About MStea.1

MStea.1 · 2021-12-14

The ADCs I'm logging data from occasionally shut off and then come back on and start streaming data. When this happens, the USB seems to have entered a sleep state as the write time for the packet header goes from taking ~20 milliseconds to taking up...

MStea.1 · 2021-05-26

I'm using a nucleo-f7 development board as the basis for a data logger. The logger is using three spi slaves with DMA to grab data streaming from a sensor suite and write it to a USB flash drive with occasional data headers. The problem I'm having ...

MStea.1 · 2021-01-20

I'm using a Nucleo F746ZGThe SPI is setup in RX only slave mode and uses DMA Double buffer mode. The data rate changes, but at max I should be writing right at 126 kBytes per second to the drive. I'm using fatfs and USB driver with the cubemxide sou...

MStea.1 · 2021-12-15

Do you now how to tell the host NOT to use selective suspend in CUBE or in the usb host .c/.h file?

MStea.1 · 2021-01-20

Correct, the USB is acting as a mass storage host.

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Does the USB as a mass storage device enter a sleep state? if so, how do i prevent this?

How to improve random long write times using USB flash drive and fatfs

I'm working on a data logger. It intakes data with three SPI RX only slaves using DMA double buffer mode. It works fine except occasionally the f_write, which usually takes ~150 ms, takes ~1850 ms. Does anyone know why and if it's avoidable?

Re: Does the USB as a mass storage device enter a sleep state? if so, how do i prevent this?

Re: I'm working on a data logger. It intakes data with three SPI RX only slaves using DMA double buffer mode. It works fine except occasionally the f_write, which usually takes ~150 ms, takes ~1850 ms. Does anyone know why and if it's avoidable?