38 lines
1.7 KiB
Markdown
38 lines
1.7 KiB
Markdown
# RE-TM245P
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The end goal of this project is to convert a partially broken TM245P Pick and Place to OpenPNP
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while replacing as little hardware as possible. The difficulty in this is that the feeders and
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everything on the head are CAN bus controlled. In an effort to not replace these parts, the
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protocol will need to be reverse engineered.
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# Approaches
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### Smoothieware Port
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The Charmhigh conversion undertaken by others approaches leaving the controller largely intact
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and flashing a Smoothieware port onto the STM32. The repo notes suggest the Charmhigh used an
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STM32F4, which the TM245P also uses. Specifcally the STM32F407ZGT6.
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https://github.com/mattthebaker/Smoothieware-CHMT
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### 'Decap'
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In this approach the entire head unit will be bypassed. Ideally this could be accomplished by
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utilizing the existing IDC connector on the power/comm sub-board.
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# 'CAN Bus'
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Communication is done over the VP230 CAN Transceiver, though it doesn't look to be real CAN.
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Instead the STM32 USART1 is connected so it's doing Syncronous UART over CAN. So it's really
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just using the VP230 for differential signaling.
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# What's Done
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* Schematic of STM32 <-> VP230 (CAN Bus)
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* Verified STM32 read protection is in place :(
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# Bus Splitter
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The `bus_splitter` directory contains a KiCAD project to attempt reverse engineering the protocol
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'monkey-in-the-middle' style. It contains two CAN bus transceivers, with the UART in between them
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being passed to a set of header pins. The idea being the RX/TX pins can be attached to an
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external microcontroller, allowing message to be inspected, modified and/or passed through as is.
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# Further Reading
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https://www.eevblog.com/forum/manufacture/neoden-tm245p-teardown-and-upgrade/
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