Raspberry Pi support

Added support for hardware SPI on RPI per jscrane fork: - Fixed a few bugs with single SPI transfers - Aligned with optimized RF24 library fork - Updated bmc2835 files per http://www.airspayce.com/mikem/bcm2835/index.html - Merged bcm files with changes from https://github.com/farconada/RF24Network - Added example files - Added setup info to readme
2014-04-24 14:47:39 -06:00
parent 8ff9fb6f15
commit 2406e06a77
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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.
+
+ 03/17/2013 : Charles-Henri Hallard (http://hallard.me)
+              Modified to use with Arduipi board http://hallard.me/arduipi
+						  Changed to use modified bcm2835 and RF24 library
+TMRh20 2014 - Updated to work with optimized RF24 Arduino library
+
+ */
+
+/**
+ * Example RF Radio Ping Pair
+ *
+ * This is an example of how to use the RF24 class on RPi, communicating to an Arduino running
+ * the GettingStarted sketch.
+ */
+
+#include <cstdlib>
+#include <iostream>
+#include <sstream>
+#include <string>
+#include "./RF24.h"
+
+using namespace std;
+//
+// Hardware configuration
+//
+
+// CE Pin, CSN Pin, SPI Speed
+
+// Setup for GPIO 22 CE and GPIO 25 CSN with SPI Speed @ 1Mhz
+//RF24 radio(RPI_V2_GPIO_P1_22, RPI_V2_GPIO_P1_18, BCM2835_SPI_SPEED_1MHZ);
+
+// Setup for GPIO 22 CE and CE0 CSN with SPI Speed @ 4Mhz
+//RF24 radio(RPI_V2_GPIO_P1_15, BCM2835_SPI_CS0, BCM2835_SPI_SPEED_4MHZ);
+
+// Setup for GPIO 22 CE and CE1 CSN with SPI Speed @ 8Mhz
+//RF24 radio(RPI_V2_GPIO_P1_15, RPI_V2_GPIO_P1_26, BCM2835_SPI_SPEED_8MHZ);
+RF24 radio(RPI_V2_GPIO_P1_15,BCM2835_SPI_CS0, BCM2835_SPI_SPEED_8MHZ);
+
+
+
+// Radio pipe addresses for the 2 nodes to communicate.
+const uint64_t pipes[2] = { 0xABCDABCD71LL, 0x544d52687CLL };
+
+bool role_ping_out = 1, role_pong_back = 0;
+bool role = 0;
+
+int main(int argc, char** argv){
+
+
+  // Print preamble:
+  printf("RF24/examples/pingtest/\n");
+
+  // Setup and configure rf radio
+  radio.begin();
+
+  // optionally, increase the delay between retries & # of retries
+  radio.setRetries(15,15);
+
+  // Dump the configuration of the rf unit for debugging
+  radio.printDetails();
+
+
+/********* Role chooser ***********/
+
+  printf("\n ************ Role Setup ***********\n");
+  string input = "";
+  char myChar = {0};
+  cout << "Choose a role: Enter 0 for pong_back, 1 for ping_out (CTRL+C to exit) \n>";
+  getline(cin,input);
+
+  if(input.length() == 1) {
+	myChar = input[0];
+	if(myChar == '0'){
+		cout << "Role: Pong Back, awaiting transmission " << endl << endl;
+	}else{  cout << "Role: Ping Out, starting transmission " << endl << endl;
+		role = role_ping_out;
+	}
+  }
+/***********************************/
+  // This simple sketch opens two pipes for these two nodes to communicate
+  // back and forth.
+
+    if ( role == role_ping_out )    {
+      radio.openWritingPipe(pipes[0]);
+      radio.openReadingPipe(1,pipes[1]);
+    } else {
+      radio.openWritingPipe(pipes[1]);
+      radio.openReadingPipe(1,pipes[0]);
+      radio.startListening();
+
+    }
+
+	// forever loop
+	while (1)
+	{
+		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
+
+			printf("Now sending...\n");
+			unsigned long time = millis();
+
+			bool ok = radio.write( &time, sizeof(unsigned long) );
+
+			if (!ok){
+				printf("failed.\n");
+			}
+			// 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 ) {
+					// by bcatalin » Thu Feb 14, 2013 11:26 am
+					//delay(5); //add a small delay to let radio.available to check payload
+				if (millis() - started_waiting_at > 200 )
+					timeout = true;
+			}
+
+
+			// Describe the results
+			if ( timeout )
+			{
+				printf("Failed, response timed out.\n");
+			}
+			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",got_time,millis()-got_time);
+			}
+
+			// Try again 1s later
+			//    delay(1000);
+			sleep(1);
+
+		}
+
+		//
+		// Pong back role.  Receive each packet, dump it out, and send it back
+		//
+
+		if ( role == role_pong_back )
+		{
+			// if there is data ready
+			//printf("Check available...\n");
+			//delay(3);
+			if ( radio.available() )
+			{
+				// Dump the payloads until we've gotten everything
+				unsigned long got_time;
+
+
+				// Fetch the payload, and see if this was the last one.
+				radio.read( &got_time, sizeof(unsigned long) );
+
+				radio.stopListening();
+				//delay(1);
+				// Seem to need a  delay, or the RPi is too quick
+				radio.write( &got_time, sizeof(unsigned long) );
+
+				//delay(1);
+				// Now, resume listening so we catch the next packets.
+				radio.startListening();
+				 //delay(1);
+				// Spew it
+				printf("Got payload(%d) %lu...\n",sizeof(unsigned long), got_time);
+			}
+		//delay(5);
+		}
+	} // forever loop
+
+  return 0;
+}
+