faulty transmission/retrieval of bluetooth data

Projects Programming
21

just replace them with the 0 character (ASCII 48).

Or the space character (ASCII 32).

22

when I use your sketch like

void loop() {
recvWithEndMarker();
showNewData(); 
}

void recvWithEndMarker() {
    static byte ndx = 0;
    char endMarker = ';';
    char rc;
    
    while (mySerial.available() > 0 && newData == false) {
        rc = mySerial.read();

        if (rc != endMarker) {
            receivedChars[ndx] = rc;
            ndx++;
            if (ndx >= numChars) {
                ndx = numChars - 1;
            }
        }
        else {
            receivedChars[ndx] = '\0'; // terminate the string
            ndx = 0;
            newData = true;
        }
    }
}

void showNewData() {
    if (newData == true) {
        Serial.print("This just in ... ");
        Serial.println(receivedChars);
        newData = false;
    }
}

I get

This just in ... c:255,191,0
This just in ... c:255,191,0
This just in ... c:255,191,0
This just in ... c:255,191,0
This just in ... c:255,191,0
This just in ... c:255,191,0
This just in ... c:255,191,0
This just in ... c,0
This just in ... c:255,191,0
This just in ... c:255,1c:255,191,0
This just in ... c:255,191,0
This just in ... c:255,191,0
This just in ... c:255,191,0
This just in ... c:255,191,0
This just in ... c:255,c:255,191,0
This just in ... c:255,191,0
This just in ... c:255,191,0
This just in ... c:255,191,0
This just in ... c:255,191,0
23

You have not posted the complete program so I have no idea what pins you are using or what baud rate etc etc

I am tempted to say there is a problem with the incoming data, but I would like to see the whole program.

...R

24

I actually eventually got it to work with this

#include <SoftwareSerial.h>
SoftwareSerial mySerial(7,8); // RX, TX 

void setup() {
  Serial.begin(115200);
  mySerial.begin(57600); //required when using the hm-10 with an arduino nano
  mySerial.listen();
}
char data[20];
byte indx = 0;
void loop() {
  while (mySerial.available () > 0) {
    char d = mySerial.read();
    data[indx] = d;
    indx ++;
    if (d == ';') {
      Serial.println(data);
      data[0] = (char)0;
      indx = (byte)0;      
    }
  }
}

I still nee to implement strtok() and more but your link sent me in the right direction. Thank you so much.
I apologize if I was difficult to assist, but I greatly appreciate your help.

25

Ziayakens:
I actually eventually got it to work with this

That does not seem to be functionally different from my tutorial code.

There is a parse example in the tutorial.

...R