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features offered by the chips. For 2127 and 2129 chips, fix the detection of when chip-init is needed. The chip config needs to be reset whenever power was lost, but the logic was wrong for 212x chips (it only worked for 8523). Now the "oscillator stopped" bit rather than the power manager mode is used to detect startup after powerfail. For all chips, disable the clock output pin. For chips that have a timestamp/tamper-monitor feature, turn off monitoring of the timestamp trigger pin. The 8523, 2127, and 2129 chips have a "power manager" feature that offers several options. We've been using the default mode which enables everything. Now the code sets the power manager options to - direct-switch (when Vdd < Vbat, without extra threshold check) - no battery monitor - no external powerfail monitor This reduces the current draw while running on battery from 1930nA to 880nA, which should roughly double the lifespan of the battery under load. Because battery checking is a nice thing to have, the code now does a check at startup, and then once a day after that, instead of checking continuously (but only actually reporting at startup). The battery check is now done by setting the power manager back to default mode, sleeping briefly while it makes a voltage measurement, then switching back to power-saving mode.
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