extern far void vectors();
void setupInterrupts(void);
/* Constants for the buffered ping-pong transfer */
#define BUFFSIZE 1000
#define PING 0
#define PONG 1
/*
* Data buffer declarations - the program uses four logical buffers of size
* BUFFSIZE, one ping and one pong buffer on both receive and transmit sides.
*/
Int16 gBufferXmtPing[BUFFSIZE]; // Transmit PING buffer
Int16 gBufferXmtPong[BUFFSIZE]; // Transmit PONG buffer
/*
* initMcbsp() - Initialize the McBSP for codec data transfers using the
* configuration define at the top of this file.
*/
void initMcbsp()
{
/* Open the codec data McBSP */
hMcbsp1 = MCBSP_open(MCBSP_DEV1, MCBSP_OPEN_RESET);
/* Configure the codec to match the AIC23 data format */
MCBSP_config(hMcbsp1, &mcbspCfg1);
/*
* initIrq() - Initialize and enable the DMA receive interrupt using the CSL.
* The interrupt service routine for this interrupt is edmaHwi.
*/
void initIrq(void)
{
/* Enable EDMA interrupts to the CPU */
IRQ_clear(IRQ_EVT_EDMAINT); // Clear any pending EDMA interrupts
IRQ_enable(IRQ_EVT_EDMAINT); // Enable EDMA interrupt
}
/*
* initEdma() - Initialize the DMA controller. Use linked transfers to
* automatically transition from ping to pong and visa-versa.
*/
void initEdma(void)
{
/* Configure transmit channel */
hEdmaXmt = EDMA_open(EDMA_CHA_XEVT1, EDMA_OPEN_RESET); // get hEdmaXmt handle and reset channel
hEdmaReloadXmtPing = EDMA_allocTable(-1); // get hEdmaReloadXmtPing handle
hEdmaReloadXmtPong = EDMA_allocTable(-1); // get hEdmaReloadXmtPong handle
gEdmaConfigXmt.dst = MCBSP_getXmtAddr(hMcbsp1); // set the desination address to McBSP1 DXR
gXmtChan = EDMA_intAlloc(-1); // get an open TCC
gEdmaConfigXmt.opt |= EDMA_FMK(OPT,TCC,gXmtChan); // set TCC to gXmtChan
EDMA_config(hEdmaXmt, &gEdmaConfigXmt); // then configure the registers
EDMA_config(hEdmaReloadXmtPing, &gEdmaConfigXmt); // and the reload for Ping
gEdmaConfigXmt.src = EDMA_SRC_OF(gBufferXmtPong); // change the structure to have a source of Pong
EDMA_config(hEdmaReloadXmtPong, &gEdmaConfigXmt); // and configure the reload for Pong
EDMA_link(hEdmaXmt,hEdmaReloadXmtPong); // link the regs to Pong
EDMA_link(hEdmaReloadXmtPong,hEdmaReloadXmtPing); // link Pong to Ping
EDMA_link(hEdmaReloadXmtPing,hEdmaReloadXmtPong); // and link Ping to Pong
/* Configure receive channel */
hEdmaRcv = EDMA_open(EDMA_CHA_REVT1, EDMA_OPEN_RESET); // get hEdmaRcv handle and reset channel
hEdmaReloadRcvPing = EDMA_allocTable(-1); // get hEdmaReloadRcvPing handle
hEdmaReloadRcvPong = EDMA_allocTable(-1); // get hEdmaReloadRcvPong handle
gEdmaConfigRcv.src = MCBSP_getRcvAddr(hMcbsp1); // and the desination address to McBSP1 DXR
gRcvChan = EDMA_intAlloc(-1); // get an open TCC
gEdmaConfigRcv.opt |= EDMA_FMK(OPT,TCC,gRcvChan); // set TCC to gRcvChan
EDMA_config(hEdmaRcv, &gEdmaConfigRcv); // then configure the registers
EDMA_config(hEdmaReloadRcvPing, &gEdmaConfigRcv); // and the reload for Ping
gEdmaConfigRcv.dst = EDMA_DST_OF(gBufferRcvPong); // change the structure to have a destination of Pong
EDMA_config(hEdmaReloadRcvPong, &gEdmaConfigRcv); // and configure the reload for Pong
EDMA_link(hEdmaRcv,hEdmaReloadRcvPong); // link the regs to Pong
EDMA_link(hEdmaReloadRcvPong,hEdmaReloadRcvPing); // link Pong to Ping
EDMA_link(hEdmaReloadRcvPing,hEdmaReloadRcvPong); // and link Ping to Pong
/* Enable interrupts in the EDMA controller */
EDMA_intClear(gXmtChan);
EDMA_intClear(gRcvChan); // clear any possible spurious interrupts
/*
* copyData() - Copy one buffer with length elements to another.
*/
void copyData(Int16 *inbuf, Int16 *outbuf, Int16 length)
{
Int16 i = 0;
for (i = 0; i < length; i++) {
outbuf = inbuf ;
}
}
/* ---------------------- Interrupt Service Routines -------------------- */
/*
* edmaHwi() - Interrupt service routine for the DMA transfer. It is
* triggered when a complete DMA receive frame has been
* transferred. The edmaHwi ISR is inserted into the interrupt
* vector table at compile time through a setting in the DSP/BIOS
* configuration under Scheduling --> HWI --> HWI_INT8. edmaHwi
* uses the DSP/BIOS Dispatcher to save register state and make
* sure the ISR co-exists with other DSP/BIOS functions.
*/
void edmaHwi(void)
{
/* Check CIPR to see which transfer completed */
if (EDMA_intTest(gXmtChan))
{
EDMA_intClear(gXmtChan);
xmtdone = 1;
}
if (EDMA_intTest(gRcvChan))
{
EDMA_intClear(gRcvChan);
rcvdone = 1;
}
/* If both transfers complete, signal processBufferSwi to handle */
if (xmtdone && rcvdone)
{
if (pingOrPong==PING)
{
SWI_or(&processBufferSwi, PING);
pingOrPong = PONG;
} else
{
SWI_or(&processBufferSwi, PONG);
pingOrPong = PING;
}
rcvdone = 0;
xmtdone = 0;
}
}