I am considering buying a 4D Systems I2C LCD for the BBB, e.g. a 7" touchscreen, which uses the I2C2 bus.
The question is, will I be able to use other peripherals on I2C2, on a home made cape, alongside the LCD ?
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1\$\begingroup\$ A quick read of the datasheet from your link may have the answers you need. Start at section 3.7 and refer to the schematic. \$\endgroup\$ – Roger Rowland Jun 22 '17 at 11:54
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\$\begingroup\$ Whether the LCD uses the I2C bus does not tell if in practice, it allows enough bandwidth for a user application. Can you find this information in the datasheet ? \$\endgroup\$ – dplamp Jun 22 '17 at 13:07
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Ask 4D, or the 4D forum.
However, it looks to me that the I2C bus is used only for an on-board EEProm interface. Probably to store/read setup and user data. I would guess that there's plenty of bandwidth left over on the bus for you to use.
Do be aware that this board has the pull-ups already installed for this bus, so be careful about adding more pull-ups elsewhere. See the "ID EEPROM" section of the schematic in the datasheet, Page 8.
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What about this one? It's from Newhaven Display and it's more inexpensive than the one you're looking at. http://www.mouser.com/new/newhavendisplay/newhaven-beaglebone-cape/
