DAC play TF card PCM data demo

[中文]

1、Function overview

Read the specified PCM music file from TF card and play it through DAC.

2、Code path

demo path: \components\demos\media\audio\aud_intf\demo\aud_intf_demo.c

For the detailed description of the Aud_Intf API interface, please refer to the same webpage: /api-reference/multi_media/bk_aud_intf.html

3、Cli command introduction

The commands supported by the demo are as follows:

Command

Description

aud_intf_play_test {init|start|pause|stop|deinit} xx.pcm

Play xx.pcm file

The macro configuration that the demo runs depends on:

Name

Description

File

value

CONFIG_AUDIO

Configure the audio function

\middleware\soc\bk7256\bk7256.defconfig

y

CONFIG_AUDIO_RISCV_IP_V1_0

Configure audio ip

\middleware\soc\bk7256\bk7256.defconfig

y

CONFIG_AUD_INTF

Configure aud_intf enable

\middleware\soc\bk7256\bk7256.defconfig

y

CONFIG_AUD_INTF_TEST

Configure demo enable

\middleware\soc\bk7256\bk7256.defconfig

y

CONFIG_AUDIO_TRANSFER

Configuring Voice Transmission Enable

\middleware\soc\bk7256\bk7256.defconfig

y

CONFIG_AUD_TRAS_MODE_CPU0

Configure Voice Transmission Mode

\middleware\soc\bk7256\bk7256.defconfig

y
Demo runs dependent libraries and drivers:

  • DMA DMA driver

  • AUD audio module driver

  • SD SDcard and file system driver

4、Demo introduction

The steps performed by the demo are as follows:

1.Store the PCM audio file to be played in the TF card

  • Copy the pcm format file to the TF card, and change the Chinese character file name to pinyin or number

2.Mount TF card

  • Uart sends AT command fatfstest M 1 to mount TF card

3.ready to play

  • Uart sends AT command aud_intf_play_test init xx.pcm to initialize playback

4.Start playing

  • Uart sends AT command aud_intf_play_test start xx.pcm to start playing

5.Pause playback

  • Uart sends AT command aud_intf_play_test pause xx.pcm to pause playback

6.Resume playback

  • Uart sends AT command aud_intf_play_test start xx.pcm to resume playback

7.Stop play

  • Uart sends AT command aud_intf_play_test stop xx.pcm to stop playing

8.end playback

  • Uart sends AT command aud_intf_play_test deinit xx.pcm to end playback, close the pcm file, and log out of the playback path

Execute the test command, the workflow of the case is shown in the following figure:

tf_pcm_to_dac demo software flow

Figure 1. tf pcm to dac demo flow chart

5、Detailed configuration and description

Note

  • 1.The audio file name needs to be changed to character type, Chinese characters are invalid;

  • 2.The current demo sets the DAC sampling rate to 8K.