Uttam Bhat / LoRaWAN-SX1276-Application-Demo

SX1276 Shield based Applications

Dependencies:   X_NUCLEO_IKS01A1 LoRaWAN-lib SX1276Lib mbed

LoRaWAN-SX1276-Application Demo uses SX1276MB1LAS mbed component shield on a nucleo board platform to demonstrate a Class-A LoRaWAN device in the 915MHz ISM band for North American region. It uses the LoRaWAN-lib and SX1276Lib libraries.

Comissioning.h (LoRaWAN Network Configuration)

The end-device can be activated in one of the two ways:

Over the Air (OTA) activation can be enabled as shown in the figure below. /media/uploads/ubhat/ota_enable.png

The end-device must be configured with the following parameters:

  • LORAWAN_DEVICE_EUI (8 Bytes) : Fist 3 Bytes is the Organizationally Unique Identifier (OUI) followed by 5 bytes of unique ID. If not defined by user, then the firmware automatically assigns one to the end-device
  • LORAWAN_APPLICATION_EUI (8 Bytes)
  • LORAWAN_APPLICATION_KEY (or DEVKEY) (16 Bytes)

/media/uploads/ubhat/ota_eui.png

Activation by Personalization (ABP) can be enabled as shown in the figure below. /media/uploads/ubhat/abp_enable.png

The end-device must be configured with the following parameters:

  • LORAWAN_DEVICE_ADDRESS (4 Bytes) : If not defined by user, then the firmware automatically assigns one to the end-device
  • LORAWAN_NWKSKEY (16 Bytes)
  • LORAWAN_APPSKEY (16 Bytes)

/media/uploads/ubhat/abp_key.png

Config.h (LoRaWAN Communication Parameters)

  • Mode of Operation : Hybrid If the end-device needs to be configured to operate over 8-channels, then Hybrid Mode needs to be enabled /media/uploads/ubhat/hybridenable.png
  • Mode of Operation : Frequency Hop If the end-device needs to be configured to operate over 64-channels, then Hybrid Mode needs to be disabled
  • Delay between successive JOIN REQUESTs : The delay between successive Join Requests (until the end-device joins the network) can be configured using the parameter OVER_THE_AIR_ACTIVATION_DUTYCYCLE
  • Inter-Frame Delay : One can change the delay between each frame transmission using APP_TX_DUTYCYCLE It is advisable that APP_TX_DUTYCYCLE is greater than or equal to 3sec.
  • Data Rate : The data rate can be configured as per LoRaWAN specification using the paramter LORAWAN_DEFAULT_DATARATE. The range of values are DR_0, DR_1, DR_2, DR_3 and DR_4
  • Confirmed/Unconfirmed Messages : The uplink message or payload can be chosen to be confirmed or unconfirmed using the parameter LORAWAN_CONFIRMED_MSG_ON. When set to 1, the transmitted messages need to be confirmed with an ACK by the network server in the subsequent RX window. When set to 0, no ACK is requested.
  • ADR ON/OFF : The ADR can be enabled or disabled using the parameter LORAWAN_ADR_ON. When set to 1, ADR is enabled and disabled when set to 0.
  • Application Port : The application port can be set using parameter LORAWAN_APP_PORT. A few examples are associated to specific Application Port, and are defined in Config.h
  • Payload Length : The lenght of the payload (in bytes) to be transmitted can be configured using LORAWAN_APP_DATA_SIZE
  • Transmit Power : The transmit power can be configured using LORAWAN_TX_POWER (LoRaMAC verifies if the set power is compliant with the LoRaWAN spec and FCC guidelines)

/media/uploads/ubhat/loraconfig.png

The baud-rate for serial terminal display is 115200

system/timer.cpp@0:42863a11464a, 2016-08-26 (annotated)

Committer:
ubhat
Date:
Fri Aug 26 19:36:35 2016 +0000
Revision:
0:42863a11464a
SX1276 Shield based Applications

