About mete

mete · 2023-11-30

RM0481 says: (I am using STM32H563)USB_ISTR.IDN is the endpoint (or channel in host mode) identification number that generated the interrupt request, and if there are more than one endpoint requesting an interrupt, the lowest (CHEP0R) has a higher pr...

mete · 2023-11-28

Should the USB buffer size of an endpoint be always equal to the max packet size ? Is there a point making it smaller or larger than the packet size ?

mete · 2023-11-21

I am trying to implement a USB 2.0 FS device on STM32H5 without using HAL or anything else. There might be a need to send back a request error (STALL) during enumeration:- and it is OK to return STALL to an IN transaction, so I can set STTX to STALL ...

mete · 2023-11-19

I read RCC RSR to determine the cause of reset. It is not clear to me the purpose of RMVF bit. I guess it resets the other flags but why would I want that ? I wonder if I am missing something.

mete · 2023-11-09

So the startup code first sets the stack pointer, and then jumps to SystemInit for early initialization, then copies the initial values of data and zeroes bss region and then kickstarts C startup. Is there anything hardware related that has to be don...

mete · 2023-11-29

Hi @Sarra.S (first maybe I should say I am working on a USB device implementation, not host, and not using double buffering at the moment)I am looking at RM0481 (working with STM32H563 at the moment). I saw I think the section in RM0433 you mentioned...

mete · 2023-11-21

on a second thought, I guess RX is always set as VALID and TX is set to STALL in any case independent of data transfer direction ?

mete · 2023-11-20

Thanks @STTwo-32 , OK I see, I thought all of them are automatically zero after reset. So basically I have to read the flags then reset them with RMVF after every boot since I am interested in reading the reset reason after every boot. Thanks again.

mete · 2023-11-20

Thanks @STTwo-32 , what I do not understand is why I would want to reset the status of reset flags. Do they not always reflect the reset status after a reset happens ? For what reason would I need to reset it manually using RMVF ?

mete · 2023-11-10

Thanks @Tesla DeLorean for the detailed answer. I understand there wont be a single answer to this, and I should have put a boundary on the system for my question, which would be a single MCU (no external memory) and a C application. In addition to e...

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USB ISTR IDN and USB CHEPxR EA fields

USB endpoint buffer size

how to return STALL to USB OUT transaction and still continue with the next transaction

purpose of RCC_RSR_RMVF

is there a need for early initialization, SystemInit ?

Re: USB endpoint buffer size

Re: how to return STALL to USB OUT transaction and still continue with the next transaction

Re: purpose of RCC_RSR_RMVF

Re: purpose of RCC_RSR_RMVF

Re: is there a need for early initialization, SystemInit ?