MicroPython Forum (Archive)

Nice. Maybe if you give us some sort of step by step guide we could include it in the documentation at least? @Robert-hh what do you think?

We use 50MHz 4bit parallel interface with USDHC. Which should be hard to match with SPI. The peripheral supports even more if you have a certain card but I have not yet implemented these modes in the driver.

Please forgive my ignorance but would there be any use-case for lower sampling frequencies? Isn’t 44.1kHz the most used sampling frequency as it is used with CDs?

Especially since a flash file system should distribute the writes over the whole available memory range to increase flash lifetime.

So I would assume that sometimes it works flawlessly and sometimes it crashes miserably, taking the file system down with it.

The virtual file system is located from 1 MB upwards. Hence you are missing 7MB on your Teensy4.0 but your program does not know about it (it is a bit less due to the reserved area at the end of flash memory on the teensy devices - but to keep it simple you are missing 7MB). When you are loading fil...

You are welcome. Maybe to elaborate a bit more. The uSHDC peripheral does not support SPI mode. The machine.SDCard driver is configured to use 4bit SD high speed mode with 50MHz. That should give you superior performance in comparison to the SPI driver. If you can not use it however there is no othe...

Since my Teensy 4.0 doesn't have an SD card slot, I used the one on the Teensy audio adapter. However, I wasn't able to get the machine.SDCard class to work. Maybe my syntax is incorrect. Is it implemented for an external SD card? Hi @rdagger. The machine.SDCard works with the uSDHC peripheral of t...

Ok sorry - my bad.

The B revision strikes again. We already discovered that with the 1050s. I guess I will make a note to check the layout and add it to our boards. There are maybe more differences in the pinout.

If I understand correctly Mike you own a B revision 1060 board?

That is correct but I believe that a driver for an external IC is different. Supporting MCU specific features like you the ones you mentioned is of course important for the mimxrt port