First step

Flash firmware

Connect LR1121 shield to STM32L476RG, and connect STM32L476RG to PC by USB cable, then follow these 2 steps to flash the firmware:

• flash STM32L476RG with lr11xx-updater-tool_v2.5.1_modem_v2.0.1.bin, it will update the LR1121 firmware.
• flash STM32L476RG with Modem-E-interpreter-STM32L476-v0.7.3.bin, it will update the MicroPython firmware with this tool embedded inside.

You can drag and drop the firmware to the popup Window in your OS, or use tool STM32CubeProgrammer to upgrade it.

Usage

Open your terminal tool (such as Putty) on PC, press the reset button of the STM32L476RG, and this tool automatically runs.

It will show below information to guide the user about how to use it:

status: 0x02 = 0b10
        - Reset after panic

Welcome to use Modem-E Command Interpreter (v0.7.3).

Please input 'help' for the usage.
Input 'list_cmds' to see all supported commands.
Or use 'find' to search commands.

>>

Now you can start to input commands and read back results.