I was trying a simple chat example using 2 nRF24L01 and two Arduino Uno boards. My code is as below. I am getting some errors. When I run code I am getting errors as below.
//
nRF24_Serial_Chat.ino: In function 'void nRF_receive()':
nRF24_Serial_Chat:110: error: void value not ignored as it ought to be
//
I have shared the code.
Please guys help me to get rid of the error. Its urgent.
/*
nRF Serial Chat
this simple interactive serial chat over nRF that can be used for both sender
and receiver as I swapped the TX & RX addr during read/write operation.
It read input from Serial Monitor and display the output to the other side
Serial Monitor or 16x2 LCD (if available)... like a simple chat program.
Max payload is 32 bytes for radio but the serialEvent will chopped the entire buffer
for next payload to be sent out sequentially.
*/
#include <LiquidCrystal.h>
#include <SPI.h>
#include "nRF24L01.h"
#include "RF24.h"
#include "printf.h"
LiquidCrystal lcd(10, 7, 3, 4, 5, 6);
RF24 radio(8,9);
const uint64_t pipes[2] = { 0xDEDEDEDEE7LL, 0xDEDEDEDEE9LL };
boolean stringComplete = false; // whether the string is complete
static int dataBufferIndex = 0;
boolean stringOverflow = false;
char charOverflow = 0;
char SendPayload[31] = "";
char RecvPayload[31] = "";
char serialBuffer[31] = "";
void setup(void) {
Serial.begin(57600);
lcd.begin(16,2);
lcd.clear();
lcd.setCursor(0,0);
lcd.print("RF Chat V0.90");
printf_begin();
radio.begin();
radio.setDataRate(RF24_250KBPS);
radio.setPALevel(RF24_PA_MAX);
radio.setChannel(70);
radio.enableDynamicPayloads();
radio.setRetries(15,15);
radio.setCRCLength(RF24_CRC_16);
radio.openWritingPipe(pipes[0]);
radio.openReadingPipe(1,pipes[1]);
radio.startListening();
radio.printDetails();
Serial.println();
Serial.println("RF Chat V0.90");
delay(500);
lcd.clear();
}
void loop(void) {
nRF_receive();
serial_receive();
} // end loop()
void serialEvent() {
while (Serial.available() > 0 ) {
char incomingByte = Serial.read();
if (stringOverflow) {
serialBuffer[dataBufferIndex++] = charOverflow; // Place saved overflow byte into buffer
serialBuffer[dataBufferIndex++] = incomingByte; // saved next byte into next buffer
stringOverflow = false; // turn overflow flag off
} else if (dataBufferIndex > 31) {
stringComplete = true; // Send this buffer out to radio
stringOverflow = true; // trigger the overflow flag
charOverflow = incomingByte; // Saved the overflow byte for next loop
dataBufferIndex = 0; // reset the bufferindex
break;
}
else if(incomingByte=='\n'){
serialBuffer[dataBufferIndex] = 0;
stringComplete = true;
} else {
serialBuffer[dataBufferIndex++] = incomingByte;
serialBuffer[dataBufferIndex] = 0;
}
} // end while()
} // end serialEvent()
void nRF_receive(void) {
int len = 0;
if ( radio.available() ) {
bool done = false;
while ( !done ) {
len = radio.getDynamicPayloadSize();
done = radio.read(&RecvPayload,len);
delay(5);
}
RecvPayload[len] = 0; // null terminate string
lcd.setCursor(0,0);
lcd.print("R:");
Serial.print("R:");
lcd.setCursor(2,0);
lcd.print(RecvPayload);
Serial.print(RecvPayload);
Serial.println();
RecvPayload[0] = 0; // Clear the buffers
}
} // end nRF_receive()
void serial_receive(void){
if (stringComplete) {
strcat(SendPayload,serialBuffer);
// swap TX & Rx addr for writing
radio.openWritingPipe(pipes[1]);
radio.openReadingPipe(0,pipes[0]);
radio.stopListening();
bool ok = radio.write(&SendPayload,strlen(SendPayload));
lcd.setCursor(0,1);
lcd.print("S:");
Serial.print("S:");
lcd.setCursor(2,1);
lcd.print(SendPayload);
Serial.print(SendPayload);
Serial.println();
stringComplete = false;
// restore TX & Rx addr for reading
radio.openWritingPipe(pipes[0]);
radio.openReadingPipe(1,pipes[1]);
radio.startListening();
SendPayload[0] = 0;
dataBufferIndex = 0;
} // endif
} // end serial_receive()
