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authorkrolyxon <me@krolyxon.com>2026-06-08 23:10:46 +0530
committerkrolyxon <me@krolyxon.com>2026-06-08 23:10:46 +0530
commit3120783000d0025b183b0397acaa8b769499eb38 (patch)
tree1c4f93be213f1b1d48f59e554562d847b4e7c25e /.pio/libdeps/esp32-s3-n16r8/RF24/examples/AcknowledgementPayloads
Initial gh-pages firmware hosting
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+/*
+ * See documentation at https://nRF24.github.io/RF24
+ * See License information at root directory of this library
+ * Author: Brendan Doherty (2bndy5)
+ */
+
+/**
+ * A simple example of sending data from 1 nRF24L01 transceiver to another
+ * with Acknowledgement (ACK) payloads attached to ACK packets.
+ *
+ * This example was written to be used on 2 devices acting as "nodes".
+ * Use the Serial Monitor to change each node's behavior.
+ */
+#include <SPI.h>
+#include "printf.h"
+#include "RF24.h"
+
+#define CE_PIN 7
+#define CSN_PIN 8
+// instantiate an object for the nRF24L01 transceiver
+RF24 radio(CE_PIN, CSN_PIN);
+
+// an identifying device destination
+// Let these addresses be used for the pair
+uint8_t address[][6] = { "1Node", "2Node" };
+// It is very helpful to think of an address as a path instead of as
+// an identifying device destination
+// to use different addresses on a pair of radios, we need a variable to
+
+// uniquely identify which address this radio will use to transmit
+bool radioNumber = 1; // 0 uses address[0] to transmit, 1 uses address[1] to transmit
+
+// Used to control whether this node is sending or receiving
+bool role = false; // true = TX role, false = RX role
+
+// For this example, we'll be using a payload containing
+// a string & an integer number that will be incremented
+// on every successful transmission.
+// Make a data structure to store the entire payload of different datatypes
+struct PayloadStruct {
+ char message[7]; // only using 6 characters for TX & ACK payloads
+ uint8_t counter;
+};
+PayloadStruct payload;
+
+void setup() {
+
+ Serial.begin(115200);
+ while (!Serial) {
+ // some boards need to wait to ensure access to serial over USB
+ }
+
+ // initialize the transceiver on the SPI bus
+ if (!radio.begin()) {
+ Serial.println(F("radio hardware is not responding!!"));
+ while (1) {} // hold in infinite loop
+ }
+
+ // print example's introductory prompt
+ Serial.println(F("RF24/examples/AcknowledgementPayloads"));
+
+ // To set the radioNumber via the Serial monitor on startup
+ Serial.println(F("Which radio is this? Enter '0' or '1'. Defaults to '0'"));
+ while (!Serial.available()) {
+ // wait for user input
+ }
+ char input = Serial.parseInt();
+ radioNumber = input == 1;
+ Serial.print(F("radioNumber = "));
+ Serial.println((int)radioNumber);
+
+ // role variable is hardcoded to RX behavior, inform the user of this
+ Serial.println(F("*** PRESS 'T' to begin transmitting to the other node"));
+
+ // Set the PA Level low to try preventing power supply related problems
+ // because these examples are likely run with nodes in close proximity to
+ // each other.
+ radio.setPALevel(RF24_PA_LOW); // RF24_PA_MAX is default.
+
+ // to use ACK payloads, we need to enable dynamic payload lengths (for all nodes)
+ radio.enableDynamicPayloads(); // ACK payloads are dynamically sized
+
+ // Acknowledgement packets have no payloads by default. We need to enable
+ // this feature for all nodes (TX & RX) to use ACK payloads.
