On Tue, May 06, 2008 at 04:53:42PM -0400, maray@xxxxxxxxxxxxxxxxxxxx wrote: | > Hi, | > | > I am trying to use the parport interrupt (pin 10) on a RT_PREEMPT Linux | > Kernel. I am using the parport_pc module to register a custom driver | > that synchronize the clocks using an external clock generator, by | > sending a signal to the parport interrupt pin 10 (ACK). With kernel | > 2.4.24 i have no problems on using the interface that the parport_pc | > driver offers me. But, as my userspace applications needs RT, i've | > installed the RT_PREEMPT patches, and my driver is not working now. The | > attach function of my driver is: | [...] | > | > This should be enough to register my driver with the parint_handler | > function as the "callback" when the IRQ (7) ocurrs. In summary, i am | > registering the device, the callback, enabling the IRQ at the control | > register (0x10), and enabling the IRQ in the parport_driver. | | Ok. It seems to work for very limnited time quantums. Maybe the interrupt | handler thread IRQ7 should have a higher priority, but i dont know how to | do this... :S You can change the source to start the thread with right prio (although that may be tricky to make sure which thread is that) or correlate data from 'ps' and /proc/interrupts to find the right process and use chrt on it. If it is always [IRQ-7] you are looking for, the lines below should be enough: chrt -p 80 `ps -Ao pid,cmd | grep "\[IRQ-7\]"| cut -f2 -d\ ` Here, 80 is the priority. Luis | > I've change the IRQ flags to IRQF_NODElAY in the parport driver, | > and I've write also a module without using the parport_pc, | > and still the interrupt denies to works. | | -- | To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in | the body of a message to majordomo@xxxxxxxxxxxxxxx | More majordomo info at http://vger.kernel.org/majordomo-info.html ---end quoted text--- -- [ Luis Claudio R. Goncalves Bass - Gospel - RT ] [ Fingerprint: 4FDD B8C4 3C59 34BD 8BE9 2696 7203 D980 A448 C8F8 ] -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
