61 lines
2.1 KiB
C
61 lines
2.1 KiB
C
/*
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* Copyright (C) 2018, Hogeschool Rotterdam, Harry Broeders
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* All rights reserved.
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*/
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#include <stdint.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <NoRTOS.h>
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#include <ti/devices/cc32xx/inc/hw_memmap.h>
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#include <ti/devices/cc32xx/inc/hw_types.h>
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#include <ti/devices/cc32xx/driverlib/prcm.h>
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#include <ti/devices/cc32xx/driverlib/i2s.h>
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#include <ti/drivers/I2C.h>
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#include "ti_drivers_config.h"
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#include "config.h"
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// You can select the sample rate here:
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#define SAMPLINGFREQUENCY 16000
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#if SAMPLINGFREQUENCY < 8000 || SAMPLINGFREQUENCY > 48000 || SAMPLINGFREQUENCY % 4000 != 0
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#error Sampling Frequency must be between 8 kHz and 48 kHz (included) and must be a multiple of 4 kHz.
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#endif
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int main(void)
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{
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// Init CC3220S LAUNCHXL board.
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Board_initGeneral();
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// Prepare to use TI drivers without operating system.
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NoRTOS_start();
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printf("line-in_2_line_out: STEREO LINE IN ==> HP LINE OUT.\n");
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printf("Sampling frequency = %d Hz.\n", SAMPLINGFREQUENCY);
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// Configure an I2C connection which is used to configure the audio codec.
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I2C_Handle i2cHandle = ConfigureI2C(CONFIG_I2C_0, I2C_400kHz);
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// Configure the audio codec.
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ConfigureAudioCodec(i2cHandle, SAMPLINGFREQUENCY);
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// Configure an I2S connection which is use to send/receive samples to/from the codec.
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ConfigureI2S(CONFIG_I2S_0, I2S_BASE, SAMPLINGFREQUENCY);
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while (1)
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{
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unsigned long dataLeft, dataRight;
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// The 16-bit samples are stored in 32-bit variables because the API also supports 24-bit samples.
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I2SDataGet(I2S_BASE, I2S_DATA_LINE_1, &dataLeft);
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int16_t left_sample = dataLeft;
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// You can process the 16-bit left sample here.
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dataLeft = left_sample;
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I2SDataPut(I2S_BASE, I2S_DATA_LINE_0, dataLeft);
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I2SDataGet(I2S_BASE, I2S_DATA_LINE_1, &dataRight);
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int16_t right_sample = dataRight;
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// You can process the 16-bit right sample here.
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dataRight = right_sample;
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I2SDataPut(I2S_BASE, I2S_DATA_LINE_0, dataRight);
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}
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return 0;
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}
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