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  1. So today I breadboarded an Adesto AT45Dxxxx DataFlash chip with an G2553 (TSSOP28 on a breadboard adapter) and wrote a quick test sketch in Energia using software SPI. The sketch queried the Manufacturer/Device id every second and communication was very spotty with a correct result in only about a fifth of the queries. At first I thought is was a software error so tried various things like adding delay(1-10) after pulling the CS low and stuff like that. Generally it got worse, at least not better. This got me quite confused for an hour or so but during lunch the penny dropped: what if I added some decoupling caps? Sure enough, the datasheet had some hints: Adding 100nF between Vcc and GND pins immediately improved communication a lot (really should have added that one from the start). Adding another cap on the SO-pin resulted in perfect communication, interestingly SO is not mentioned in this context but this may be coincidence in my case. Also adding a 100nF to the SCK or CS line as suggested by the datasheet made communication much worse in my case, perhaps 100nF is a bit too much? Anyway, I learned my lesson (again): decoupling caps are small but beautiful (and necessary). Especially when breadboarding!
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