I have always had problems with OpenOCD, mainly due to bad documentation out of sync with the code. I got a new evaluation board for the LM3S2965 processor (EK-LM3S2965) last week and gave OpenOCD a new try, and lo, this has become quite simple. Continue reading ‘Stellaris Cortex and OpenOCD’
Tag Archive for 'linux'
When starting out as an engineer, building electronic circuits of many kinds, my mentor advised me to always leave a copy of the schematics within the box. This is a wise proposition, the schematics in the box will probably be up to date and readily available. On the other hand, external documentation may be displaced and even lost during a period of time. This is equivalent to program documentation: Comments within the source file are easier to keep up to date than some external documentation, like flow sheets.
Now I use a board with a micro controller which flash memory is much larger than what I need for the application. So why not use that spare flash to embed some docs? Continue reading ‘Store docs in the microcontroller’s flash’
Web servers should run under a user who does have minimal rights and files accessible by the server should be owned by and writeable only by another user, preferably root. So, what to do if the cgi script should update a file that is accessible from the web? Continue reading ‘Let a cgi script write a server page file with proper permissions’
This modem uses the 450 MHz band for wireless internet access. InScandinavia this mobile internet access network is operated by ice.net. The following rules andscripts constitute an auto-dialer: when the USB modem is inserted the system automatically connects to the network. Continue reading ‘Auto dial for C-motech D-50 modem’
This is a simple domain-name server for an embedded system in a closed local network. Originally called the Severely Crippled Domain Name Server, this server is now the name server of Busybox.
The purpose of this name server is to give the embedded controller a name, so if connecting a laptop for configuration and other maintenance, the controller provides the laptop with its name so the user can access by name instead of IP number.
Bison is a compiler-compiler which generates a parser basedon a grammar specification. The parser usually runs in a loopgetting new tokens from a lexical scanner.
This push parser works the other way around by letting thescanner call the parser each time a new token is available.
The copyright of this parser skeleton has been transferred to the Free Software Foundation and is now integrated with the Bison project.
This PC is built into a very simple case: a ring binder. The PC is anembedded controller – not used by humans but independently doing its specialunsupervised job. In this case it wakes up once a day, takes a picturewith a USB camera, stores it and then powers off again. Continue reading ‘The ring binder PC’
You may log in to the Luminary web page and download the source files for the ARM Cortex based boards they produce. I needed the source for the brushless motor kit: SW-RDK-BLDC-4694.exe, which is a Windows executable. Continue reading ‘Luminary Stellaris under Linux’
I have lately built several versions of the Linux GCC tool chain for the ARM Cortex processor. But the generated tools do not work properly with floating point, issuing errors about floating point inconsistencies. Continue reading ‘Build gcc for ARM Cortex processor’