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imx6q UART CTS/RTS Issue

Question asked by Angelo Dureghello on Apr 27, 2015
Latest reply on Sep 23, 2015 by Mohammed Azlum

Dear all,

 

i am using a kernel 3.10.17 on a board very similar to sabre-lite board.

I have an HCI/ BT module connected on uart2, that needs flow control.

After reset, the module sends on UART TX (imx6 RX) a train of data, scanning for firmware to be downloaded from bluez hciattach.

 

With pinmux settings for CTS and RTS commented out, i see the burst of data only on imx6 RX, as it should be, and i can upload the firmware successfully. Just after i have issues since the flow control is off.

 

If i enable pinmux ctrl pins for CTS and RTS, i see this burst of data in TX replicated on RX pin, RTS and CTS pins. And due to same train of data also in imx6 TX, i cannot upload the firmware anymore. Why this signal is now on all 4 UART pins ?

Thanks

Angelo

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