Install Low Power Apache Mynewt and Embedded Rust for STM32 Blue Pill and Visual Studio Code on Windows

Follow these instructions to install Low Power Apache Mynewt + Embedded Rust build and application files for Visual Studio Code on Windows for the article Low Power NB-IoT on STM32 Blue Pill with Apache Mynewt and Embedded Rust

Install Rust

1️⃣ Click here to install Build Tools For Visual Studio 2019:

2️⃣ Click the Individual Components tab

Select the following components:

  1. Windows 10 SDK (10.0.18362.0)
  2. C++ CMake Tools for Windows
  3. (This should be automatically selected) MSVC v142 — VS 2019 C++ x64/x86 Build Tools

3️⃣ Install rustup according to the instructions here:

Click the link provided to download rustup‑init.exe

Launch the downloaded file rustup‑init.exe

If you see the message “Windows Defender SmartScreen prevented an unrecognised app from starting”…

Click More Info

Click Run Anyway

4️⃣ At the Welcome to Rust! prompt, press Enter to select the default option:
1) Proceed with installation (default)

5️⃣ Open the Windows Command Prompt. Enter into the command prompt:

rustup default nightly
rustup update
rustup target add thumbv7m-none-eabi
rustup target add thumbv7em-none-eabihf
rustc -V

The reported version of rustc should be 1.38.0 or later:

rustc 1.38.0-nightly (435236b88 2019–08–01)

Install Source Files and Build The Firmware

1️⃣ Download the stm32bluepill-mynewt-sensor.7z file attached below…

Expand the .7z file with 7zip…

2️⃣ Install Arm Cross-Compiler and Linker for Windows from Arm Developer Website…,32-bit,,Windows,8-2019-q3-update

Select this option at the last install step:
"Add path to environment variable"

3️⃣ Download the ST-Link USB driver from ST-Link Driver Website (email registration required)…

Click Get Software
Unzip the downloaded file. Double-click the driver installer:

4️⃣ Install Windows Studio Code:

Launch Visual Studio Code

Install the extension “Cortex-Debug”…

5️⃣ Click File → Open Folder
Select the downloaded folder stm32bluepill-mynewt-sensor

When prompted to open the workspace, click Open Workspace

Quectel NB-IoT module

6️⃣ If you have a Quectel NB-IoT module…

Open the following file and configure the program settings:

Change the NB-IoT band setting NBIOT_BAND. Check with your NB-IoT operator for the band to use. The other settings are documented below.

7️⃣ Click Terminal → Run Task → [1] Build bluepill_boot
This builds the bootloader, which starts the Apache Mynewt operating system upon startup. If it shows errors, compare with this build log.

Click Terminal → Run Task → [2] Build bluepill_my_sensor
This builds the firmware containing our Rust program. Compare with this build log.

When our Rust program has been successfully compiled as Blue Pill ROM firmware, we should see this…

Click Terminal → Run Task → [3] Image bluepill_my_sensor
This creates the Blue Pill flash image from the firmware. Compare with this image log.

If any source files or configuration files are changed, rebuild the application by clicking Terminal → Run Task → [2] Build bluepill_my_sensor

Flash The Firmware To Blue Pill

The next step is to flash the firmware into Blue Pill’s ROM. We’ll need to connect the Blue Pill to the USB port of our computer via an ST-Link V2 adapter.

Blue Pill and ST-Link connected to USB port

1️⃣ Check that the Blue Pill is connected to ST-Link…

And the ST-Link is connected to your computer’s USB port.

Now let’s head back to Visual Studio Code…

2️⃣ Click Terminal → Run Task → [4] Load bluepill_boot

This flashes the bootloader to Blue Pill, to start the Apache Mynewt operating system upon startup. If it shows errors, compare with this flash log.

3️⃣ Click Terminal → Run Task → [5] Load bluepill_my_sensor

This flashes the firmware (containing our Visual Program) to Blue Pill. If it shows errors, compare with this flash log.

Run The Program

1️⃣ Click Debug → Start Debugging

2️⃣ Click View → Output

Select Adapter Output to see the Blue Pill log

3️⃣ The debugger pauses at the line with LoopCopyDataInit

Click Continue or press F5

4️⃣ The debugger pauses next at the main() function.

Click Continue or press F5

The log should look like this.

To monitor the power consumption, disconnect the ST-Link and connect Blue Pill to the RuiDeng DPS 3005 Power Monitor as described in the article.

On power up, Blue Pill will automatically start the Mynewt Stub Bootloader and jump to our Rust application.

Rust Source Files

The Rust source files are located in the rust folder…

rust/app: Rust application that polls the internal temperature sensor and transmits the sensor data over NB-IoT

rust/visual: Sample Visual Embedded Rust program. Not used in this tutorial.

rust/mynewt: Rust Safe Wrappers for Mynewt OS and libraries

rust/macros: Rust Procedural Macros for generating Safe Wrappers and other utility macros like strn!()

Optional: Install Rust Language Server

To get full Rust Language Support for editing Rust source files in Visual Studio Code, you may install Rust Language Server

1️⃣ In Visual Studio Code, browse to a Rust file like rust/app/src/

2️⃣ When prompted to install RLS, click Yes

3️⃣ Good Luck! Sometimes the RLS installation fails with this message because we are using the nightly build…

Optional: Program Settings

The program settings may be found in the file

COAP_HOST, COAP_PORT: The program will send CoAP messages to this IP address and port number, which defaults to the CoAP server at

Keep the default settings if you wish to view your sensor data at

Change the setting to use your own CoAP server instead of

COAP_URI: The CoAP message will be delivered to this URI at the CoAP server (which defaults to

Keep the default settings if you wish to view your sensor data at

For, the last part IVRi… is the Thing Token. If you wish to send sensor data to your own Thing at, replace the last part of the URI with your Thing Token.

For the purpose of NB-IoT Education, I’ll allow you to transmit sensor data to the Thing Token IVRi… from my personal, paid account. Which will forward the sensor data to for viewing.

NBIOT_BAND: The program connects to this NB-IoT Frequency Band. The Frequency Band depends on your country and your NB-IoT network operator. Check with your NB-IoT network operator for the Frequency Band to use.