Please correct me, if I make a mistake. But, why don't you use/register a kernel timer to make what you want ? Raghu R. Arur (rra2002@cs.columbia.edu) wrote: > > instead of changing the timer interrupt why dont u use timer_bh or > immediate_bh bottom halves of timer interrupt. i mean u can register ur > code to be executed every timer interrupt if u register to these bottom > halves. > > hth, > raghu > > > On Thu, 2 Jan 2003, Geert Fannes wrote: > > > hello, > > > > i am working on a drivermodule to control a stepper motor using the > > parallel port. i need a timer mechanism with a higher frequency than the > > jiffies clock. i tried to register an interrupt handler for IRQ0, but > > the code > > > > request_irq(0,stepper_isr,SA_SHIRQ,"stepper",&iNothing) > > > > fails and returns -16 (16 == EBUSY, 12 == ENOMEM, 22 == EINVAL, so i > > guess that the "-" characters in `man request_irq` in the return value > > section are really minus signs, and not some item indicators. i mean: > > can i interpret "-16" as being EBUSY?). i tried also using the flags > > SA_INTERRUPT|SA_SHIRQ, but it gave the same result, so i gues the timer > > interrupt cannot be shared using request_irq(). > > > > - can anyone tell me what i am doing wrong? > > - or how i can get my interrupt service routine called at each IRQ0 (i > > played a bit with writing interrupt handler in dos using assembler, but > > i don't know if i can do the same things in protected mode. if i > > remember correct, the isr for irq0 can be found at addres 0x0000 till > > 0x0003, so can i just replace this with my isr and call the original > > linux timer isr at the end of my isr)? > > - (or where i can find the linux timer interrupt handler in the source > > so i can extend this (last option))? > > > > (i run the latest mandrake and/or the latest debian) > > > > greetings and happy newyear, > > geert. -- Regards/Cordialement Christophe -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
