Multiple devices on SPI buss RA8875 Tri-Sate issue

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Keith_M

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I know there is an issue with Tri-stating on the SPI buss with RA8875 displays ..

the question I have is if you have 2 devices on the SPI buss that have their own CS lines ...
Is the tri-state problem still there ?

or is the SPI Buss corrupted due to conflict with the state of the RA8875 when the other SPI device is selected?

Thanks .. need some schooling here

Keith
 
Tri-state is not a CS issue unless you have both CS' asserted. The issue is at MISO, some chips don't tri-state that line and it fights with the other slave that is ran in parallel. tri-state buffers exist for these problems
 
Thankyou for the reply .. I'm struggling with the Ra8876 display which is 7.84" 1280 X 400 pixels and requires SPI for 2 chips on the board SSD2828 is the bridge chip from SDI to MIPI and needs to be set to allow the the passthrough for the ra8876 ... I've tried the forked version ra8876teensylite library which bit banged the other connection but its not working ...So trying to see what can be done..Thanks for the info
 
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