NXP Semiconductors
UM11079
IoT Module base board
UM11079_OM40006.docm
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User manual
Rev. 1.0
— March 20, 2018
13 of 23
the IDE boots the debug probe. The debug probe is booted once a debug session is
started (i.e. the IDE attempts to download code to the target).
4.1 What the Link2 boot LED indicates
LED D8 is the Link2 MCU BOOT0_LED indicator. This LED reflects the state of Link2
MCU pin P1_1. When the boot process fails, D8 will toggle at a 1 Hz rate for 60
seconds. After 60 seconds, the Link2 MCU is reset.
4.2 Programming the Link2 firmware
As mentioned earlier in this section, it is not normally necessary to program the Link2
firmware. However, this can easily be accomplished using the supporting utility,
LPCScrypt.
To program the Link2 Flash the Link2 device (LPC432x) must be in DFU mode. If the
Link2 already has a valid image in the flash, it will need to be forced into DFU mode by
placing a jumper shunt on JP5, and power cycling (disconnecting then reconnecting
power via J8.) Link2 MCU programming is performed using the LPCScrypt utility (see
http://www.nxp.com/lpcutilities). Instructions for using the tool are located at the same
web page.
4.3 VCOM port
The identifier of the VCOM port will vary between boards and hosts. To determine the
COM port, open the Windows operating system Device Manager. This can be achieved
by going to
the Windows operating system Start menu and typing “Device Manager” in
the search bar
. In the device manager look under “Ports”; the LPC-LinkII UCom Port
device and its name should be visible.
Fig 4.
Identifying the VCOM port
Note that the J-Link firmware image also includes a VCOM port capability; this will
appear as a device called JLink CDC UART Port (COMxxx), where xxx indicates a
number that will vary depending on your system.
4.4 Using the on-board Link2 to debug an external target
The on-board Link2 debug probe may be used to debug an off-board target (other than
the Module. To do this install a jumper on JP2 in position 2-3, and connect SWD
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