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【原理】从零编写ILI9341驱动全过程(基于Arduino)

lyj00912 人气:0

最近在淘宝入手了一块ILI9341彩色屏幕,支持320x240分辨率。之前一直很好奇这类单片机驱动的彩色屏幕的原理,就打算自己写一个驱动,从电流层面操控ILI9341屏幕。话不多说,我们开始吧( ̄▽ ̄)~*

1.ILI9341芯片和ILI9341驱动板

首先这里要明确两个概念,ILI9341芯片和ILI9341驱动板。

ILI9341芯片是ilitek发布的液晶驱动芯片,是这个样子的:

而淘宝上的ILI9341驱动板是把ILI9341芯片、屏幕和针脚焊接在一起的电路板,它可能是这个样子的:

 

也可能是这个样子的:

 

 还可能是这个样子的:

 

没错,不同的厂家可以制造不同形状,不同接口的ILI9341驱动板,但他们上面都有ILI9341芯片,所以我们可以用相同的方法操作它。

2.如何操作它呢?

这是ILI9341驱动板的背面,我在上面做了些标注,应该会方便理解些。我们只要控制这些针脚的通电与否(高电平与低电平),就能够获得操控这块屏幕的“完整权限”!那这些针脚的定义是什么呢?我们一个一个看:

左上角有五个最重要的针脚,分别是LCD_RST、LCD_CS、LCD_RS、LCD_WR和LCD_RD:(直接用文字写不能冒号对齐,没办法,开个代码框( ̄▽ ̄)~*)

LCD_RST : 即LCD Reset,用于在通电之后复位,初始化整个模块。

LCD_CS  : 即LCD Chip Select,用于多个芯片之间的片选操作。由于这块驱动板只有一个可用的芯片,所以一般该针脚不通电。

LCD_RS  : 又称D/CX信号线,用于切换写命令(Command)和写数据(Data),当对显示屏写命令(Command)时,应该让针脚不通电,当对显示屏写数据(Data)时,应该让针脚通电。

LCD_WR  : 写使能。当LCD_WR不通电,并且LCD_RD通电时,数据传输方向为写入。

LCD_RD  : 读使能。

左下角的针脚负责供电,不细讲。

右上角的LCD_D0到LCD_D7是数据脚,通过控制它的通电与否来传输8个比特,也就是8个0或1。这种方式可以传输一个最小值0,最大值255的数字,我们用它来传输所有命令和数据。

右下角的SD_SS,SD_DI,SD_D0,SD_SCK适用于控制SD卡读写的,不属于ILI9341的范畴,我们先不讨论。

那么,如何操作它呢?这张图能够很清楚的说明:(下面用拉低代表示不通电,拉高表示通电,这样术语会更加标准)

 

  • 单片机开机,ILI9341驱动板接收到电流,开始进入待命状态
  • 拉低LCD_CS片选信号,选择对ILI9341芯片发送命令
  • 通过拉高拉低LCD_D0到LCD_D7数据脚,来表示二进制数据
  • 拉低拉高LCD_RS针脚来告诉机器这是一个命令,还是一个数据
  • 拉低LCD_WR,进行写使能(可以理解为按下回车键,把LCD_D0到D7的数据发送出去)

这就是发送一个命令或者数据的方法。二进制,十进制和十六进制的转换和表达先直接略过,如果要展开,那可能可以出一本书了( • ̀ω•́ )✧,关于LCD_D0到D7脚应该发送什么,ILITEK在设计ILI9341时就已经规定好了,中文文档在此:

接下来,就是,愉快的,编码时间啦( • ̀ω•́ )✧!!!

3.兼容性设定

不知刚才你有没有注意到数据脚是从LCD_D2开始的?那是因为Arduino Uno开发板的第0和1脚是USB针脚,不能被使用,只能从第2个针脚开始设计:

那我们在编程时要用到LCD_D0和LCD_D1时,就必须写成8和9。另外不同机器脚位也不一样,所以我用宏定义来简化程序:

#define LCD_D0   8
#define LCD_D1   9
#define LCD_D2   2
#define LCD_D3   3
#define LCD_D4   4
#define LCD_D5   5
#define LCD_D6   6
#define LCD_D7   7
#define LCD_RD   A0
#define LCD_WR   A1
#define LCD_RS   A2
#define LCD_CS   A3
#define LCD_RST  A4

