MicroPython Forum (Archive)

One possible root cause to consider: what if the wiring from the dev board to the external SD card module can only support a slower SPI bus speed? Using sdcard.py, the default SPI speed is 1.32MHz (Note: the bus speed can now be configured in the constructor with accepted PR https://github.com/micro...

16 and 32 bits are supported

I just ran a read/write test using machine.SDCard, with two SD cards, Class 4 and Class 10. There were no failures or exceptions over 10000 read/write iterations. Hardware: Lolin D32 Pro, running MicroPython v1.18 This does not solve your problem, but at least it confirms that machine.SDCard works w...

I'm trying your code with a more expensive encoder that claims 600 P/R Can you provide a specification reference to the encoder? I am just interested to learn more about the encoder hardware that people are using. Also, how are you using the encoder? e.g. manual turning? other? As OutoftheBOTS indi...

Here is one approach to try: 1. create a new function, create_tone(tone_frequency), that returns a bytearray of samples for the requested tone. The functions would contain the code from lines: https://github.com/miketeachman/micropython-i2s-examples/blob/4f9bdffc54408f7a0efa1b502177154481549eda/exam...

for Pyboard, it it is a string like "X1" Yes, this is the what I haven't figured out. The rotary encoder module requires an integer, but the pyboard pin name is a string. The encoder module documentation example is for ESP32, but the documentation also says that the module was tested with a pyboard...

I am strongly considering that a limitation for using the Teensy audio shield is Fs>=32kHz. The Teensy Audio Library uses a fixed 44.1kHz as documented here. There seems to be no reason for MicroPython I2S to improve upon this limitation.

I found the problem, which also exists in the newer prototype Teensy 4.1 firmware: In the new Teensy prototype firmware, the MCK frequency ("Fmck"), is set based on the sampling frequency ("Fs"). Fmck = Fs * 256. The *256 multiplier is typical for MCK. Previously, Fs was set to a much higher fixed f...

The Teensy 4.0 build was missing the MCK pin definitions. I added them, rebuilt the binary, and committed the updated binary. Hopefully it works now.

I committed a firmware file for the Teensy 4.0. Maybe this will give better results?
https://github.com/miketeachman/micropy ... ree/mimxrt