Hardware requirements

  • Mini/micro USB cable

  • MIMXRT1040-EVK board

  • Headphone(OMTP standard)

  • Personal Computer

Board settings

  • J34, headphone connected

  • Uninstall jumper J35,J36,J37,J41 and connect FLEXIO pins to the pad close to U25 as follows:

Pin Name   Board Location     Pin Name    Board Location
RX_DATA    SW2-1              RX_DATA     U25-16
TX_DATA    SW2-2              TX_DATA     U25-14
SYNC       SW2-3              SYNC        U25-13
BCLK       SW2-4              BCLK        U25-12

Prepare the Demo

  1. Connect a USB cable between the host PC and the OpenSDA USB port on the target board.

  2. Open a serial terminal with the following settings:

    • 115200 baud rate

    • 8 data bits

    • No parity

    • One stop bit

    • No flow control

  3. Download the program to the target board.

  4. Either press the reset button on your board or launch the debugger in your IDE to begin running the example.

Running the demo

Note: This demo uses both headphone mic and board main mic(P1) as input source. The headphone mic provides left channel data, and main mic (P1) provides right channel data. If users found there is noise while do record operation, most probably it is the headphone standard issue (OMTP and CTIA standard difference). You should use the OMTP standard headphone. You can disable the left channel by using an headphone without microphone feature.


When the demo runs successfully, the log would be seen on the OpenSDA terminal like as below.

~~~~~~~~~~~~~~~~~~~~~
FLEXIO I2S EDMA example started!

FLEXIO I2S EDMA example finished!
~~~~~~~~~~~~~~~~~~~~~

Note:
This example's right/left channel data is swapped due to the buffer maintain issue. This issue will be fixed in later release.