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DM3725: Regarding interrupt on CTS

Abhinav
Expert 1065 points
Part Number: DM3725

Hi,

I am implementing eHCILL protocol on DM3725 for BT which is having wilink-8 chip.
Now I want to understand that If I want interrupt of the CTS pin of UART-2 then what is the procedure for that ?
If I configure CTS pin into GPIO and then try configuring interrupt on this pin then what can be the procedure.
What is the main difference between above two scenario

Regards,
Abhi

  • 0
    TI__Guru 65405 points
    Hi Abhi,

    It is not necessary to configure the CTS pin as GPIO to receive interrupts because in this case it could not be used as uart2_cts.
    You should use a GPIO multiplexed on the uart2_cts pin can be used to capture the events. The whole procedure is described in the AM/DM37x Multimedia Device Technical Reference Manual section 19.3.2.3 Wake-up Request at:
    www.ti.com/.../technicaldocuments
    Also check section 19.3.2.1 Interrupts.

    BR
    Tsvetolin Shulev
  • 0 in reply to Cvetolin Shulev-XID
    Expert 1065 points

    Hi Tsvetolin Shulev,

    Thanks for the information.
    I have gone through the sections which you have mentioned in above comment.
    I understood few of the points but looking at the implementation perspective have no idea how to start.
    Need some more direction from your side.

    In section 19.3.2.3 there is small window named "Caution" and in that para it is mentioned that "See Chapter 25, General-Purpose Interface, for a full description of this mechanism ".
    Can you tell me which section I have to look at for my implementation.

    Secondly, if I don't want to use this gpio multiplexed on the uart2_cts pin instead just want to use interrupt on uart_cts pin.Then what is the procedure for that and what will be disadvantages of using the later over former.

    Regards,
    Abhi