I2S demo

[中文]

1、Function overview

The I2S demo supports the master sending data and the slave receiving data in different working modes.

2、Code path

demo path: components\bk_cli\cli_i2s.c

For detailed instructions and development guidelines for the i2S module API interface, please refer to the link at the end.

3、Cli command introduction

The commands supported by the demo are as follows:

Command

Description

i2s_master_test {start|stop}

Send data in I2S mode as master

i2s_slave_test {start|stop}

Receive data as a slave in I2S mode

pcm_master_test {start|stop}

Send data in PCM mode as master

pcm_slave_test {start|stop}

Receive data as a slave in PCM mode

dtm_master_test {start|stop}

Send data in DTM+PCM mode as master

dtm_slave_test {start|stop}

Receive data as a slave in DTM+PCM mode

2bd_master_test {start|stop}

Send data in 2B+D mode as master

2bd_slave_test {start|stop}

Receive data as a slave in 2B+D mode

The macro configuration that the demo runs depends on:

Name

Description

File

value

CONFIG_I2S

Configure the I2S function to enable

\middleware\soc\bk7258\bk7258.defconfig

y

CONFIG_I2S_TEST

Whether the configuration demo takes effect

\middleware\soc\bk7258\bk7258.defconfig

y
Demo runs dependent libraries and drivers:

  • GPIO GPIO driver

  • DMA DMA driver

4、Demo introduction

Taking the demo of the I2S working mode as an example, the steps performed by the demo are as follows:

1.Connect two test boards

  • In the use of two development boards for testing, one is used as the master end, and the other is used as the SLAVE side

  • Connect MLK and Sync pin with two boards

  • Connect the Master’s DIN pin with SLAVE DOUT pin pin

  • Connect the Master’s DOUT pin and Slave’s DIN pin

2.Start the slave side test

  • The Uart on the slave side sends the AT command i2s_slave_test start to execute the I2S function test of the slave role

3.Start the master test

  • Uart sends the AT command i2s_master_test start to perform the I2S function test of the master role

4.Stop the test

  • Observe the serial port log printing, and use the logic analyzer to capture the data analysis and analysis. After the test is completed, the slave and master end Uart respectively send AT commands i2s_slave_test stop and i2s_master_test stop to stop executing the I2S function test

5、Detailed configuration and description

Important

Precautions:

    1. Din and DOUT pin connections of MASTER and SLAVE during communication should be correct. Master’s DIN and SLAVE DOUT connection, Master’s DOUT and SLAVE DIN connection;

    1. Master and SLAVE’s working mode should be consistent;

    1. GPIO pins used by I2S do not have other circuits that cause abnormal signals;

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