[ECOS] serial line ISR problem -- again:(

[Piotr Trojanek]

On Wed, Sep 10, 2003 at 10:17:06AM +0100, Robert Cragie wrote:
> It would help if you post truly representative code, i.e the most basic set
> which exhibits the problems. Anything else confuses the issue considerably.

you're right, so here it goes...

the output from my program is:
iid = 0x00, c = 0
msr = 0x88, c = 0
iid = 0x00, c = 0
msr = 0x08, c = 0
... [this loops forever, and this sequence takes about 1 second
(DCD is high for 0.2 second), which coresponds to signal I can see
on osciloscope and my test LED diode]

as you can see, I read Interrupt Identification Register (iid) in UART, and
when it says there is a pending interrupt (iid = 0x00, which also means
that it was interrupt was caused by change on input signal lines) I
simoply reads modem status register to reenable interrupts from UART.

values 0x08 and 0x88 coresponds to signal change on DCD line.

so, there is a proof, that my hardware works fine and exactly as I
expect. all works just fine in polling mode.

now I need to make it works in interrupt mode, but my ISR is not executed
by ECOS. under both Linux and FreeBSD COM1 works fine under IRQ4.

-- 
Piotr Trojanek
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