On Tue, Jul 24, 2001 at 09:41:53PM +0200, Julien wrote:
> Now I'd like to use interrupts, but it doesnot work. I put
> "irq=auto", but select() never comes back. I can read data using
> read(), and I can read as many data as I want there is no problem.
> I have a logic analyzer, and there should be an IRQ because
> PeriphClk (nAck) goes low to initiate the transfer. How can I enable
> them ? I saw functions in the parport-lowlevel.txt so can I do it
> through ppdev or is that made automatically ?
When you do a PPCLAIM ioctl, interrupts are turned on, so it ought to
work. Do the numbers go up in /proc/interrupts?
> When the interrupts will be enabled, will the FIFO be used ? Can I
> set up the interrupt to occur only when the FIFO is full ?
The FIFO will be used if you have compiled the kernel with
CONFIG_PARPORT_PC_FIFO enabled, told parport_pc which interrupt to use
with irq=X (or 'auto'), not passed dma=nofifo, AND parport_pc has
detected hardware that it can use.
At user level, you don't get to know about interrupts caused by FIFO
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