STM32F4Discovery VCP Problem

[naceur2311]

Posted on April 18, 2013 at 18:44

Hello,

I want to test

http://www.mediafire.com/?0ghzhc6jgn90u4k

of VCP on STM32F4 Discovery board.But in building the project the following error occurs.warning: implicit declaration of function 'VCP_dataTx' is invalid in C99Can any one help me.Thank you.

[Tesla DeLorean]

Posted on April 18, 2013 at 19:41

VCP_DataTx() would need to be something other than 'static' to be referenced outside of usbd_cdc_vcp.c, like in main.c

You're building this under what environment?

[naceur2311]

Posted on April 18, 2013 at 23:27

I tried to declare the function without ''static'' but the same error persist. I'm building the project under Keil uVision 4. You can download it from the link above.

Thank you.

[Tesla DeLorean]

Posted on April 19, 2013 at 00:32

Yeah, figured that out.

Just needed to add a prototype in main.c, and remove the static from usbd_cdc_vcp.c for it to compile. Build target 'STM32F4_VCP' compiling main.c... compiling usbd_cdc_vcp.c... linking... Program Size: Code=17200 RO-data=548 RW-data=404 ZI-data=4796   ''.\Debug\STM32F4_VCP.axf'' - 0 Error(s), 0 Warning(s).

[naceur2311]

Posted on April 19, 2013 at 16:51

Yeah, there are no error now. But i don't understand the redirection of printf() function to the Hyperterminal. And i'm not used to work with µVision and i have a doubt about the configuration of th µVision project. Can any oneverify it.

Thank you.

[Tesla DeLorean]

Posted on April 19, 2013 at 18:43

Firmware, works and provides a virtual serial port, which is retargeted by Keil to use stdio. Uses the V1.3 x64 VCP Driver

Talking to the board via terminal application:

Virtual COM Printf Example: retarget the C library printf function to the USB
> Unknown Command
> help Command
> Command s
> Command t
> Command l
>