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I had the buzzing sound on headphones too after wiring everything together on the breadboard. My setup added another SPI device in addition to the audio board by directly translating the 3.3v signals to 5v signals using a 74hct125 (quad buffer ic). I noticed two things: -) The buzzing was less...

Thank you for the hint. SPI is (still ;)) working as expected and the output looks very good (via oscilloscope). Amazingly, switching the MISO pin inside a transaction and reverting it back afterwards is no problem for teensy. I'm impressed. Finally I have one last question: I've seen that the...

That's exactly what i want to do. I'd just like to read and write a bunch of input and output shift registers simultaneously at a reliable 8MHz speed (i am also using a voltage level shifter that adds a small delay to all signals) using MISO and MOSI pins about every millisecond. I have tested...

beginTransaction and endTransactions are a good point, but I can't find any confirmation this won't mess up the audio libraries interrupts if called directly. Calling beginTransaction inside the loop function should disable the audio libraries software interrupt completely, but as far as i see...

Hi! As far as i've seen, the audio library accesses the SD-card in an "update"-function, which is called inside an interrupt routine (I guess). Accessing the SD-Card therefore utilizes the SPI Hardware. Is it possible to Play wav-files from SD Card with the Audio Adapter Board on teensy 3.2...