How to define call back function in USB interrupt?

Vu.Andy · ‎2016-08-09

Posted on August 10, 2016 at 02:16

I am new to the USB libraries so this question may seems obvious. I've worked on I2C and USART which has a user defined callback function so one can decide what to do when there is an interrupt like when receiving data.

For the USB interrupt routine, how does one define the user callback function.

For example, the library interrupt routines are:

HAL_HCD_IRQHandler()

HAL_PCD_IRQHandler()

USBD_OTG_ISR_Handler()

But these are general calls. How does the user get to decide what to do based on the given interrupt? For example, if the USB receives data from the PC, how does the user know what to do?

Thanks.

Walid FTITI_O · ‎2016-08-11

Posted on August 11, 2016 at 13:35

Hi vu.andy,

I recommend to give a look to the USB user manuals

http://www.st.com/content/ccc/resource/technical/document/user_manual/b8/5a/28/c2/cf/b6/47/d6/DM00105256.pdf/files/DM00105256.pdf/jcr:content/translations/en.DM00105256.pdf

and

http://www.st.com/content/ccc/resource/technical/document/user_manual/cf/38/e5/b5/dd/1d/4c/09/DM00108129.pdf/files/DM00108129.pdf/jcr:content/translations/en.DM00108129.pdf

and find the available callback functions, their definitions and which one useful for you USB class type.

-Hannibal-