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  1.   Trademarks
  2. 1Introduction
  3. 2Pulse Width Modulation (PWM) emulation of a DAC
  4. 3Audio Sampling Rate and Resolution Analysis
    1. 3.1 Using the PWM DAC Method
    2. 3.2 Using Off-Chip DAC
  5. 4Audio File Data Format
    1. 4.1 WAV File Size Calculation
    2. 4.2 Storing WAV Audio on Internal Flash
  6. 5Hardware Setup
    1. 5.1 BOOSTXL-AUDIO BoosterPack Overview
    2. 5.2 Hardware Setup for EK-TM4C1294XL
    3. 5.3 Hardware Setup for EK-TM4C123GXL
    4. 5.4 Hardware Setup for DK-TM4C129x Development Board
  7. 6Application Examples
    1. 6.1 Examples: audio_playback_internal_wavefile_by_PWM_EKTM4C129 and audio_playback_internal_wavefile_by_SPIDAC_EKTM4C129
    2. 6.2 Examples: audio_playback_internal_wavefile_by_PWM_EKTM4C123 and audio_playback_internal_wavefile_by_SPIDAC_EKTM4C123
    3. 6.3 Examples: audio_playback_internal_wavefile_by_PWM and audio_playback_internal_wavefile_by_SPIDAC
    4. 6.4 Examples: audio_playback_with_sdcard_by_PWM and audio_playback_with_sdcard_by_SPIDAC
  8. 7Download and Import the Examples
  9. 8References

6.1 Examples: audio_playback_internal_wavefile_by_PWM_EKTM4C129 and audio_playback_internal_wavefile_by_SPIDAC_EKTM4C129

These two examples demostrates playing a .wav file which is stored internally on the flash memory. Several example .wav files can be selected during compile time by using the #define DEMO directive. To play a different audio file, assign a new value to the macro DEMO. Once a new value is assigned, rebuild the project and the corresponding audio file becomes part of the program image that is ready to be programmed to the flash memory. These two examples are to be run on the EK-TM4C1294XL LaunchPad board. Remember to adjust the DAC SEL jumper on the BOOSTXL-AUDIO BoosterPack to select PWM or SPI DAC when changing between projects. The selected audio will be playbacked repeatedly. Press the USR_SW1 button on the board to pause the playback. Press the USR_SW2 button to resume playback.

Remember to adjust the DAC SEL jumper on the BOOSTXL-AUDIO BoosterPack to select PWM or SPI DAC when changing between projects.

#define DEMO 1

#if DEMO == 1
#include "demo_gettysburg.h"
#define AUDIOSIZE (uint32_t )__gettysburg10_wav_size
#define AUDIODATA __gettysburg10_wav
#endif
#if DEMO == 2
#include "demo_8bit_8kHz.h"
#define AUDIOSIZE (uint32_t )__pcm_mono_8_bit_8kHz_wav_size
#define AUDIODATA __pcm_mono_8_bit_8kHz_wav
#endif
#if DEMO == 3
#include "demo_chirp_16kHz.h"
#define AUDIOSIZE (uint32_t )__chirp_16kHz_wav_size
#define AUDIODATA __chirp_16kHz_wav
#endif
#if DEMO == 4
#include "demo_chirp_8kHz.h"
#define AUDIOSIZE (uint32_t )__chirp_8kHz_wav_size
#define AUDIODATA __chirp_8kHz_wav
#endif
#if DEMO == 5
#include "demo_16bit_8kHz.h"
#define AUDIOSIZE (uint32_t )__pcm_mono_16_bit_8kHz_wav_size
#define AUDIODATA __pcm_mono_16_bit_8kHz_wav
#endif
#if DEMO == 6
#include "demo_8bit_48kHz.h"
#define AUDIOSIZE (uint32_t )__tone_wav_size
#define AUDIODATA __tone_wav
#endif