How I can populate a buffer from data read from SPI?

Question

I have wired a Macronix MX35LF1GE4AB Flash memory into an arduino Uno using Logic Level Shifters. What I try to do with it is to dump its contents.

In order to do so, I am implementing the following sketch:

#include <SPI.h> 

#define LASTBLOCK 1023
#define LASTPAGE 63
#define LASTBYTE 2111

#define PAGE_READ 13h
#define PAGE_READ_CACHE_SEQUENCIAL 03h
#define READ_FROM_CACHE 3Bh
#define PAGE_READ_CACHE_END 3Fh

#define BUFFER_LEN 2111 

int page_to_read = 1;
int block_to_read = 1;

// We store each page to Microcontroiller's ram
byte buffer[BUFFER_LEN]; 

void setup() {
 SPI.beginTransaction(SPISettings(14000000, MSBFIRST, SPI_MODE0));
// Serial.begin(9600);
}

void loop() {

  // I need to reset the counts before reading any block 
  if(page_to_read > LASTPAGE){
    page_to_read = 1;
    block_to_read ++;
    
  }

  if(block_to_read > LASTBLOCK){
    return ;
  }

  if(page_to_read == LASTPAGE){
     SPI.transfer(PAGE_READ_CACHE_END);
  } else if (page_to_read == 1) {
     SPI.transfer(PAGE_READ);
     SPI.transfer(PAGE_READ_CACHE_SEQUENCIAL);
  }

  SPI.transfer(READ_FROM_CACHE);
  
    
  page_to_read++;
}

Now what I want is to populate the buffer byte buffer[BUFFER_LEN] with data, so I can send them over a serial port.

How I can achieve that?

Answer 1

#define BUFFER_LEN 2111 
byte buffer[BUFFER_LEN];

That will definitely not work because the Uno has 2048 bytes of RAM, some of which are needed by the system. The serial buffers, for example, are 64 bytes each.