nordic_fob example fully working.
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maniacbug
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@ -1,5 +1,5 @@
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/*
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Copyright (C) 2011 J. Coliz <maniacbug@ymail.com>
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Copyright (C) 2012 J. Coliz <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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@ -7,17 +7,16 @@
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*/
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/**
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* Example RF Radio Ping Pair
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* Example Nordic FOB Receiver
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*
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* This is an example of how to use the RF24 class. 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 time to the pong node,
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* which responds by sending the value back. The ping node can then see how long the whole cycle
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* took.
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* This is an example of how to use the RF24 class to receive signals from the
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* Sparkfun Nordic FOB. See http://www.sparkfun.com/products/8602 .
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* Thanks to Kirk Mower for providing test hardware.
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*/
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#include <SPI.h>
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#include <RF24.h>
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#include "nRF24L01.h"
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#include "RF24.h"
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#include "printf.h"
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//
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@ -26,96 +25,53 @@
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// Set up nRF24L01 radio on SPI bus plus pins 9 & 10
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RF24 radio(9,10);
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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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RF24 radio(8,9);
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//
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// Topology
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// Payload
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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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struct payload_t
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{
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uint8_t buttons;
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uint16_t id;
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uint8_t empty;
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};
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const char* button_names[] = { "Up", "Down", "Left", "Right", "Center" };
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const int num_buttons = 5;
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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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// Forward declarations
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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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uint16_t flip_endian(uint16_t in);
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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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// Setup
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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/\n\r");
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printf("ROLE: %s\n\r",role_friendly_name[role]);
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printf("\r\nRF24/examples/nordic_fob/\r\n");
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//
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// Setup and configure rf radio
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// Setup and configure rf radio according to the built-in parameters
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// of the FOB.
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//
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radio.begin();
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// optionally, increase the delay between retries & # of retries
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radio.setRetries(15,15);
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// optionally, reduce the payload size. seems to
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// improve reliability
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radio.setPayloadSize(8);
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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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radio.setChannel(2);
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radio.setPayloadSize(4);
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radio.setAutoAck(false);
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radio.setCRCLength(RF24_CRC_8);
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radio.openReadingPipe(1,0xE7E7E7E7E7LL);
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//
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// Start listening
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@ -130,91 +86,56 @@ void setup(void)
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radio.printDetails();
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}
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//
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// Loop
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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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// Receive each packet, dump it out
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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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bool ok = radio.write( &time, sizeof(unsigned long) );
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if (ok)
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printf("ok...");
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else
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printf("failed.\n\r");
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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 > 200 )
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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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// Try again 1s later
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delay(1000);
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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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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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// Get the packet from the radio
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payload_t payload;
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radio.read( &payload, sizeof(payload) );
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// Print the ID of this message. Note that the message
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// is sent 'big-endian', so we have to flip it.
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printf("#%05u Buttons ",flip_endian(payload.id));
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// Print the name of each button
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int i = num_buttons;
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while (i--)
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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
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printf("Got payload %lu...",got_time);
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// Delay just a little bit to let the other unit
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// make the transition to receiver
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delay(20);
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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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if ( ! ( payload.buttons & _BV(i) ) )
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{
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printf("%s ",button_names[i]);
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}
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}
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// If no buttons, print None
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if ( payload.buttons == _BV(num_buttons) - 1 )
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printf("None");
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printf("\r\n");
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}
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}
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//
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// Helper functions
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//
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// Change a big-endian word into a little-endian
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uint16_t flip_endian(uint16_t in)
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{
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uint16_t low = in >> 8;
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uint16_t high = in << 8;
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return high | low;
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}
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// vim:cin:ai:sts=2 sw=2 ft=cpp
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