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        • C
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      • PIC32
        • C
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        • Basic
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        • Pascal
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        • Additional Software
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      • ARM
        • C
          • NECTO Studio
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        • Basic
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        • Additional Software
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          • Visual TFT
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      • AVR
        • C
          • NECTO Studio
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        • Basic
          • mikroBasic PRO for AVR
        • Pascal
          • mikroPascal PRO for AVR
        • Additional Software
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          • Visual TFT
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          • Package Manager
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      • FT90x
        • C
          • mikroC PRO for FT90x
        • Basic
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        • Pascal
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        • Additional Software
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          • Visual TFT
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          • CAN calculator
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          • Timer Calculator
          • MikroPlot
      • 8051
        • C
          • mikroC PRO for 8051
        • Basic
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        • Pascal
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        • Additional Software
          • CODEGRIP WiFi license
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          • Visual TFT
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          • CAN calculator
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          • MikroPlot
    • Dev Boards
      • PIC (8-bit)
        • 8th Generation
          • Fusion for PIC v8
          • EasyPIC PRO v8
          • EasyPIC PRO v8 over USB-C
          • EasyPIC v8
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          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyPIC PRO v7a
          • PICPLC16 v7a
          • EasyPIC v7a
          • EasyPIC PRO v7
          • EasyPIC v7
        • 6th Generation
          • PICPLC16 v6
      • dsPIC/PIC24 (16-bit)
        • 8th Generation
          • EasyPIC v8 PIC24/dsPIC33
          • EasyPIC v8 for dsPIC30
          • EasyPIC v8 for dsPIC30 over USB-C
          • Fusion for PIC v8
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyPIC Fusion v7
          • EasyPIC v7 for dsPIC30
        • 6th Generation
          • Easy24-33 v6
      • PIC32 (32-bit)
        • 8th Generation
          • Fusion for PIC32
          • Fusion for PIC32 over USB-C
          • Fusion for PIC v8
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyPIC Fusion v7
      • ARM (32-bit)
        • 8th Generation
          • Fusion for ARM v8
          • Fusion for ARM v8 over USB-C
          • Fusion for STM32 v8
          • Fusion for STM32 over USB-C
          • Fusion for KINETIS v8
          • Fusion for Kinetis v8 over USB-C
          • Fusion for TIVA v8
          • Fusion for TIVA v8 over USB-C
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyMx PRO v7a STM32
          • EasyMx PRO v7 STM32
          • EasyMx PRO v7 Tiva
      • AVR (8-bit)
        • 8th Generation
          • EasyAVR PRO v8
          • EasyAVR PRO v8 over USB-C
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyAVR v7
        • 6th Generation
          • AVRPLC16 v6
      • 8051 (8-bit)
        • 7th generation
          • BIG8051
        • 6th Generation
          • Easy8051 v6
      • PSoC (8-bit)
        • 6th Generation
          • UNI-DS6 Development System
      • RISC-V (32bit)
        • 8th Generation
          • UNI-DS v8
          • UNI-DS v8 over USB-C
      • Universal Boards
        • 8th Generation
          • UNI-DS v8
          • UNI-DS v8 over USB-C
          • Fusion for PIC v8
          • Fusion for ARM v8
