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Modify XINTF to parallel interface 8080 on F28335

Ludovic Krafft
Prodigy 50 points
Other Parts Discussed in Thread: TMS320F28335, CONTROLSUITE

Hello,

I need to drive a component from a TMS320F28335 with a 16bit parallel interface 8080.
I read all of the XINTF Reference Guide but i can't determine if it can be use like that. I only found one configuration to determine the length of the data bus 16 or 32 bits and all others for timing.
The idea is to modify the XINTF interface such as :

- Use only 16 bit data bus,

- Use XWE0 as Write Enable,

- Use XRD as Read Enable,

- Use and other bus like XA0/XWE1 or XZCSx as Data/nCmd bus.

- Let free all other GPIO, especially the address bus,

Is it possible do modify the XINTF interface enough to obtain this kind of interface?

Thank for the answer !

  • 0
    Guru 192875 points

    Hi,

    Is that even possible? Anyways never heard of such a thing. 

    Regards,

    Gautam

  • 0
    Guru 20525 points

    Hello!

    Perhaps this example will be useful

    ti\controlSUITE\device_support\f2833x\v133\DSP2833x_examples_ccsv4\xintf_run_from\

    Regards,

    Igor

  • 0 in reply to Gautam Iyer
    Prodigy 50 points

    Hi,

    Actually, I based the parallel interface on an API using GPIOs, because there is no parallel interface on the TMS320.
    The problems come from the frequency of the interface (about 30kHz) and the consumption ( about 10 to 15mA).
    I would like to improve the interface, especially to decrease CPU time used to manage the interface.

    The baud rate is two times higher than SPI baud rate, so using a  transceiver is not a good idea.

    It's why I'm trying to modify XINTF interface, but it takes a lot of GPIOs unused for the application.
    I'll look the example too !



    Regards,

    Ludovic