Initial import of support files for all Digistump boards - Digispark, Pro, DigiX - including libraries, examples, tools, and other support files for the Arduino IDE

hardware/digistump/avr/libraries/RF24/examples/GettingStarted/GettingStarted.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 for Getting Started with nRF24L01+ radios. 
+ *
+ * This is an example of how to use the RF24 class.  Write this sketch to two 
+ * different nodes.  Put one of the nodes into 'transmit' mode by connecting 
+ * with the serial monitor and sending a 'T'.  The ping node sends the current 
+ * time to the pong node, which responds by sending the value back.  The ping 
+ * node can then see how long the whole cycle took.
+ */
+
+#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(9,10);
+
+//
+// Topology
+//
+
+// Radio pipe addresses for the 2 nodes to communicate.
+const uint64_t pipes[2] = { 0xF0F0F0F0E1LL, 0xF0F0F0F0D2LL };
+
+//
+// Role management
+//
+// Set up role.  This sketch uses the same software for all the nodes
+// in this system.  Doing so greatly simplifies testing.  
+//
+
+// The various roles supported by this sketch
+typedef enum { role_ping_out = 1, role_pong_back } role_e;
+
+// The debug-friendly names of those roles
+const char* role_friendly_name[] = { "invalid", "Ping out", "Pong back"};
+
+// The role of the current running sketch
+role_e role = role_pong_back;
+
+void setup(void)
+{
+  //
+  // Print preamble
+  //
+
+  Serial.begin(57600);
+  printf_begin();
+  printf("\n\rRF24/examples/GettingStarted/\n\r");
+  printf("ROLE: %s\n\r",role_friendly_name[role]);
+  printf("*** PRESS 'T' to begin transmitting to the other node\n\r");
+
+  //
+  // Setup and configure rf radio
+  //
+
+  radio.begin();
+
+  // optionally, increase the delay between retries & # of retries
+  radio.setRetries(15,15);
+
+  // optionally, reduce the payload size.  seems to
+  // improve reliability
+  //radio.setPayloadSize(8);
+
+  //
+  // Open pipes to other nodes for communication
+  //
+
+  // This simple sketch opens two pipes for these two nodes to communicate
+  // back and forth.
+  // Open 'our' pipe for writing
+  // Open the 'other' pipe for reading, in position #1 (we can have up to 5 pipes open for reading)
+
+  //if ( role == role_ping_out )
+  {
+    //radio.openWritingPipe(pipes[0]);
+    radio.openReadingPipe(1,pipes[1]);
+  }
+  //else
+  {
+    //radio.openWritingPipe(pipes[1]);
+    //radio.openReadingPipe(1,pipes[0]);
+  }
+
+  //
+  // Start listening
+  //
+
+  radio.startListening();
+
+  //
+  // Dump the configuration of the rf unit for debugging
+  //
+
+  radio.printDetails();
+}
+
+void loop(void)
+{
+  //
+  // Ping out role.  Repeatedly send the current time
+  //
+
+  if (role == role_ping_out)
+  {
+    // First, stop listening so we can talk.
+    radio.stopListening();
+
+    // Take the time, and send it.  This will block until complete
+    unsigned long time = millis();
+    printf("Now sending %lu...",time);
+    bool ok = radio.write( &time, sizeof(unsigned long) );
+    
+    if (ok)
+      printf("ok...");
+    else
+      printf("failed.\n\r");
+
+    // Now, continue listening
+    radio.startListening();
+
+    // Wait here until we get a response, or timeout (250ms)
+    unsigned long started_waiting_at = millis();
+    bool timeout = false;
+    while ( ! radio.available() && ! timeout )
+      if (millis() - started_waiting_at > 200 )
+        timeout = true;
+
+    // Describe the results
+    if ( timeout )
+    {
+      printf("Failed, response timed out.\n\r");
+    }
+    else
+    {
+      // Grab the response, compare, and send to debugging spew
+      unsigned long got_time;
+      radio.read( &got_time, sizeof(unsigned long) );
+
+      // Spew it
+      printf("Got response %lu, round-trip delay: %lu\n\r",got_time,millis()-got_time);
+    }
+
+    // Try again 1s later
+    delay(1000);
+  }
+
+  //
+  // Pong back role.  Receive each packet, dump it out, and send it back
+  //
+
+  if ( role == role_pong_back )
+  {
+    // if there is data ready
+    if ( radio.available() )
+    {
+      // Dump the payloads until we've gotten everything
+      unsigned long got_time;
+      bool done = false;
+      while (!done)
+      {
+        // Fetch the payload, and see if this was the last one.
+        done = radio.read( &got_time, sizeof(unsigned long) );
+
+        // Spew it
+        printf("Got payload %lu...",got_time);
+
+	// Delay just a little bit to let the other unit
+	// make the transition to receiver
+	delay(20);
+      }
+
+      // First, stop listening so we can talk
+      radio.stopListening();
+
+      // Send the final one back.
+      radio.write( &got_time, sizeof(unsigned long) );
+      printf("Sent response.\n\r");
+
+      // Now, resume listening so we catch the next packets.
+      radio.startListening();
+    }
+  }
+
+  //
+  // Change roles
+  //
+
+  if ( Serial.available() )
+  {
+    char c = toupper(Serial.read());
+    if ( c == 'T' && role == role_pong_back )
+    {
+      printf("*** CHANGING TO TRANSMIT ROLE -- PRESS 'R' TO SWITCH BACK\n\r");
+
+      // Become the primary transmitter (ping out)
+      role = role_ping_out;
+      radio.openWritingPipe(pipes[0]);
+      radio.openReadingPipe(1,pipes[1]);
+    }
+    else if ( c == 'R' && role == role_ping_out )
+    {
+      printf("*** CHANGING TO RECEIVE ROLE -- PRESS 'T' TO SWITCH BACK\n\r");
+      
+      // Become the primary receiver (pong back)
+      role = role_pong_back;
+      radio.openWritingPipe(pipes[1]);
+      radio.openReadingPipe(1,pipes[0]);
+    }
+  }
+}
+// vim:cin:ai:sts=2 sw=2 ft=cpp