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Bringup: Digital #2

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opened 2022-10-17 18:21:58 +02:00 by markus · 2 comments
markus commented 2022-10-17 18:21:58 +02:00
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  • USB Bootloader
  • Battery monitor
  • VBus detection
  • Accelerometer (+Vaux)
  • LED level shifter
  • LED string
- [x] USB Bootloader - [ ] Battery monitor - [x] VBus detection - [x] Accelerometer (+Vaux) - [x] LED level shifter - [x] LED string
markus commented 2022-10-20 12:59:37 +02:00
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Even before bringup, this board is a disaster.

CPU doesn't support 12 MHz, which is required by V-USB. Adding a crystal could be done through a mod, but that will violate the MHz-vs-voltage spec.

Even before bringup, this board is a disaster. CPU doesn't support 12 MHz, which is required by V-USB. Adding a crystal could be done through a mod, but that will violate the MHz-vs-voltage spec.
markus commented 2024-03-10 17:06:18 +01:00
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  • Add 16 MHz crystal, rewire I/Os
  • Remove level shifter, connect directly
  • CPU is always powered from the cell, meaning the 12 mA current draw of the system will prevent the charger from ever turning off it's output, so we don't know when we've finished charging unless we go into suspend (~20 uA). But then, when we turn back on, the CPU will run exclusively from the cell as the charger turned its output off. -> Solution: Force CPU into suspend when connected to power, waking on status signal changes. Or just live with it.
* Add 16 MHz crystal, rewire I/Os * Remove level shifter, connect directly * CPU is always powered from the cell, meaning the 12 mA current draw of the system will prevent the charger from ever turning off it's output, so we don't know when we've finished charging unless we go into suspend (~20 uA). But then, when we turn back on, the CPU will run exclusively from the cell as the charger turned its output off. -> Solution: Force CPU into suspend when connected to power, waking on status signal changes. Or just live with it.
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Reference: markus/leddie#2
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