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arduino-cli/libraries/RF24/examples_linux/pingpair_dyn.cpp

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+/*
+	TMRh20 2014 - Optimized RF24 Library Fork
+*/
+
+/**
+ * Example using Dynamic Payloads
+ *
+ * This is an example of how to use payloads of a varying (dynamic) size.
+ */
+
+#include <cstdlib>
+#include <iostream>
+#include <sstream>
+#include <string>
+#include "./RF24.h"
+
+using namespace std;
+//
+// Hardware configuration
+// Configure the appropriate pins for your connections
+
+/****************** Linux ***********************/
+// Radio CE Pin, CSN Pin, SPI Speed
+// CE Pin uses GPIO number with BCM and SPIDEV drivers, other platforms use their own pin numbering
+// CS Pin addresses the SPI bus number at /dev/spidev<a>.<b>
+// ie: RF24 radio(<ce_pin>, <a>*10+<b>); spidev1.0 is 10, spidev1.1 is 11 etc..
+
+// Generic:
+RF24 radio(22,0);
+
+/****************** Linux (BBB,x86,etc) ***********************/
+// See http://tmrh20.github.io/RF24/pages.html for more information on usage
+// See http://iotdk.intel.com/docs/master/mraa/ for more information on MRAA
+// See https://www.kernel.org/doc/Documentation/spi/spidev for more information on SPIDEV
+
+/**************************************************************/
+
+// Radio pipe addresses for the 2 nodes to communicate.
+const uint64_t pipes[2] = {0xF0F0F0F0E1LL, 0xF0F0F0F0D2LL};
+
+const int min_payload_size = 4;
+const int max_payload_size = 32;
+const int payload_size_increments_by = 1;
+int next_payload_size = min_payload_size;
+
+char receive_payload[max_payload_size + 1]; // +1 to allow room for a terminating NULL char
+
+int main(int argc, char** argv)
+{
+
+    bool role_ping_out = 1, role_pong_back = 0;
+    bool role = 0;
+
+    // Print preamble:
+    cout << "RF24/examples/pingpair_dyn/\n";
+
+    // Setup and configure rf radio
+    radio.begin();
+    radio.enableDynamicPayloads();
+    radio.setRetries(5, 15);
+    radio.printDetails();
+
+
+    /********* Role chooser ***********/
+
+    printf("\n ************ Role Setup ***********\n");
+    string input = "";
+    char myChar = {0};
+    cout << "Choose a role: Enter 0 for receiver, 1 for transmitter (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;
+        }
+    }
+    /***********************************/
+
+    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) {
+            // The payload will always be the same, what will change is how much of it we send.
+            static char send_payload[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ789012";
+
+            // First, stop listening so we can talk.
+            radio.stopListening();
+
+            // Take the time, and send it.  This will block until complete
+            printf("Now sending length %i...", next_payload_size);
+            radio.write(send_payload, next_payload_size);
+
+            // Now, continue listening
+            radio.startListening();
+
+            // Wait here until we get a response, or timeout
+            unsigned long started_waiting_at = millis();
+            bool timeout = false;
+            while (!radio.available() && !timeout) {
+                if (millis() - started_waiting_at > 500) {
+                    timeout = true;
+                }
+            }
+
+            // Describe the results
+            if (timeout) {
+                printf("Failed, response timed out.\n\r");
+            } else {
+                // Grab the response, compare, and send to debugging spew
+                uint8_t len = radio.getDynamicPayloadSize();
+                radio.read(receive_payload, len);
+
+                // Put a zero at the end for easy printing
+                receive_payload[len] = 0;
+
+                // Spew it
+                printf("Got response size=%i value=%s\n\r", len, receive_payload);
+            }
+
+            // Update size for next time.
+            next_payload_size += payload_size_increments_by;
+            if (next_payload_size > max_payload_size) {
+                next_payload_size = min_payload_size;
+            }
+
+            // Try again 1s later
+            delay(100);
+        }
+
+        //
+        // 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
+                uint8_t len = 0;
+
+                while (radio.available()) {
+                    // Fetch the payload, and see if this was the last one.
+                    len = radio.getDynamicPayloadSize();
+                    radio.read(receive_payload, len);
+
+                    // Put a zero at the end for easy printing
+                    receive_payload[len] = 0;
+
+                    // Spew it
+                    printf("Got payload size=%i value=%s\n\r", len, receive_payload);
+                }
+
+                // First, stop listening so we can talk
+                radio.stopListening();
+
+                // Send the final one back.
+                radio.write(receive_payload, len);
+                printf("Sent response.\n\r");
+
+                // Now, resume listening so we catch the next packets.
+                radio.startListening();
+            }
+        }
+    }
+}
+
+