Originally shared by Drew Fustini (pdp7)
BeagleBone folks: any tips for this person on @Adafruit_Industries forum looking to use four MAX31855 sensors over SPI?
https://forums.adafruit.com/viewtopic.php?f=49&t=89597&p=451431#p451431
Each SPI port has two chip selects. If the devices support chip selects, you should be able to connect 4. If you need to try to use one port, you could use GPIOs for chip selects, but you’ll need to be careful in your coordination with the SPI driver. The SPI driver may or may not understand using GPIOs for chip select and I’d need to defer to someone more familiar with the SPI Linux driver.
@Jason_Kridner is SPI0_CS1 available? The SPI diagram doesn’t show it and couldn’t find it in the SRM. an old post by @Andrew_Bradford indicated it isn’t accessible:
https://groups.google.com/d/msg/beagleboard/12EWHeDjW1I/1pTFGHdugY4J
“I think only a single CS pin is available (I need to look
again at the muxing…)”
@Andrew_Bradford thanks
What is the difference between P9-19 & P9-42???