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TMS570LC4357: N2HET Emulated Serial Port

shuo liu
Prodigy 20 points
Part Number: TMS570LC4357


Dear Ti Team

I have read the following post:
https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1504690/tms570ls0432-n2het-emulated-uart

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I may need to use the N2HET1 to emulate three serial ports. Is this feasible? If serial ports are emulated on the N2HET1, can the other HET pins still be operated as regular I/O pins? (Using the gioSetBit function)

  • 0
    TI__Guru 73951 points

    Hi Shuo,

    shuo liu said:
    I may need to use the N2HET1 to emulate three serial ports. Is this feasible?

    No, it is not possible. This is because as mentioned in app note the instruction required for one UART is 21 and available time slots are 60 only, so if we try to use 3 UARTs then the total required instructions will become 63 and available time slots are just 60 and this will break time window and UART might misbahve.

    Here are the couple of options you can try:

    1. Use both HET's N2HET1 and N2HET2. Implement 2 UARTs on N2HET1 and other one UART on N2HET2.

    2. At lower baud rates more instances may become possible.

    shuo liu said:
    If serial ports are emulated on the N2HET1, can the other HET pins still be operated as regular I/O pins? (Using the gioSetBit function)

    Yes, other HET pins still be operated as regular I/O pins. Because GPIO functionality of HET pins doesn't have any dependency over HET program/instructions.

    --
    Thanks & regards,
    Jagadish.