这样即解决了LCD_D0和LCD_D1脚的问题,还搞定的不同开发板的兼容性问题。由于#define是在预编译阶段生成的,所以不会影响代码运行的速度。

4.发送命令和数据

调用这块屏幕的方法很明确,就是写入2进制数字。通过设计厂商提供的命令表发送相应的2进制命令和数据,实现操控。这样做的好处是无论你使用的是什么机器,什么驱动板,只要实现了LcdWriteCommand()和LcdWriteData()两个函数,就可以实现对屏幕的完全控制。

你当然可以用最直接的办法去控制引脚,比如digitalWrite():

void LcdWriteCommand(unsigned char d){
  //Write Command Mode On
  digitalWrite(LCD_RS,LOW);
  //Write Datas to LCD_D0 to LCD_D7
  digitalWrite(LCD_D0,d%2);
  d = d >> 1;
  digitalWrite(LCD_D1,d%2);
  d = d >> 1;
  digitalWrite(LCD_D2,d%2);
  d = d >> 1;
  digitalWrite(LCD_D3,d%2);
  d = d >> 1;
  digitalWrite(LCD_D4,d%2);
  d = d >> 1;
  digitalWrite(LCD_D5,d%2);
  d = d >> 1;
  digitalWrite(LCD_D6,d%2);
  d = d >> 1;
  digitalWrite(LCD_D7,d%2);
  d = d >> 1;
  //Enable Datas
  digitalWrite(LCD_WR,LOW);
  digitalWrite(LCD_WR,HIGH);
}

void LcdWriteData(unsigned char d){
  //Write Data Mode On
  digitalWrite(LCD_RS,HIGH);
  //Write Datas to LCD_D0 to LCD_D7
  digitalWrite(LCD_D0,d%2);
  d = d >> 1;
  digitalWrite(LCD_D1,d%2);
  d = d >> 1;
  digitalWrite(LCD_D2,d%2);
  d = d >> 1;
  digitalWrite(LCD_D3,d%2);
  d = d >> 1;
  digitalWrite(LCD_D4,d%2);
  d = d >> 1;
  digitalWrite(LCD_D5,d%2);
  d = d >> 1;
  digitalWrite(LCD_D6,d%2);
  d = d >> 1;
  digitalWrite(LCD_D7,d%2);
  d = d >> 1;
  //Enable Datas
  digitalWrite(LCD_WR,LOW);
  digitalWrite(LCD_WR,HIGH);
}

但是这样做的话,速度嘛。。。看看这个,你就不会想用digitalWrite了:

 

 单片机中,速度为王,我们还是直接改Register吧:

void LcdWriteCommand(unsigned char d){
  //Write Command Mode On
  fastDigitalWriteLOW(LCD_RS);
  //Write Datas to LCD_D0 to LCD_D7
  PORTD = (PORTD & B00000011) | ((d) & B11111100); 
  PORTB = (PORTB & B11111100) | ((d) & B00000011); 
  //Enable Datas
  fastDigitalWriteLOW(LCD_WR);
  fastDigitalWriteHIGH(LCD_WR);
}

void LcdWriteData(unsigned char d){
  //Write Command Mode On
  fastDigitalWriteHIGH(LCD_RS);
  //Write Datas to LCD_D0 to LCD_D7
  PORTD = (PORTD & B00000011) | ((d) & B11111100);
  PORTB = (PORTB & B11111100) | ((d) & B00000011);
  //Enable Datas
  fastDigitalWriteLOW(LCD_WR);
  fastDigitalWriteHIGH(LCD_WR);
}

这段代码中,我用了宏定义来实现fastDigitalWriteHIGH()和fastDigitalWriteLOW(),这两个定义能避免函数的栈调用。其实用内联函数来写也可以实现:

inline void fastDigitalWriteHIGH(int Pin){
  *(portOutputRegister(digitalPinToPort(Pin)))|=digitalPinToBitMask(Pin);
  return;
}

但我就是喜欢宏定义,而且宏定义行数少些。

另外你可能会疑惑:什么是PORTB和PORTD?

PORTB其实就是针脚8-13,PORTD其实就是针脚0-7:

 

 

 假如你有一个这样的二进制数:

00000100

把他转换成十进制:

4     

再把它赋值给PORTD

PORTD = 4;

你就会发现针脚2通电了(图中连接到左边第一个红色灯泡):

 

 

 这就是PORTD的真正意义,它使用一个从0到255的数,记录针脚0到7的通电情况。

那我们为什么不用digitalWrite(),而是要用PORTB和PORTD呢?因为快啊( ̄▽ ̄)~*

5.Enjoy!

