USB MSD external flash memory

rd1 — Thu, 11 Feb 2021 07:29:11 GMT

Hello, i'm developing using the board LPCXpresso55s69

I was looking at the usb_msc_ramdisk example and i was wondering if it was possible to open an external flash memory connected to the micro through a SPI interface instead of the internal micro memory.

Is it possible? Cause i can't find the exact point in the example to change for switching to the external memory

Re: USB MSD external flash memory

diego_charles — Tue, 16 Feb 2021 21:00:11 GMT

Hi @rd1

I hope you are doing well!

If I understand properly in your application you require to storage from a non-volatile memory (external flash) , instead of using the SRAM of the LPC55.

You could take a look at the USB_DeviceMscCallback , this function handles the read and write events for this class.

It may also be useful to take a look an example like the dev_msc_sdcard_bm that implements an SD memory as a reference.

topic USB MSD external flash memory in LPC Microcontrollers

USB MSD external flash memory

Re: USB MSD external flash memory