Debugging Embedded Microprocessor Systems leechatrip From 1 by Stuart Ball

By Stuart Ball

Debugging Embedded Microprocessor structures presents options for engineers, technicians, and scholars who have to right layout faults in embedded structures. utilizing real-world situations, designers can research sensible, time-saving how you can stay away from and service probably expensive difficulties. Prevention is stressed.
In this publication, the writer addresses and software program matters, together with up-front layout concepts to avoid insects and comprise layout creep. functional suggestion comprises descriptions of universal instruments which are used to aid establish and service insects, in addition to attempt exercises. RTOS and embedded computer environments also are covered.
Each bankruptcy of Debugging Embedded Microprocessor structures opens with an instance layout challenge which illustrates real-world concerns resembling layout alterations, time pressures, gear or part availability, and so forth. Case reports of earlier debugging initiatives are awarded within the ultimate chapter.
Addresses real-world concerns like layout adjustments, time pressures, apparatus or part availability
Practical, time-saving tools for combating and correcting layout problems
Covers debugging instruments and programmer try out workouts

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L . , l I . , ~... ~orll I L , , , . I I I q I . 9- . o , > .... , , 9 t4elilel. elqm~e n . , ,... 9 ,," 9 ". 9 . ' ". 9 , . i . ". - - -e ql,i;,i Ir~ ,. i .... '~ I . ~ . /. 'T 6 , l .. 3 VisualProbe Simulator (SSI, Irving, CA) debug. If you have to walk down the hall and into another lab to erase your PROMs, you will tend to let them lie around the bench until you need to make a change and discover that none of your PROMs are erased. Then you've got a 20-minute wait before you can proceed. Flash PROM and other EEPROM (Electrically Erasable PROM) technology makes erasing easier---the programmer can erase the parts before programming them, making a UV eraser unnecessary.

Sometimes there is no address decode logic, or all the strobes are used, or some other situation prevents you from using a decoded write strobe to trigger the analyzer. In this case, there are other tricks you can use to generate a strobe for the trace data. Write to ROM In most embedded systems, the only thi_qg in the ROM space is the ROM itself. However, the address decoding logic often does not differentiate between a read and a write. If you write your trace data to the ROM space, it usually will not affect any hardware.

7 shows an 8031 with logic to detect and generate a write strobe on read-from-ROM. In this case, the circuit uses a 27256 EPROM, which requires 32k of the 64k address space. We decode any read from the upper 32k of the address space (A15=1) as a trace output. The code to implement this read-from-ROM technique is shown below. TestHeader I like to put a 10-pin inline or dual-row header on boards for the trace output signals. Eight pins are for the data lines (16, if I'm using a 16-bit processor), one for the write strobe, and one for ground.

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