Wonderful, I'll apply the patch. I think you are the first to report on
using OWFS with the DS2780.
By the way, if you have a picture or schematic of your thermocouple, I'd
like to post it on the website.
Paul Alfille
On Wed, Jan 20, 2010 at 1:20 AM, <[email protected]> wrote:
> Hi folks,
>
> I was able to find a DS2780 on eBay, and decided to have a go at making my
> own thermocouple reader. great fun.
>
> Anyhow, after soldering the tiny TSSOP onto a breakout board, i was afraid
> i'd zapped it!
>
> The temperature reading was constantly 0. Other functions worked, voltage,
> PIO, etc.
>
> I sucked down the memory, and was able to look at the datasheet and figure
> that 0x0A and 0x0B held the temperature. To my delight, the temperature was
> there and seemed accurate!
>
> OWFS still returned it as 0 though.
>
> I scanned through the code and found the problem. There's a typo which is
> making the DS2780 use the memory offset for the DS2760.
>
> here's a patch. Tested and working. This is against owfs-2.7p27, btw.
>
> Cheers, and thanks for a great package.
>
> -tmk
>
> --- broken/module/owlib/src/c/ow_2760.c 2010-01-19 22:11:16.000000000
> -0800
> +++ module/owlib/src/c/ow_2760.c 2010-01-19 22:05:04.000000000 -0800
> @@ -832,7 +832,7 @@
> switch (pn->sn[0]) {
> case 0x32: //DS2780
> case 0x3D: //DS2781
> - off = _1W_DS2760_TEMPERATURE;
> + off = _1W_DS2780_TEMPERATURE;
> break;
> default:
> off = _1W_DS2760_TEMPERATURE;
>
>
>
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attendees to learn about information security's most important issues through
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