Pushing values to array

Projects Programming
13

Ok,

So I've been looking into circular buffers, an interesting and useful concept I can use in the future.
For my current project I think I'll stick with the code I have:
HDD Motor Scrollwheel - working but room for improvement]

@jfjlaros Sorry man, thanks for the help but your code is just too advanced for me at this point

I did however write code based on the circular buffer concept. It works and fits my need. I'll give implementing it into my project a thought. See the code below.

Thanks for the input to all for now, I've learned enough.

The only thing I have not figured out is what '% n' does or means. I could not google "%n" so what is that method / notation called? Thanks.

#include <Streaming.h>

#define BUFLEN 5                // Length of buffer

int buf[BUFLEN];                // Define buffer
int writeIndex = 0;             // Index at which a new value should be written to
int readFrom;                   // Start index of reading 
long multiplier;                // Used in get() to caculate result, long so BUFLEN can be 5 or more
long result;                    // Returned from get()
int val;                        // New value to be stored 


void setup()
{
  Serial.begin(115200);
}


void loop()
{
  val = random(1, 7);
  
  put(val);
  
  Serial << "New value has been put in: " << val << endl;

  Serial << "The values in sequence of input: "  << endl;
  
  Serial << get() << endl;
  
  delay(1500);
}


void put(int item)
{
  writeIndex++;                                         // Increment write index
  
  if(writeIndex == BUFLEN) writeIndex = 0;              // Set back to zero if 'out of index' is reached
  
  buf[writeIndex] = item;                               // Save/store value
}


long get()                                              // Long because return can be > 65000
{
  readFrom = writeIndex;                                // Start reading from the index of the last written value 
  
  multiplier = 1;                                       // Set multiplier for the first read value
  
  result = 0;                                           // Reset result to zero

  for(int i = 0; i < BUFLEN; i++)                       // Read entries of whole buffer
  {    
    result += buf[readFrom] * multiplier;               // Buffer 641, result: 1*1 + 10*4 + 100*6 = 641
    
    multiplier = multiplier * 10;
    
    readFrom--;                                         // Go backward through the buffer
    
    if(readFrom == -1) readFrom = BUFLEN - 1;           // If index < 0 got to end
  }
    
  return result;
}