        • 7th Generation
          • EasyPIC Fusion v7
        • 6th Generation
          • UNI-DS6
          • mikroBoard for PIC 80-pin
          • mikroBoard for AVR
          • mikroBoard for dsPIC
          • mikroBoard for PSoC
          • mikroBoard for 8051
          • mikroBoard for PIC 40-pin
          • mikroBoard for ARM
          • mikroBoard for ARM 144-pin
      • IoT - Wearable
        • Hexiwear
          • Hexiwear
          • Hexiwear Power User Pack
          • Hexiwear Docking Station
          • Hexiwear Battery Pack
          • Hexiwear Color Pack
          • Hexiwear Workstation
      • Analog Boards
        • 7th Generation
          • Analog System Lab Kit PRO
    • Starter Boards
      • PIC (8-bit)
        • Clicker
          • PIC clicker
        • Clicker 2
          • Clicker 2 for PIC18FJ
          • Clicker 2 for PIC18FK
        • Clicker 4
          • UNI Clicker
        • Ready
          • Ready for PIC Board
          • Ready for PIC (DIP28)
          • PIC-Ready2 Board
          • MMC Ready Board
        • StartUSB
          • StartUSB for PIC
      • dsPIC/PIC24 (16-bit)
        • Clicker 2
          • Clicker 2 for PIC24
          • Clicker 2 for dsPIC33
        • Clicker 4
          • UNI Clicker
        • Ready
          • dsPIC-Ready1 Board
          • dsPIC-Ready2 Board
          • DsPIC-Ready3 Board
          • dsPIC-Ready4 Board
      • PIC32 (32-bit)
        • Clicker
          • PIC32MX clicker
          • 6LoWPAN Clicker
          • PIC32MZ clicker
        • Clicker 2
          • Clicker 2 for PIC32MX
          • Clicker 2 for PIC32MZ
        • Clicker 4
          • UNI Clicker
        • MINI
          • MINI-32 Board
          • MINI-32 for PIC32MZ
        • Flip&Click
          • Flip&Click PIC32MZ
      • ARM (32-bit)
        • Clicker
          • RA4M1 Clicker
          • Kinetis Clicker
          • MSP432 Clicker
          • CEC1702 clicker
          • CEC1302 Clicker
          • STM32 M4 clicker
        • Clicker 2
          • Clicker 2 for STM32
          • Clicker 2 for Kinetis
          • Clicker 2 for CEC1702
          • Clicker 2 for MSP432
          • Clicker 2 for CEC1302
          • Clicker 2 for PSoC 6
        • Clicker 4
          • Clicker 4 for TMPM4K
          • Clicker 4 for STM32
          • UNI Clicker
        • MINI
          • MINI-M4 for STM32
          • MINI-M4 For Kinetis
          • MINI-M4 for Tiva
          • MINI-M4 for Stellaris
          • MINI-M4 for MSP432
          • MINI-M0 for STM32
        • Flip&Click
          • Flip&Click SAM3X
      • AVR (8-bit)
        • Clicker 4
          • UNI Clicker
        • MINI
          • MINI-AT Board - 3.3V
          • MINI-AT Board - 5V
        • Ready
          • Ready for AVR Board
          • Ready For XMEGA
          • mikroXMEGA Board
          • AVR-Ready2 Board
        • StartUSB
          • StartUSB for AVR
      • 8051 (8-bit)
        • Clicker 4
          • UNI Clicker
        • Ready
          • 8051-Ready Board
      • FT90x (32-bit)
        • Clicker 2
          • Clicker 2 for FT90x
      • Miscellaneous
        • USB
          • USB Wizard
          • Quail
          • FlowPaw Kit
      • Universal Boards
        • Clicker 4
          • UNI Clicker
    • Prog-Debug
      • PIC (8-bit)
        • CODEGRIP
          • UNI CODEGRIP
          • UNI CODEGRIP - USB-C
          • CODEGRIP for PIC
          • CODEGRIP for PIC USB-C
        • mikroProg
          • mikroProg for PIC
      • dsPIC/PIC24 (16-bit)
        • CODEGRIP
          • UNI CODEGRIP
          • UNI CODEGRIP - USB-C
          • CODEGRIP for PIC
        • mikroProg
          • mikroProg for dsPIC
      • PIC32 (32-bit)
        • CODEGRIP
          • UNI CODEGRIP
          • UNI CODEGRIP - USB-C
          • CODEGRIP for PIC
          • CODEGRIP for PIC USB-C
        • mikroProg
          • mikroProg for PIC32
      • ARM (32-bit)
        • CODEGRIP
          • UNI CODEGRIP
          • UNI CODEGRIP USB-C
          • CODEGRIP for ARM
          • CODEGRIP for ARM USB-C
          • CODEGRIP for STM32
          • CODEGRIP for KINETIS
          • CODEGRIP for Tiva
          • CODEGRIP for Tiva USB-C
        • mikroProg
          • mikroProg for STM32
          • mikroProg for Tiva
          • mikroProg for Kinetis
          • mikroProg for CEC
          • mikroProg for MSP432
          • mikroProg for PSoC 5LP
