Messing about with a HOLTEK HT9290A chip.
- control reading and writing from a µcontroller pin / button
- improve reading
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reading
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after sending a read command, the HT9290 sometimes starts sending data back before the microcontroller has finished sending the read command.
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it appears that when this happens, the following 5 bit chunk is identical to the unreadable one
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writing
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maybe it only takes the first number written after powering up
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could be that it is stuck waiting for more data to be written
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sensitive to number of bytes written after?
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triggering "dialing"
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dailing stops on a read command. perhaps on other commands