rf24-pio/examples/pingpair_irq/pingpair_irq.pde

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/*
Copyright (C) 2011 J. Coliz <maniacbug@ymail.com>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
version 2 as published by the Free Software Foundation.
*/
/**
* Example of using interrupts
*
* This is an example of how to user interrupts to interact with the radio.
* It builds on the pingpair_pl example, and uses ack payloads.
*/
#include <SPI.h>
#include "nRF24L01.h"
#include "RF24.h"
#include "printf.h"
//
// Hardware configuration
//
// Set up nRF24L01 radio on SPI bus plus pins 9 & 10
RF24 radio(8,9);
// sets the role of this unit in hardware. Connect to GND to be the 'pong' receiver
// Leave open to be the 'ping' transmitter
const short role_pin = 7;
//
// Topology
//
// Single radio pipe address for the 2 nodes to communicate.
const uint64_t pipe = 0xE8E8F0F0E1LL;
//
// Role management
//
// Set up role. This sketch uses the same software for all the nodes in this
// system. Doing so greatly simplifies testing. The hardware itself specifies
// which node it is.
//
// This is done through the role_pin
//
// The various roles supported by this sketch
typedef enum { role_sender = 1, role_receiver } role_e;
// The debug-friendly names of those roles
const char* role_friendly_name[] = { "invalid", "Sender", "Receiver"};
// The role of the current running sketch
role_e role;
// Interrupt handler, check the radio because we got an IRQ
void check_radio(void);
void setup(void)
{
//
// Role
//
// set up the role pin
pinMode(role_pin, INPUT);
digitalWrite(role_pin,HIGH);
delay(20); // Just to get a solid reading on the role pin
// read the address pin, establish our role
if ( digitalRead(role_pin) )
role = role_sender;
else
role = role_receiver;
//
// Print preamble
//
Serial.begin(57600);
printf_begin();
printf("\n\rRF24/examples/pingpair_irq/\n\r");
printf("ROLE: %s\n\r",role_friendly_name[role]);
//
// Setup and configure rf radio
//
radio.begin();
// We will be using the Ack Payload feature, so please enable it
radio.enableAckPayload();
//
// Open pipes to other nodes for communication
//
// This simple sketch opens a single pipe for these two nodes to communicate
// back and forth. One listens on it, the other talks to it.
if ( role == role_sender )
{
radio.openWritingPipe(pipe);
}
else
{
radio.openReadingPipe(1,pipe);
}
//
// Start listening
//
if ( role == role_receiver )
radio.startListening();
//
// Dump the configuration of the rf unit for debugging
//
radio.printDetails();
//
// Attach interrupt handler to interrupt #0 (using pin 2)
// on BOTH the sender and receiver
//
attachInterrupt(0, check_radio, FALLING);
}
static uint32_t message_count = 0;
void loop(void)
{
//
// Sender role. Repeatedly send the current time
//
if (role == role_sender)
{
// Take the time, and send it.
unsigned long time = millis();
printf("Now sending %lu\n\r",time);
radio.startWrite( &time, sizeof(unsigned long) );
// Try again soon
delay(2000);
}
//
// Receiver role: Does nothing! All the work is in IRQ
//
}
void check_radio(void)
{
// What happened?
bool tx,fail,rx;
radio.whatHappened(tx,fail,rx);
// Have we successfully transmitted?
if ( tx )
{
if ( role == role_sender )
printf("Send:OK\n\r");
if ( role == role_receiver )
printf("Ack Payload:Sent\n\r");
}
// Have we failed to transmit?
if ( fail )
{
if ( role == role_sender )
printf("Send:Failed\n\r");
if ( role == role_receiver )
printf("Ack Payload:Failed\n\r");
}
// Transmitter can power down for now, because
// the transmission is done.
if ( ( tx || fail ) && ( role == role_sender ) )
radio.powerDown();
// Did we receive a message?
if ( rx )
{
// If we're the sender, we've received an ack payload
if ( role == role_sender )
{
radio.read(&message_count,sizeof(message_count));
printf("Ack:%lu\n\r",message_count);
}
// If we're the receiver, we've received a time message
if ( role == role_receiver )
{
// Get this payload and dump it
static unsigned long got_time;
radio.read( &got_time, sizeof(got_time) );
printf("Got payload %lu\n\r",got_time);
// Add an ack packet for the next time around. This is a simple
// packet counter
radio.writeAckPayload( 1, &message_count, sizeof(message_count) );
++message_count;
}
}
}
// vim:ai:cin:sts=2 sw=2 ft=cpp