F28377D USB-Serial communication (usb_dev_serial)

Hi,

ipyd said:

As far as I understand from the documentation of this example project, I would get an echo from the board.
However, i didn't get anything. 

I hope you followed this procedure:

"Connect USB cables from your PC to both the mini and microUSB connectors on the controlCARD.Figure out what COM ports your controlCARD is enumerating (typically done using Device Manager in Windows) and open a serial terminal to each of with the settings 115200 Baud 8-N-1.  Characters typed in one terminal should be echoed in the other and vice versa."

Regards,

Gautam

Thank you for your reply Gautam, 


Yes, of course I have followed that procedure. 

Below is the while loop in main function of the example code. 

//
// Have we been asked to update the status display?
//
if(g_ui32Flags & COMMAND_STATUS_UPDATE)
{
//
// Clear the command flag
//
IntMasterDisable();
g_ui32Flags &= ~COMMAND_STATUS_UPDATE;
IntMasterEnable();

}

//
// Has there been any transmit traffic since we last checked?
//
if(ui32TxCount != g_ui32UARTTxCount)
{
//
// Take a snapshot of the latest transmit count.
//
ui32TxCount = g_ui32UARTTxCount;

//
// Update the display of bytes transmitted by the UART.
//
usnprintf(pcBuffer, 16, "%d ", ui32TxCount);

//
// Update the RX buffer fullness. Remember that the buffers are
// named relative to the USB whereas the status display is from
// the UART's perspective. The USB's receive buffer is the UART's
// transmit buffer.
//
ui32Fullness = ((USBBufferDataAvailable(&g_sRxBuffer) * 100) /
UART_BUFFER_SIZE);

}

//
// Has there been any receive traffic since we last checked?
//
if(ui32RxCount != g_ui32UARTRxCount)
{
//
// Take a snapshot of the latest receive count.
//
ui32RxCount = g_ui32UARTRxCount;

//
// Update the display of bytes received by the UART.
//
usnprintf(pcBuffer, 16, "%d ", ui32RxCount);

//
// Update the TX buffer fullness. Remember that the buffers are
// named relative to the USB whereas the status display is from
// the UART's perspective. The USB's transmit buffer is the UART's
// receive buffer.
//
ui32Fullness = ((USBBufferDataAvailable(&g_sTxBuffer) * 100) /
UART_BUFFER_SIZE);

}

I have tried to put breakpoints inside all of those if-statement. 
But the program never stopped in it. 

If you have, could you please give me one example line which will continuously send character to PC ? 
I have tried to use UARTCharPut in the while loop, but still I did not receive anything in my PC. 


Thank you. 
Ipyd

Gautam, 

Do you have any idea what I should do with the position of A:JW1 switch ? 

Thank you.

Ipyd

ipyd said:

If you have, could you please give me one example line which will continuously send character to PC ? 
I have tried to use UARTCharPut in the while loop, but still I did not receive anything in my PC.  

Which terminal program are you using? Try hyperterminal from this link:

http://e2e.ti.com/cfs-file.ashx/__key/communityserver-discussions-components-files/171/8154.hypertrm.rar

You've to paste the dll file present in the rar file into your system32 folder:

C:\Windows\System32

Regards,

Gautam

I tried both hyperterminal and Ultra Serial Monitor. 
None of them are working. 

What about the position of switch 2 at A:SW1 ? do I need to make it at ON position or OFF position ? 

Thanks. 

ipyd

ipyd said:

What about the position of switch 2 at A:SW1 ? do I need to make it at ON position or OFF position ? 

Refer this pic:

If your booting from flash : Pos 1 OFF

for USB-to-UART : Pos 2 ON

Regards,

Gautam

Hi ipyd,

I have not ran this example previously but I believe I can help you out some. 

To run the example you will have 2 hyperterminal windows open:
* one which will connect to a virtual USB serial port emulated by the C2000 device and connected via J8.  The interface here is fully USB all the way into the C2000 device.
* one which will connect to a virtual USB serial port emulated by an FTDI device (A:U4) and connected to A:J1.  The interface here is USB to the FTDI chip and then the FTDI will talk to the C2000 device via SCI/UART.

Any message sent via one hyperterminal should then get sent to the other.

With regards to A:SW1:
*position 1 should be in the ON position since you'll be using an emulator
*position 2 should be in the ON position so that the FTDI chip can communicate to the C2000 device over SCI.

Hopefully this helps.


Thank you,
Brett

Brett Larimore said:

To run the example you will have 2 hyperterminal windows open:
* one which will connect to a virtual USB serial port emulated by the C2000 device and connected via J8.  The interface here is fully USB all the way into the C2000 device.
* one which will connect to a virtual USB serial port emulated by an FTDI device (A:U4) and connected to A:J1.  The interface here is USB to the FTDI chip and then the FTDI will talk to the C2000 device via SCI/UART.

Any message sent via one hyperterminal should then get sent to the other.

Hi Brett, thank you for your input. 

Does it mean that my PC should detect two COM ports ? 
Unfortunately, my PC detected only one COM port.

Thanks. 

ipyd

ipyd said:

Does it mean that my PC should detect two COM ports ? 

Exactly! So any yellow alert symbol on any device in Device Manager? Also, do you've 2 usb cables connected to PC as mentioned in comments?

Regards,

Gautam

Hi, Gautam

Gautam Iyer said:

Exactly! So any yellow alert symbol on any device in Device Manager? Also, do you've 2 usb cables connected to PC as mentioned in comments?