我们刚刚实现了LcdWriteCommand()和LcdWriteData()两个函数,现在,我们就可以实现对屏幕的完全控制了!

首先,先运行一段初始化命令:

  //Initialize Data Pins
  pinMode(LCD_D0,OUTPUT);
  pinMode(LCD_D1,OUTPUT);
  pinMode(LCD_D2,OUTPUT);
  pinMode(LCD_D3,OUTPUT);
  pinMode(LCD_D4,OUTPUT);
  pinMode(LCD_D5,OUTPUT);
  pinMode(LCD_D6,OUTPUT);
  pinMode(LCD_D7,OUTPUT);

  //Initialize Command Pins
  pinMode(LCD_RD,OUTPUT);
  pinMode(LCD_WR,OUTPUT);
  pinMode(LCD_RS,OUTPUT);
  pinMode(LCD_CS,OUTPUT);
  pinMode(LCD_RST,OUTPUT);
  digitalWrite(LCD_CS,LOW);
  digitalWrite(LCD_RD,HIGH);
  digitalWrite(LCD_WR,LOW);

  //Reset
  digitalWrite(LCD_RST,HIGH);
  delay(5);
  digitalWrite(LCD_RST,LOW);
  delay(15);
  digitalWrite(LCD_RST,HIGH);
  delay(15);

  LcdWriteCommand(0xCB);
  LcdWriteData(0x39);
  LcdWriteData(0x2C);
  LcdWriteData(0x00);
  LcdWriteData(0x34);
  LcdWriteData(0x02);

  LcdWriteCommand(0xCF);
  LcdWriteData(0x00);
  LcdWriteData(0XC1);
  LcdWriteData(0X30);

  LcdWriteCommand(0xE8);
  LcdWriteData(0x85);
  LcdWriteData(0x00);
  LcdWriteData(0x78);

  LcdWriteCommand(0xEA);
  LcdWriteData(0x00);
  LcdWriteData(0x00);
 
  LcdWriteCommand(0xED);
  LcdWriteData(0x64);
  LcdWriteData(0x03);
  LcdWriteData(0X12);
  LcdWriteData(0X81);

  LcdWriteCommand(0xF7);
  LcdWriteData(0x20);
  
  LcdWriteCommand(0xC0);    //Power control 
  LcdWriteData(0x23);   //VRH[5:0] 
 
  LcdWriteCommand(0xC1);    //Power control 
  LcdWriteData(0x10);   //SAP[2:0];BT[3:0] 

  LcdWriteCommand(0xC5);    //VCM control 
  LcdWriteData(0x3e);   //Contrast
  LcdWriteData(0x28); 
 
  LcdWriteCommand(0xC7);    //VCM control2 
  LcdWriteData(0x86);   //--
 
  LcdWriteCommand(0x36);    // Memory Access Control 
  LcdWriteData(0x48);   

  LcdWriteCommand(0x3A);
  LcdWriteData(0x55);

  LcdWriteCommand(0xB1);
  LcdWriteData(0x00);
  LcdWriteData(0x18);
 
  LcdWriteCommand(0xB6);    // Display Function Control 
  LcdWriteData(0x08);
  LcdWriteData(0x82);
  LcdWriteData(0x27);

  LcdWriteCommand(0x11);    //Exit Sleep 
  delay(120);
        
  LcdWriteCommand(0x29);    //Display on 
  LcdWriteCommand(0x2c);

这么多!不要怕,原样复制过去运行就好。这段命令是按照ILITEK设计文档中的规则发送的,用于初始化屏幕。运行完这段命令之后,我们就可以开始发自己的命令了。

我们试着来清一下屏。清屏就是指定一块区域,然后给屏幕每一个像素点的颜色为白色,这样就好了。

首先定义我们要写入的区域,这里就是从(0,0)写入到(239,319):

int x1 = 0;
int x2 = 239;
int y1 = 0;
int y2 = 319;

接着通知屏幕我们要写入的区域的X坐标的起始、终止位置(命令0x2a):

LcdWriteCommand(0x2a);

然后发送X坐标的起始位置(x1),和X坐标的终止位置(x2)。我们的机器一次只能发送八位数字,但八位数字最大只能表示255,所以我们要分两次发送,先发送前八位,再发送后八位:

LcdWriteData(x1>>8);
LcdWriteData(x1);
LcdWriteData(x2>>8);
LcdWriteData(x2);

Y坐标也是一样,只是把通知命令改成0x2b:

