how to make micropython lib for nRF52840 SD card function?

[liujirong888]

Dear Expert,

           I use this URL to learn micropython on nRF52840.

https://github.com/micropython/micropython/tree/master/ports/nrf

but I want to use SD card function which don't have micropython lib.

Would you teach me how to develop such SD card micropython lib?

Regards

[Glenn Ruben Bakke]

There is a python module in https://github.com/micropython/micropython/tree/master/drivers/sdcard which makes it possible to use SD card with SPI. Its a bit slower than using QSPI. However, it does the trick. For direct wiring you can take a look at this: https://github.com/micropython/micropython/blob/master/ports/nrf/examples/mountsd.py

Hope this was to some help.

EDIT:

To use the library, move it to the ports/nrf/freeze folder and make it compiled into the hex file by issuing MPY_FROZEN_DIR=freeze in the make command.