Running system on armv7m4-stm32l4x6-nucleo#

This version is designated for STM32L4x6 processors with Cortex-M4 core. To launch this version the final flash image should be provided. The image is created as the final artifact of the phoenix-rtos-project building and is located in the _boot directory. The image consists of a kernel, TTY UART driver, RAM disk filesystem, and psh (shell).

See how to build the Phoenix-RTOS system image.

Development board#

The easiest way to start programming hardware targets using Phoenix-RTOS is to get some of the evaluation boards with a specified target processor or microcontroller.

In this case NUCLEO-L4A6ZG is the example of a board with stm32l4x6 microcontroller.

Connecting the board#

To provide a power supply for the board and make flashing possible, you have to connect a USB to micro USB cable between your host pc and the development board (USB PWR port, also called CN1).

To communicate with the board you will need to use a UART-USB converter, like PL2303 TA.

Connect TX, RX, and GND wires to the USART2 (called also USART_B) in the Nucleo board. For example, using PL2303 TA:
- PL2303 TX (green) - Nucleo USART_B_RX
- PL2303 RX (white) - Nucleo USART_B_TX
- PL2303 GND (black) - Nucleo GND
Source: The Nucleo board’s schematic, available on https://www.st.com/en/evaluation-tools/nucleo-l4a6zg.html#cad-resources
Put the converter into your host PC’s USB port

The picture below presents how the board should be connected:
Now you should verify, what USB device on your host-pc is connected with the UART (console). To check that run:
- On Ubuntu:
```
  ls -l /dev/serial/by-id
```
- On macOS:
```
ls -l /dev/tty.*
```
Open serial port in terminal using picocom
```
picocom -b 115200 --imap lfcrlf /dev/tty[port]
```
How to get picocom and run it without privileges (Ubuntu 22.04)
```
sudo apt update && \
sudo apt install -y picocom
```
To use picocom without sudo privileges run this command and then restart:
```
sudo usermod -a -G tty <yourname>
```
How to get picocom (macOS)
```
brew update &&\
brew install picocom
```

You can leave the terminal with the serial port open, and follow the next steps.

Flashing the Phoenix-RTOS system image#

To flash the image to the board you will need openocd in version 0.11 or 0.12. You can check it using

openocd -v

How to get openocd on Ubuntu

To install from the default repositoriy:

use apt
```
sudo apt install -y openocd
```
check if the version is correct
```
openocd -v
```

If you encounter errors install manually from sources (v0.12.0):

download, build and install openocd-0.12.0-1 from sources

wget -O- https://launchpad.net/ubuntu/+archive/primary/+sourcefiles/openocd/0.12.0-1build2/openocd_0.12.0.orig.tar.bz2 | \
sudo tar xjvf - -C /usr/local/src && \
cd /usr/local/src/openocd-0.12.0 && \
sudo apt install -y pkg-config \
libusb-1.0-0-dev && \
./configure --enable-stlink && \
make && \
sudo make install

check if the version is correct
```
openocd -v
```

How to get openocd (macOS)

install openocd
```
brew update &&\
brew install open-ocd
```
check if the version is correct
```
openocd -v
```

If you have openocd, next you can use the following script:

sudo phoenix-rtos-build/scripts/program-stm32l4x6.sh _boot/armv7m4-stm32l4x6-nucleo/phoenix.disk

or use openocd directly:

openocd -f interface/stlink.cfg \
-f target/stm32l4x.cfg -c "reset_config srst_only srst_nogate connect_assert_srst" \
-c "program _boot/armv7m4-stm32l4x6-nucleo/phoenix.disk 0x08000000 verify reset exit"