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ubhat 0:42863a11464a 1 /*
ubhat 0:42863a11464a 2 / _____) _ | |
ubhat 0:42863a11464a 3 ( (____ _____ ____ _| |_ _____ ____| |__
ubhat 0:42863a11464a 4 \____ \| ___ | (_ _) ___ |/ ___) _ \
ubhat 0:42863a11464a 5 _____) ) ____| | | || |_| ____( (___| | | |
ubhat 0:42863a11464a 6 (______/|_____)_|_|_| \__)_____)\____)_| |_|
ubhat 0:42863a11464a 7 (C)2013 Semtech
ubhat 0:42863a11464a 8
ubhat 0:42863a11464a 9 Description: Timer objects and scheduling management
ubhat 0:42863a11464a 10
ubhat 0:42863a11464a 11 License: Revised BSD License, see LICENSE.TXT file include in the project
ubhat 0:42863a11464a 12
ubhat 0:42863a11464a 13 Maintainer: Miguel Luis and Gregory Cristian
ubhat 0:42863a11464a 14 */
ubhat 0:42863a11464a 15 #include "board.h"
ubhat 0:42863a11464a 16
ubhat 0:42863a11464a 17 Timer TimeCounter;
ubhat 0:42863a11464a 18 Ticker LoadTimeCounter;
ubhat 0:42863a11464a 19
ubhat 0:42863a11464a 20 volatile uint32_t CurrentTime = 0;
ubhat 0:42863a11464a 21
ubhat 0:42863a11464a 22 void TimerResetTimeCounter( void )
ubhat 0:42863a11464a 23 {
ubhat 0:42863a11464a 24 CurrentTime = CurrentTime + TimeCounter.read_us( );
ubhat 0:42863a11464a 25 TimeCounter.reset( );
ubhat 0:42863a11464a 26 TimeCounter.start( );
ubhat 0:42863a11464a 27 }
ubhat 0:42863a11464a 28
ubhat 0:42863a11464a 29 void TimerTimeCounterInit( void )
ubhat 0:42863a11464a 30 {
ubhat 0:42863a11464a 31 TimeCounter.start( );
ubhat 0:42863a11464a 32 LoadTimeCounter.attach( &TimerResetTimeCounter, 10 );
ubhat 0:42863a11464a 33 }
ubhat 0:42863a11464a 34
ubhat 0:42863a11464a 35 TimerTime_t TimerGetCurrentTime( void )
ubhat 0:42863a11464a 36 {
ubhat 0:42863a11464a 37 CurrentTime += TimeCounter.read_us( );
ubhat 0:42863a11464a 38 TimeCounter.reset( );
ubhat 0:42863a11464a 39 TimeCounter.start( );
ubhat 0:42863a11464a 40 return ( ( TimerTime_t )CurrentTime );
ubhat 0:42863a11464a 41 }
ubhat 0:42863a11464a 42
ubhat 0:42863a11464a 43 TimerTime_t TimerGetElapsedTime( TimerTime_t savedTime )
ubhat 0:42863a11464a 44 {
ubhat 0:42863a11464a 45 CurrentTime += TimeCounter.read_us( );
ubhat 0:42863a11464a 46 TimeCounter.reset( );
ubhat 0:42863a11464a 47 TimeCounter.start( );
ubhat 0:42863a11464a 48 return ( TimerTime_t )( CurrentTime - savedTime );
ubhat 0:42863a11464a 49 }
ubhat 0:42863a11464a 50
ubhat 0:42863a11464a 51 TimerTime_t TimerGetFutureTime( TimerTime_t eventInFuture )
ubhat 0:42863a11464a 52 {
ubhat 0:42863a11464a 53 CurrentTime += TimeCounter.read_us( );
ubhat 0:42863a11464a 54 TimeCounter.reset( );
ubhat 0:42863a11464a 55 TimeCounter.start( );
ubhat 0:42863a11464a 56 return ( TimerTime_t )( CurrentTime + eventInFuture );
ubhat 0:42863a11464a 57 }
ubhat 0:42863a11464a 58
ubhat 0:42863a11464a 59 void TimerInit( TimerEvent_t *obj, void ( *callback )( void ) )
ubhat 0:42863a11464a 60 {
ubhat 0:42863a11464a 61 obj->value = 0;
ubhat 0:42863a11464a 62 obj->Callback = callback;
ubhat 0:42863a11464a 63 }
ubhat 0:42863a11464a 64
ubhat 0:42863a11464a 65 void TimerStart( TimerEvent_t *obj )
ubhat 0:42863a11464a 66 {
ubhat 0:42863a11464a 67 obj->Timer.attach_us( obj->Callback, obj->value );
ubhat 0:42863a11464a 68 }
ubhat 0:42863a11464a 69
ubhat 0:42863a11464a 70 void TimerStop( TimerEvent_t *obj )
ubhat 0:42863a11464a 71 {
ubhat 0:42863a11464a 72 obj->Timer.detach( );
ubhat 0:42863a11464a 73 }
ubhat 0:42863a11464a 74
ubhat 0:42863a11464a 75 void TimerSetValue( TimerEvent_t *obj, uint32_t value )
ubhat 0:42863a11464a 76 {
ubhat 0:42863a11464a 77 obj->value = value;
ubhat 0:42863a11464a 78 }