74 lines
3.1 KiB
Markdown
74 lines
3.1 KiB
Markdown
# HOWTO use custom build of rusEFI for CAN bus sniffing
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In this HOWTO I will explain how to see raw CAN message flow with less than $30 in hardware & some free software.
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## Step 1: shopping cart
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1. Get an [STM32F4DISCOVERY](http://www.st.com/web/catalog/tools/FM116/SC959/SS1532/PF252419) micro-controller board - there are 'Order Now' buttons at the bottom of the official page.
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2. Get an [SN65HVD230 CAN Board](http://www.wvshare.com/product/SN65HVD230-CAN-Board.htm)
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3. Get a "OBD2 16-Pin Male to Female Diagnostic Extension Cable" on eBay
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4. Get a microUSB cable (one which comes with any Android phone)
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## Step 2: putting hardware together
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Cut the OBD extension cord into two pieces, we would need the part with the male connector. Find the wires for pins #6 and #14
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Run some wires from these pins to CANH (high) and CANL (low) screw terminals of the can module.
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Here is how the end result should look like:
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Ignore the white wire - we do not need it.
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Run female-female jumper wires to connect TX on the CAN module with pin PB6 on the discovery board. RX on the module to pin PB12. GND to GND. +3v to +3v.
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Hardware is ready!
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## Step 3: software
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1. Download and install [STSW-LINK004 STM32 ST-LINK utility](http://www.st.com/web/en/catalog/tools/PF258168)
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2. Firmware: download and unzip [rusefi_can_sniffer.zip](http://rusefi.com/images/forum_posts/CAN/rusefi_can_sniffer.zip)
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3. Uploading the firmware: Connect stm32f4discovery to your laptop using a mini-USB cable (one should come with the board), install driver, start St-Link Utility.
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click 'Target'>'Program...'
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Point the utility to the rusefi_can_sniffer.hex file and hit 'Start'
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Close ST Link Utility.
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4. Now it's time to connect the micro USB cable. Keep miniUSB cable connected - you should have two USB cables connected. When you do this for the first time your Windows would prompt for drivers, you should download & install [virtual COM driver](http://www.st.com/web/en/catalog/tools/PF257938)
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Once the driver is installed, you can verify serial connectivity by opening your Device Manager - we are expecting to see a Virtual COM Port.
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Remember the number of the COM port.
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5. Download and launch [Putty](http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html) telnet application.
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Now connect the obd connector to your vehicle and you should see the CAN messages flowing in putty.
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