On 6/14/06, Nelson Castillo <nelsoneci@xxxxxxxxx> wrote:
Hi. I'm trying to run the example "short" of LDD3. It doesn't work with the parallel port. The parallel port is ok, and the circuit for testing is ok. I run a counter in user-space and it works[1]. If I enable the interrupts and I set the line 10 to 1 (using the output of the data7 bit, see [2]) then it generates the interrupts (I verified using /proc/interrupts). The problem is that when I try to run the example, I have to unload the module parport_pc, and then I can hook the interrupt handler of the example of LDD, but somehow I cannot write to it. I tried to make the simplest code that would work, but it does not. Note that when I unload module parport_pc, the kernel logs the following message: pnp: Device 00:07 disabled. So it might be the problem. I have Linux 2.6.16 (Debian). What should I try? This is the code I tested: http://svn.arhuaco.org/svn/src/linux/examples/modules/parallel/par.c I expect the initialization function to set the output bits to 1 but nothing happens. (from /proc/interrupts) 7: 0 0 IO-APIC-edge par The lines outb(0x10,par_base+2); outb(0xFF,par_base); In the following snippet of code don't work. What should I do? I need to use an interrupt for a training course. I could also use User Mode LInux but I don't know how[3]. Not yet. I'd like to use the real parallel port.
try using outb_p(). i think it can handle slow ports. -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
