Questions tagged [lpc]

LPC is a series of 32-bit ARM microcontrollers manufactured by NXP Semiconductors.

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20
votes
2answers
10k views

Termination resistors: are they needed?

For a project I'm designing, I'm using an IS42s32800 (TSOP) SDRAM with an LPC1788 (QFP) microcontroller. On the PCB I have 4 layers with a ground plane right below the top signal layer and a VDD plane ...
10
votes
1answer
7k views

Storing a secure key in an embedded device's memory

I am working on an embedded device which send/receive data and stored them in ciphertext mode (encrypted mode). Now what's best approach for storing keys (I used ARM CORTEX M series MCU)? 1-Storing ...
1
vote
1answer
3k views

openOCD flash 'erase_sector' command NOT erasing lpc1768?

I am trying to debug LPC1768 using a JTAG debugger and openOCD(version 0.7.0). My os is Win7 . I'm connetced to the openOCD via telnet(port 4444) commands like halt, flash info, resume etc do work ...
5
votes
3answers
6k views

Why isn't my SysTick_Handler() being called in my LPCxpresso C++ Project?

I have created a C++ project for an LPC1227 using LPCExpresso 6.1.0. The project, up until now, builds and runs fine. I have not made any changes to ...
5
votes
1answer
869 views

Can an LPC1343 accept its initial program over USB?

The LPC13xx datasheet suggests some clock setup is necessary to use USB. Does the chip's built in boot loader make it possible to load the initial program over USB, or do the clock multipliers have to ...
1
vote
3answers
953 views

LPC1768 Power Supply Design (an unknown symbol)

I have a question about power supply design for a board which use an LPC1768. Below image is taken from http://www.nxp.com/documents/other/IAR_LPC1768_Eval_Board_Schematic.pdf document. There is a ...
1
vote
2answers
178 views

ALU,RAM and ROM test for LPC 1778

Im working on a non safety project and as part of the Initialization tests I wanted to check the internal memory of LPC1778 for proper functionality before beginning the application. I dont intend to ...
0
votes
1answer
162 views

How to update the SWDAP firmware?

1. About the SWDAP probe I bought an SWDAP probe some time ago from L-Tek (see https://www.l-tek.com/web-shop/l-tek-swdap-interface/). It took me some time to figure out the terminology, but I ...
0
votes
2answers
194 views

DAPLink firmware doesn't operate with OpenOCD

  Why this is not a duplicate Some people seem to think this question is a duplicate, but there is an important difference: The How to update the SWDAP firmware? question is all about how to ...