audio.c

基本回音程式,可以改变parameter来测试其速度和音响。

#include "audio.h"

/* MCBSP1 configuration settings */
MCBSP_Config audioCntlCfg = {
    0x1000,        /*  Serial Port Control Register 1   */
    0x0200,        /*  Serial Port Control Register 2   */
    0x0000,        /*  Receive Control Register 1   */
    0x0000,        /*  Receive Control Register 2   */
    0x0040,        /*  Transmit Control Register 1   */
    0x0001,        /*  Transmit Control Register 2   */
    0x0063,        /*  Sample Rate Generator Register 1   */
    0x2000,        /*  Sample Rate Generator Register 2   */
    0x0000,        /*  Multichannel Control Register 1   */
    0x0000,        /*  Multichannel Control Register 2   */
    0x0a0a,        /*  Pin Control Register   */
    0x0000,        /*  Receive Channel Enable Register Partition A   */
    0x0000,        /*  Receive Channel Enable Register Partition B   */
    0x0000,        /*  Receive Channel Enable Register Partition C   */
    0x0000,        /*  Receive Channel Enable Register Partition D   */
    0x0000,        /*  Receive Channel Enable Register Partition E   */
    0x0000,        /*  Receive Channel Enable Register Partition F   */
    0x0000,        /*  Receive Channel Enable Register Partition G   */
    0x0000,        /*  Receive Channel Enable Register Partition H   */
    0x0000,        /*  Transmit Channel Enable Register Partition A   */
    0x0000,        /*  Transmit Channel Enable Register Partition B   */
    0x0000,        /*  Transmit Channel Enable Register Partition C   */
    0x0000,        /*  Transmit Channel Enable Register Partition D   */
    0x0000,        /*  Transmit Channel Enable Register Partition E   */
    0x0000,        /*  Transmit Channel Enable Register Partition F   */
    0x0000,        /*  Transmit Channel Enable Register Partition G   */
    0x0000         /*  Transmit Channel Enable Register Partition H   */
};

/* MCBSP2 configuration settings - 16 bits */
MCBSP_Config audioDataCfg = {
    0x0000,        /*  Serial Port Control Register 1   */
    0x0200,        /*  Serial Port Control Register 2   */
    0x0140,        /*  Receive Control Register 1   */
    0x0000,        /*  Receive Control Register 2   */
    0x0140,        /*  Transmit Control Register 1   */
    0x0000,        /*  Transmit Control Register 2   */
    0x0000,        /*  Sample Rate Generator Register 1   */
    0x0000,        /*  Sample Rate Generator Register 2   */
    0x0000,        /*  Multichannel Control Register 1   */
    0x0000,        /*  Multichannel Control Register 2   */
    0x0003,        /*  Pin Control Register   */
    0x0000,        /*  Receive Channel Enable Register Partition A   */
    0x0000,        /*  Receive Channel Enable Register Partition B   */
    0x0000,        /*  Receive Channel Enable Register Partition C   */
    0x0000,        /*  Receive Channel Enable Register Partition D   */
    0x0000,        /*  Receive Channel Enable Register Partition E   */
    0x0000,        /*  Receive Channel Enable Register Partition F   */
    0x0000,        /*  Receive Channel Enable Register Partition G   */
    0x0000,        /*  Receive Channel Enable Register Partition H   */
    0x0000,        /*  Transmit Channel Enable Register Partition A   */
    0x0000,        /*  Transmit Channel Enable Register Partition B   */
    0x0000,        /*  Transmit Channel Enable Register Partition C   */
    0x0000,        /*  Transmit Channel Enable Register Partition D   */
    0x0000,        /*  Transmit Channel Enable Register Partition E   */
    0x0000,        /*  Transmit Channel Enable Register Partition F   */
    0x0000,        /*  Transmit Channel Enable Register Partition G   */
    0x0000         /*  Transmit Channel Enable Register Partition H   */
};

CODEC_Config codecCfg = {
	0x0017,
	0x0017, 
	0x00f9,
	0x00f9,
	0x0010,
 	0x0000,
	0x0000,
	0x0043,
	0x0001,
	0x0001
};

/*Joshuatok*/
/*-----------------------------------------------------------------*/
/* handles to the McBSP ports */
MCBSP_Handle hAudio_cntl;
MCBSP_Handle hAudio_data;


/* configure the audio control and data interface */
void audio_setup(void)
{   
	/* open the McBSP ports */
	hAudio_cntl = MCBSP_open(MCBSP_PORT1, MCBSP_OPEN_RESET);
	hAudio_data = MCBSP_open(MCBSP_PORT2, MCBSP_OPEN_RESET);
   
   MCBSP_config(hAudio_cntl, &audioCntlCfg);
   MCBSP_config(hAudio_data, &audioDataCfg);

	MCBSP_start(hAudio_cntl, MCBSP_XMIT_START 
		| MCBSP_SRGR_START | MCBSP_SRGR_FRAMESYNC, 100);

	audio_reset();

   	return;
}

/* reset the audio codec */
void audio_reset(void)
{
	Uint16 regnum, regval;
	/* reset the codec */
	regnum = 15;
	regval = 0;
	while(!MCBSP_xrdy(hAudio_cntl));
	MCBSP_write16(hAudio_cntl, (regnum<<9) | regval);

	/* cofigure the codec */
	for (regnum=0; regnum<10; regnum++){
		while(!MCBSP_xrdy(hAudio_cntl));
		regval = codecCfg.regs[regnum] & 0x1ff;
		MCBSP_write16(hAudio_cntl, (regnum<<9) | regval);
	}
	
	/* clear any data in DRR */
	if (MCBSP_rrdy(hAudio_data)){
		MCBSP_read16(hAudio_data);
	}
}

/* start the audio codec to receive and transmit samples */
void audio_start(void)
{
	/* start codec */
	MCBSP_start(hAudio_data, MCBSP_XMIT_START | MCBSP_RCV_START
		| MCBSP_SRGR_START | MCBSP_SRGR_FRAMESYNC, 220);
}
/*Joshuatok*/