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12
README.md
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@ -23,16 +23,6 @@ Communication is done over the VP230 CAN Transceiver, though it doesn't look to
Instead the STM32 USART1 is connected so it's doing Syncronous UART over CAN. So it's really Instead the STM32 USART1 is connected so it's doing Syncronous UART over CAN. So it's really
just using the VP230 for differential signaling. just using the VP230 for differential signaling.
# What's Done # Reading
* Schematic of STM32 <-> VP230 (CAN Bus)
* Verified STM32 read protection is in place :(
# Bus Splitter
The `bus_splitter` directory contains a KiCAD project to attempt reverse engineering the protocol
'monkey-in-the-middle' style. It contains two CAN bus transceivers, with the UART in between them
being passed to a set of header pins. The idea being the RX/TX pins can be attached to an
external microcontroller, allowing message to be inspected, modified and/or passed through as is.
# Further Reading
https://www.eevblog.com/forum/manufacture/neoden-tm245p-teardown-and-upgrade/ https://www.eevblog.com/forum/manufacture/neoden-tm245p-teardown-and-upgrade/

6084
bus_splitter/bus_splitter.kicad_pcb
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420
bus_splitter/bus_splitter.kicad_pro
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@ -1,420 +0,0 @@
{
"board": {
"design_settings": {
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"copper_line_width": 0.19999999999999998,
"copper_text_italic": false,
"copper_text_size_h": 1.5,
"copper_text_size_v": 1.5,
"copper_text_thickness": 0.3,
"copper_text_upright": false,
"courtyard_line_width": 0.049999999999999996,
"dimension_precision": 4,
"dimension_units": 3,
"dimensions": {
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"extension_offset": 500000,
"keep_text_aligned": true,
"suppress_zeroes": false,
"text_position": 0,
"units_format": 1
},
"fab_line_width": 0.09999999999999999,
"fab_text_italic": false,
"fab_text_size_h": 1.0,
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"fab_text_thickness": 0.15,
"fab_text_upright": false,
"other_line_width": 0.15,
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"other_text_size_h": 1.0,
"other_text_size_v": 1.0,
"other_text_thickness": 0.15,
"other_text_upright": false,
"pads": {
"drill": 0.762,
"height": 1.524,
"width": 1.524
},
"silk_line_width": 0.15,
"silk_text_italic": false,
"silk_text_size_h": 1.0,
"silk_text_size_v": 1.0,
"silk_text_thickness": 0.15,
"silk_text_upright": false,
"zones": {
"45_degree_only": false,
"min_clearance": 0.508
}
},
"diff_pair_dimensions": [],
"drc_exclusions": [],
"meta": {
"version": 2
},
"rule_severities": {
"annular_width": "error",
"clearance": "error",
"copper_edge_clearance": "error",
"courtyards_overlap": "error",
"diff_pair_gap_out_of_range": "error",
"diff_pair_uncoupled_length_too_long": "error",
"drill_out_of_range": "error",
"duplicate_footprints": "warning",
"extra_footprint": "warning",
"footprint_type_mismatch": "error",
"hole_clearance": "error",
"hole_near_hole": "error",
"invalid_outline": "error",
"item_on_disabled_layer": "error",
"items_not_allowed": "error",
"length_out_of_range": "error",
"malformed_courtyard": "error",
"microvia_drill_out_of_range": "error",
"missing_courtyard": "ignore",
"missing_footprint": "warning",
"net_conflict": "warning",
"npth_inside_courtyard": "ignore",
"padstack": "error",
"pth_inside_courtyard": "ignore",
"shorting_items": "error",
"silk_over_copper": "warning",
"silk_overlap": "warning",
"skew_out_of_range": "error",
"through_hole_pad_without_hole": "error",
"too_many_vias": "error",
"track_dangling": "warning",
"track_width": "error",
"tracks_crossing": "error",
"unconnected_items": "error",