+ radio.enableAckPayload();
+
+ // set the TX address of the RX node for use on the TX pipe (pipe 0)
+ radio.stopListening(address[radioNumber]); // put radio in TX mode
+
+ // set the RX address of the TX node into a RX pipe
+ radio.openReadingPipe(1, address[!radioNumber]); // using pipe 1
+
+ // additional setup specific to the node's role
+ if (role) {
+ // setup the TX payload
+ memcpy(payload.message, "Hello ", 6); // set the payload message
+ } else {
+ // setup the ACK payload & load the first response into the FIFO
+
+ memcpy(payload.message, "World ", 6); // set the payload message
+ // load the payload for the first received transmission on pipe 0
+ radio.writeAckPayload(1, &payload, sizeof(payload));
+
+ radio.startListening(); // put radio in RX mode
+ }
+
+ // For debugging info
+ // printf_begin(); // needed only once for printing details
+ // radio.printDetails(); // (smaller) function that prints raw register values
+ // radio.printPrettyDetails(); // (larger) function that prints human readable data
+}
+
+void loop() {
+
+ if (role) {
+ // This device is a TX node
+
+ unsigned long start_timer = micros(); // start the timer
+ bool report = radio.write(&payload, sizeof(payload)); // transmit & save the report
+ unsigned long end_timer = micros(); // end the timer
+
+ if (report) {
+ Serial.print(F("Transmission successful! ")); // payload was delivered
+ Serial.print(F("Time to transmit = "));
+ Serial.print(end_timer - start_timer); // print the timer result
+ Serial.print(F(" us. Sent: "));
+ Serial.print(payload.message); // print the outgoing message
+ Serial.print(payload.counter); // print the outgoing counter
+ uint8_t pipe;
+ if (radio.available(&pipe)) { // is there an ACK payload? grab the pipe number that received it
+ PayloadStruct received;
+ radio.read(&received, sizeof(received)); // get incoming ACK payload
+ Serial.print(F(" Received "));
+ Serial.print(radio.getDynamicPayloadSize()); // print incoming payload size
+ Serial.print(F(" bytes on pipe "));
+ Serial.print(pipe); // print pipe number that received the ACK
+ Serial.print(F(": "));
+ Serial.print(received.message); // print incoming message
+ Serial.println(received.counter); // print incoming counter
+
+ // save incoming counter & increment for next outgoing
+ payload.counter = received.counter + 1;
+
+ } else {
+ Serial.println(F(" Received: an empty ACK packet")); // empty ACK packet received
+ }
+
+
+ } else {
+ Serial.println(F("Transmission failed or timed out")); // payload was not delivered
+ }
+
+ // to make this example readable in the serial monitor
+ delay(1000); // slow transmissions down by 1 second
+
+ } else {
+ // This device is a RX node
+
+ uint8_t pipe;
+ if (radio.available(&pipe)) { // is there a payload? get the pipe number that received it
+ uint8_t bytes = radio.getDynamicPayloadSize(); // get the size of the payload
+ PayloadStruct received;
+ radio.read(&received, sizeof(received)); // get incoming payload
+ Serial.print(F("Received "));
+ Serial.print(bytes); // print the size of the payload
+ Serial.print(F(" bytes on pipe "));
+ Serial.print(pipe); // print the pipe number
+ Serial.print(F(": "));
+ Serial.print(received.message); // print incoming message
+ Serial.print(received.counter); // print incoming counter
+ Serial.print(F(" Sent: "));
+ Serial.print(payload.message); // print outgoing message
+ Serial.println(payload.counter); // print outgoing counter
+
+ // save incoming counter & increment for next outgoing
+ payload.counter = received.counter + 1;
+ // load the payload for the first received transmission on pipe 0
+ radio.writeAckPayload(1, &payload, sizeof(payload));
+ }
+ } // role
+
+ if (Serial.available()) {
+ // change the role via the serial monitor
+
+ char c = toupper(Serial.read());
+ if (c == 'T' && !role) {
+ // Become the TX node
+
+ role = true;
+ Serial.println(F("*** CHANGING TO TRANSMIT ROLE -- PRESS 'R' TO SWITCH BACK"));
+
+ memcpy(payload.message, "Hello ", 6); // change payload message
+ radio.stopListening(); // this also discards any unused ACK payloads
+
+ } else if (c == 'R' && role) {
+ // Become the RX node
+
+ role = false;
+ Serial.println(F("*** CHANGING TO RECEIVE ROLE -- PRESS 'T' TO SWITCH BACK"));
+ memcpy(payload.message, "World ", 6); // change payload message
+
+ // load the payload for the first received transmission on pipe 0
+ radio.writeAckPayload(1, &payload, sizeof(payload));
+ radio.startListening();
+ }
+ }
+} // loop