// Program to exercise the MD_MAX72XX library
// Test the library transformation functions
#include <MD_MAX72xx.h>
#include <SPI.h>
// We always wait a bit between updates of the display
#define  DELAYTIME  300  // in milliseconds
// Define the number of devices we have in the chain and the hardware interface
// NOTE: These pin numbers will probably not work with your hardware and may
// need to be adapted
#define HARDWARE_TYPE MD_MAX72XX::PAROLA_HW
#define MAX_DEVICES  4
#define CLK_PIN   13  // or SCK
#define DATA_PIN  11  // or MOSI
#define CS_PIN    10  // or SS
// SPI hardware interface
MD_MAX72XX mx = MD_MAX72XX(HARDWARE_TYPE, CS_PIN, MAX_DEVICES);
// Arbitrary pins
//MD_MAX72XX mx = MD_MAX72XX(HARDWARE_TYPE, DATA_PIN, CLK_PIN, CS_PIN, MAX_DEVICES);

// Global variables
uint32_t  lastTime = 0;
int diff = 0 ;
int diffcent = 0 ;
byte left = 28;
byte right = 7;
byte up = 0;

byte characters[][8] =  {
  {0x00, 0x00, 0x08, 0x1C, 0x2A, 0x49, 0x08, 0x08},
  {0x00, 0x08, 0x1C, 0x2A, 0x49, 0x08, 0x08, 0x00},
  {0x08, 0x1C, 0x2A, 0x49, 0x08, 0x08, 0x00, 0x00},
  {0x1C, 0x2A, 0x49, 0x08, 0x08, 0x00, 0x00, 0x00},
  {0x2A, 0x49, 0x08, 0x08, 0x00, 0x00, 0x00, 0x00}
};
//-------------------------------------------------------------
void setup() {
  pinMode(A0, INPUT);
  mx.begin();
  Serial.begin(115200);
  lastTime = millis();
  mx.control(MD_MAX72XX::UPDATE, MD_MAX72XX::ON);
}
//-------------------------------------------------------------
void showCharset(void) {
  mx.clear(1, 2);
  mx.control(MD_MAX72XX::UPDATE, MD_MAX72XX::OFF);
  //mx.update(MD_MAX72XX::OFF);
  char hex[3];
  sprintf(hex, "%02d", abs(diffcent));
  mx.clear(1);
  mx.setChar((2 * COL_SIZE) - 2, hex[1]);
  mx.clear(2);
  mx.setChar((3 * COL_SIZE) - 3, hex[0]);
  //mx.update();
  //  delay(DELAYTIME*2);
  mx.control(MD_MAX72XX::UPDATE, MD_MAX72XX::ON);
  //mx.update(MD_MAX72XX::ON);
}
//-------------------------------------------------------------
void runArrows(void) {
  if (diffcent > 10 ) {
    mx.control(MD_MAX72XX::UPDATE, MD_MAX72XX::OFF);
    mx.setChar(left, 27);
    mx.control(MD_MAX72XX::UPDATE, MD_MAX72XX::ON);
    mx.transform(3, 3, MD_MAX72XX::TSL);
    mx.clear(0, 0);
    left++;
    if (left > 32)
    {
      left = 28;
      mx.clear(3, 3);
    }
  }
  else if (diffcent < -10) {
    mx.control(MD_MAX72XX::UPDATE, MD_MAX72XX::OFF);
    mx.setChar(right, 26);
    mx.transform(0, 0, MD_MAX72XX::TSR);
    mx.control(MD_MAX72XX::UPDATE, MD_MAX72XX::ON);
    mx.clear(3, 3);
    right--;
    if (right < 3)
    {
      right = 7;
      mx.clear(0, 0);
    }
  }
  else {
    for (int i = 0; i < 8; i++) {
      mx.setRow(0, i, characters[up][i]);
      mx.setRow(3, i, characters[up][i]);
    }
    up++;
    if (up > 4)
    {
      up = 0;
    }
  }
}
//-------------------------------------------------------------
void loop() {
  int diff = analogRead(A0);
  diffcent = (diff - 500) / 10 ;
  //Serial.println(diffcent);
  if (millis() - lastTime >= DELAYTIME)
  {
    showCharset();
    runArrows();
    //delay(200);
    lastTime = millis();
  }
}