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ppr1 todo updates

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Kevin Hester 2020-10-28 09:48:28 +08:00
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docs/software/nrf52-TODO.md
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### PPR1 TODO
* fix usb - I think the problem is VBUS in HW
* Test GPS - try pulsing reset - no joy. R19 is the resistor on the TX path from GPS to CPU
R17 is the resistor for V_BK GPS power (measured 3V - ok!), R20 is the resistor for the RX path from CPU to GPS. R18 for RESET (it is low and GPS reset is high - ok!)
* V_BK for the GPS should probably be supplied from something always on
* use S113 soft device 7.2.0