      • AVR (8-bit)
        • CODEGRIP
          • CODEGRIP for AVR
          • CODEGRIP for AVR - USB-C
          • UNI CODEGRIP
          • UNI CODEGRIP - USB-C
        • mikroProg
          • mikroProg for AVR
      • 8051 (8-bit)
        • mikroProg
          • mikroProg for 8051
      • FT90x (32-bit)
        • mikroProg
          • mikroProg for FT90x
    • Smart Displays
      • 2.8"
        • ARM (32-bit)
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        • dsPIC/PIC24 (16-bit)
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      • 3.5"
        • ARM (32-bit)
        • FT90x (32-bit)
        • PIC (8-bit)
        • PIC32 (32-bit)
      • 4.3"
        • ARM (32-bit)
        • FT90x (32-bit)
        • PIC (8-bit)
        • PIC32 (32-bit)
      • 5"
        • ARM (32-bit)
        • FT90x (32-bit)
        • PIC32 (32-bit)
      • 7"
        • ARM (32-bit)
        • FT90x (32-bit)
    • MCU Cards
      • PIC (8-bit)
        • 8th Generation
        • 7th Generation
        • 6th Generation
      • dsPIC/PIC24 (16-bit)
        • 8th Generation
        • 7th Generation
        • 6th Generation
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        • 8th Generation
        • 7th Generation
      • ARM (32-bit)
        • 8th Generation
        • 7th Generation
      • AVR (8-bit)
        • 8th Generation
      • RISC-V (32bit)
        • 8th Generation
    • Accessories
      • TFT Displays
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      • ARM
        • mikroLab Kits
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          • mikroLAB for Tiva
        • EasyStart Kits
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        • TFT Designer Kits
          • TFT 3" - TIVA
          • TFT 4" - STM32F4
          • TFT 5" - TIVA
          • TFT 7" - STM32F4
          • TFT 3" - STM32 M3
          • TFT 3" - STM32 M4
        • TFT Developer Kits
          • TFT 3" - TIVA
          • TFT 3" - STM32F3
          • TFT 3" - STM32F4
        • TFT Professional Kits
          • TFT 5 Pro Kit - TIVA
          • TFT 7 Pro Kit - STM32F4
          • TFT Plus Pro Kit - STM32F4
      • PIC32
        • mikroLab Kits
          • mikroLAB for PIC32
        • EasyStart Kits
          • EasyStart Kit - PIC32MX4
          • EasyStart Kit - PIC32MX7
        • TFT Designer Kits
          • TFT 3" - PIC32MX4
          • TFT 4" - PIC32MX7
        • TFT Developer Kits
          • TFT 3" - PIC32MX4
        • Home Automation
          • AWS Home
      • dsPIC/PIC24
        • mikroLab Kits
          • mikroLAB for dsPIC
          • mikroLAB for dsPIC L
          • mikroLAB for dsPIC XL
        • EasyStart Kits
          • EasyStart Kit - dsPIC33FJ
          • EasyStart Kit - dsPIC33EP
          • EasyStart Kit - PIC24EP
          • Easy Start Kit - dsPIC30
        • TFT Designer Kits
          • TFT 3" - dsPIC33FJ
          • TFT 3" - dsPIC33EP
          • TFT 3" - PIC24EP
          • TFT 3" - PIC24FJ
        • TFT Developer Kits
          • TFT 3" - dsPIC33FJ
          • TFT 3" - PIC24FJ
          • TFT 3" - PIC24EP
          • TFT 3" - dsPIC33EP
      • AVR
        • mikroLab Kits
          • mikroLAB for AVR
          • mikroLAB for AVR L
          • mikroLAB for AVR XL
        • EasyStart Kits
          • Easy Start Kit - AVR
        • TFT Designer Kits
          • TFT Designer kit - XMEGA
        • TFT Developer Kits
          • TFT Developer kit - XMEGA
      • 8051
        • mikroLab Kits
          • mikroLAB for 8051 L
          • mikroLAB for 8051
        • EasyStart Kits
          • Easy Start Kit - 8051
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MikroElektronika white logo
  • Products
    • click boards icon Click Boards
      • Wireless Connectivity
        • GPS/GNSS
        • GSM/LTE
        • LTE IoT
        • BT/BLE
        • WiFi
        • RFID/NFC
        • GSM+GPS
        • 6LoWPAN
        • ZigBee
        • UWB
        • SigFox
        • Sub-1 GHz Transceievers
        • 2.4 GHz Trancevers
        • LoRa
      • Sensors
        • Biometrics
        • Gas
        • Magnetic
        • Motion
        • Optical
        • Pressure
        • Proximity
        • Temperature & humidity
        • Current sensor
        • Miscellaneous
        • Environmental
        • Force
        • Inductance
        • RF meter
        • Click Shields
        • Click Bundles
