Hello, I'm having some troubles sending data from my SAMD21g18a master to Arduino uno (slave). This is my master code: #include "sam.h" #include "t/Core.h" #define BUFFER_SIZE 32 #define SPI_CLK_FREQ 8000000 #define SPI_BAUD 50000 void init_SPI_tutorial(){ while(SERCOM1->SPI.SYNCBUSY.bit.ENAB…

First the hardware: a SAMD21 runs on 3.3V while the UNO runs on 5V. Your wiring might work (given very short connections) for SCKL, CS and MOSI but the MISO connection probably damages the SAMD21. You should use level converters for all these signals! Additionally the SPI frequency of 8MHz is too …

Arduino Uno as SPI slave

Projects Networking, Protocols, and Devices

pylon October 15, 2021, 5:42pm 7

Do you use level converters between the UNO and the SAMD21? If you don't you probably damaged the SAMD21 board already as it isn't 5V tolerant and you now fired with 3 5V pins at it.

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Arduino Uno as SPI slave

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