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entetegebe
entetegebe
Associate
July 28, 2016
Question

FNSOF value in Keil windows

  • July 28, 2016
  • 1 reply
  • 665 views
Posted on July 28, 2016 at 09:27

Hello guys,

im currently playing with stm32f4 usb audio, and cant understand FS_DSTS frame number (FNSOF) values i see on Keil. Basically i read value of hardcoded register address in program and it gives me certain  value, which differs from what i see in Peripherals/System Viewer window, and, also, if i check value in Memory window, it differs from both these as well. Any ideas why im getting this wrong?

#keil #!stm32f4 #!usb
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1 reply

entetegebe
entetegebeAuthor
Associate
July 28, 2016
Posted on July 28, 2016 at 20:02

I think i probably found it, must be this line from ref. manual

OTG_FS device status register (OTG_FS_DSTS)

''This register indicates the status of the core with respect to USB-related events. It must be read on interrupts from the device all interrupts (OTG_FS_DAINT) register.''

I guess it means i can only get correct FNSOF value under certain circumstances.
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