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Reply to a new post on the Read-Only thread, http://www.keil.com/forum/21035/
Ramesh goud > am working on IAR evalution board (LPC2148) for USB virtual com. The sample code from keil is not working in this board.
Did you really try it? I believe the CDC example (Keil\ARM\Boards\Keil\MCB2140\RL\USB\Device\CDC\) works on the IAR board without any change.
Here is the schematics of both boards,
Keil MCB2140 http://www.keil.com/mcb2140/mcb2140-schematics.pdf
IAR LPC2148 Development board old.iar.com/.../LPC2148-board-schematic.pdf
To run the CDC example, - Both boards mount a 12MHz crystal - MCU VBUS pin (P0.23) connects to VBUS pin of the USB connector over resistors. - DB9 connector on UART1 (COM1 / RS232_1)
The difference is just USB_CONNECT (P0.31) pin. MCB2140 doesn't use USB_CONNECT, but IAR board requires it. The example code enables USB_CONNECT function in USBD_Init(), usbd_LPC214x.c.
In these observations, I believe the Keil CDC example works on the IAR board as it is.
Tsuneo
Dear Tsuneo, let me know how to overcome the last issue, i.e. plugging and unplugging of USB cable.
What I mean to say that after resetting the board we need to disconnet the comport before only. if not it's asking once again the drivers to update. after updating the driver for effective functionality it's asking to restart the PC.
pls let me know.....