LcdWriteCommand(0x2b);
LcdWriteData(y1>>8);
LcdWriteData(y1);
LcdWriteData(y2>>8);
LcdWriteData(y2);

接着,我们发送开始写入的命令(0x2c),告诉屏幕我要开始发送像素了:

LcdWriteCommand(0x2c);

最后,发送所有像素的颜色数据(Data)。里面的RGB()宏定义是我在上一篇文章实现的。另外,因为是数据,所以我们要使用LcdWriteData():

#define RGB(r,g,b) ((b&31)+((g&63)<<5)+((r&31)<<11))

for(int i=y1;i<=y2;i++){
  for(int j=x1;j<=x2;j++){
    LcdWriteData(RGB(31,63,31)>>8);
    LcdWriteData(RGB(31,63,31));
  }
}

保存,下载。

刷屏完整代码:

// Breakout/Arduino UNO pin usage:
// LCD Data Bit :   7   6   5   4   3   2   1   0
// Uno dig. pin :   7   6   5   4   3   2   9   8
// Uno port/pin : PD7 PD6 PD5 PD4 PD3 PD2 PB1 PB0
// Mega dig. pin:  29  28  27  26  25  24  23  22
#define LCD_D0   8
#define LCD_D1   9
#define LCD_D2   2
#define LCD_D3   3
#define LCD_D4   4
#define LCD_D5   5
#define LCD_D6   6
#define LCD_D7   7
#define LCD_RD   A0
#define LCD_WR   A1
#define LCD_RS   A2
#define LCD_CS   A3
#define LCD_RST  A4
#define fastDigitalWriteHIGH(Pin) *(portOutputRegister(digitalPinToPort(Pin)))|=digitalPinToBitMask(Pin)  //Faster digitalWrite(Pin,HIGH);
#define fastDigitalWriteLOW(Pin) *(portOutputRegister(digitalPinToPort(Pin)))&=~digitalPinToBitMask(Pin)  //Faster digitalWrite(Pin,LOW);
#define RGB(r,g,b) ((b&31)+((g&63)<<5)+((r&31)<<11))

void LcdWriteCommand(unsigned char d){
  //Write Command Mode On
  fastDigitalWriteLOW(LCD_RS);
  //Write Datas to LCD_D0 to LCD_D7
  PORTD = (PORTD & B00000011) | ((d) & B11111100); 
  PORTB = (PORTB & B11111100) | ((d) & B00000011); 
  //Enable Datas
  fastDigitalWriteLOW(LCD_WR);
  fastDigitalWriteHIGH(LCD_WR);
}

void LcdWriteData(unsigned char d){
  //Write Command Mode On
  fastDigitalWriteHIGH(LCD_RS);
  //Write Datas to LCD_D0 to LCD_D7
  PORTD = (PORTD & B00000011) | ((d) & B11111100);
  PORTB = (PORTB & B11111100) | ((d) & B00000011);
  //Enable Datas
  fastDigitalWriteLOW(LCD_WR);
  fastDigitalWriteHIGH(LCD_WR);
}

void setup(){
  //Initialize Data Pins
  pinMode(LCD_D0,OUTPUT);
  pinMode(LCD_D1,OUTPUT);
  pinMode(LCD_D2,OUTPUT);
  pinMode(LCD_D3,OUTPUT);
  pinMode(LCD_D4,OUTPUT);
  pinMode(LCD_D5,OUTPUT);
  pinMode(LCD_D6,OUTPUT);
  pinMode(LCD_D7,OUTPUT);

  //Initialize Command Pins
  pinMode(LCD_RD,OUTPUT);
  pinMode(LCD_WR,OUTPUT);
  pinMode(LCD_RS,OUTPUT);
  pinMode(LCD_CS,OUTPUT);
  pinMode(LCD_RST,OUTPUT);
  digitalWrite(LCD_CS,LOW);
  digitalWrite(LCD_RD,HIGH);
  digitalWrite(LCD_WR,LOW);

  //Reset
  digitalWrite(LCD_RST,HIGH);
  delay(5);
  digitalWrite(LCD_RST,LOW);
  delay(15);
  digitalWrite(LCD_RST,HIGH);
  delay(15);

  LcdWriteCommand(0xCB);
  LcdWriteData(0x39);
  LcdWriteData(0x2C);
  LcdWriteData(0x00);
  LcdWriteData(0x34);
  LcdWriteData(0x02);

  LcdWriteCommand(0xCF);
  LcdWriteData(0x00);
  LcdWriteData(0XC1);
  LcdWriteData(0X30);

