User`s guide

LPC3250 Developer’s Kit - User’s Guide

Page 34

Select the desired COM port number under the Advanced settings dialog. NXP’s FLASH Utility

program (for ISP program download) needs, for example, a COM port number between 1 and 5. Often

the COM port number is selected but the USB Serial Port is higher than that and needs to be changed

manually.

It is common that all COM ports with low numbers are listed as occupied, but try to change to a low

number anyway. Very often it is no problem at all to do so.

Figure 13 – Advanced USB Serial Port Properties Dialog

Finally it is time to test if you have successfully installed and configured the USB Serial Port. Start a

terminal program. Connect to the correct COM port, with 115200 bits per second, 8N1, no flow control.

5.2.1 USB Driver Behavior

Sometimes the USB COM port does not enumerate properly when the board is connected to the PC.

This is a known “feature” of the USB driver. If you experience this problem, just unplug the board

shortly and then plug it in again. A new COM port that can be accessed properly should be created the

second time.

This problem may occur after every time you start (i.e., power cycle) your PC.

5.3 Building Sample Applications

A bundle with sample applications is available at Embedded Artists’ support site. These applications

illustrate the use of different peripherals on both the LPC3250 OEM Board and the QVGA Base Board.

The sample applications have been developed using the Common Driver Library (CDL) framework

developed by NXP.

The CDL framework contains start-up code, initialization of clocks and drivers for the peripherals on

the microcontroller. The file structure, see figure below, is organized in a way where chip specific code

is separated from board specific code and the structure also supports using different build environment

such as CodeSourcery’s GNU tools or Keil’s uVision.

COM Port

Number Setting