sure, here the sketch. It's more or less based on this:
It does not much more than some debug blinking and transmit a constant value every 60 seconds.
I think, a simple blink (without using LMIC) in lowpower works, but I have to verify this again. Lowpower+LMIC works too if powered from USB, however I have not measured if the device really goes into low power mode.
Code: Select all
/*******************************************************************************
* Copyright (c) 2015 Thomas Telkamp and Matthijs Kooijman
*
* Permission is hereby granted, free of charge, to anyone
* obtaining a copy of this document and accompanying files,
* to do whatever they want with them without any restriction,
* including, but not limited to, copying, modification and redistribution.
* NO WARRANTY OF ANY KIND IS PROVIDED.
*
* This example sends a valid LoRaWAN packet with static payload,
* using frequency and encryption settings matching those of
* the (early prototype version of) The Things Network.
*
* Note: LoRaWAN per sub-band duty-cycle limitation is enforced (1% in g1,
* 0.1% in g2).
*
* ToDo:
* - set NWKSKEY (value from staging.thethingsnetwork.com)
* - set APPKSKEY (value from staging.thethingsnetwork.com)
* - set DEVADDR (value from staging.thethingsnetwork.com)
* - optionally comment #define DEBUG
* - optionally comment #define SLEEP
* - set TX_INTERVAL in seconds
* - change mydata to another (small) static text
*
*******************************************************************************/
#define BLINK
// use low power sleep; comment next line to not use low power sleep
#define SLEEP
#ifdef SLEEP
#include "LowPower.h"
bool next = false;
#endif
#ifdef BLINK
#include <T2WhisperNode.h>
#endif
#include <lmic.h>
#include <hal/hal.h>
//#include <SPI.h>
// LoRaWAN NwkSKey, network session key
// This is the default Semtech key, which is used by the early prototype TTN
// network.
static const PROGMEM u1_t NWKSKEY[16] = { 0xXX, 0xXX, 0xXX, 0xXX, 0xXX, 0xXX, 0xXX, 0xXX, 0xXX, 0xXX, 0xXX, 0xXX, 0xXX, 0xXX, 0xXX, 0xX };
// LoRaWAN AppSKey, application session key
// This is the default Semtech key, which is used by the early prototype TTN
// network.
static const u1_t PROGMEM APPSKEY[16] = { 0xXX, 0xXX, 0xXX, 0xXX, 0xXX, 0xXX, 0xXX, 0xXX, 0xXX, 0xXX, 0xXX, 0xXX, 0xXX, 0xXX, 0xXX, 0xXX };
// LoRaWAN end-device address (DevAddr)
static const u4_t DEVADDR = 0xXXXXXXXX ; // <-- Change this address for every node!
// show debug statements; comment next line to disable debug statements
#define DEBUG
//#undef DEBUG
// Schedule TX every this many seconds (might become longer due to duty
// cycle limitations).
const unsigned TX_INTERVAL = 60;
// static text, you can replace T
static uint8_t mydata[] = "DuAAFAXv";
// These callbacks are only used in over-the-air activation, so they are
// left empty here (we cannot leave them out completely unless
// DISABLE_JOIN is set in config.h, otherwise the linker will complain).
