Teensy 3.6 SPI Slave

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BenjC

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Hi, I'm new to using Teensy boards and I'm having issues with using Teensy 3.6 as an SPI slave.

I'm using an STM32 as Master and have checked SPI output with a logic analyser to make sure I'm sending the correct data (it's a simple string) and it's working fine.

The problem I have is that although data is being output on the serial monitor for the Teensy board, it only outputs 255.

I'm using the TSPISlave library found here:
https://github.com/tonton81/TSPISlave

I have checked the wiring (MOSI, SCK and CS (I'm not using MISO)) and they're all correct and I have a common ground for the two boards.

For me, it looks like the serial monitor is just displaying the clock.

Any help would really be apprciated.
 
Last edited:
Figured it out, the MISO line needed to be connected on GPIO of both boards even though it's not in use.
 
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