flashlog testing

flashLOG.cpp

#include "flashLOG.h"

flashLOG::flashLOG(char *filename)
{
  _logfilename = filename;
}

void flashLOG::start() {
  if (!LittleFS.begin())
  {
    Serial.println("LittleFS mount failed");
  }
  else {
    Serial.println("MOUNTED OK");
  }
}
void flashLOG::read() {
  int r = 0;
  int c = 0;

  File file = LittleFS.open(_logfilename, "r");
  if (!file)
  {
    Serial.println("Failed to open file for reading");
  }
  else {
    while (file.available())
    {
      char tt = file.read();
           if (tt != '\n')
           {
               _log_array[r][c] = tt;
               c++;
           }
           else
           {
               _log_array[r][c] = '\n';
               r++;
               c = 0;
               // Serial.println(_log_array[r-1]);
           }
      Serial.write(tt);
    }
  }
  file.close();
  //     return r;

}
void flashLOG::write(const char *message)
{
  char a[_log_length];
  //     sprintf(a, "%s\n", message);

  File file = LittleFS.open(_logfilename, "a");
  if (!file)
  {
    Serial.println("Failed to open file for appending");
  }
  else {
    if (file.print(message)) {
      Serial.println("Append OK");
    }
    else {
      Serial.println("Append fail");
    }
  }
  Serial.printf("file size: %d\n", file.size());
  delay(2000);
  file.close();
}
void flashLOG::append(const char *message)
{
  char a[_log_length];
  //     sprintf(a, "%s\n", message);

  File file = LittleFS.open(_logfilename, "a");
  if (!file)
  {
    Serial.println("Failed to open file for appending");
  }
  else {
    if (file.print(message)) {
      Serial.println("Append OK");
    }
    else {
      Serial.println("Append fail");
    }
  }
  Serial.printf("file size: %d\n", file.size());
  //     delay(2000);
  file.close();
}
void flashLOG::postlog(int x)
{
  int num_lines = 0;//read();
  int y = min(x, num_lines);
  for (int a = 0; a < y; a++)
  {
    if (y > 1)
    {
      char t[_log_length];
      sprintf(t, "[#%d] %s", a, _log_array[a]);
      Serial.println(t);
    }
    else
    {
      Serial.println(_log_array[a]);
    }
  }
}
int flashLOG::sizelog()
{
  File file = LittleFS.open(_logfilename, "r");
  int f = file.size();
  file.close();
  return f;
}

flashLOG.h

#ifndef FLASH_LOG
#define FLASH_LOG
#include <FS.h>
#include <LittleFS.h>

class flashLOG {
  private:
    char *_logfilename;
    int _log_length;
    char _log_array[50][50];

  public:
    flashLOG(char *filename) ;
    void start();
    void read();
    void write(const char *message);
    void append(const char *message);
    void postlog(int x);
    int sizelog();
};
#endif

flashlog_test.ino

#include <FS.h>
#include <LittleFS.h>
#include "flashLOG.h"

char logName[] = "log.txt";
flashLOG logFile(logName);

void setup() {
  Serial.begin(115200);
  Serial.println("Mount LittleFS");

  if (!LittleFS.begin()) {
    Serial.println("LittleFS mount failed");
    Serial.println("Formatting LittleFS filesystem");
    LittleFS.format();
    Serial.println("Restarting to try again");
    ESP.restart();
    delay(100);
    return;
  }

  Serial.println("=== Prior events in flashLOG ===");
  logFile.read();

  logFile.write("setup complete!");

}

void loop() {

  for (int i = 0; i < 5; i++) {
    logFile.write("loop!");
    delay(500);
  }
  ESP.restart();
  delay(100);
}

serial_output.txt

 ets Jan  8 2013,rst cause:2, boot mode:(3,6)

load 0x4010f000, len 3584, room 16 
tail 0
chksum 0xb0
csum 0xb0
v2843a5ac
~ld
Mount LittleFS
Append OK
file size: 55
Append OK
file size: 60
Append OK
file size: 65
Append OK
file size: 70
Append OK
file size: 75
Append OK
file size: 80

 ets Jan  8 2013,rst cause:2, boot mode:(3,6)

load 0x4010f000, len 3584, room 16 
tail 0
chksum 0xb0
csum 0xb0
v2843a5ac
~ld
Mount LittleFS
Append OK
file size: 95
Append OK
file size: 100
Append OK
file size: 105
Append OK
file size: 110
Append OK
file size: 115
Append OK
file size: 120

 ets Jan  8 2013,rst cause:2, boot mode:(3,6)

load 0x4010f000, len 3584, room 16 
tail 0
chksum 0xb0
csum 0xb0
v2843a5ac
~ld
Mount LittleFS
Append OK
file size: 135
Append OK
file size: 140
Append OK
file size: 145
Append OK
file size: 150
Append OK
file size: 155
Append OK
file size: 160