HM-10 BTLE example for theCore embedded C++ framework

This example demonstrates using of HM-10 Bluetooth module using theCore. With Bluetooth application on Android device it is possible to establish communication link between the smartphone and any embedded device with HM-10 attached.

Detailed description

See theCore documentation for HM-10 Bluetooth example for more information.

Supported targets (boards)

Target name	Configuration file	Description
stm32f4_disc	stm32f4_discovery.json	STM32F4 discovery board

Wiring

STM32F4 Discovery board

1. Connect USART2 and power to HM-10 on the Discovery board using following pins:

   PA2 (USART2 TX)	module's RX
   PA3 (USART2 RX)	module's TX
   +3.3V	module's VDD
   GND	module's GND

2. Attach any preferable UART-to-USB converter such as this module according to following pinout:

   PD8 (USART3 TX)	module's RX
   PD9 (USART3 RX)	module's TX
   GND	module's GND

Installing additional software on Android smartphone

To be able to communicate with HM-10 module via Android smartphone, a special application must be installed.

Open Play Store and find BLE Terminal app. Install it as usual.

Preparing

1. Install and initialize theCore (if not done previously):

   pip3 install tcore
   tcore bootstrap
   

2. Download the example:

   tcore init --remote https://github.com/theCore-embedded/example_hm10_bluetooth
   

3. Step into the project directory:

   cd example_hm10_bluetooth
   

Building

tcore compile --target tiva_tm4c_launchpad

Running

1. Launch minicom with device associated with USB <-> UART converter. (/dev/ttyUSB0 here used as an example):

   # From new terminal
   tcore runenv "minicom -D /dev/ttyUSB0"
   

   Or the same, but with superuser permissions:

   # From new terminal
   tcore runenv --sudo "minicom -D /dev/ttyUSB0"
   

2. Determine stm32f4discovery board revision.

   If you don't remember your board revision, check FAQ section https://forgge.github.io/theCore/faq.html#how-to-check-stm32f4-discovery-board-revision.html

3. Launch flash command in separate terminal, as shown below.

   For old STM32F407G-DISC boards, with STLINK/V2:

   tcore flash --sudo
   

   For new STM32F407G-DISC1 boards, with STLINK/V2.1:

   tcore flash --sudo --debugger-config stlink-v2.1
   

4. Check minicom terminal. You should be able to see:

   Welcome to theCore
   the_core v0.3.236 b9c05be-dirty
   Starting HM-10 Bluetooth example...
   Bytes sent: 16
   Bytes received: 0
   Bytes sent: 16
   Bytes received: 0
   Bytes sent: 16
   Bytes received: 0
   

5. Open BLE Terminal on your smartphone. You must be able to see nearby BT devices:

   

6. Select HM-10 device.

7. You will be presented with a terminal window where the data sent from device is displayed

8. Now, type something to the terminal prompt in BLE Terminal app and tap "Send ASCII" button:

   

9. Check minicom terminal again:

   Bytes received: 0
   Bytes sent: 16
   Bytes received: 16
   data in return
   

Found a bug?

Let it out! File an issue or create a pull-request, if you already have an idea how to fix it.