// 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 ;

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(28, 27);
    mx.control(MD_MAX72XX::UPDATE, MD_MAX72XX::ON);
    mx.transform(3,3,MD_MAX72XX::TSL);
    mx.clear(0,0);
    }
 else if (diffcent < -10) {
    mx.control(MD_MAX72XX::UPDATE, MD_MAX72XX::OFF);
    mx.setChar(7, 26);
    mx.transform(0,0,MD_MAX72XX::TSR);
    mx.control(MD_MAX72XX::UPDATE, MD_MAX72XX::ON);
    mx.clear(3,3);
    }
 else {
           mx.control(MD_MAX72XX::UPDATE, MD_MAX72XX::OFF);
      mx.setChar (7, 24);
      mx.setChar (29, 24);
      mx.transform(3,3,MD_MAX72XX::TSU);
      mx.transform(0,0,MD_MAX72XX::TSU);
      mx.control(MD_MAX72XX::UPDATE, MD_MAX72XX::ON);
      //mx.update();
      }   
}

void loop() {
 int diff =analogRead(A0);
 diffcent = (diff - 500) / 10 ; 
 Serial.println(diffcent);
  if (millis() - lastTime >= DELAYTIME)
  {
  showCharset();
  runArrows();
  //delay(200);
  lastTime = millis();
  } 
}