void os_getArtEui (u1_t* buf) { }
void os_getDevEui (u1_t* buf) { }
void os_getDevKey (u1_t* buf) { }
static osjob_t sendjob;
// Pin mapping
const lmic_pinmap lmic_pins = {
.nss = 10,
.rxtx = LMIC_UNUSED_PIN,
.rst = 7,
.dio = {2, A2, LMIC_UNUSED_PIN},
};
#ifdef SLEEP
void do_sleep() {
int var = 0;
int NumberOf8Sec = 37;
while(var < NumberOf8Sec){ // here 37 x 8 seconds = about 5 minutes
// do something n times
delay(50); // had problems without. no idea why
var++;
// put the processor to sleep for 8 seconds
LowPower.powerDown(SLEEP_8S, ADC_OFF, BOD_OFF);
}
}
#endif
void onEvent (ev_t ev) {
#ifdef DEBUG
Serial.println(F("Enter onEvent"));
#endif
switch(ev) {
case EV_SCAN_TIMEOUT:
Serial.println(F("EV_SCAN_TIMEOUT"));
break;
case EV_BEACON_FOUND:
Serial.println(F("EV_BEACON_FOUND"));
break;
case EV_BEACON_MISSED:
Serial.println(F("EV_BEACON_MISSED"));
break;
case EV_BEACON_TRACKED:
Serial.println(F("EV_BEACON_TRACKED"));
break;
case EV_JOINING:
Serial.println(F("EV_JOINING"));
break;
case EV_JOINED:
Serial.println(F("EV_JOINED"));
break;
case EV_RFU1:
Serial.println(F("EV_RFU1"));
break;
case EV_JOIN_FAILED:
Serial.println(F("EV_JOIN_FAILED"));
break;
case EV_REJOIN_FAILED:
Serial.println(F("EV_REJOIN_FAILED"));
break;
case EV_TXCOMPLETE:
#ifdef DEBUG
Serial.println(F("EV_TXCOMPLETE (includes waiting for RX windows)"));
#endif
if(LMIC.dataLen) {
// data received in rx slot after tx
Serial.print(F("Data Received: "));
Serial.write(LMIC.frame+LMIC.dataBeg, LMIC.dataLen);
Serial.println();
}
// Schedule next transmission
#ifndef SLEEP
os_setTimedCallback(&sendjob, os_getTime()+sec2osticks(TX_INTERVAL), do_send);
#else
next = true;
#endif
break;
case EV_LOST_TSYNC:
Serial.println(F("EV_LOST_TSYNC"));
break;
case EV_RESET:
Serial.println(F("EV_RESET"));
break;
case EV_RXCOMPLETE:
// data received in ping slot
Serial.println(F("EV_RXCOMPLETE"));
break;
case EV_LINK_DEAD:
Serial.println(F("EV_LINK_DEAD"));
break;
case EV_LINK_ALIVE:
Serial.println(F("EV_LINK_ALIVE"));
break;
default:
Serial.println(F("Unknown event"));
break;
}
#ifdef DEBUG
Serial.println(F("Leave onEvent"));
#endif
};
void blinkYellow(int d)
{
digitalWrite(T2_WPN_LED_2, HIGH);
delay(d);
digitalWrite(T2_WPN_LED_2, LOW);
delay(d);
};
void blinkBlue(int d)
{
digitalWrite(T2_WPN_LED_1, HIGH);
delay(d);
digitalWrite(T2_WPN_LED_1, LOW);
delay(d);
};
void do_send(osjob_t* j){
#ifdef DEBUG
Serial.println(F("Enter do_send"));
#endif
#ifdef BLINK
blinkYellow(200);
#endif
// Check if there is not a current TX/RX job running
if (LMIC.opmode & OP_TXRXPEND) {
Serial.println(F("OP_TXRXPEND, not sending"));
} else {
// Prepare upstream data transmission at the next possible time.
LMIC_setTxData2(1, mydata, sizeof(mydata)-1, 0);
Serial.println(F("Packet queued"));
}
// Next TX is scheduled after TX_COMPLETE event.
#ifdef DEBUG
Serial.println(F("Leave do_send"));
#endif
};
void setup() {
#ifdef BLINK
blinkBlue(100);
#endif
#ifdef VCC_ENABLE
// For Pinoccio Scout boards
pinMode(VCC_ENABLE, OUTPUT);
digitalWrite(VCC_ENABLE, HIGH);
delay(1000);
#endif
// LMIC init
os_init();
// Reset the MAC state. Session and pending data transfers will be discarded.
LMIC_reset();
// Set static session parameters. Instead of dynamically establishing a session
// by joining the network, precomputed session parameters are be provided.