  LcdWriteCommand(0xE8);
  LcdWriteData(0x85);
  LcdWriteData(0x00);
  LcdWriteData(0x78);

  LcdWriteCommand(0xEA);
  LcdWriteData(0x00);
  LcdWriteData(0x00);
 
  LcdWriteCommand(0xED);
  LcdWriteData(0x64);
  LcdWriteData(0x03);
  LcdWriteData(0X12);
  LcdWriteData(0X81);

  LcdWriteCommand(0xF7);
  LcdWriteData(0x20);
  
  LcdWriteCommand(0xC0);    //Power control 
  LcdWriteData(0x23);   //VRH[5:0] 
 
  LcdWriteCommand(0xC1);    //Power control 
  LcdWriteData(0x10);   //SAP[2:0];BT[3:0] 

  LcdWriteCommand(0xC5);    //VCM control 
  LcdWriteData(0x3e);   //Contrast
  LcdWriteData(0x28); 
 
  LcdWriteCommand(0xC7);    //VCM control2 
  LcdWriteData(0x86);   //--
 
  LcdWriteCommand(0x36);    // Memory Access Control 
  LcdWriteData(0x48);   

  LcdWriteCommand(0x3A);
  LcdWriteData(0x55);

  LcdWriteCommand(0xB1);
  LcdWriteData(0x00);
  LcdWriteData(0x18);
 
  LcdWriteCommand(0xB6);    // Display Function Control 
  LcdWriteData(0x08);
  LcdWriteData(0x82);
  LcdWriteData(0x27);

  LcdWriteCommand(0x11);    //Exit Sleep 
  delay(120);
        
  LcdWriteCommand(0x29);    //Display on 
  LcdWriteCommand(0x2c);

  //Set Writing Area
  int x1 = 0;
  int x2 = 239;
  int y1 = 0;
  int y2 = 319;
  LcdWriteCommand(0x2a);
  LcdWriteData(x1>>8);
  LcdWriteData(x1);
  LcdWriteData(x2>>8);
  LcdWriteData(x2);
  LcdWriteCommand(0x2b);
  LcdWriteData(y1>>8);
  LcdWriteData(y1);
  LcdWriteData(y2>>8);
  LcdWriteData(y2);

  //Start Writing
  LcdWriteCommand(0x2c);
  for(int i=y1;i<=y2;i++){
    for(int j=x1;j<=x2;j++){
      LcdWriteData(RGB(31,63,31)>>8);
      LcdWriteData(RGB(31,63,31));
    }
  }
}

void loop(){
  
}

接下来的路线就很简单了,把指定区域的命令(0x2a,0x2b,0x2c)分装成LcdOpenWindow()函数,再实现LcdFill()函数,一个完整的ILI9341驱动就完成了:

#define LCD_D0   8
#define LCD_D1   9
#define LCD_D2   2
#define LCD_D3   3
#define LCD_D4   4
#define LCD_D5   5
#define LCD_D6   6
#define LCD_D7   7
#define LCD_RD   A0
#define LCD_WR   A1
#define LCD_RS   A2
#define LCD_CS   A3
#define LCD_RST  A4
#define fastDigitalWriteHIGH(Pin) *(portOutputRegister(digitalPinToPort(Pin)))|=digitalPinToBitMask(Pin)  //Faster digitalWrite(Pin,HIGH);
#define fastDigitalWriteLOW(Pin) *(portOutputRegister(digitalPinToPort(Pin)))&=~digitalPinToBitMask(Pin)  //Faster digitalWrite(Pin,LOW);
#define RGB(r,g,b) ((b&31)+((g&63)<<5)+((r&31)<<11))

void LcdWriteCommand(unsigned char d){
  //Write Command Mode On
  fastDigitalWriteLOW(LCD_RS);
  //Write Datas to LCD_D0 to LCD_D7
  PORTD = (PORTD & B00000011) | ((d) & B11111100); 
  PORTB = (PORTB & B11111100) | ((d) & B00000011); 
  //Enable Datas
  fastDigitalWriteLOW(LCD_WR);
  fastDigitalWriteHIGH(LCD_WR);
}

void LcdWriteData(unsigned char d){
  //Write Command Mode On
  fastDigitalWriteHIGH(LCD_RS);
  //Write Datas to LCD_D0 to LCD_D7
  PORTD = (PORTD & B00000011) | ((d) & B11111100);
  PORTB = (PORTB & B11111100) | ((d) & B00000011);
  //Enable Datas
  fastDigitalWriteLOW(LCD_WR);
  fastDigitalWriteHIGH(LCD_WR);
}

void LcdInit(void){
  //Initialize Data Pins
  pinMode(LCD_D0,OUTPUT);
  pinMode(LCD_D1,OUTPUT);
  pinMode(LCD_D2,OUTPUT);
  pinMode(LCD_D3,OUTPUT);
  pinMode(LCD_D4,OUTPUT);
  pinMode(LCD_D5,OUTPUT);
  pinMode(LCD_D6,OUTPUT);
  pinMode(LCD_D7,OUTPUT);

