The MultiConnect® Dragonfly offers developers an FCC and carrier certified solution that makes connecting sensors and other edge-of-network devices quick and easy.
Table of Contents
- Dragonfly Pinout Diagram
- Dragonfly Features
- Cellular Stack (MTSCellularInterface)
- Example Programs
- Old Cellular Stack (MTSAS)
- Old Example Programs
- Factory Firmware
- Offline IDE
- MTS Bootloader
- Technical Reference
- Interface Firmware
- Getting Started with mbed
- PC Configuration
- Downloading A program
- Hello World!
- Where Next
The MultiConnect® Dragonfly™ cellular SoMs are complete, ready-to-integrate processing and communications devices that offer developers the functionality of a SoM with the convenience of an onboard cellular radio all in one compact design. With its integrated Cortex M4 processor, developers can host their application and have access to a full suite of interfaces for connecting sensors or other remote assets.
Dragonfly also comes with an ARM mbed compatible software library for even faster development. This powerful suite of hardware and software products greatly reduces your time to market and makes your Internet of Things (IoT) device a reality today.
- Lightweight SoM ideal for most IoT applications
- LTE, HSPA+ and other variants
- GPS/GLONASS support
- Support for multiple interfaces (digital I/O, analog, SPI, I2C and USART)
- Design in or retrofit
- Certified as an end device
- ARM® MBED compatible
- 16 digital I/O pins
- 6 analog pins
- 2 SPI buses
- 2 I2C buses
Offline Development Options
It is possible to develop offline for the Dragonfly using mbed-cli and the Eclipse IDE. See our wiki page for more information.
Developer Kit Required
To program and use the Dragonfly, you will need a UDK2 Developer Kit.
Dragonfly Pinout Diagram¶
The pinout diagram above shows the commonly used interfaces and their locations. In addition to their stated functions, all GPIO pins (PA_*, PB_*, PC_*) can also be used as DigitalIn and DigitalOut interfaces.
Due to the processor's architecture, only one pin of the same number (e.g. PA_1 & PB_1) may be configured as an InterruptIn. If multiple pins of the same number are configured as InterruptIn, only the last pin configured will actually trigger an interrupt in the processor. The rest will be ignored.
PwmOut objects using different channels of the same timer must use the same prescaler value. Each timer has a single prescaler which applies to all channels in the timer.
For STM32F411 devices, two possible prescaler values are allowed:
- 1us which allows for a period/pulse from 1us to 65535us
- 500us which allows for a period/pulse from 500us to 32.76s
5V Tolerant IO Limitations
If the external voltage on a GPIO is greater than VDD + 0.3V, use of the internal pullup or pulldown resistors could damage the mDot. External pullup or pulldown resistors should be used instead.
For more information see the notes below section 6.3.1 of the STM32F411RE Data Sheet.
- STM32F411RET Processor
- High performance ARM® Cortex™-M4 Core
- 96MHz, 128kB RAM, 512kB Flash
- SPI (2)
- I2C (2)
- UART (2) - 1x 8-pin TX/RX/RTS/CTS/DCD/DTR/DSR/RI, 1x 2-pin TX/RX
- PWM (15)
- ADC (12 bit ADC with 12 channels)
- GPIO (up to 31)
- Telit Cellular Radio
- Connected to Processor via UART
- TCP & UDP Sockets
- SMS Messaging
- GPS Location (on some radios)
- 3.3V to 5V external power
- Current (active): < 18 mA
- Current (sleep): < 50 uA
- Maximum of 25 mA output current sourced by any IO pin
- Maximum of 120 mA output current sourced by sum of all IO pins
- All IO pins are 3.3v tolerant
- 29 5V tolerant IO pins (see mDot Pinout Diagram)
- Internal pullup and pulldown resistors cannot be used on 5V tolerant GPIO pins when pin voltage is greater than VDD + 0.3V. See warning box above
Cellular Stack (MTSCellularInterface)¶
The MTSCellularInterface library implements the mbed-os CellularInterface for the cellular radios on MultiTech Dragonfly devices. MTSCellularInterface provides TCP and UDP sockets, SMS messaging capabilities, and GPS location*. After cloning this repository, run the setup script (setup.sh or setup.bat) to generate the version header and clone required dependencies. The library can be cloned from GitHub.
* Not all radios support GPS. GPS location requires a lock on GPS satellites, which may not be possible indoors.
