PORT2 LEDS DO NOT WORK
Applies to: EPM900 LPC Emulator
Information in this article applies to:
I am using the EPM900 and I have written a program that outputs
bit-patterns on port 2. I expected the LED's on the board to blink,
but they did not. What is wrong?
Basically there are two reasons for this problem.
P2 LED Driver is disabled: You must select Enable P2
LED Driver under Project -> Options for Target ->
Debug -> EPM900 Settings. This option enables the
P2.0-P2.7 LEDs (that are driven by a buffer) and show Port 2
The LED driver is disabled by default to avoid oscillation on
open device inputs. You should disable this option when you are
using the P2 pins as input without proper pull-up resistors.
KeilLP.SYS driver is not up-to-date: This file is
installed in Windows/System32/Drivers or
WinNT/System32/Drivers (for Windows 2000). The current
KeilLP.SYS file is Version 1.12 dated 2. Feb. 2003. When you have
an older version, you should download the KeilLP.SYS driver from
the Attached Files section below, and extract the files to
the appropriate Windows drivers folder described above. You need to
reboot your computer after changing the KeilLP.SYS driver file. The
driver update does not work if the EPM900 Emulator/Programmer is
already connected. You must re-start your computer with the EPM900
disconnected before you can update this file.
Article last edited on: 2005-07-22 16:43:56
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