topic Re: USB Host MSD Fatfs FreeRTOS Example Problems in Kinetis Microcontrollers

USB Host MSD Fatfs FreeRTOS Example Problems

Microfelix — Sat, 20 Nov 2021 15:50:59 GMT

hi, i am using K66 and freertos sdk 2.10.0.
I am working on USB with fatfs and freertos. During the development of my project I realized that every now and then the reading of a USB file fails.
So I created a routine that continuously reads a file and after several reads it goes into error giving "DISK_ERROR"

Help me

Maurizio

Re: USB Host MSD Fatfs FreeRTOS Example Problems

Microfelix — Sun, 21 Nov 2021 08:48:01 GMT

what I noticed from the tests is that this kind of error occurs if I insert other "ENET lwip" work tasks in the project.
As soon as this task is activated, errors become very frequent.
While if, I disable it, there are + no errors and it completes many readings

Maurizio

Re: USB Host MSD Fatfs FreeRTOS Example Problems

bobpaddock — Mon, 22 Nov 2021 18:04:01 GMT

USB can be Interrupt intense.
Could lwip be disabling IRQs too long?

Re: USB Host MSD Fatfs FreeRTOS Example Problems

Microfelix — Tue, 23 Nov 2021 08:02:37 GMT

I thought about this. In fact I tried to change the IRQ values. I changed the priorities of the usb which was originally 6. I took it to a lower level and nothing has changed. I tried to raise it a lot, and it seems to be doing better but it still goes wrong.

Is there any other way to fix?
Is it possible that while you are working the usb, the other interrupts go to the queue?

Maurizio

Re: USB Host MSD Fatfs FreeRTOS Example Problems

Microfelix — Tue, 23 Nov 2021 16:14:18 GMT

hi,
it seems that the problem occurs more frequently when I have large files.
With small files the problem is not there.

Any solution?

Maurizio