      • Interface
        • Adapter
        • CAN
        • Port expander
        • RS485
        • USB
        • 1-Wire
        • RS232
        • Ethernet
        • LIN
        • PWM
        • Current
        • DALI
        • I2C
        • Fiber optics
        • SPI
        • DMX
        • CXPI
        • Click Shields
        • Click Bundles
      • Display & LED
        • LED Drivers
        • LED Matrix
        • LED Segment
        • OLED
        • LCD
        • Click Shields
        • Click Bundles
      • Miscellaneous
        • Relay
        • Optocoupler
        • ID
        • Proto
        • Encryption
        • Click Shields
        • Click Bundles
      • Mixed Signal
        • ADC
        • Measurements
        • DAC
        • Digital potentiometer
        • ADC-DAC
        • Click Shields
        • Click Bundles
      • Storage
        • EEPROM
        • FLASH
        • FRAM
        • microSD
        • MRAM
        • SRAM
        • EERAM
        • ReRAM
        • DRAM
        • Click Shields
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      • Motor Control
        • Brushed
        • Brushless
        • Servo
        • Stepper
        • Click Shields
        • Click Bundles
      • Audio & Voice
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        • Speakers
        • Signal Processing
        • Speech recognition
        • FM
        • MP3
        • Click Shields
        • Click Bundles
      • HMI
        • Capacitive
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        • Haptic
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    • necto icon NECTO
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    • compilers icon Compilers
      • PIC
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        • Additional Software
          • CODEGRIP WiFi license
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          • Visual TFT
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      • dsPIC/PIC24
        • C
          • NECTO Studio
          • mikroC PRO for dsPIC
        • Basic
          • mikroBasic PRO for dsPIC
        • Pascal
          • mikroPascal PRO for dsPIC
        • Additional Software
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          • Visual TFT
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          • MikroPlot
      • PIC32
        • C
          • NECTO Studio
          • mikroC PRO for PIC32
        • Basic
          • mikroBasic PRO for PIC32
        • Pascal
          • mikroPascal PRO for PIC32
        • Additional Software
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          • Visual TFT
          • Visual GLCD
          • Package Manager
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          • Timer Calculator
          • MikroPlot
      • ARM
        • C
          • NECTO Studio
          • mikroC PRO for ARM
        • Basic
          • mikroBasic PRO for ARM
        • Pascal
          • mikroPascal PRO for ARM
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual TFT AI
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • AVR
        • C
          • NECTO Studio
          • mikroC PRO for AVR
        • Basic
          • mikroBasic PRO for AVR
        • Pascal
          • mikroPascal PRO for AVR
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • FT90x
        • C
          • mikroC PRO for FT90x
        • Basic
          • mikroBasic PRO for FT90x
        • Pascal
          • mikroPascal PRO for FT90x
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • 8051
        • C
          • mikroC PRO for 8051
        • Basic
          • mikroBasic PRO for 8051
        • Pascal
          • mikroPascal PRO for 8051
        • Additional Software
          • CODEGRIP WiFi license
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          • Visual TFT
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          • Package Manager
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          • CAN calculator
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          • MikroPlot
    • dev boards icon Dev Boards
      • PIC (8-bit)
        • 8th Generation
          • Fusion for PIC v8
          • EasyPIC PRO v8
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  1. Home
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  3. BLUETOOTH LOW ENERGY – PART 4: BLE 3 click

