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Original question:

TMS320F28374S: UPP Rx and Tx switching time

TMS320C6657: How to dynamically switch UPCTL.MODE

O.H
Mastermind 6870 points

Part Number: TMS320C6657

Tool/software:

Hi experts,

Questions about uPP.

Q1: Is it possible to switch RX/TX using UPCTL.MODE during operation?
Q2: If so, is there a recommended order for switching between RX and TX?
Q3: When they actually switch UPCTL.MODE, DMA transfer is triggered. Is this by specification?

My customer is using the configuration shown in the figure below.
Communication is performed in the order DATA_1 → DATA_2 → DATA_3.
DATA_1 and DATA_2 can be communicated without any problems, but for DATA_3, DMA is triggered when switching UPCTL.MODE, and the correct data cannot be sent.

If you have any other workarounds, please let me know.

Best regards,
O.H