《手把手教你阅读Datasheet》写ST7735s驱动程序（SPI通信）

//LCD Init For 1.44Inch LCD Panel with ST7735.
void Lcd_Init(void)
{	
	LCD_GPIO_Init();
	Lcd_Reset(); //Reset before LCD Init.

	//LCD Init For 1.44Inch LCD Panel with ST7735.
	Lcd_WriteCmd(0x11);//Sleep exit 
	delay_ms (120);
		
	/*1.若你为了快速完成工作需求，只需要理解功能即可
	直接复制粘贴下面代码，会移植就0K.
	  2.若你有大把的空闲时间（学生），建议还是学会翻阅Datasheet
	弄清原理，打好基础，深入了解液晶屏的底层驱动
	  3.精通一种型号屏的底层驱动，万变不离其中，其他屏也信手拈来*/	
	   
	//ST7735R Frame Rate
	Lcd_WriteCmd(0xB1); 
	Lcd_WriteData(0x01); 
	Lcd_WriteData(0x2C); 
	Lcd_WriteData(0x2D); 

	Lcd_WriteCmd(0xB2); 
	Lcd_WriteData(0x01); 
	Lcd_WriteData(0x2C); 
	Lcd_WriteData(0x2D); 

	Lcd_WriteCmd(0xB3); 
	Lcd_WriteData(0x01); 
	Lcd_WriteData(0x2C); 
	Lcd_WriteData(0x2D); 
	Lcd_WriteData(0x01); 
	Lcd_WriteData(0x2C); 
	Lcd_WriteData(0x2D); 
	
	Lcd_WriteCmd(0xB4); //Column inversion 
	Lcd_WriteData(0x07); 
	
	//ST7735R Power Sequence
	Lcd_WriteCmd(0xC0); 
	Lcd_WriteData(0xA2); 
	Lcd_WriteData(0x02); 
	Lcd_WriteData(0x84); 
	Lcd_WriteCmd(0xC1); 
	Lcd_WriteData(0xC5); 

	Lcd_WriteCmd(0xC2); 
	Lcd_WriteData(0x0A); 
	Lcd_WriteData(0x00); 

	Lcd_WriteCmd(0xC3); 
	Lcd_WriteData(0x8A); 
	Lcd_WriteData(0x2A); 
	Lcd_WriteCmd(0xC4); 
	Lcd_WriteData(0x8A); 
	Lcd_WriteData(0xEE); 
	
	Lcd_WriteCmd(0xC5); //VCOM 
	Lcd_WriteData(0x0E); 
	
	Lcd_WriteCmd(0x36); //MX, MY, RGB mode 
	Lcd_WriteData(0xC0); 
	
	//ST7735R Gamma Sequence
	Lcd_WriteCmd(0xe0); 
	Lcd_WriteData(0x0f); 
	Lcd_WriteData(0x1a); 
	Lcd_WriteData(0x0f); 
	Lcd_WriteData(0x18); 
	Lcd_WriteData(0x2f); 
	Lcd_WriteData(0x28); 
	Lcd_WriteData(0x20); 
	Lcd_WriteData(0x22); 
	Lcd_WriteData(0x1f); 
	Lcd_WriteData(0x1b); 
	Lcd_WriteData(0x23); 
	Lcd_WriteData(0x37); 
	Lcd_WriteData(0x00); 	
	Lcd_WriteData(0x07); 
	Lcd_WriteData(0x02); 
	Lcd_WriteData(0x10); 

	Lcd_WriteCmd(0xe1); 
	Lcd_WriteData(0x0f); 
	Lcd_WriteData(0x1b); 
	Lcd_WriteData(0x0f); 
	Lcd_WriteData(0x17); 
	Lcd_WriteData(0x33); 
	Lcd_WriteData(0x2c); 
	Lcd_WriteData(0x29); 
	Lcd_WriteData(0x2e); 
	Lcd_WriteData(0x30); 
	Lcd_WriteData(0x30); 
	Lcd_WriteData(0x39); 
	Lcd_WriteData(0x3f); 
	Lcd_WriteData(0x00); 
	Lcd_WriteData(0x07); 
	Lcd_WriteData(0x03); 
	Lcd_WriteData(0x10);  
	
	Lcd_WriteCmd(0x2a);
	Lcd_WriteData(0x00);
	Lcd_WriteData(0x00);
	Lcd_WriteData(0x00);
	Lcd_WriteData(0x7f);

	Lcd_WriteCmd(0x2b);
	Lcd_WriteData(0x00);
	Lcd_WriteData(0x00);
	Lcd_WriteData(0x00);
	Lcd_WriteData(0x9f);
	
	Lcd_WriteCmd(0xF0); //Enable test command  
	Lcd_WriteData(0x01); 
	Lcd_WriteCmd(0xF6); //Disable ram power save mode 
	Lcd_WriteData(0x00); 
	
	Lcd_WriteCmd(0x3A); //65k mode 
	Lcd_WriteData(0x05); 
	
	
	Lcd_WriteCmd(0x29);//Display on	 
}

ST7735S------>Datasheet链接：https://pan.baidu.com/s/1tBDSJ4NsbFSTCXCxqnkzAg 提取码：uapn

