TFT show formula

TFT show formula.ino

#include <stdint.h>
#include <TouchScreen.h> 
#include <TFT.h>

#define YP A2   // must be an analog pin, use "An" notation!
#define XM A1   // must be an analog pin, use "An" notation!
#define YM 14   // can be a digital pin, this is A0
#define XP 17   // can be a digital pin, this is A3 

// String msg = "Hello String";
int colors[] = {RED,GREEN,YELLOW, WHITE};
char msg[] = "=SUM(A1:A15)";
char c[] = "x" ;
int w=18;
int h=30;
int cols=320/w;
int color = WHITE;

void setup() {
  Tft.init(); 
  Tft.setDisplayDirect(DOWN2UP);

  for (int i=0; i<sizeof(msg); i++) {
    c[0] = msg[i];
    color = (i>4 && i<11) ? YELLOW : WHITE;
    Tft.drawString(c,(i/cols)*h,320-(i%cols)*w,3,color);
  }

}

void loop()
{
  

}