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TMS570LS1227: How to detect whether there is a device connected to the SCI port?

f zl
Prodigy 90 points
Part Number: TMS570LS1227

Hi, I need to detect whether there is a device connected to the SCI port.

The datasheet said SCI has a register SCIFLR, and its BRKDT bit is for SCIRX break-detect. In my experiment, that bit was not set on a device disconnection. Is there a way to detect whether there is a device connected to the SCI port (other than a heartbeat packet)?

  • 0
    TI__Guru**** 196306 points

    Hi,

    The BRKDT bit is set when the SCI detects a break condition on the SCIRX pin. A break condition occurs when the SCIRX pin remains continuously low for at least 10 bits after a missing first stop bit, that is, after a framing error.

    How long did you force your SCIRX pin low? You should receive a FE, then receive a BRKDT after 10 bit times.