SainSmart TFT + 86Duino

SainSmartTFT.ino

#include <TFT.h>
#include <SPI.h>
 
#define TFT_CS  42
#define TFT_DC   43
#define TFT_RST  0
#define TFT_SCLK  0
#define TFT_MOSI  0
 
TFT screen = TFT(TFT_CS, TFT_DC, TFT_RST);  // for UNO
/// TFT screen = TFT(TFT_CS, TFT_DC, TFT_MOSI, TFT_SCLK, TFT_RST);  // for Leonardo
 
void setup(void) {
//    Serial.begin(9600); while(!Serial);
//    Serial.println("START");
 
  screen.begin();
//  SPI.setClockDivider(SPI_CLOCK_DIV2);  // SPI speed
    SPI.setClockDivider(2);  // SPI speed 100/(2*n) MHz
  screen.background(0,0,0);
  screen.fill(255,255,255);
    
}
 
const int XMAX=ST7735_TFTHEIGHT;
const int YMAX=ST7735_TFTWIDTH;
 
unsigned long counter=0;
 
void loop() {
  int x1,y1,x2,y2,r,g,b;
  unsigned long stime,etime;
  
  stime=millis();
  for(int i=1;i<=1000;i++) {
    r=random(256); g=random(256); b=random(256);
    x1=random(0,XMAX);
    y1=random(0,YMAX);
    x2=random(0,XMAX);
    y2=random(0,YMAX);
    screen.stroke(r,g,b);
    screen.line(x1,y1,x2,y2); // line ... hang 01m02s
///    screen.line(x1,y1,x1,y2); // verticalline ... hang 01m05s
///    screen.line(x1,y1,x2,y1); // horizonalline ... hang 02m56s
///    screen.point(x1,y1); // dot ... hang
///    delay(10); // ... hang
 
  }
  etime=millis();
  counter++;
  // Serial.println(counter);
}