emWin Graphic Library with Graphical User Interface
User & Reference Guide
Document: UM03001
Software version: 5.20
Document revision: 2
Date: March 8, 2013

V1.1 Applied patch by segger to update from V5.20C to V5.20D.
-----------------------------------------------------------------------------------

LWIP bandwidth and timing tests

These tests were performed with LPCOpen v1.03 on a Linux desktop host (1GBPS) and a target board (100MBPS) with a 1GBPS switched between host and board.

Building automation systems based on KNX communication protocols

The tiny FAT file system emulation in the bootloader uses a fixed translation from FAT cluster number to flash address. Once the old firmware has been deleted in the file browser (e.g Windows Explorer) on the host, all clusters are available for following write operations. Windows use them sequentially starting at the first available cluster. However, Linux starts at the second cluster, and this leads to the code ending up at the wrong location (here: 1 KB shifted, since a cluster contains two file system sectors of 512 bytes).

LPCOpen processor, board, and toolchain support

Examples were build tested with the following toolchain versions - this only applies to the latest LPCopen version.

IAR EWARM v1.02, Keil UV4 v4.70, LPCXpresso v5.2.4_2122

Supported project list for IAR EWARM v1.02

Keep an eye on this page for information on upcoming releases of LPCOpen. Features, updated drivers, and new devices/boards are continuously be added to LPCOpen, but the planned release dates and features may change without notice!

Would you like to request a feature for LPCOpen? You can request new features on the NXP support page.

Introduction

This app note explains how to implement the PMBus using the LPC microcontroller

The following formula may be used to calculate a parallel resonant crystal's external load capacitors:
CL = ((CX1 x CX2) / (CX1 + CX2)) + Cstray
where:
CL = the crystal load capacitance
Cstray = the stray capacitance in the oscillator circuit, which will normally be in the 2pF to 5pF range.

Assuming that CX1=CX2 then the equation becomes:
CL = ((CX1 x CX1) / (2 x CX1)) + Cstray
CL = (CX1 / 2) + Cstray
Rearranging the equation, we can find the external load capacitor value:
CX1 = 2(CL - Cstray)

For example, if the crystal load capacitance is 15pF, and assuming Cstray=2pF, then: