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/*
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Copyright (C) 2011 James Coliz, Jr. <maniacbug@ymail.com>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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version 2 as published by the Free Software Foundation.
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*/
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/**
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* Example RF Radio Ping Pair which Sleeps between Sends
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*
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* This is an example of how to use the RF24 class to create a battery-
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* efficient system. It is just like the pingpair.pde example, but the
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* ping node powers down the radio and sleeps the MCU after every
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* ping/pong cycle.
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*
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* As with the pingpair.pde example, write this sketch to two different nodes,
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* connect the role_pin to ground on one. The ping node sends the current
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* time to the pong node, which responds by sending the value back. The ping
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* node can then see how long the whole cycle took.
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*/
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#include <SPI.h>
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#include <avr/sleep.h>
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#include <avr/power.h>
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#include "RF24.h"
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#include "printf.h"
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//
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// Hardware configuration
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//
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// Set up nRF24L01 radio on SPI bus plus pins 8 & 9
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RF24 radio(8,9);
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// sets the role of this unit in hardware. Connect to GND to be the 'pong' receiver
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// Leave open to be the 'ping' transmitter
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const int role_pin = 7;
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//
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// Topology
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//
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// Radio pipe addresses for the 2 nodes to communicate.
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const uint64_t pipes[2] = { 0xF0F0F0F0E1LL, 0xF0F0F0F0D2LL };
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//
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// Role management
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//
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// Set up role. This sketch uses the same software for all the nodes
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// in this system. Doing so greatly simplifies testing. The hardware itself specifies
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// which node it is.
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//
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// This is done through the role_pin
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//
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// The various roles supported by this sketch
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typedef enum { role_ping_out = 1, role_pong_back } role_e;
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// The debug-friendly names of those roles
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const char* role_friendly_name[] = { "invalid", "Ping out", "Pong back"};
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// The role of the current running sketch
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role_e role;
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//
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// Sleep declarations
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//
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typedef enum { wdt_16ms = 0, wdt_32ms, wdt_64ms, wdt_128ms, wdt_250ms, wdt_500ms, wdt_1s, wdt_2s, wdt_4s, wdt_8s } wdt_prescalar_e;
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void setup_watchdog(uint8_t prescalar);
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void do_sleep(void);
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const short sleep_cycles_per_transmission = 4;
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volatile short sleep_cycles_remaining = sleep_cycles_per_transmission;
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//
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// Normal operation
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//
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void setup(void)
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{
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//
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// Role
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//
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// set up the role pin
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pinMode(role_pin, INPUT);
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digitalWrite(role_pin,HIGH);
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delay(20); // Just to get a solid reading on the role pin
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// read the address pin, establish our role
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if ( digitalRead(role_pin) )
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role = role_ping_out;
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else
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role = role_pong_back;
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//
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// Print preamble
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//
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Serial.begin(57600);
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printf_begin();
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printf("\n\rRF24/examples/pingpair_sleepy/\n\r");
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printf("ROLE: %s\n\r",role_friendly_name[role]);
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//
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// Prepare sleep parameters
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//
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// Only the ping out role sleeps. Wake up every 4s to send a ping
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if ( role == role_ping_out )
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setup_watchdog(wdt_1s);
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//
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// Setup and configure rf radio
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//
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radio.begin();
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//
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// Open pipes to other nodes for communication
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//
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// This simple sketch opens two pipes for these two nodes to communicate
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// back and forth.
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// Open 'our' pipe for writing
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// Open the 'other' pipe for reading, in position #1 (we can have up to 5 pipes open for reading)
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if ( role == role_ping_out )
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{
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radio.openWritingPipe(pipes[0]);
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radio.openReadingPipe(1,pipes[1]);
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}
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else
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{
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radio.openWritingPipe(pipes[1]);
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radio.openReadingPipe(1,pipes[0]);
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}
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//
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// Start listening
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//
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radio.startListening();
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//
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// Dump the configuration of the rf unit for debugging
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//
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radio.printDetails();
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}
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void loop(void)
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{
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//
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// Ping out role. Repeatedly send the current time
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//
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if (role == role_ping_out)
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{
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// First, stop listening so we can talk.
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radio.stopListening();
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// Take the time, and send it. This will block until complete
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unsigned long time = millis();
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printf("Now sending %lu...",time);
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radio.write( &time, sizeof(unsigned long) );
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// Now, continue listening
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radio.startListening();
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// Wait here until we get a response, or timeout (250ms)
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unsigned long started_waiting_at = millis();
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bool timeout = false;
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while ( ! radio.available() && ! timeout )
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if (millis() - started_waiting_at > 250 )
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timeout = true;
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// Describe the results
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if ( timeout )
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{
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printf("Failed, response timed out.\n\r");
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}
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else
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{
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// Grab the response, compare, and send to debugging spew
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unsigned long got_time;
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radio.read( &got_time, sizeof(unsigned long) );
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// Spew it
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printf("Got response %lu, round-trip delay: %lu\n\r",got_time,millis()-got_time);
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}
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//
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// Shut down the system
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//
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// Experiment with some delay here to see if it has an effect
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delay(500);
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// Power down the radio. Note that the radio will get powered back up
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// on the next write() call.
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radio.powerDown();
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// Sleep the MCU. The watchdog timer will awaken in a short while, and
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// continue execution here.
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while( sleep_cycles_remaining )
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do_sleep();
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sleep_cycles_remaining = sleep_cycles_per_transmission;
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}
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//
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// Pong back role. Receive each packet, dump it out, and send it back
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//
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// This is untouched from the pingpair example.
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//
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if ( role == role_pong_back )
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{
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// if there is data ready
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if ( radio.available() )
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{
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// Dump the payloads until we've gotten everything
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unsigned long got_time;
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bool done = false;
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while (!done)
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{
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// Fetch the payload, and see if this was the last one.
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done = radio.read( &got_time, sizeof(unsigned long) );
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// Spew it. Include our time, because the ping_out millis counter is unreliable
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// due to it sleeping
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printf("Got payload %lu @ %lu...",got_time,millis());
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}
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// First, stop listening so we can talk
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radio.stopListening();
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// Send the final one back.
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radio.write( &got_time, sizeof(unsigned long) );
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printf("Sent response.\n\r");
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// Now, resume listening so we catch the next packets.
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radio.startListening();
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}
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}
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}
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//
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// Sleep helpers
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//
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// 0=16ms, 1=32ms,2=64ms,3=125ms,4=250ms,5=500ms
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// 6=1 sec,7=2 sec, 8=4 sec, 9= 8sec
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void setup_watchdog(uint8_t prescalar)
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{
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prescalar = min(9,prescalar);
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uint8_t wdtcsr = prescalar & 7;
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if ( prescalar & 8 )
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wdtcsr |= _BV(WDP3);
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MCUSR &= ~_BV(WDRF);
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WDTCSR = _BV(WDCE) | _BV(WDE);
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WDTCSR = _BV(WDCE) | wdtcsr | _BV(WDIE);
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}
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ISR(WDT_vect)
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{
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--sleep_cycles_remaining;
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}
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void do_sleep(void)
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{
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set_sleep_mode(SLEEP_MODE_PWR_DOWN); // sleep mode is set here
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sleep_enable();
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sleep_mode(); // System sleeps here
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sleep_disable(); // System continues execution here when watchdog timed out
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radio.powerUp() ;
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}
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// vim:ai:cin:sts=2 sw=2 ft=cpp
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