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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