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List:       comedi
Subject:    Re: comedilib-0.7.12
From:       "Gerard Vermeulen (CRTBT)" <gvermeul () labs ! polycnrs-gre ! fr>
Date:       2000-10-13 8:36:23
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David Schleef wrote:
> > - the 8255 stand-alone driver (for a DAS-8255 card) is broken: at least my
> >   test programs do not work anymore (makes me still stick to 0.7.9/0.7.42).
> 
> I'm looking into this.  What exactly isn't working?
>
The attached program tries all positions on a programmable RF attenuator.
The attenuation is visible by LEDS. Running the program does not toggle
the LEDS. No crashes or hang-ups: it looks like a disconnected cable.
I do not remember to have seen debugging output on dmesg (sorry, but
the experiment is running, I will check if circumstances allow).

Going back to 0.7.9/0.7.42 makes everything work again.

Gerard

-- 
Gerard Vermeulen                           |  TEL: 33 (0)4 76 88 12 53
CRTBT                                      |   or  33 (0)4 76 88 12 61
BP 166 -- 38042 Grenoble Cedex 9 -- France |  Fax: 33 (0)4 76 87 50 60
http://www-crtbt.polycnrs-gre.fr/he3pol
["attenuator.c" (text/plain)]

#include <unistd.h>
#include <comedilib.h>

int main()
{
	char *filename = "/dev/comedi2";
	comedi_t *dev;
	int subdev;
	int n_channels;
	int i, chan;

	dev = comedi_open(filename);

	subdev = comedi_find_subdevice_by_type(dev, COMEDI_SUBD_DIO, 0);
	n_channels = comedi_get_n_channels(dev, subdev);
	printf("DIO subdev %d has %d channels\n", subdev, n_channels);

	/* configure 1 channel of a port is OK */
	comedi_dio_config(dev, subdev, 0, COMEDI_OUTPUT);

	for (i=0; i<256; i++) {
		for (chan=0; chan<8; chan++)
			comedi_dio_write(dev, subdev, chan, (i>>chan) & 1);
		sleep(1);
	}
  
	return 0;
}

/*
 * Local Variables:
 * mode: C
 * c-file-style: "linux"
 * End:
 */


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