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https://github.com/arashem/meta-canexp
Add mcp2515 to ASUS-tinker
https://github.com/arashem/meta-canexp
asus-tinkerboard canbus-communications mcp2515
Last synced: 10 days ago
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Add mcp2515 to ASUS-tinker
- Host: GitHub
- URL: https://github.com/arashem/meta-canexp
- Owner: ArashEM
- License: mit
- Created: 2023-09-01T14:20:08.000Z (over 1 year ago)
- Default Branch: dunfell
- Last Pushed: 2023-09-22T09:13:46.000Z (over 1 year ago)
- Last Synced: 2024-11-14T15:06:00.619Z (2 months ago)
- Topics: asus-tinkerboard, canbus-communications, mcp2515
- Language: BitBake
- Homepage:
- Size: 298 KB
- Stars: 3
- Watchers: 1
- Forks: 0
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- License: COPYING.MIT
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README
# Introduction
This layer helps you to add `mcp2515` module into _ASUS-Tinker_ board.
# Getting started
1. Clone required layers:
```bash
git clone git://git.yoctoproject.org/poky -b dunfell
cd poky/
git clone git://git.yoctoproject.org/meta-rockchip -b dunfell
git clone https://github.com/openembedded/meta-openembedded.git -b dunfell
git clone https://github.com/ArashEM/meta-canexp.git -b dunfell
cd ../
```
2. Export template configuraiton path and initialize build envrionment
```bash
export TEMPLATECONF=${TEMPLATECONF:-meta-canexp/conf}
source poky/oe-init-build-env tinker-board/
```
3. Start build process
```bash
bitbake core-image-full-cmdline
```
# Connections
This is top view of _AUSU-Tinker_ 40 pin header.
| `mcp2515` | `Tinker pinout` | `Number` | `Number` | `Tinker pinout` | `mcp2515` |
| --------- | --------------- | -------- | -------- | --------------- | --------- |
| **3v3** | **3v3** | 1 | 2 | **5v0** | **5v0** |
| - | - | 3 | 4 | - | - |
| - | - | 5 | 6 | **GND** | **GND** |
| **INT** | **GP0C1** | 7 | 8 | - | - |
| - | - | 9 | 10 | - | - |
| - | - | 11 | 12 | - | - |
| - | - | 13 | 14 | - | - |
| - | - | 15 | 16 | - | - |
| - | - | 17 | 18 | - | - |
| **SI** | **SPI2TX** | 19 | 20 | - | - |
| **SO** | **SPI2RX** | 21 | 22 | - | - |
| **SCK** | **SPI2CLK** | 23 | 24 | **SPI2CSN0** | **CS** |
| - | - | 25 | 26 | - | - |
| - | - | 27 | 28 | - | - |
| - | - | 29 | 30 | - | - |
| - | - | 31 | 32 | - | - |
| - | - | 33 | 34 | - | - |
| - | - | 35 | 36 | - | - |
| - | - | 37 | 38 | - | - |
| - | - | 39 | 40 | - | - |
# View
Here is what it looks like :-)
Connectig `rasppberypi` and `asus-tinker` via **CAN** network.
Here is what happend over `SPI` and `CAN` when I issued `cansend can0 100#11223344deadbeef` from `rasppbery`
# Notes
Please note that:
1. `dunfell` branch of `meta-rockchip` use Linux version **5.4.205** by default. But for using `isotp` and `socketcand` you need at least Linux version **5.10.0** or later. I handled it by adding `PREFERRED_PROVIDER_virtual/kernel ?= "linux-yocto-dev"` to `conf/local.conf.sample`.
2. You need to provide **5v0** supply for CAN transceiver (`tja1050`) because it won't work with **3v3** supply from _ASUS-Tinker_. (this [link](https://github.com/tolgakarakurt/CANBus-MCP2515-Raspi) is very good instruction about fixning this issue)
3. As you can see in [0001-add-can-interface.patch](recipes-core/init-ifupdown/init-ifupdown/0001-add-can-interface.patch), I'm using **125Kbps** bitrate
4. In order to change `SPI` interface (e.g. using `SPI0`) or interrupt pin, you need to change [0001-add-mcp2515-interface.patch](recipes-kernel/linux/linux-yocto-dev/0001-add-mcp2515-interface.patch) file.
5. Becarefule about interrupt pin! It **MUST** be and unclaimed GPIO pin. you can check ` /sys/kernel/debug/pinctrl/pinctrl-rockchip-pinctrl/pinmux-pins` to see status of each pin.
# More
1. This [presentation](https://wiki.automotivelinux.org/_media/agl-distro/agl2017-socketcan-print.pdf) explain SocketCAN in very good detail
2. You can use [SavvyCAN](https://www.savvycan.com/) with [socketcand](https://github.com/linux-can/socketcand). This way you have full access to `can0` interface of _ASUS-Tinker_ over ethernet and great GUI of SavvyCAN
3. The book [The Car Hacker's Handbook](https://www.oreilly.com/library/view/the-car-hackers/9781457198847/) provide valuable information about CAN and car internel network