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Hardware flow (RTS/CTS) on AUARTs on i.MX28 not working.

Question asked by Hector Palacios on Dec 14, 2012
Latest reply on Nov 22, 2013 by seth bollinger

Hello,

 

I'm trying to communicate from an MX28 AUART port (as transmitter) to another target (as receiver) at baudrates of 115200 or higher (230400, 576000) with hardware flow control, but it doesn't seem to work. It works for some time but at some point, after receiving a stop signal from the receiver (RTS deasserted on receiver side) the MX28 stops sending forever, no matter if the receiver tells him to resume sending (RTS asserted back on receiver side).

 

I have backported some patches from mainline (like 00592021010ad86d3b26bac7034034f6af145a2c) but it still fails.

 

Has anybody verified RTS/CTS hardware flow control on the AUART against a different target (this could be another MX28 too, but not another port on the same target). Kernel version 2.6.35. Driver mxs-auart.c.

Thanks

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Héctor

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