added arm-controller-single with drv8701p

[minh7a6]

PR Checklist

DO NOT EDIT THESE OR MARK THEM AS COMPLETE. They are for the reviewer.

• [ ] General
  • [x] Schematic is clean and readable.
  • [ ] Eagle DRC runs with no errors.
  • [ ] Board outline meets requirements.
• [ ] Connections
  • [x] Pinouts of all components have been double checked with the datasheets.
  • [x] Connections on headers are correct and comply with standards.
• [x] Power
  • [x] Required power rails are present with correct current requirements.
  • [x] Power traces meet current requirements
  • [x] Proper circuit protection is in place. (fuses, TVS diodes, etc.)
• [ ] Documentation
  • [ ] Wiki Page is complete and contains no glaring errors.
  • [ ] Schematic is well-documented, with calculations where it is necessary.

[davidlenfesty]

One clarification: What MOSFETs are you using? Could you start filling in info on a new Wiki page?

Issues:

• Current shunt is a bit large right now. Maybe switch to two resistors from this search?
• Instead of setting the VREF pin on the DRV8701 to 3v3, connect it to a DAC pin on the STM32. This way we can set current limiting to be whatever we want.
• I'm assuming you followed the design stages from the datasheet, but it would still be a good idea to document calculations in the schematic. Specifically for the IDRIVE resistor, the CP capacitors, and the current shunt resistor.
• There should also be some pinout documentation, the Wiki would be the best place for that.
• One little wire stub that doesn't matter but fails DRC.

Everything else looks great! Just a few tweaks here and there. If you want to make these changes right away that's good, I can do it later too, probably this weekend at the earliest.