Dear OWFS Developpers First I'm using OWFS for several months now and are generally very satisfied by this nice and useful software - nice job and please carry on! :)
The reason why I write this is in summary that I am confused by the LCD control situation as given by [1] and [2]. Exactly speaking the Maxim and AagElectronica designs. [1] http://owfs.org/index.php?page=lcd [2] http://sourceforge.net/p/owfs/mailman/owfs-developers/thread/45BE3E8F.4040905%40proquariat.de/#msg10970280 I was looking for a supplier (here in Switzerland) for any 1wire LCD. I was able to get a Louis Swart and a LCD Display 163 [3]. Could not find any supplier for other LCD devices - since they are either obsolete, the company does not sell to my region or does not exist anymore. [3] http://www.eservice-online.de/media/pdf/Bedienungsanleitung%20LCD%20Display%20163.pdf (in German) The issue now is; if I look at the Maxim "4bit design" in [2] (see [4]) and compare it to the AagElectronica in [1] and to the EService one [3] (pin assignment table on page 3) they are all the same with respect to the LCD control lines (P0-P4). And according to [1] are "Supported as 29.xxxxxxxxxxxxx/LCD_M/". [4] http://datasheets.maxim-ic.com/en/ds/DS2408.pdf However this does not work (tested it) and must somehow be wrong considering again [1] and the given "Maxim" design schematic [5] "Supported as 29.xxxxxxxxxxxxx/LCD_M/" as well as the Maxim "8bit design" mentioned in [2] and [6]. As mentioned in [6] the Maxim design (LCD_M) must be the 8bit one and is thus NOT the AagElectronica design! This fits with my observations since the EService LCD switches background light which is controlled by the other pins, when trying to write text. [5] http://www.maxim-ic.com/images/appnotes/3286/3286Fig01.pdf [6] http://sourceforge.net/p/owfs/mailman/message/10209248/ So from what I can see the Maxim "Reference" Design "Figure 18. DS2408 AS SLAVE INTERFACE FOR INTELLIGENT DISPLAY" mentioned in [4] page 29 is not implemented in OWFS yet, correct? I would like to request to implement this feature. May be easiest way is to derive from HobbyBoards since this is know to work with 4bits [7] (upper instead of the lower nibble). May be just have a switch to configure which one to use... [7] http://sourceforge.net/p/owfs/mailman/message/31840734/ I am willing to help coding and testing, if someone familiar with the code could guide me. Thanks a lot and Greetings Ursin Solèr
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