BLUETOOTH LOW ENERGY – PART 4: BLE 3 click

Published: 08/11/2016 | Post categories: Learn, RF Technologies & IOT

| Views:8891

BLUETOOTH LOW ENERGY – PART 4: BLE 3 click

Bluetooth low energy is becoming one of the most popular radio protocols for low power devices. Several sensors can all communicate to a central tablet/pc/smartphone very efficiently using BLE. This makes BLE very useful for creating a controlled environment full of embedded devices: every engineer's dream. The first of such radio devices implemented in our click boards was the BLE P click, carrying Nordic's nRF8001, it had to have the whole protocol stack implemented on the MCU. The second one was BLE 2 click, with Microchip's RN4020. BLE 2 had the whole protocol stack written on the chip itself and could act both as a central and peripheral device. Couple UART string commands were all it took to set it up.

Now we have reached to the third installment to our BLE category: meet the BLE 3 click!

BLE 3 click board BLE 3 click board

Basic overview

BLE 3 click carries the NINA-B1 module made by u-blox. The module is very flexible, as it is able to communicate with a host MCU by either UART, SPI or I2C. The protocol stack is also implemented in the chip itself, so you don't need to worry about writing one yourself. A big thank you goes to the firmware developers at u-blox who made this happen. Along with the protocol stack, the chip has a built-in default profile, as well as a couple different operating modes.

Before we get down to code and examples, let's refresh our memory about BLE for a minute.

BLE Basics: The GATT

In the first part of our BLE tutorials, I have covered how the BLE protocol works. We have gone through all the layers which form this communication, and how they are implemented. If you want to refresh your memory, feel free to take another look at our introduction to BLE.

For the sake of implementing an example with BLE 3 click, we will talk here only about the GATT layer of BLE.

As you recall, the Generic Attribute layer consists of services and characteristics. Each service consists of several characteristics, each characteristic contains user data and descriptive data (metadata). Several services, with their characteristics, make up a GATT profile. The profile, as is, does not really exist, it's just a predefined number of services with their characteristics. Services and characteristics can be distinguished by their unique UUIDs. This is very important for when our tablet/pc/smartphone will search for a specific characteristic of our BLE 3 click.

The Serial Port Service

The firmware inside the BLE 3 click board has a default GATT profile, which contains a default service named "Serial Port Service". This service is used to emulate an asynchronous communication between the click and another BLE devices. So how does it work?

The service contains a FIFO characteristic. Data between the two BLE devices is being transmitted using this characteristic. When BLE 3 click writes data to this characteristic, our smartphone will be notified with the new value of the characteristic. But, the smartphone can also write to the same FIFO characteristic, therefore, once the smartphone writes a new value to the characteristic, BLE 3 click will be notified about the change. As simple as that.

More about the Serial Port Service can be found here.

Implementing the communication

Now that we have all the basics covered, we can make a simple example: an MCU and a smartphone will establish a connection, the MCU will constantly send data about the status of a couple of pins from one of its ports. The smartphone can read this data, and can write a new value. Once the BLE 3 click receives this value, it will set the port to that exact value, which can be monitored with a couple of LED's.

The MCU side

First we will set up the BLE 3 click to advertise our data. The click uses hardware flow control, so we have to be wary about RTS and CTS pins, as well as one reset (RST) pin.

When our little example program starts, we will pull the RST pin high, which will reset our click board. After that, we will send the appropriate string commands over UART. We will set up the BLE 3 to work in data mode. What this means is that, once in data mode, every byte received from UART, the BLE 3 will send it over the air. Similar thing with receiving data, once BLE 3 click receives a new byte of data from the smartphone, everything will be sent over UART to our MCU. The MCU will constantly read the value of a port, increment it, and send the value through UART to BLE 3. The BLE 3 will set this value to the FIFO characteristic of the Serial Port Service. If a smartphone changes this value, BLE 3 will send the new value over UART to the MCU, we will catch this value in an UART interrupt and set it as the value of our port.

