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Dragino mini JPでSleepさせながらの間欠動作

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Dragino mini JPでSleepさせながらの間欠動作

Dragino mini JPはCPUにATmega328Pを使っていてArduino UNOと互換性を持っています。

Dragino mini JPをLoRaWAN端末として使う場合 LMICライブラリを使いますが

Dragino mini JP と LMICライブラリの組み合わせで Sleepさせながらの間欠動作の実験を行いました。


先ずはこちらのページから

[https://github.com/rocketscream/Low-Power]

Lightweight low power library for Arduino

をダウンロードして Arduino IDE に追加してください。

元々次の送信時間を設定していた行、125行目をコメントアウトして

// os_setTimedCallback(&sendjob, os_getTime()+sec2osticks(TX_INTERVAL), do_send);

以下の3行を追加してください。

for (int i=0; i<SLEEP_MIN; i++) {

// Use library from https://github.com/rocketscream/Low-Power

LowPower.powerDown(SLEEP_8S, ADC_OFF, BOD_OFF);

}

なお [SLEEP_MIN]はスリープさせたい時間を LowPower.powerDown()関数の第一引数に与えた時間で割った値となります。

これはSleep時間に設定できるのが最大8秒なので、それ以上Sleepさせたいときはこのように何回もSleepを繰り返させます。

今回の例では SLEEP_MIN を 37 としていますので

スリープ時間は 8s × 37 = 296s(約5分) となります。


時間設定は

(a) SLEEP_15MS - 15 ms sleep

(b) SLEEP_30MS - 30 ms sleep

(c) SLEEP_60MS - 60 ms sleep

(d) SLEEP_120MS - 120 ms sleep

(e) SLEEP_250MS - 250 ms sleep

(f) SLEEP_500MS - 500 ms sleep

(g) SLEEP_1S - 1 s sleep

(h) SLEEP_2S - 2 s sleep

(i) SLEEP_4S - 4 s sleep

(j) SLEEP_8S - 8 s sleep

(k) SLEEP_FOREVER - WDT以外での起動

これらの値が選択できます。

これで LMICライブラリを使った Dragino mini JP の間欠動作を行うことが出来ます。

ただしArduinoをSleepさせているだけで LoRaチップを低消費電力化しているわけではありません。


dragino_lorawan_join_abp_sleep.ino

/*******************************************************************************

* 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.
*H
* This example sends a valid LoRaWAN packet with payload "Hello,
* world!", 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).
*
* Change DEVADDR to a unique address!
* See http://thethingsnetwork.org/wiki/AddressSpace
*
* Do not forget to define the radio type correctly in config.h.
*
*******************************************************************************/

#include <lmic.h>
#include <hal/hal.h>
#include <SPI.h>
#include <LowPower.h>

#define SLEEP_MIN 37

// LoRaWAN NwkSKey, network session key
// This is the default Semtech key, which is used by the prototype TTN
// network initially.
//ttn
static const PROGMEM u1_t NWKSKEY[16] = { 0xBE, 0xC4, 0x99, 0xC6, 0x9E, 0x9C, 0x93, 0x9E, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x03 };
// LoRaWAN AppSKey, application session key
// This is the default Semtech key, which is used by the prototype TTN
// network initially.
//ttn
static const u1_t PROGMEM APPSKEY[16] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
// LoRaWAN end-device address (DevAddr)
// See http://thethingsnetwork.org/wiki/AddressSpace
//ttn
static const u4_t DEVADDR = 0x76FFFF03;

// 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 uint8_t mydata[16] = " ";
static osjob_t initjob,sendjob,blinkjob;
static int send_counter = 0;

// Schedule TX every this many seconds (might become longer due to duty
// cycle limitations).
const unsigned TX_INTERVAL = 1*60; // 1分

// Pin mapping
const lmic_pinmap lmic_pins = {
.nss = 10,
.rxtx = LMIC_UNUSED_PIN,
.rst = 9,
.dio = {2, 6, 7},
};
void do_send(osjob_t* j){
// Check if there is not a current TX/RX job running
if (LMIC.opmode & OP_TXRXPEND) {
Serial.println("OP_TXRXPEND, not sending");
} else {
send_counter++;
sprintf(mydata,"%06d",send_counter);
// Prepare upstream data transmission at the next possible time.
LMIC_setTxData2(1, mydata, sizeof(mydata)-1, 0);
Serial.println("Packet queued");
Serial.println(LMIC.freq);
}
// Next TX is scheduled after TX_COMPLETE event.
}

void onEvent (ev_t ev) {
Serial.print(os_getTime());
Serial.print(": ");
Serial.println(ev);
switch(ev) {
case EV_SCAN_TIMEOUT:
Serial.println("EV_SCAN_TIMEOUT");
break;
case EV_BEACON_FOUND:
Serial.println("EV_BEACON_FOUND");
break;
case EV_BEACON_MISSED:
Serial.println("EV_BEACON_MISSED");
break;
case EV_BEACON_TRACKED:
Serial.println("EV_BEACON_TRACKED");
break;
case EV_JOINING:
Serial.println("EV_JOINING");
break;
case EV_JOINED:
Serial.println("EV_JOINED");
break;
case EV_RFU1:
Serial.println("EV_RFU1");
break;
case EV_JOIN_FAILED:
Serial.println("EV_JOIN_FAILED");
break;
case EV_REJOIN_FAILED:
Serial.println("EV_REJOIN_FAILED");
break;
case EV_TXCOMPLETE:
Serial.println("EV_TXCOMPLETE (includes waiting for RX windows)");
if(LMIC.dataLen) {
// data received in rx slot after tx
Serial.print("Data Received: ");
Serial.write(LMIC.frame+LMIC.dataBeg, LMIC.dataLen);
Serial.println();
}
// Schedule next transmission
// os_setTimedCallback(&sendjob, os_getTime()+sec2osticks(TX_INTERVAL), do_send);
for (int i=0; i<SLEEP_MIN; i++) {
// Use library from https://github.com/rocketscream/Low-Power
LowPower.powerDown(SLEEP_8S, ADC_OFF, BOD_OFF);
}
do_send(&sendjob);
break;
case EV_LOST_TSYNC:
Serial.println("EV_LOST_TSYNC");
break;
case EV_RESET:
Serial.println("EV_RESET");
break;
case EV_RXCOMPLETE:
// data received in ping slot
Serial.println("EV_RXCOMPLETE");
break;
case EV_LINK_DEAD:
Serial.println("EV_LINK_DEAD");
break;
case EV_LINK_ALIVE:
Serial.println("EV_LINK_ALIVE");
break;
default:
Serial.println("Unknown event");
break;
}
}

void setup() {
Serial.begin(9600);
while(!Serial);
Serial.println("Starting");
#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();
//LMIC_setClockError(MAX_CLOCK_ERROR * 1/100);
// 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

// Disable link check validation
LMIC_setLinkCheckMode(0);

// TTN uses SF9 for its RX2 window.
LMIC.dn2Dr = DR_SF9;

// 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);
}

void loop() {
os_runloop_once();
}