Hi,
Unfortunately, there is no SDK for LPC43xx family devices. We currently have no plans to provide MCUXpresso SDK for this device family.
You can use the LPCOpen Software for LPC43xx devices, LPCOpen is an extensive collection of free software libraries (drivers and middleware) and example programs that enable developers to create multifunctional products based on LPC microcontrollers. Access to LPCOpen is free to all LPC developers.
Please check the below link:
http://www.nxp.com/products/software-and-tools/software-development-tools/software-tools/lpcopen-lib...
In addition, please check the below document, this explains how to create a new LPC project using LPCOpen and MCUXpresso IDE.
How to create a new LPC project using LPCOpen and MCUXpresso IDE
Have a great day,
Sol
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