCnt[0] = dss_isr_txCnt[1] = 0;

    /* call platform dependent init */
    dss_isr_init_platform();
}

/*
 * Set and get the tx and rx buffers. These should only be called from within
 * the SWI call back.
 * */
void
dss_isr_set_rxBuf_n(unsigned short *ptr, int size, int chan)
{ 
#if DEBUG
	LOG_printf(&trace, "set rxbuf size=%d  chan=%d", size, chan);
	LOG_printf(&trace, "set rxbuf addr=0x%x", ptr);
#endif
    /* work around arg limits in LOG_message */
    if (chan == 0) {
		LOG_message("Setting rx buffer for channel 0, size %d", size);
    } else {
		LOG_message("Setting rx buffer for channel 1, size %d", size);
    }
    
    rxBuf[chan] = ptr;
    dss_isr_rxPtr[chan] = rxBuf[chan];
    dss_isr_rxCnt[chan] = size;
}

/*
 * Called from within the SWI to retrieve the newly filled buffer 
 * */
unsigned short *
dss_isr_get_rxBuf_n(int chan)
{
    return rxBuf[chan];
}

void
dss_isr_set_txBuf_n(unsigned short *ptr, int size, int chan)
{ 
#if DEBUG
	LOG_printf(&trace, "set txbuf size=%d  chan=%d", size, chan);
	LOG_printf(&trace, "set txbuf addr=0x%x", ptr);
#endif
    /* work around arg limits in LOG_message */
    if (chan == 0) {
		LOG_message("Setting tx buffer for channel 0, size %d", size);
    } 
    else {
		LOG_message("Setting tx buffer for channel 1, size %d", size);
    }
    
    txBuf[chan] = ptr;
    dss_isr_txPtr[chan] = txBuf[chan];
    dss_isr_txCnt[chan] = size;
}

unsigned short *
dss_isr_get_txBuf_n(int chan)
{
    return txBuf[chan];
}

int
dss_isr_get_rxCnt_n(int chan)
{
    return dss_isr_rxCnt[chan];
}

int
dss_isr_get_txCnt_n(int chan)
{
    return dss_isr_txCnt[chan];
}

void
dss_isr_set_swi_n(SWI_Obj *swi, int chan)
{
    dss_isr_swi[chan] = swi;
}