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Firmware Development |
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Following toxic chemical concerns, the European Union RoHS and WEEE directives became European law in February 2003, with the deadline for full compliance being set at August 2004. |
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| Author: Pranauk |
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Back in these early days, schematics were drawn on paper using pencil, schematic symbol templates, and lettering machines. Most good engineers, when using a microprocessor/microcontroller, would actually add the hex addresses to the devices connected to the microcontroller bus. This was a useful aid for the engineers ultimately responsible for developing the firmware. Hand-drawn paper-based schematics served their purpose but posed a number of problems. Mistakes had to be erased and redrawn.
Sometimes a majority of the schematic had to be redrawn just to fit the updated circuit change. Then, once a schematic was completed, reviewed, and signed off by a peer review group, a set of blue lines were made and then distributed to the appropriate groups. PCB layouts were typically done by placing pads down on clear vellum and connections made between pads with black tape of various widths.
While the printed circuit boards were being laid out, prototype circuits were built using point-to-point wiring or wire-wrapping techniques, a long and tedious task. Once a firmware bug was found, the designer would attempt a fix, reassemble the code, burn another EPROM, and test the system again. If it hit another bug and the system crashed, the designer would perform another round of crash-and-burn testing. A firmware developer would keep a rail of erased EPROM’s on hand to speed up crash-and-burn testing given how long they took to erase.
For details Visit at http://www.enventureonline.com/
About Author
I am a postgraduate in MBA, has done extensive research in the areas of Business Industry.
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