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Matteo Pezzoli
Matteo Pezzoli
Associate II
May 18, 2017
Question

SPWF04S python over SPI

  • May 18, 2017
  • 1 reply
  • 923 views
Posted on May 18, 2017 at 15:35

Hi,

I have one question about the SPWF04S module python capabilities. Looking at the 'console_active' configuration variable, it seems that the python functionalities can be used only with the UART. Given that the command 'AT+S.PYTHON' has its SPI equivalent though, i would say that scripts can be launched via SPI, and the only thing that needs an UART to function is the REPL; is this correct?

Thank you

#spwf04sa
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    1 reply

    Gerardo GALLUCCI
    Gerardo GALLUCCI
    ST Employee
    May 18, 2017
    Posted on May 18, 2017 at 15:52

    Ciao Matteo,

    console_enabled (not console_active ) can be set from 0 to 3:

    • 0 and 1 -> interface is SPI or UART only. You cannot run AT+S.PYTHON, since REPL mode is intended only for UART;

    • 2 -> this is the UART+REPL mode. You can enter REPL (AT+S.PYTHON), or run a script (AT+S.PYTHON=script.py);

    • 3 -> interfaces are disabled over UART/SPI pins

    Once inside the python REPL, or while executing a python script, we can use different and dedicated UART/SPI peripherals, over GPIOs alternate functions. Moreover, you can find I2C, ADC, DAC & PWM classes.

    Summary:

    • Python is only available when

      console_

      enabled

      >=2

    • REPL is only available when

      console_

      enabled

      ==2

    • SPWF04S pins for communication interface (UART or SPI) are not GPIOs

    • Python peripherals (UART and SPI and others) are GPIOs (0 to 18)

    Matteo Pezzoli
    Matteo PezzoliAuthor
    Associate II
    May 19, 2017
    Posted on May 19, 2017 at 08:56

    Ciao Gerardo,

    Thank you again. Do you know if there are any plans (even if not short-term) to implement python via SPI or the bus is just not fit for this application?

    Gerardo GALLUCCI
    Gerardo GALLUCCI
    ST Employee
    May 19, 2017
    Posted on May 19, 2017 at 09:54

    Ciao Matteo,

    if with 'python via SPI' you mean 'REPL over SPI', no, there are no plans for some reasons:

    • REPL needs to be a plug&play. No protocols, headers, clocks, other. Just, plug in the board, and press some keys with your PC keyboard;
    • REPL I think will be never used in production. Your final product will never use the REPL. It's only a debug aid. Once  the script is completed/debugged, console_enabled will be set to 3

    In a few works: there is no console_enabled meaning SPI+REPL mode

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