LailaTheElf/KlipperToolboard
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2021-02-05 09:44:13 +01:00
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doc/canbus.md
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@@ -8,26 +8,29 @@ You will need a CAN bus adapter for your Raspberry Pi (or other board you run kl
![Waveshare CAN HAT](wavesharecanhat.jpg)
The MCP2515 is a very common SPI connected CAN bus chip. It is a pretty bad options since it has very small buffers on chip and creates a lot of CPU load on the Raspberry Pi. It is not recomended if you use more than 1 or 2 boards.
The MCP2515 is a very common SPI connected CAN bus chip. It is a pretty bad options since it has very small buffers on chip and creates a lot of CPU load on the Raspberry Pi. It is not recomended if you use more than 1 or 2 boards.
You have to run the CAN bus at 250kbits/s or possibly 500kbits/s.
When using an MCP2515 hat you have to increate the linux CAN bus tx queue length or the system will not be stable. "ip link set can0 txqueuelen 128". This is again due to the lack of buffers in the MCP2515.
TBD: The txqueue can be set at reboot using udev, how is that done?
TBD: Is the MCP2517FD based HATs any better? They are made for CAN-fd but should be backwards compatible.
Easily available option is "Waveshare RS485 CAN HAT"
There are some dirt cheap MCP2515 boards made for arduino. Some hacking might be needed to make them use 3.3V for SPI, the raspberry is not 5V tolerant!
TBD: Is the MCP2517FD based HATs any better? They are made for CAN-fd but should be backwards compatible. As the drivers are not in the mainline kernel it's non-trivial to get an MCP2516 to work.
An easily available option is "Waveshare RS485 CAN HAT"
### USB CAN adapter
![Canable USB CAN clone](canable.jpg)
There is a very good open source firmware for STM32 based USB adapters, https://github.com/candle-usb/candleLight_fw. Any board running this firmware should work fine. There are plenty of open source hardware alteratives that runs this firmware. Unforunately they can be a bit hard to buy and you have to turn to aliexpress or ebay to find clones. Search for canable or cantact.
If someone can find a good board please tell me so I can recomend one.
![Inomaker USB CAN](innomakerusbcan.jpg)
The better option
The Innomaker This product is readily available on Amazon and many other places. It's optically isolated and high performace, a good product on paper.
Easily available option is "Innomaker CAN to USB adapter". It is even optically isolated.
Update Feb 2 2021: Unfortunately this adapter has bugs in the firmware that reorders incoming packets when reveiving a lot of data. It causes major problems for klipper. Not recomended!
## Linux setup
@@ -41,13 +44,8 @@ The program will open virtual serial ports in /tmp when boards are discovered on
## Wiring
### Connecting Huvud
There are two options to connect the Huvud board, either use the 4-pin JST-PH connector or the combined power and CAN bus Molex Micro-fit. All CANL pins are connected together on the board, same with the CANH pins.
### Cables
CAN bus is a bus, it must be terminated at each end with 120ohm resistors.
Twisted pair ... Ethernet cables or specifically made CAN bus cables. If shielding is used it should only be grounded at one point.

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doc/pinout.md
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@@ -36,16 +36,16 @@ Max 4A. Enough for a 100W heater when running on 24V
### Endstop
The endstop supplies 3.3V to work with an optical endstop sensors. For a microswitch (NO) connect it to GND and Signal.
Please note that klipper requires an enstop to be on the same board as the stepper driver, if the board is used for an extruder the endstop can not be used for a bed probe. The endstop works as a filament runout on a hotend, or as an axis endstop if the board is used for movement.
Please note that klipper at the moment requires an endstop to be on the same board as the stepper driver. If the board is used for an extruder the endstop can not be used for a bed probe. The endstop can be used as a filament runout on a hotend, or as an axis endstop if the board is used for movement.
### CAN bus
The CAN bus can be hooked up in multiple different ways. There is a 4-pin JST-PH connector with two pairs of CANL/CANH, and a 2x2 pin Molex Micro-fit shared with power.
Power and CAN bus in in the same Molex MicroFit connector.
There is no on board CAN bus termination resistor.
### LED
There is a user controlled green LED near the debug connector, it is connected to PC13.
There is a user controlled green LED near the debug connector, it is connected to PC13. It is normally on while klipper is running. It's also used by the HID bootloader to signal various states.
## Thermals