/*****************************************************************************/
/* Codec.c
/*
/* Digital Loopback example
/*
/*****************************************************************************/
#include
#include
#include
#include
/*****************************************************************************/
/* Function Prototypes
/*****************************************************************************/
/* This delay routine does not conflict with DSP/BIOS. It is used in this */
/* example rather than brd_delay_msec which causes DSP/BIOS conflicts just */
/* because of this. If you are not using DSP/BIOS, you can change the code */
/* to use brd_delay_msec. */
void delay(s16 period);
/*****************************************************************************/
/* Global Variables */
/*****************************************************************************/
HANDLE hHandset;
s16 data;
/*****************************************************************************/
/* MAIN
/*****************************************************************************/
void main()
{
s16 cnt=2;
if (brd_init(100))
return;
/* blink the leds a couple times */
while ( cnt-- )
{
brd_led_toggle(BRD_LED0);
/* brd_delay_msec(1000); */
delay(1000);
brd_led_toggle(BRD_LED1);
/* brd_delay_msec(1000); */
delay(1000);
brd_led_toggle(BRD_LED2);
/* brd_delay_msec(1000); */
delay(1000);
}
/* Open Handset Codec */
hHandset = codec_open(HANDSET_CODEC); /* Acquire handle to codec */
/* Set codec parameters */
codec_dac_mode(hHandset, CODEC_DAC_15BIT); /* DAC in 15-bit mode */
codec_adc_mode(hHandset, CODEC_ADC_15BIT); /* ADC in 15-bit mode */
codec_ain_gain(hHandset, CODEC_AIN_6dB); /* 6dB gain on analog input to ADC */
codec_aout_gain(hHandset, CODEC_AOUT_MINUS_6dB); /* -6dB gain on analog output from DAC */
codec_sample_rate(hHandset,SR_16000); /* 16KHz sampling rate */
/* Polling and digital loopback */
while (1)
{
/* Wait for sample from handset */
while (!MCBSP_RRDY(HANDSET_CODEC)) {};
/* Read sample from and write back to handset codec */
data = *(volatile u16*)DRR1_ADDR(HANDSET_CODEC);
*(volatile u16*)DXR1_ADDR(HANDSET_CODEC) = data;
}
return;
}
void delay(s16 period)
{
int i, j;
for(i=0; i {
for(j=0; j>1; j++);
}
}
