Re: [Paparazzi-devel] spi call back function

[Gautier Hattenberger]

Hi Chris,

It is possible to change the callback function during the execution, but 
you should be aware that this function is called under interrupt (and 
before the slave got unselected), so it should really be used only if 
necessary.
If you plan to use it to handle the data, you should use a "normal" 
event function and look the spi transaction status (Success of Failed).
Have a look at max1168 and ms2100 drivers in sw/airborne/peripherals

Gautier

Le 03/07/2013 10:38, Chris a écrit :
> Hi.
> Felix can i change the spi "after_cb" function during code execution 
> so i can call different
> functions or after the spi transaction initialization the call back 
> function should remain fixed
> the whole time?
> I am writting a module and if i got this right the "after_cb" function 
> is really used as the "event"
> function which is commonly used for the modules.
>
> max7456_trans.after_cb  = max7456_trans_cb;
>
> where the function's prototype called back is defined like this:
> static void max7456_trans_cb(struct spi_transaction *trans);
>
> and the function definition has the "__attribute__ ((unused))" attribute:
> static void max7456_trans_cb(struct spi_transaction *trans 
> __attribute__ ((unused))){
>
> return;
> }
>
> Chris
>
>
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