Re: problem s usb-cdc v stm32

[Vojtěch Petrucha]

Diky obema, pristi tyden se tu student objevi, tak na to mkneme a dam pak vedet.
V.P.
 
 
______________________________________________________________
> Od: Jan Waclawek <konfera na efton.sk>
> Komu: HW-news <hw-list na list.hw.cz>
> Datum: 21.02.2018 16:21
> Předmět: Re: problem s usb-cdc v stm32
>
No ale to by sa nevylepsilo delayom v USBD_SetClassConfig(), ktory je
 volany z USBD_SetConfig(), tj. z funkcie, ktora prave spracovava
 SET_CONFIGURATION.. inaksie povedane, device ten  SET_CONFIGURATION
 ocividne prijme, ale k PC sa odpoved dostane, len ked sa oneskori... alebo
 je tam nejake komplikovanejsia suvislost.
 
 V tom USBD_SetClassConfig() sa vola inicializacia specificka pre to CDC, ak
 je to rovnake, ako example v Cube, tak USBD_CDC_Init(), v ktorom sa vola
 otvaranie jednotlilvych endpointov, volanie inicializacie suvisiaceho
 hardwaru (typicky USARTov) a tiez je tam ten nestastny malloc. Co z toho
 moze sposobit to, ze device neodpovie, netusim.
 
 Kazdopadne by som vsak doporucil namiesto nariekania normalne debuggovacie
 postupy, t.j. zistit, co sa stane ked sa ten connect nepodari (napr. ci
 nezostane cely mcu visiet v fault handleri alebo v nejakom cykle, alebo
 nejakom preruseni apod.,) a samozrejme skusit prekrokovat tu kriticku
 funkciu (toto mozno nebude viest k cielu, vid "delay pomaha"), pripadne
 robit rozne pomocne vypisy/blikanie atd. na sledovanie cesty programu.
 
 wek
 
 
 
 
 
 ----- Original Message ---------------
 
 Subject: Re: problem s usb-cdc v stm32
   From: Tomas Dresler <dresler na hw.cz>
   Date: Wed, 21 Feb 2018 14:42:59 +0100
     To: HW-news <hw-list na list.hw.cz>
 
 >Dobry den,
 >
 >nesouvisi to s tim, jestli aktivujete D+ rezistor jeste pred 
 >inicializaci knihovny nebo hodin? To by si host myslel, ze uz jste 
 >pripraveny k enumeraci a zatim by STM32 jeste startovala...
 >
 >Tomas
 >
 >
 >On 2018-02-21 13:50, Vojtěch Petrucha wrote:
 >> Zdravim,
 >> netusite prosim nekdo co by mohlo stat za problemem popsanym
 >> zde: https://community.st.com/message/183355 <https://community.st.com/message/183355>    (text z odkazu
 >> nize...)
 >> Dotaz psal pred casem na forum muj student, ja mu nedokazu poradit
 >> jelikoz tu nemam ted ten HW..   pouziva Cube..   cast zapojeni
 >> zde: https://ibb.co/chc8DH <https://ibb.co/chc8DH>
 >> Diky
 >> V.P.
 >>  
 >>  
 >> --------------------------------------------
 >>  
 >> USB - SET_CONFIGURATION fails
 >>  
 >>  
 >> Hello,
 >> I have encountered a problem with my STM32L452VE - when I set up USB
 >> with CDC, it sometimes connects, sometimes not. When it doesn't
 >> connect, Windows clasically show yellow exclamation mark.
 >>  
 >> Increasing heap size and chaning packets size didn't solve this issue.
 >>  
 >> I have tried sniffing USB communication and problem seems to be the
 >> same every time - SET_CONFIGURATION is sent from host (PC) but no
 >> response is received. Upon closer inspection, I tried to modify HAL
 >> libraries by adding an extra delay, which miraculously solved the
 >> issue and now it succusefully connects every time.
 >>  
 >> As this this fix appears to be highly temporary, does anyone know the
 >> root of the issue?
 >>  
 >>  
 >>  
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