STM32F427ZI USB

[gmotta]

Posted on May 28, 2014 at 20:27

Hello again Gentlemen!

I would like to download some sample code to help me to program the USB peripheral to use it as a Virtual COM port. I guess on the PC side I have to install the ST Micro Virtual COM port driver, right?!

If believe that ST has sample code for this but I could not find it.

Thanks,

Gil

#lmgtfy:-stm32-resources

[Tesla DeLorean]

Posted on May 28, 2014 at 20:52

http://www.st.com/web/en/catalog/tools/PF257882

Red DOWNLOAD button, bottom of page.

[gmotta]

Posted on May 29, 2014 at 23:46

I downloaded the code and I was able to build it without error. I see the LEDs working fine and I see Win 7 recognizes my board as a VCP and assigned COM17 to it. I can open port 17 with Putty.

Now I'm trying to figure out how to send data from the board to Putty but it is not working.

In app.c I have the following code in the main loop every 3 seconds:

        USART_SendData(EVAL_COM1, 'U');

        USART_SendData(EVAL_COM1, 'S');

        USART_SendData(EVAL_COM1, 'B');

        USART_SendData(EVAL_COM1, '\r');

        USART_SendData(EVAL_COM1, '\n');

Nothing on Putty not even garbage. Would you be able to help out?

I set a breakpoint inside of EVAL_COM_IRQHandler and the processor never landed there.

Thanks much,

Gil

[Tesla DeLorean]

Posted on May 30, 2014 at 00:33

You must spin on the USART status waiting for TXE, you can't keep jamming the SendData

[gmotta]

Posted on May 30, 2014 at 03:00

Thanks for your help, maybe I was not clear about what I was trying to do. The sample code you pointed to me is designed to work as a bridge between the uart on the eval board and the USB Host.

I was actually trying to send something to the host from within the code itself like a debug trace.

so I found out to transmit to the host you need to do the following:

  APP_Rx_Buffer[APP_Rx_ptr_in] = character;

  APP_Rx_ptr_in++;

Now I'm seeing my debug traces on Putty!

I appreciate your help, you saved me many days of work!

[gmotta]

Posted on May 30, 2014 at 03:00

Cheers!