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