建议先看看：苦练基本功《如何阅读看懂一篇Datasheet》

1.查阅Datasheet的96页COMMAND的篇章

Datasheet96页，在Instruction一栏中，看到SWRESET（Software Reset简写），再看D/CX一栏写为0，即低电平，即表示命令（而D/CX高电平表示数据），及其后面所对应的功能Software Reset,直译为“软件复位”，实际也就是“屏幕重置”的功能。数据传送有8位D7-D0，十六进制表示（Hex）为0x01。

1.很多Datasheet中（甚至计算机领域）很多命名都遵守见名知意的约定，让人一下就能猜出它的意思，可读性极高。
2.D/CX---->D表示Data数据的意思，C表示Command命令的意思
3.还有我们常说的片选信号CS------>Chip Select
4.R/W计算机术语---->读和写操作
5.还有专业Datasheet的，会在芯片引脚图（就以D/C为例）C的头上加上一撇，表示低电平有效，这让阅读Datasheet的工程师快速在图中获取信息，必要时才去看文字介绍 。正所谓–>先看目录，后看内容，先看图，后看文字

现在我写个命令

void Lcd_WriteCmd(u8 Cmd)
Lcd_WriteCmd(0x01);//表示屏幕重置

现在我们完成一个挑战，如何去读TFT屏幕的ID
OK，看到RDDID，功能介绍为Read Display ID,看到D/Cx为0，知道是–>写命令，按照D7-D0的顺序HEX为0x04.

Lcd_WriteCmd(0x04);//表示Read Display ID 读取ID

方法交给你们了，就自行探索了，不要怕英文，Datasheet专业术语都是固定的，Voltage总是万年的电压，Current总是万年的电流。Current当时我在Datasheet中认为是形容词------>”当前的“ , 被我大学老师笑话了一顿，每次看到这个单词，脑海中总是浮现那个情景，哈哈！

2.程序实战软件模拟SPI

//SCL--->主机的时钟信号
void SPI_WriteData(u8 Data)
{
    unsigned char i=0;
    for(i=8;i>0;i--)
    {
        if(Data&0x80)
            LCD_SDA_HIGH;
        else
            LCD_SDA_LOW;
        LCD_SCL_LOW;
        LCD_SCL_HIGH; //表示SCL时钟信号处于上升沿，开始一位数据传送
        Data<<=1;
    }
}

/*在上面SPI_WriteData（）函数基础上再进行封装，在CS片选信号拉低的情况下，
操作D/C----->(96页Datasheet中,高电平表示数据，低电平表示命令)
分别封装成写命令Lcd_WriteCmd(Cmd)函数和写数据Lcd_WriteData(Data)函数*/
//RS命令和数据切换，命令低电平有效，数据高电平有效

void Lcd_WriteCmd(u8 Cmd)
{
    LCD_CS_LOW;//CS片选信号低电平有效
    LCD_DC_LOW; //命令
    SPI_WriteData(Cmd);
    LCD_CS_HIGH;
    
}

void Lcd_WriteData(u8 Data)
{
    LCD_CS_LOW;
    LCD_DC_HIGH; //数据
    SPI_WriteData(Data);
    LCD_CS_HIGH;
    
}

/*在SPI_WriteData（）基础上封装成16bit处理*/
void Lcd_WriteData_16bit(u16 Data)
{
    LCD_CS_LOW;
    LCD_DC_HIGH; 
    SPI_WriteData(Data>>8);//
    SPI_WriteData(Data);
    LCD_CS_HIGH;
}

/*同时写命令和数据*/
void Lcd_WriteReg(u8 Cmd,u8 Data)
{
    Lcd_WriteCmd(Cmd);
    Lcd_WriteData(Data);
}

3.查阅Datasheet的97页COMMAND的篇章

通过对Datasheet中的command篇章的配置信息，可帮助我们对TFT液晶屏上完成我们想要的功能配置

1.Column Address Set 列地址设置（Datasheet中Instruction简写为CASET,后方Function一栏有更详细的功能介绍）
2.Row Address Set 行地址设置（Datasheet中Instruction简写为RASET）
3.Memory Write（Datasheet中Instruction简写为RAMWR）

Lcd_WriteCmd(0x2A); //列地址设置命令
Lcd_WriteCmd(0x2B); //行地址设置命令
Lcd_WriteCmd(0x2C); //Memory Write填充

/*************************************************
函数名：LCD_Set_Region
功能：设置lcd显示区域，在此区域写点数据自动换行
入口参数：xy起点和终点
返回值：无
*************************************************/
void Lcd_SetRegion(u16 x_start,u16 y_start,u16 x_end,u16 y_end)
{		
	Lcd_WriteCmd(0x2a);
	Lcd_WriteData(0x00);
	Lcd_WriteData(x_start);//Lcd_WriteData(x_start+2);
	Lcd_WriteData(0x00);
	Lcd_WriteData(x_end+2);

	Lcd_WriteCmd(0x2b);
	Lcd_WriteData(0x00);
	Lcd_WriteData(y_start+0);
	Lcd_WriteData(0x00);
	Lcd_WriteData(y_end+1);
	
	Lcd_WriteCmd(0x2c);
}