I.MX6 UART3 RTS/CTS

[patrickauffray]

Dear Sirs,

I've just finished a new design using I.MX6Q, i've connected UART3 to WL18xx module with the following pinout :

- EIM_D24 (TXD) connected to WL18xx RX

- EIM_D25 (RXD) connected to WL18xx TX

- EIM_D30 (configured as CTS_B) connected to WL18xx RTS

- EIM_D31 (configured as RTS_B) connected to WL18xx CTS

After reading user manual, i noticed that RTS in DCE mode is seen as an input as must be connected to WL18xx RTS and vice and versa. But with yocto, i can also configure EIM_D30 as RTS_B and EIM_D31 as CTS_B (MX6QDL_PAD_EIM_D31__UART3_CTS_B & MX6QDL_PAD_EIM_D30__UART3_RTS_B) but it does not work anymore.

Is there a way to invert by software both pins without modifying TX & RX ?

Best regards,

Patrick.

[igorpadykov · Accepted solution]

Hi patrick

inverting is not possible, as for configure EIM_D30 as RTS_B

and EIM_D31 as CTS_B, I would suggest to look more closely at RM:

Best regards

igor

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[patrickauffray]

Thank you Igor, i'm going to try HW change in this case.