Re: [spi-devel-general] Re: question on spi_bitbang

[David Brownell]

On Friday 31 March 2006 2:11 pm, Kumar Gala wrote:

> So I give a new question.  Any issue with adding a rx & tx completion  
> to spi_bitbang?

What do you mean?

> In my HW I get an interrupt when the transmitter is   
> done transmitting and one when the receiver is done receiving.  I  
> need some way to synchronize and wait for both events to occur before  
> continuing on in txrx_word().

You can't return from txrx_word() before the RX event, since the
return value is the word that was shifted in.  So if you use IRQs
to synchronize there (rather than polling a status register), all
that would be internal to your code.

- Dave
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