Virtual Com Port

[mvi]

Posted on November 27, 2008 at 11:13

Virtual Com Port

[wmaguire]

Posted on May 17, 2011 at 12:34

Thanks Trevor,

I am using the example in the um0424.zip file. Is this the latest? BTW there is a bug in the code I posted for receiving. this section of code in main.c should be changed from if (localUSARTCount > 0) { spacesLeft = VIRTUAL_COM_PORT_DATA_SIZE - count_in; if (localUSARTCount <= spacesLeft) { for (i=0;i { buffer_in[count_in+i] = USART1RxBuffer[USART1RxReadIndex++]; USART1RxReadIndex &= (USART_RX_BUFFER_SIZE-1); } count_in += localUSARTCount; USART_ITConfig(USART1, USART_IT_RXNE, DISABLE); USART1RxCount -= localUSARTCount; USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); while (_GetEPTxStatus(ENDP1)==EP_TX_VALID); UserToPMABufferCopy(buffer_in, ENDP1_TXADDR, count_in); //intent; send ascii[] to usb packet-memory-area SetEPTxCount(ENDP1, count_in); //intent; tell usb how many bytes to send SetEPTxValid(ENDP1); //intent; enable usb tx endpoint for transmission } } TO if (localUSARTCount > 0) { while (_GetEPTxStatus(ENDP1)==EP_TX_VALID); spacesLeft = VIRTUAL_COM_PORT_DATA_SIZE - count_in; if (localUSARTCount <= spacesLeft) { for (i=0;i { buffer_in[count_in+i] = USART1RxBuffer[USART1RxReadIndex++]; USART1RxReadIndex &= (USART_RX_BUFFER_SIZE-1); } count_in += localUSARTCount; USART_ITConfig(USART1, USART_IT_RXNE, DISABLE); USART1RxCount -= localUSARTCount; USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); UserToPMABufferCopy(buffer_in, ENDP1_TXADDR, count_in); //intent; send ascii[] to usb packet-memory-area SetEPTxCount(ENDP1, count_in); //intent; tell usb how many bytes to send SetEPTxValid(ENDP1); //intent; enable usb tx endpoint for transmission } } Otherwise you can overwrite buffer_in before the USB send is complete. Regards Walt 🙂

[trevor1]

Posted on May 17, 2011 at 12:34

Or use a ''proper'' terminal. Just my opinion but HyperTerminal has many issues which is why I stopped using it many years ago. I use TeraTerm which is much more advanced, can be scripted and is free (and open source). There are of course many other good terminals also.

[janus]

Posted on February 27, 2012 at 20:01

ST Vcom library example / tutorial for Mini STM 32 in Keil

Here is what I did for Vcom in Keil, please see attached file. I wanted very simple but working code. I hope this will be useful to someone, sorry for any mistakes or errors. ________________ Attachments : ForMiniSTM32.doc.pdf : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006HtZR&d=%2Fa%2F0X0000000aRq%2FleGZaEKsFYg3sIwm2s9U7VFU8n3LEuCsw7_Kb1CroYs&asPdf=false