DHCOM STM32MP1 Linux

Linux virtual machine for development

Get sources from Github

1. Start the Console on Linux 2. `git clone https://github.com/dh-electronics/linux-stm32mp1.git --branch dev/5.4.69_dhsom` 3. `cd linux-stm32mp1`

Configure and build the Device Tree + Kernel

4. `ARCH=arm CROSS_COMPILE=/opt/gcc-arm-8.3-2019.03-x86_64-arm-linux-gnueabihf/bin/arm-linux-gnueabihf- make stm32mp1_dhsom_defconfig` 5. `ARCH=arm CROSS_COMPILE=/opt/gcc-arm-8.3-2019.03-x86_64-arm-linux-gnueabihf/bin/arm-linux-gnueabihf- make menuconfig` (optional: If you want to add/remove Kernel features) 6. `ARCH=arm CROSS_COMPILE=/opt/gcc-arm-8.3-2019.03-x86_64-arm-linux-gnueabihf/bin/arm-linux-gnueabihf- make dtbs` 7. `ARCH=arm CROSS_COMPILE=/opt/gcc-arm-8.3-2019.03-x86_64-arm-linux-gnueabihf/bin/arm-linux-gnueabihf- make zImage`

Create the FIT-image with our script (Download link)

Interactive mode for selecting device trees	Device trees are set as parameter
8. `create_fitimage` Enter the numbers (space seperated) of the device trees to include (e.g. if you want to include the device tree for the PDK2 include the number of `./arch/arm/boot/dts/stm32mp157c-dhcom-pdk2.dtb` (usually 3). Enter the numbers (space seperated) of the device trees overlays to include (e.g. for the PDK2 enter the files which contain `PDK2` (usually 8 9 10 11 12 13 14).	(Example is for the PDK2) 8. create_fitimage --dtb ./arch/arm/boot/dts/stm32mp157c-dhcom-pdk2.dtb --dtbo ./arch/arm/boot/dts/stm32mp157c-dhcom-pdk2-overlay-460-200-x11.dtbo;./arch/arm/boot/dts/stm32mp157c-dhcom-pdk2-overlay-497-200-x12.dtbo;./arch/arm/boot/dts/stm32mp157c-dhcom-pdk2-overlay-505-200-x12-ch101olhlwh.dtbo;./arch/arm/boot/dts/stm32mp157c-dhcom-pdk2-overlay-531-100-x21.dtbo;./arch/arm/boot/dts/stm32mp157c-dhcom-pdk2-overlay-531-100-x22.dtbo;./arch/arm/boot/dts/stm32mp157c-dhcom-pdk2-overlay-560-200-x12.dtbo;./arch/arm/boot/dts/stm32mp157c-dhcom-pdk2-overlay-638-100-x12-rpi7inch.dtbo

RS-485 device

DHCOM UART 2	`/dev/ttySTM2`

Compilation on target

`gcc tty_rs485_test.c -o tty_rs485_test`

Set tty device to raw mode

`stty -F /dev/ttySTM2 115200 cs8 raw -echo`

Send data with demo program

./tty_rs485_test /dev/ttySTM2

Receive data with demo program

`./tty_rs485_test /dev/ttySTM2`

Download example source code

Setup CAN interface with baudrate 500kbit/sec.

`ip link set can0 up type can bitrate 500000`

Start to listen on CAN port

`candump can0`

Send test message

`cansend can0 100#11.2233.44556677.88`

Deinitialize CAN port

`ip link set can0 down`