#ifdef PROGMEM
// On AVR, these values are stored in flash and only copied to RAM
// once. Copy them to a temporary buffer here, LMIC_setSession will
// copy them into a buffer of its own again.
uint8_t appskey[sizeof(APPSKEY)];
uint8_t nwkskey[sizeof(NWKSKEY)];
memcpy_P(appskey, APPSKEY, sizeof(APPSKEY));
memcpy_P(nwkskey, NWKSKEY, sizeof(NWKSKEY));
LMIC_setSession (0x1, DEVADDR, nwkskey, appskey);
#else
// If not running an AVR with PROGMEM, just use the arrays directly
LMIC_setSession (0x1, DEVADDR, NWKSKEY, APPSKEY);
#endif
// Set up the channels used by the Things Network, which corresponds
// to the defaults of most gateways. Without this, only three base
// channels from the LoRaWAN specification are used, which certainly
// works, so it is good for debugging, but can overload those
// frequencies, so be sure to configure the full frequency range of
// your network here (unless your network autoconfigures them).
// Setting up channels should happen after LMIC_setSession, as that
// configures the minimal channel set.
LMIC_setupChannel(0, 868100000, DR_RANGE_MAP(DR_SF12, DR_SF7), BAND_CENTI); // g-band
LMIC_setupChannel(1, 868300000, DR_RANGE_MAP(DR_SF12, DR_SF7B), BAND_CENTI); // g-band
LMIC_setupChannel(2, 868500000, DR_RANGE_MAP(DR_SF12, DR_SF7), BAND_CENTI); // g-band
LMIC_setupChannel(3, 867100000, DR_RANGE_MAP(DR_SF12, DR_SF7), BAND_CENTI); // g-band
LMIC_setupChannel(4, 867300000, DR_RANGE_MAP(DR_SF12, DR_SF7), BAND_CENTI); // g-band
LMIC_setupChannel(5, 867500000, DR_RANGE_MAP(DR_SF12, DR_SF7), BAND_CENTI); // g-band
LMIC_setupChannel(6, 867700000, DR_RANGE_MAP(DR_SF12, DR_SF7), BAND_CENTI); // g-band
LMIC_setupChannel(7, 867900000, DR_RANGE_MAP(DR_SF12, DR_SF7), BAND_CENTI); // g-band
LMIC_setupChannel(8, 868800000, DR_RANGE_MAP(DR_FSK, DR_FSK), BAND_MILLI); // g2-band
// TTN defines an additional channel at 869.525Mhz using SF9 for class B
// devices' ping slots. LMIC does not have an easy way to define set this
// frequency and support for class B is spotty and untested, so this
// frequency is not configured here.
// Disable link check validation
LMIC_setLinkCheckMode(0);
// Set data rate and transmit power (note: txpow seems to be ignored by the library)
LMIC_setDrTxpow(DR_SF7,14);
// Start job
do_send(&sendjob);
#ifdef DEBUG
Serial.println(F("Leave setup"));
#endif
}
void loop() {
#ifndef SLEEP
os_runloop_once();
#else
extern volatile unsigned long timer0_overflow_count;
if (next == false) {
os_runloop_once();
} else {
int sleepcycles = TX_INTERVAL / 8; // calculate the number of sleepcycles (8s) given the TX_INTERVAL
#ifdef DEBUG
Serial.print(F("Enter sleeping for "));
Serial.print(sleepcycles);
Serial.println(F(" cycles of 8 seconds"));
Serial.flush(); // give the serial print chance to complete
#endif
delay(200);
for (int i=0; i<sleepcycles; i++) {
// Enter power down state for 8 s with ADC and BOD module disabled
delay(50);
LowPower.powerDown(SLEEP_8S, ADC_OFF, BOD_OFF);
//LowPower.idle(SLEEP_8S, ADC_OFF, TIMER2_OFF, TIMER1_OFF, TIMER0_OFF, SPI_OFF, USART0_OFF, TWI_OFF);
// LMIC uses micros() to keep track of the duty cycle, so
// hack timer0_overflow for a rude adjustment:
cli();
timer0_overflow_count+= 8 * 64 * clockCyclesPerMicrosecond();
sei();
}
#ifdef DEBUG
Serial.println(F("Sleep complete"));
#endif
next = false;
// Start job
#ifdef BLINK
blinkYellow(100);
blinkYellow(100);
#endif
do_send(&sendjob);
}
#endif
}
