DSP Development System - Digital Signal Processing and Applications with the C6713 and C6416 DSK - page 28

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void c6713_dsk_init() //dsp-peripheral init

{
DSK6713_init(); //BSL to init DSK-EMIF,PLL
hAIC23_handle=DSK6713_AIC23_openCodec(0, &config);//handle to codec
DSK6713_AIC23_setFreq(hAIC23_handle, fs); //set sample rate
MCBSP_config(DSK6713_AIC23_DATAHANDLE,&AIC23CfgData);//32bits interface
MCBSP_start(DSK6713_AIC23_DATAHANDLE,MCBSP_XMIT_START | MCBSP_RCV_START
| MCBSP_SRGR_START | MCBSP_SRGR_FRAMESYNC,220); //start data channel
}

void comm_poll() //comm/init using polling

{

poll = 1; //1 if using polling

c6713_dsk_init(); //init DSP and codec

}

void comm_intr() //for comm/init using interrupt

{
poll = 0; //0 since not polling
IRQ_globalDisable(); //disable interrupts
c6713_dsk_init(); //init DSP and codec
CODECEventId=MCBSP_getXmtEventId(DSK6713_AIC23_codecdatahandle);//Xmit
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IRQ_setVecs(vectors); //point to the IRQ vector

IRQ_map(CODECEventId, 11); //map McBSP1 Xmit to INT11

IRQ_reset(CODECEventId); //reset codec INT 11

IRQ_globalEnable(); //globally enable interrupts

IRQ_nmiEnable(); //enable NMI interrupt

IRQ_enable(CODECEventId); //enable CODEC eventXmit INT11

output_sample(0); //start McBSP interrup out a sample

}

void output_sample(int out_data) //out to Left and Right channels
{
short CHANNEL_data;
AIC_data.uint=0; //clear data structure
AIC_data.uint=out_data; //32-bit data -->data structure
...
if(poll) while(!MCBSP_xrdy(DSK6713_AIC23_DATAHANDLE));//ready to Xmit?
MCBSP_write(DSK6713_AIC23_DATAHANDLE,AIC_data.uint);//write data
}

void output_left_sample(short out_data) //for output->left channel
{
AIC_data.uint=0; //clear data structure
AIC_data.channel[LEFT]=out_data; //data->Left channel->data structure
if(poll) while(!MCBSP_xrdy(DSK6713_AIC23_DATAHANDLE));//ready to Xmit?
MCBSP_write(DSK6713_AIC23_DATAHANDLE,AIC_data.uint);//out->leftchannel
}

void output_right_sample(short out_data) //for output->right channel
...
Uint32 input_sample() //for 32-bit input
{
short CHANNEL_data;
FIGURE 1.14. Partial listing of communication/initialization support program
( C6713dskinit.c ).
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