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Limited number of arguments in some modules of DSP/BIOS

beaver
Intellectual 575 points

How to pass more parameters to the DSP/BIOS module, such as SWI thread.  There are only two arguments.  e.g., How to deal with 4 parameters?

  • 0
    TI__Mastermind 18130 points

    Most BIOS modules are written with a limited (arbitrary?) number of possible arguments as this had to be decided and hard-coded into the kernel; however, there are some other modules such as the MBX (mailbox) or QUE (Queue) objects which can alleviate this limitation. A QUE object is a FIFO into which you essentially pass a pointer to a buffer. Whenever another piece of code retrieves an object it pulls the oldest QUE element from the FIFO and passes it to that function. This would allow you to essentially pass extra arguments to a function, but it requires some careful architecting in your code.

    You can take a look at the BIOS API guide for more information about how to code the use of these objects.

  • 0 in reply to TimHarron
    TI__Mastermind 24340 points

    Just adding to Tim's answer, you can pass a pointer to a structure as an argument, this way you just use one argument and can point to a structure that can fit the amount of arguments that you need.