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Re: [ts-7000] TS7250 DIO

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Subject: Re: [ts-7000] TS7250 DIO
From: Jim Jackson <>
Date: Mon, 21 Nov 2011 11:48:37 +0000 (GMT)


On Mon, 21 Nov 2011, thoff88 wrote:

> I am fairly new to the ts7250 and I'm trying to control the DIO pins. 
> When I toggle the pins in a for loop nothing happens unless there is a 
> printf() statement within the loop. I am using rtai functions so I can 
> use the real time timer between the loop iterations, yet the pins still 
> only toggle when there is a printf() statement in the loop.
> 
> If anyone has suggestions to what may be causing this it would be very 
> appreciated.

Without code it's like being mystic meg :-)
But probably because you haven't declared your pointers as volatile.
Or not using the correct options in mmap? e.g.

volatile unsigned char * ptr = mmap(0,getpagesize(),PROT_READ|PROT_WRITE, \
         MAP_SHARED,fd,address)



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