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+--- Thread: oled.py plugin (/showthread.php?tid=262)
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RE: oled.py plugin - astrogerard - 2021 Oct 13
(2021 Oct 13, 01:52 AM)paul Wrote: Do you mean I should make i2c_bus_number a modifiable parameter?
No, what I mean is that if two or more plugins use the same i2c bus via different drivers it might endup in a conflict situation.
Sofar this wasn't an issue since all plugins (including mine) use the smbus driver. Adding another/extra driver accessing hardware at the same time is usually not the best idea.
At the moment I have my devPi connected to 5 i2c IO expanders (40 sip stations) and in the coming days will try to add an oled display and see if it works (or not).
--Gerard
RE: oled.py plugin - paul - 2021 Oct 14
I was able to drive two oled devices (SSD1307 and SSD1327) via the same smbus. They have different i2c_write_addr.
I have not tried more than two devices at once.
Nor have I tried two oleds of the same model (ie., identical i2c_write_addr).
Could you provide a link to your devPi development? Looks interesting.
--Paul
RE: oled.py plugin - paul - 2021 Oct 14
Out of curiosity, I add a second SSD1307 OLED (ie., same i2c_write_addr), and the display images were garbled on both devices.
So the plugin would fail if there is an i2c_addr collision.
--Paul
RE: oled.py plugin - astrogerard - 2021 Oct 14
(2021 Oct 14, 12:28 AM)paul Wrote: I was able to drive two oled devices (SSD1307 and SSD1327) via the same smbus. They have different i2c_write_addr.
I have not tried more than two devices at once.
Nor have I tried two oleds of the same model (ie., identical i2c_write_addr).
Could you provide a link to your devPi development? Looks interesting.
--Paul
i2c addresses should be unique so two devices with the same addres will never work since a i2c device sends an ACK (pull sda down) to the host.
At the moment I'm testing my new plugin with 5 IO expanders and 1 ssd1306 LCD. That works flawless so far. The LCD plugin is the one from the SIP plugin repo.
I did test your plugin but had many troubles in getting the luma driver and its zillion dependencies working. I've seen Dan's issues and mine where the same and more so I finally gave up. Also if the installation is such a struggle I doubt if the added value of another LCD plugin is worth it. Future will tell :-)
About my devPi, this is an ordinary Pi with some custom scripts to make development a bit easy. So nothing special there except it is on my bench and not really watering the garden.
--Gerard