Thomas makes, writes

Debugging the free_ecb_at91 board using JTAG

source: wikipedia

For a school project early 2007 (a study of embedded Linux on the AT91RM9200 ARM9 processor) I got familiar with the GNU development tools and setup required to run a Linux based operating system.

Using the setup described here I was able to inspect the inner workings of Darrell loader in real time, set hardware breakpoints, step through the program flow and inspect values of program variables while the CPU core was halted.

Continue reading ...

JAL Programmable Logic Controller

jal plc

When my brother was doing his last year of high-school in electromechanics, he came up with the idea of doing his final project using a homebuilt PLC instead of the usual Siemens stuff. I built the electronics and came up with a framework so he could easily implement his GRAFCET statemachine for his part sorting robot for the PICMICRO in the JAL programming language.

This was long before Arduino, long before 'all the cool kids were doing it', and JAL was a free compiler for the affordable PIC microcontrollers. The Arduino of its days.

Continue reading ...