Blogs

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Part Two

USB Protocol

I've created an LPCXpresso project that implements a USB to SWD bridge. This project and code can be reused to create a debugger or flash programmer and consumes about 9K of Flash. I can probably release this code but haven't posted it yet. This chapter describes the USB protocol between the host and the LPC11U14 device.

Part One
Part Three

Common SWD Operations

This blog entry is intended to present a quick summary of common debug operations and how to do them with SWD. For full documentation, see ARM’s Debug Interface v5 Architecture Specification as well as the Cortex-M0 Technical Reference Manual.

The v0.80 version of the LPC port files for LWIP have been release. This version supports standalone applications using the raw API on the Embedded Artists EA1788 board. PHY link monitoring and zero-copy buffer support are included.

More information can be found on the project pages at http://www.lpcware.com/content/project/lightweight-ip-lwip-networking-stack

The files can be downloaded from http://www.lpcware.com/content/nxpfile/lwip-lpc-port-files and are available with history on our GIT server at http://sw.lpcware.com/?p=lwip_lpc.git&a=summary

The dual-core LPC4350 (also the highest-speed M4 MCU) is released and the first evaluation platform, the Hitex board, has gone live in distribution. A Getting Started Guide has just been posted on lpcware.com at: LPC4350 Hitex Board Getting Started Guide.

Part Two
Part Three

nxpUSBlib is a new USB software library designed to run on all LPC microcontrollers. The library includes both host and device stacks, support for many USB classes on each stack, and lots of real world example applications that will accelerate the design of your products.

The library includes pre-built examples for the LPC1769 LPCXpresso board, Hitex LPC1850 Evaluation board, and the Keil MCB1700 evaluation board with the LPCXpresso IDE. Support for the Keil uVision 4 IDE is coming soon!

Abstract: In this article we describe the construction of a portable data acquisition system, based on a NXP LPC1769 development board, designed to continuously measure and record two analog blood pressure instrument channels for 24-hour trials. A sheep implanted with two pressure sensors will carry the device, which can be monitored wirelessly. The data gathered will be used for modelling the physiology of the sheep`s circulatory system during a whole day.

Abstract: An Inertial Navigation System (INS) is a device that estimates the position of a moving object in real time from measurements of inertial sensors. The work presented here is a first approach to INS, where acceleration is measured periodically and position is estimated externally. Data fusion and position calculations is achieved by use of the Kalman Filter. The main hardware consists of NXP's LPC1343 stick and Bosch BMA180 accelerometer.

Abstract: The Theremin is an electronic musical instrument in which the musician controls the pitch and volume of a tone with the distance of his hands to two different antennas. The original Theremin design was fully analog, requiring precise capacitors and inductors, and a manual calibration procedure. Our design is an electronic instrument which can be used just like a Theremin, in which analog hardware is reduced to a minimum (only the output audio stage).

Abstract: The QuiPAD is an audio real time FIR filter controlled by a touchpad that shows how powerful is the NXP LPC1768 microcontroller and how it can process signals without the need of a DSP. The project fully utilizes the GPDMA, ADC, DAC, AHB RAM and a TIMER. The flow of the data is as follows: First the DMA takes the data from the ADC to the RAM. Then a FIR filter function takes the data, processes it, and stores it in another section of the RAM. Finally, another DMA takes the processed data from the RAM to the DAC. This is done continuously and by blocks of data.