Detailed Manuel to USB_Device_Examples

[j-fischer-gundlach]

Posted on April 12, 2012 at 10:13

Hello there,

i have downloaded the ''STM32_USB-Host-Device_Lib_V2.1.0'' library, installed the VCP driver and the VCP USB_Device_Example works on the MCBSTM32C board ''out-of-the-box''. Great thing at this point! As i thought, the example is more complicate than the one´s for the ADC, i have worked previous with. So i wanted to ask if there is a more detailed manual, wich explains how the components in the example work together(wich source fullfill wich aim). Otherwise i would have to do a lot of reverse engeneering to get how the things work behind the scenes for adapting it to my own project. best regards, Justus

[j-fischer-gundlach]

Posted on April 12, 2012 at 11:44

Ok, i found something, wich looks to be the correct one.

UM1021 is the usermanuel to explain, what goes on in the library.

[j-fischer-gundlach]

Posted on April 13, 2012 at 14:47 Hey, there is one important thing left, i can´t really figure out: In the basic VCP example, the received data are passed to the USART=>TX of the processor, and from the USART=> RX to the IN of the Endpoint. I can´t find out, in wich file this happens. What i found is on page 28 of the UM1021,

''The applicatoin has also to use the general USB ISR and speceific EP1 subroutines when the USB_OTG_HS_DEDICATED_EP1_ENABLED define is uncommented in the usb_conf.h file.''

But in wich file do i find these ''

speceific EP1 subroutines'' and if the define can be out- or in- commented where do i pick up or send the data in each case?

Greetings, Justus

[jlchoobs]

Posted on April 20, 2012 at 10:55

I am analyzing the Code myself on the MSC.

But, I saw your answer when I analyzed the related USB CDC Example: Look for cdc_DataTx() and cdc_DataRx() functions in the file: usbd_cdc.C - The cdc_DataRx() calls the cdc_DataTx() to echo data back as default. I had to modify these funcs in my Example Project in:

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