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digistump-sam/libraries/RF24/librf24-rpi/librf24/examples/rpi-hub.cpp

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+/* 
+ *
+ *  Filename : rpi-hub.cpp
+ *
+ *  This program makes the RPi as a hub listening to all six pipes from the remote sensor nodes ( usually Arduino )
+ *  and will return the packet back to the sensor on pipe0 so that the sender can calculate the round trip delays
+ *  when the payload matches.
+ *  
+ *  I encounter that at times, it also receive from pipe7 ( or pipe0 ) with content of FFFFFFFFF that I will not sent
+ *  back to the sender
+ *
+ *  Refer to RF24/examples/rpi_hub_arduino/ for the corresponding Arduino sketches to work with this code.
+ * 
+ *  
+ *  CE is not used and CSN is GPIO25 (not pinout)
+ *
+ *  Refer to RPi docs for GPIO numbers
+ *
+ *  Author : Stanley Seow
+ *  e-mail : stanleyseow@gmail.com
+ *  date   : 6th Mar 2013
+ *
+ */
+
+#include <cstdlib>
+#include <iostream>
+#include "../RF24.h"
+
+using namespace std;
+
+// Radio pipe addresses for the 2 nodes to communicate.
+// First pipe is for writing, 2nd, 3rd, 4th, 5th & 6th is for reading...
+const uint64_t pipes[6] = { 0xF0F0F0F0D2LL, 0xF0F0F0F0E1LL, 0xF0F0F0F0E2LL, 0xF0F0F0F0E3LL, 0xF0F0F0F0F1, 0xF0F0F0F0F2 };
+
+// CE and CSN pins On header using GPIO numbering (not pin numbers)
+RF24 radio("/dev/spidev0.0",8000000,25);  // Setup for GPIO 25 CSN
+
+
+void setup(void)
+{
+	//
+	// Refer to RF24.h or nRF24L01 DS for settings
+	radio.begin();
+	radio.enableDynamicPayloads();
+	radio.setAutoAck(1);
+	radio.setRetries(15,15);
+	radio.setDataRate(RF24_1MBPS);
+	radio.setPALevel(RF24_PA_MAX);
+	radio.setChannel(76);
+	radio.setCRCLength(RF24_CRC_16);
+
+	// Open 6 pipes for readings ( 5 plus pipe0, also can be used for reading )
+	radio.openWritingPipe(pipes[0]);
+	radio.openReadingPipe(1,pipes[1]);
+	radio.openReadingPipe(2,pipes[2]);
+	radio.openReadingPipe(3,pipes[3]);
+	radio.openReadingPipe(4,pipes[4]);
+	radio.openReadingPipe(5,pipes[5]);
+
+	//
+	// Start listening
+	//
+
+	radio.startListening();
+
+	//
+	// Dump the configuration of the rf unit for debugging
+	//
+
+	radio.printDetails();
+	printf("\n\rOutput below : \n\r");
+	usleep(1000);
+}
+
+void loop(void)
+{
+	char receivePayload[32];
+	uint8_t pipe = 1;
+	
+	// Start listening
+	radio.startListening();
+
+        
+	 while ( radio.available(&pipe) ) {
+
+		uint8_t len = radio.getDynamicPayloadSize();
+		radio.read( receivePayload, len );
+
+		// Display it on screen
+		printf("Recv: size=%i payload=%s pipe=%i",len,receivePayload,pipe);
+
+		// Send back payload to sender
+		radio.stopListening();
+
+		// if pipe is 7, do not send it back
+		if ( pipe != 7 ) {
+			radio.write(receivePayload,len);
+			receivePayload[len]=0;
+			printf("\t Send: size=%i payload=%s pipe:%i\n\r",len,receivePayload,pipe);
+		} else {
+			printf("\n\r");
+                }
+		pipe++;
+		// reset pipe to 0
+		if ( pipe > 6 ) pipe = 0;
+	}
+	usleep(20);
+}
+
+
+int main(int argc, char** argv) 
+{
+	setup();
+	while(1)
+		loop();
+	
+	return 0;
+}
+