"unresolved_variable": "error",
"via_dangling": "warning",
"zone_has_empty_net": "error",
"zones_intersect": "error"
},
"rules": {
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"allow_microvias": false,
"max_error": 0.005,
"min_clearance": 0.0,
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"min_hole_clearance": 0.25,
"min_hole_to_hole": 0.25,
"min_microvia_diameter": 0.19999999999999998,
"min_microvia_drill": 0.09999999999999999,
"min_silk_clearance": 0.0,
"min_through_hole_diameter": 0.3,
"min_track_width": 0.19999999999999998,
"min_via_annular_width": 0.049999999999999996,
"min_via_diameter": 0.39999999999999997,
"solder_mask_clearance": 0.0,
"solder_mask_min_width": 0.0,
"use_height_for_length_calcs": true
},
"track_widths": [],
"via_dimensions": [],
"zones_allow_external_fillets": false,
"zones_use_no_outline": true
},
"layer_presets": []
},
"boards": [],
"cvpcb": {
"equivalence_files": []
},
"erc": {
"erc_exclusions": [],
"meta": {
"version": 0
},
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],
"rule_severities": {
"bus_definition_conflict": "error",
"bus_entry_needed": "error",
"bus_label_syntax": "error",
"bus_to_bus_conflict": "error",
"bus_to_net_conflict": "error",
"different_unit_footprint": "error",
"different_unit_net": "error",
"duplicate_reference": "error",
"duplicate_sheet_names": "error",
"extra_units": "error",
"global_label_dangling": "warning",
"hier_label_mismatch": "error",
"label_dangling": "error",
"lib_symbol_issues": "warning",
"multiple_net_names": "warning",
"net_not_bus_member": "warning",
"no_connect_connected": "warning",
"no_connect_dangling": "warning",
"pin_not_connected": "error",
"pin_not_driven": "error",
"pin_to_pin": "warning",
"power_pin_not_driven": "error",
"similar_labels": "warning",
"unannotated": "error",
"unit_value_mismatch": "error",
"unresolved_variable": "error",
"wire_dangling": "error"
}
},
"libraries": {
"pinned_footprint_libs": [],
"pinned_symbol_libs": []
},
"meta": {
"filename": "bus_splitter.kicad_pro",
"version": 1
},
"net_settings": {
"classes": [
{
"bus_width": 12.0,
"clearance": 0.2,
"diff_pair_gap": 0.25,
"diff_pair_via_gap": 0.25,
"diff_pair_width": 0.2,
"line_style": 0,
"microvia_diameter": 0.3,
"microvia_drill": 0.1,
"name": "Default",
"pcb_color": "rgba(0, 0, 0, 0.000)",
"schematic_color": "rgba(0, 0, 0, 0.000)",
"track_width": 0.25,
"via_diameter": 0.8,
"via_drill": 0.4,
"wire_width": 6.0
}
],
"meta": {
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},
"net_colors": null
},
"pcbnew": {
"last_paths": {
"gencad": "",
"idf": "",
"netlist": "",
"specctra_dsn": "",
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"vrml": ""
},
"page_layout_descr_file": ""
},
"schematic": {
"annotate_start_num": 0,
"drawing": {
"default_line_thickness": 6.0,
"default_text_size": 50.0,
"field_names": [],
"intersheets_ref_own_page": false,
"intersheets_ref_prefix": "",
"intersheets_ref_short": false,
"intersheets_ref_show": false,
"intersheets_ref_suffix": "",
"junction_size_choice": 3,
"label_size_ratio": 0.375,
"pin_symbol_size": 25.0,
"text_offset_ratio": 0.15
},
"legacy_lib_dir": "",
"legacy_lib_list": [],
"meta": {
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},
"net_format_name": "",
"ngspice": {
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"fix_passive_vals": false,
"meta": {
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},
"model_mode": 0,
"workbook_filename": ""
},
"page_layout_descr_file": "",
"plot_directory": "",
"spice_adjust_passive_values": false,
"spice_external_command": "spice \"%I\"",
"subpart_first_id": 65,
"subpart_id_separator": 0
},
"sheets": [
[
"e63e39d7-6ac0-4ffd-8aa3-1841a4541b55",
""
]
],
"text_variables": {}
}

2117
bus_splitter/bus_splitter.kicad_sch
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