BPI-M1 CAN Bus
In order to port can4linux to the BananaPi, the CAN module description is needed from the A20 hardware manual. can4linux is a character-driver-based Linux driver used already on desktop PCs and embedded platforms like Freescale FlexCAN (the i.MX series of micro controllers) or Xiliny Zynq.
There is a more detailed document about CAN on the A20 at https://dl.linux-sunxi.org/A20/CAN Bus1.pdf
This is a tutorial for using CAN BUS on bananapi with bananian 15-01
Thank selqcir share this example:
Download and install "bananian-1501.img" into 8 GB SDCard.
Expand the root file system using "bananian-config"
Install missing package:
apt-get install git apt-get update apt-get upgrade reboot
Get last bananian available, and continu to install missing package:
git clone https://github.com/Bananian/linux-bananapi apt-get install build-essential u-boot-tools uboot-mkimage apt-get install libusb-1.0-0 libusb-1.0-0-dev git wget fakeroot kernel-package zlib1g-dev libncurses5-dev apt-get install subversion
Build kernel:
cd linux-bananapi make menuconfig
Exit without saving when menu appears
zcat /proc/config.gz > /root/linux-bananapi/.config make uImage modules make INSTALL_MOD_PATH=output modules_install
At this step, kernel should be compiled and "Module.symvers" should be available
Then rename modules and firmware provide by Bananian, and replace by the new one.
mv /lib/modules /lib/modules.old mv /lib/firmware /lib/firmware.old mv /root/linux-bananapi/output/lib/modules /lib/modules mv /root/linux-bananapi/output/lib/firmware /lib/firmware
Same for uImage:
mount /dev/mmcblk0p1 /mnt cd /mnt mv uImage uImage.old mv /root/linux-bananapi/arch/arm/boot/uImage /mnt reboot
Create link for further build:
cd /lib/modules/3.4.104/ ln -s /root/linux-bananapi build cd ~
Get Can4Linux and build it:
svn checkout https://svn.code.sf.net/p/can4linux/code/trunk can4linux-code cd /root/can4linux-code/can4linux/ make TARGET=BANANAPI
Install module for each startup of the board:
insmod can4linux.ko cp can4linux.ko /lib/modules/3.4.104/kernel/net/can/ depmod -A -v modprobe -v can4linux echo "" >> /etc/modules ; echo "can4linux" >> /etc/modules reboot
Build CAN example
apt-get install swig apt-get install python-dev cd can4linux-code/can4linux-examples/
Update CAN speed and device in file "pyCan-example.py"
ex:
# setting the device number device = 0 defaultBaudrate = '250'
Connect CAN transceiver and CAN bus, and check with for example:
python pyCan-example.py
That's all
With this method, kernel version is "Linux bananapi 3.4.104" instead of "Linux bananapi 3.4.104+", because i was unable to find same sources than Bananian 15-01 , but CAN bus work !
Feel free to comment or update.
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