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Thread: Access to all 3 I2S modules on Teensy 4.0

  1. #1
    Junior Member
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    Sep 2016
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    Access to all 3 I2S modules on Teensy 4.0

    Hi,
    A quick questions. I see from the user manual of the NXP chip used on the Teensy4 that it actually has 3 I2S modules. The specs for the Teensy 4.0 states only 2 I2S are broken out. I assume that if desired the MCU internal mux can be re-programmed to allow access to all three I2S modules?

    Would be helpful if this where confirmed.
    Many thanks
    Aidan

  2. #2
    Senior Member PaulStoffregen's Avatar
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    Nov 2012
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    Quote Originally Posted by aidyw View Post
    I assume that if desired the MCU internal mux can be re-programmed to allow access to all three I2S modules?
    Nope, that would be a wrong assumption.

    Only 2 are available. The published specs are correct. If 3 could be used somehow, we'd certainly want to publish that in the Teensy 4.0 specs.

    Many very difficult trade-offs had to be made in assigning the pins to be accessible. Much of that decision process is on this forum, in the beta test thread and an older thread specifically about choosing the pins. The 3rd I2S port was considered less important than several other features, like the native SD card pins, a 2nd SPI port, and CAN FD.

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