  //Initialize Command Pins
  pinMode(LCD_RD,OUTPUT);
  pinMode(LCD_WR,OUTPUT);
  pinMode(LCD_RS,OUTPUT);
  pinMode(LCD_CS,OUTPUT);
  pinMode(LCD_RST,OUTPUT);
  digitalWrite(LCD_CS,LOW);
  digitalWrite(LCD_RD,HIGH);
  digitalWrite(LCD_WR,LOW);

  //Reset
  digitalWrite(LCD_RST,HIGH);
  delay(5);
  digitalWrite(LCD_RST,LOW);
  delay(15);
  digitalWrite(LCD_RST,HIGH);
  delay(15);

  LcdWriteCommand(0xCB);
  LcdWriteData(0x39);
  LcdWriteData(0x2C);
  LcdWriteData(0x00);
  LcdWriteData(0x34);
  LcdWriteData(0x02);

  LcdWriteCommand(0xCF);
  LcdWriteData(0x00);
  LcdWriteData(0XC1);
  LcdWriteData(0X30);

  LcdWriteCommand(0xE8);
  LcdWriteData(0x85);
  LcdWriteData(0x00);
  LcdWriteData(0x78);

  LcdWriteCommand(0xEA);
  LcdWriteData(0x00);
  LcdWriteData(0x00);
 
  LcdWriteCommand(0xED);
  LcdWriteData(0x64);
  LcdWriteData(0x03);
  LcdWriteData(0X12);
  LcdWriteData(0X81);

  LcdWriteCommand(0xF7);
  LcdWriteData(0x20);
  
  LcdWriteCommand(0xC0);    //Power control 
  LcdWriteData(0x23);   //VRH[5:0] 
 
  LcdWriteCommand(0xC1);    //Power control 
  LcdWriteData(0x10);   //SAP[2:0];BT[3:0] 

  LcdWriteCommand(0xC5);    //VCM control 
  LcdWriteData(0x3e);   //Contrast
  LcdWriteData(0x28); 
 
  LcdWriteCommand(0xC7);    //VCM control2 
  LcdWriteData(0x86);   //--
 
  LcdWriteCommand(0x36);    // Memory Access Control 
  LcdWriteData(0x48);   

  LcdWriteCommand(0x3A);
  LcdWriteData(0x55);

  LcdWriteCommand(0xB1);
  LcdWriteData(0x00);
  LcdWriteData(0x18);
 
  LcdWriteCommand(0xB6);    // Display Function Control 
  LcdWriteData(0x08);
  LcdWriteData(0x82);
  LcdWriteData(0x27);

  LcdWriteCommand(0x11);    //Exit Sleep 
  delay(120);
        
  LcdWriteCommand(0x29);    //Display on 
  LcdWriteCommand(0x2c);
}

void LcdOpenWindow(unsigned int x1,unsigned int y1,unsigned int x2,unsigned int y2){
  LcdWriteCommand(0x2a);
  LcdWriteData(x1>>8);
  LcdWriteData(x1);
  LcdWriteData(x2>>8);
  LcdWriteData(x2);
  LcdWriteCommand(0x2b);
  LcdWriteData(y1>>8);
  LcdWriteData(y1);
  LcdWriteData(y2>>8);
  LcdWriteData(y2);
  LcdWriteCommand(0x2c);
}

void LcdFill(int x,int y,int width,int height,unsigned int color)
{
  LcdOpenWindow(x,y,x+width-1,y+height-1);
  for(int i=y;i<y+height;i++){
    for(int j=x;j<x+width;j++){
      LcdWriteData(color>>8);
      LcdWriteData(color);
    }
  }
}

void setup(){
  LcdInit();
  LcdFill(0,0,239,319,RGB(31,63,31));
  LcdFill(10,10,100,100,RGB(31,0,0));
  LcdFill(20,20,110,110,RGB(0,63,0));
  LcdFill(30,30,120,120,RGB(0,0,31));
}

void loop(){
  
}

 

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