Strange buffering behavior

[tv4you2016]

Hello @rlogiacco
See the behavior of this little code. the first time does not empty the buffer.
can you help me to pray what is wrong?

#include <Arduino.h>
#include <CircularBuffer.h>

void setup() {
  Serial0.begin(115200);
  Serial0.println("Serial Txd is on pin: " + String(TX));
  Serial0.println("Serial Rxd is on pin: " + String(RX));
  Serial0.setDebugOutput(true);
}

void loop(){
  bufferRx.push(84);
  bufferRx.push(5);
  bufferRx.push(0);
  bufferRx.push(100);
  bufferRx.push(0);
  bufferRx.push(15); 
  bufferRx.push(106);
  Serial0.println("-------ADD-------");
  printBufferRx();
  for (decltype(bufferRx)::index_t i = 0; i < bufferRx.size() - 1; i++) {
    bufferRx.shift();
  }

  Serial0.println("-------END-------");
  printBufferRx();

  delay(2000);
}

LOG:

17:11:10.620 > Serial Txd is on pin: 43
17:11:10.620 > Serial Rxd is on pin: 44
17:11:10.620 > -------ADD-------
17:11:10.620 > [84,5,0,100,0,15,106] (7/255)
17:11:10.620 > -------END-------
17:11:10.620 > [100,0,15,106] (4/255)  <- **Here it deviates it is clear**
17:11:12.619 > -------ADD-------
17:11:12.619 > [100,0,15,106,84,5,0,100,0,15,106] (11/255)
17:11:12.624 > -------END-------
17:11:12.624 > [5,0,100,0,15,106] (6/255)
17:11:14.620 > -------ADD-------
17:11:14.620 > [5,0,100,0,15,106,84,5,0,100,0,15,106] (13/255)      
17:11:14.626 > -------END-------
17:11:14.626 > [84,5,0,100,0,15,106] (7/255)
17:11:16.621 > -------ADD-------
17:11:16.621 > [84,5,0,100,0,15,106,84,5,0,100,0,15,106] (14/255)   
17:11:16.626 > -------END-------
17:11:16.626 > [84,5,0,100,0,15,106] (7/255)
17:11:18.622 > -------ADD-------
17:11:18.622 > [84,5,0,100,0,15,106,84,5,0,100,0,15,106] (14/255)   
17:11:18.628 > -------END-------
17:11:18.628 > [84,5,0,100,0,15,106] (7/255)
17:11:20.623 > -------ADD-------
17:11:20.623 > [84,5,0,100,0,15,106,84,5,0,100,0,15,106] (14/255)   
17:11:20.629 > -------END-------
17:11:20.629 > [84,5,0,100,0,15,106] (7/255)

[rlogiacco]

  for (decltype(bufferRx)::index_t i = 0; i < bufferRx.size() - 1; i++) { // <-- check the loop condition
    bufferRx.shift();
  }

Here you are leaving one entry at the beginning of your buffer because you iterate up to size -1 and the condition is "strictly less than"... so after each loop you are leaving one additional entry at the beginning. If you want to ensure the buffer is cleared after you print it, you should call the clear() method.

I do not understand what you are trying to do with the buffer, if you need further assistance please explain what is the expected behaviour or status of the buffer.

Also, it would be useful to see the implementation of your printBufferRx method.