#include 
#include 

sbit BLE3_RTS_MCU at GPIOD_IDR.B13;
sbit BLE3_CTS_MCU at GPIOD_ODR.B10;
sbit BLE3_RST     at  GPIOC_ODR.B2;


uint16_t porte_read = 0;

void main()
{

    GPIO_Digital_Input( &GPIOD_BASE, _GPIO_PINMASK_10 );
    GPIO_Digital_Output( &GPIOD_BASE, _GPIO_PINMASK_13 );
    GPIO_Digital_Output ( &GPIOC_BASE, _GPIO_PINMASK_2 );
    GPIO_Digital_Output(&GPIOE_BASE, _GPIO_PINMASK_ALL); // Set PORTE as digital output

    UART3_Init_Advanced( 115200, _UART_8_BIT_DATA,       // Initialize UART
                                _UART_NOPARITY,
                                _UART_ONE_STOPBIT,
                                &_GPIO_MODULE_USART3_PD89);
    delay_ms(500);

    BLE3_RTS_MCU = 0;            // set RTS to 0
    BLE3_RST = 1;                // pull reset pin high
    delay_ms(2000);
    
    Uart3_Write_Text("AT+UBTLN=");   // set the device name to "mikroE"
    Uart3_Write_Text(""mikroE"");
    Uart3_Write_Text("r");

    delay_ms(2000);

    Uart3_Write_Text("ATO1r");   // set BLE 3 into data mode, all bytes sent from UART will be sent over BLE
    delay_ms(1000);               // all bytes received from BLE will be sent to UART

    
    RXNEIE_USART3_CR1_bit = 1;           // setup UART interrupt
    NVIC_IntEnable( IVT_INT_USART3 );
    EnableInterrupts();

    while(1)
    {
         GPIOE_ODR = porte_read << 8;
         Uart3_Write(porte_read);        // send the updated value of the PORT over BLE
         delay_ms(1000);
         porte_read++;
    }

}

// if smartphone/tablet writes to BLE 3, update the port with the value sent from the smartphone/tablet

void LO_RX_ISR() iv IVT_INT_USART3 ics ICS_AUTO
{
    if( RXNE_USART3_SR_bit )
    {
        porte_read = USART3_DR;
    }
}

 

The smartphone/tablet/pc side

Once our MCU side is configured, we can jump to our smartphone side. If you don't have the BLE Scanner application downloaded, you can find it here.
Once you start the application, it will scan for all nearby available BLE devices. Our device will be named "mikroE". If you have found it, feel free to press "connect"

Scanned devices in BLE Scanner app Scanned devices in BLE Scanner app

Once connected, the application will list you all available services and characteristics. The Serial Port Service will be shown as a custom service. Once you press on it, you will see two custom characteristics, the FIFO characteristic is the first one listed, with the following UUID: 0x2456e1b926e28f83e744f34f01e9d703

Now that you have found the FIFO characteristic, if you press the button "N", you will enable notifications for this characteristic. Which means that the value of this characteristic will update as soon as it is changed, you don't have to read it manually. Once notifications are enabled, you can also write to this characteristic by pressing "W" and entering a byte array. This byte array will then be forwarded from BLE 3 to our MCU through UART, and set as the value of our port.

Discovering the services and characteristics Discovering the services and characteristics

And that's it, your smartphone and the BLE 3 click are communicating! This is a small example which can take you a long way. The FIFO characteristic can be used for all sorts of data, from heart rate to environmental temperature, notify your smartphone from a MCU in no time with the our newest Bluetooth Low Energy module!

The code for BLE 3 example can be found here.

References

wikipedia.org "Bluetooth Low Energy" wikipedia 2016

wikipedia.org "Flow control (data) " wikipedia 2016

u-blox

Nordic semiconductors

Microchip

Libstock

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