Import our example programs to get up and running quickly and easily, then modify them to create your own solution using the Dragonfly!
Most radios require an APN string to be set before the radio can be used. The APN can be set in the source of the specific example you're using. The SMS example also needs a phone number to send/receive SMS messages to/from.
Example programs for MultiTech Dragonfly devices demonstrating how to use the MultiTech MTSCellularInterface library for cellular radio communication and control.
Old Cellular Stack (MTSAS)¶
This old cellular stack is not compatible with mbed-os. Consider using MTSCellularInterface instead!
Complete library supporting MultiConnect Dragonfly and SocketModem Arduino Shield devices.
Old Example Programs¶
These old example programs use the deprecated MTSAS library which is not compatible with mbed-os. Consider using Dragonfly-Examples and MTSCellularInterface instead!
Send and receive SMS messages using the onboard cellular radio.
Does HTTP GET and POST requests using the onboard cellular radio.
Does HTTPS GET and POST requests using the onboard cellular radio.
The Dragonfly ships from the factory pre-loaded with AT Passthrough Firmware. This firmware implements serial passthrough and provides direct access to the cellular radio via the external serial port on the UDK2. It is available here.
It is possible to compile for the Dragonfly and debug them on the Dragonfly using the Eclipse IDE. See our wiki page for more information.
The Dragonfly includes a bootloader which allows applications to be upgradet OTA (Over The Air) or via serial without the need for a developer board. See the wiki page describing how the bootloader can be used for more information.
- Dragonfly/UDK2 Quick Start Guide
- Dragonfly Datasheet
- Dragonfly Developer Page
- Dragonfly device guides and AT command guides are specific to the radio type and can be found here.
The UDK2 uses the same ST-Link interface firmware as many of the ST Nucleo boards. The latest interface firmware and instructions for upgrading can be found here.
Getting Started with mbed¶
1. Connect your microcontroller to a PC¶
Use the USB lead to connect your mbed to a PC. The status light will come on, indicating it has power. After a few seconds of activity, the PC will recognise the mbed Microcontroller as a standard USB drive.
|Windows XP example||Mac OS X example|
2. Click the MBED.HTM link to get logged in¶
Go to the new USB Drive, and click MBED.HTM to open it in a web browser.
If you do not have an mbed account, choose "Signup", and create your mbed Account. Otherwise, log in with your normal username and password.
This will give you access to the website, tools, libraries and documentation.
Your mbed Microcontroller can appear on your computer as a serial port. On Mac and Linux, this will happen by default. For Windows, you need to install a driver:
Serial Driver for Debug Port on Windows
The DK boards for the mDot require the ST-Link driver to be installed before the debug serial port can be used on Windows PCs. This driver is different from the mbed Windows serial driver.
From a host PC to communicate with mbed you will need a
terminal application. This allows the mbed Microcontroller to print to your PC screen, and for you to send characters back to your mbed.
- Terminals - Using Terminal applications to communicate between the Host PC and the mbed Micrcontroller
Some terminal programs (e.g. TeraTerm) list the available serial ports by name. However, if you do need to know the identity of the serial port so that you can attach a terminal or an application to it:
On both Mac and Linux PCs, the port with the higher number will be the USB serial debug port. For example, if you have Linux and get ports /dev/ttyACM0 and /dev/ttyACM1, ttyACM1 will be the debug port and ttyACM0 the AT command/secondary port.
Downloading A program¶
1. Save a program binary (.bin) to the Platform¶
Download the appropriate "Hello World!" binary:
- MTS_DRAGONFLY_F411RE: mbed-os-example-blinky_mts_dragonfly_f411re.bin
Note: the source code for this program will be seen in the next section.
Save the program binary file to your mbed Microcontroller Disk, just like you would with a normal USB disk. The Status LED will flash as the PC writes the file to the Microcontroller disk. The file is now consumed.
2. Press the Reset Button¶
When the Reset Button in pressed, the microcontroller will be reset and the last programmed application will begin to run.
3. Hello World!¶
The Microcontroller is now running the program; flashing LED1 forever! If you reset the Microcontroller, or disconnect and reconnect the power, the program will simply restart.
This is a very simple guide, reviewing the steps required to get Blinky working on an mbed OS platform.
In its current state, the program will blink the D3 LED on a UDK2 board.
Follow the guide to creating your own programs using the online compiler
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