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The BBB with GPIO pins lets you toggle single pins at a fair rate, with minimal effort.
What about groups of pins? 4 bits wide helps some LCD controllers, 8 bits is common for data, DACs can be 12 bits or more.
How fast can you read? There are plenty of questions about speed limit of reading BBB ADC inputs.
If students have access to test equipment, it can be educational to measure the speed at which you can toggle a single pin, and compare that to the clock rate of the CPU.
- - Alan Campbell
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