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Arduino SPI Wiring
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Arduino SPI Wiring

by rsstansbury on Tue Feb 18, 2020 11:59 am

Hello,
I have a PCB with 3 standalone ATMEGA2560 micro controllers. I am currently using a serial communication architecture between them. Each controller has its own isolated SPI header for programming. I want to change to Master/Slave SPI communication for passing data. All 3 microcontrollers are powered when any of the 3 are being programmed. Will there be any problems with programming the two slaves if with their SS pin is tied to both the programming header and master output pin? In other words, a conflict caused by the programmer trying to pull the slave pin low while the master is trying pull it high at the same time.

Thank you,

rsstansbury
 
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Joined: Sat Jan 21, 2017 2:51 pm

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