36 lines
1.3 KiB
Markdown
36 lines
1.3 KiB
Markdown
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# Things to do and random ideas
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## Hardware Change Ideas
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* Connectors for I2C,SPI,neopixel ...
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* Could double as a connector for a small daughterboard
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* Fine pitch connector for the debug connector
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* Tiny buttons for rst/boot1 ...
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* On board g-force/gyro chip, or as a small daughterboard
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* Change to a 5V DCDC and a linear 3.3V? To provice 5V for things like LEDs and servos.
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### Software
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* Develop a CAN bus capable bootloader for flashing over CAN. Probably needs incompatible changes to the CAN protocol
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* Improve the CAN bus protocol to be more bandwidth efficient. Such as rely on CAN CRC and remove klipper CRC
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* Modify klipper firmware to keep USB usable when using CAN bus
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* At least allow USB to detect boot loader trying to flash
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* Automatic switching to/from USB when connected
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#### Bugs/flaws
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* It's not possible to enter DFU bootloader when in klipper firmware automatically. The SWD pins might be in the wrong state.
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* The CanSerial utility/Linux CAN bus interface is not as stable as you might wish
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### Hardware issues
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* The TPS54308 DCDC converter generates a lot of heat at idle. Is there a better way to get 3.3V with low ripple?
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## Hardware Cost Cutting
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* Use an STM32F0
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* no crystal needed? Even for CAN?
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* Change to some cheap generic DCDC controller.
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