/*
 Copyright (C) 2011 James Coliz, Jr. <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.
 */

/**
 * Interrupt-driven test for native target
 *
 * This example is the friendliest for the native target because it doesn't do
 * any polling.  Made a slight change to call done() at the end of setup.
 */

#include <SPI.h>
#include "nRF24L01.h"
#include "RF24.h"
#include "printf.h"

//
// Hardware configuration
//

// Set up nRF24L01 radio on SPI bus plus pins 8 & 9

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(115200);
    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();
    radio.enableDynamicPayloads();  // needed for using ACK payloads

    //
    // 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);

    //
    // On the native target, this is as far as we get
    //
    #if NATIVE
    done();
    #endif
}

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", (unsigned long) 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