BOUNCE rtl@rtlinux.org: Approval required: (fwd)

[Der Herr Hofrat <der.herr@hofr.at>]

>From owner-rtl Sun Jul 15 09:53:36 2001
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Date: Sun, 15 Jul 2001 09:49:30 -0600
From: Victor Yodaiken <yodaiken@fsmlabs.com>
To: rtl@fsmlabs.com
Cc: rtl@rtlinux.org, yodaiken@fsmlabs.com
Subject: Re: [rtl] bug in examples rtc_toggle.c and rtc_toggle_fifo.c
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did you set CONFIG_V1API ?

On Sun, Jul 15, 2001 at 04:53:48AM -0700, Greg Ercolano wrote:
> I was showing my engineering friend the wonders of rtlinux,
> setting it up on his machine, and monitoring the parallel port
> with his scope, when we came across a couple of examples that 
> didn't work, namely:
> 
> 	/usr/rtlinux-3.0/examples/v1api/parallel/rtc_toggle.c
> 	/usr/rtlinux-3.0/examples/v1api/parallel/rtc_toggle_fifo.c
> 
> We found their interrupts only went off once, then stopped.
> 
> For fun we debugged them, and found the problem was just 
> the interrupt handler; wasn't calling 
> I'm guessing these programs were written to use the older
> API which automatically re-enabled the irqs, but when ported
> to the new API, they forgot to add the necessary irq enable.
> 
> To make the examples work, just add the rtl_hard_enable_irq(8)
> call above the 'break' statement for 'case 0' in handler(), eg:
> _________________________________________________________________________
> 
> unsigned int  handler(unsigned int irq_number, struct pt_regs *p) {
>         /* Do not rt_task_wait() in a handler */
>         switch(shutdown_flag){
>                 case 0:
>                         outb(output, LPT_PORT);
>                         /* I'm too lazy to figure out which pin is which
>                            so just toggle all of them */
>                         output = ~output;
>                         (void) CMOS_READ(RTC_REG_C);  /* clear IRQ */
>                         rtf_put(0, &samp, sizeof(samp));
>                         samp++;
>                         rtl_hard_enable_irq(8);         	// <--- ADD THIS LINE
>                         break;
> _________________________________________________________________________
> 
> Once that's added, both examples will work correctly; the scope puts 
> out a nice square wave, and the fifo starts generating data you can 
> view with 'od -x /dev/rtf0'.
> 
> Other examples should likely be checked for this problem.
> 
> HTH..
> 
> ps. I really dig rtl. I've already got an RTL interrupt driver going
>     for a popular 'Kuper Controls' RTMC48 stepper motor card used in the 
>     motion picture effects industry. I'm porting my optical printer 
>     motion control software from DOS to RTL, and it's been a breeze
>     so far.. great work.
> 
> -- 
> 
>    \___/
>    |o,o|
>  \/    )
> ----mm---------------------------------------------------------------------
> Greg Ercolano                    UNIX NightOwl / Systems Programmer & Admin
> erco@3dsite.com                              http://3dsite.com/people/erco/
> ---------------------------------------------------------------------------
> 
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