![]() ![]() If serial port is not available on the embedded system, then use a hardware tool to convert USB/serial port data to digital signals (also inexpensive and easy to achieve). Using TeraTerm as a serial port signal injector, and writing some TeraTerm macros (takes about 20 minutes), there is a huge suite of automated tests which can be run against any part of an embedded system - whether driver layer, O/S, layer 4-5, etc. I completely disagree with this part of your question: "automation would be great but hard and expensive to achieve." Use this to send test data (best option is terse ascii formatted so it is easily simulated by humans too). The embedded system will have some way of interfacing with a host system (typically via a serial port reserved for debugging). ![]() A necessary tool to develop is a signal injector.
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