Compact Flash operation by interrupts

  I am trying to implement a non-blocking driver for the CF card. So, 
this driver has to operate by CF interrupt rather then by polling the 
registers. So far so good, however one problem remains:
Is it possible to generate the interrupt when the write sector operation 
is complete, i.e. when the CF is ready for the next sector write?

VLV

Vladimir Vassilevsky wrote:
> 
>  I am trying to implement a non-blocking driver for the CF card. So, 
> this driver has to operate by CF interrupt rather then by polling the 
> registers. So far so good, however one problem remains:
> Is it possible to generate the interrupt when the write sector operation 
> is complete, i.e. when the CF is ready for the next sector write?

Without knowing more details, I *can* say that I have
successfully used the CF READY line as an interrupt
mechanism, which (iirc) mirrors the ready status that
you are polling.


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Michael N. Moran wrote:

>>  I am trying to implement a non-blocking driver for the CF card. So, 
>> this driver has to operate by CF interrupt rather then by polling the 
>> registers.
> 
> Without knowing more details, I *can* say that I have
> successfully used the CF READY line as an interrupt
> mechanism, which (iirc) mirrors the ready status that
> you are polling.

Yes, you are right. I had to discover it myself; the documentation is 
rather poor and often misleading. The IRQ is active by the raising 
front. In the default configuration, on the sector write operation the 
IRQ is generated twice: once after the "write sector" command is issued, 
indicating that the CF is ready to accept the data, and the second time 
after the actual write operation is complete.


Vladimir Vassilevsky

DSP and Mixed Signal Design Consultant

http://www.abvolt.com