STM32驱动4寸ST7796S LCD-TFT屏

• • 简介
  • 屏幕与STM32F103RCT6开发板接线
  • 屏幕原理图
  • STM32驱动程序
  • 屏幕显示效果

简介

屏幕驱动芯片ST7796S最大支持320*480分辨率的屏幕，显存GRAM达345600字节，支持8/9/16/18/24位并口数据总线，还支持3/4线制SPI通信。每一个像素点RGB显示的颜色可达65K/262K/16.7M钟，像素点地址设置按照行列的顺序进行，递增递减方向由扫描方式决定，显示方法按照先设置地址再设置颜色。
4寸LCD屏幕参数

项目	描述
显示颜色	RGB 65K彩色
分辨率	480*320（Pixel）
通信接口	4线SPI
触摸IC类型	电阻触摸XPT2046
工作温度	-10℃~60℃

屏幕与STM32F103RCT6开发板接线

屏幕引脚	引脚说明	STM32引脚
VCC	电源正（3.3-5V）	5V/3.3V
GND	电源地	GND
CS	片选（低有效）	PB11
RESET	复位（低有效）	PB12
DC/RS	命令/数据选择（高电平：数据，低：命令）	PB10
SDI(MOSI)	SPI总线写数据信号	PB15
SCK	SPI总线时钟信号	PB13
LED	背光控制（高点亮，如不需控制，则接3.3V）	PB9
SDO(MISO)	SPI总线读数据信号	PB14
T_CLK	触摸SPI总线时钟信号	PC0
T_CS	触摸片选（低有效）	PC13
T_DIN	触摸SPI总线输入信号	PC3
T_DO	触摸SPI总线输出信号	PC2
T_IRQ	触摸中断信号	PC10

屏幕原理图

STM32驱动程序

主程序代码

#include "delay.h"
#include "sys.h"
#include "lcd.h"
#include "touch.h"
#include "gui.h"
#include "test.h"

int main(void)
{	
	SystemInit();//初始化RCC 设置系统主频为72MHZ
	delay_init(72);	     //延时初始化
	LCD_Init();	   //液晶屏初始化
  //循环测试
	while(1)
	{
		main_test(); 		//测试主界面
		Test_Color();  		//简单刷屏填充测试
		Test_FillRec();		//GUI矩形绘图测试
		Test_Circle(); 		//GUI画圆测试
		Test_Triangle();    //GUI三角形绘图测试
		English_Font_test();//英文字体示例测试
		Chinese_Font_test();//中文字体示例测试
		Pic_test();			//图片显示示例测试
		Rotate_Test();   //旋转显示测试
		//如果不带触摸，或者不需要触摸功能，请注释掉下面触摸屏测试项
		Touch_Test();		//触摸屏手写测试  
	}
}

STM32硬件SPI驱动代码

#include "spi.h"

/*****************************************************************************
 * @name       :u8 SPI_WriteByte(SPI_TypeDef* SPIx,u8 Byte)
 * @date       :2018-08-09 
 * @function   :Write a byte of data using STM32's hardware SPI
 * @parameters :SPIx: SPI type,x for 1,2,3
                Byte:Data to be written
 * @retvalue   :Data received by the bus
******************************************************************************/
u8 SPI_WriteByte(SPI_TypeDef* SPIx,u8 Byte)
{
	while((SPIx->SR&SPI_I2S_FLAG_TXE)==RESET);		//等待发送区空	  
	SPIx->DR=Byte;	 	//发送一个byte   
	while((SPIx->SR&SPI_I2S_FLAG_RXNE)==RESET);//等待接收完一个byte  
	return SPIx->DR;          	     //返回收到的数据			
} 

/*****************************************************************************
 * @name       :void SPI_SetSpeed(SPI_TypeDef* SPIx,u8 SpeedSet)
 * @date       :2018-08-09 
 * @function   :Set hardware SPI Speed
 * @parameters :SPIx: SPI type,x for 1,2,3
                SpeedSet:0-high speed
												 1-low speed
 * @retvalue   :None
******************************************************************************/
void SPI_SetSpeed(SPI_TypeDef* SPIx,u8 SpeedSet)
{
	SPIx->CR1&=0XFFC7;
	if(SpeedSet==1)//高速
	{
		SPIx->CR1|=SPI_BaudRatePrescaler_2;//Fsck=Fpclk/2	
	}
	else//低速
	{
		SPIx->CR1|=SPI_BaudRatePrescaler_32; //Fsck=Fpclk/32
	}
	SPIx->CR1|=1<<6; //SPI设备使能
} 

/*****************************************************************************
 * @name       :void SPI2_Init(void)	
 * @date       :2018-08-09 
 * @function   :Initialize the STM32 hardware SPI2
 * @parameters :None
 * @retvalue   :None
******************************************************************************/
void SPI2_Init(void)	
{
	SPI_InitTypeDef  SPI_InitStructure;
	GPIO_InitTypeDef GPIO_InitStructure;
	 
	//配置SPI2管脚
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO|RCC_APB2Periph_GPIOB, ENABLE);
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_15;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
	GPIO_Init(GPIOB, &GPIO_InitStructure);

	GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_14;    
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; 
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;  
	GPIO_Init(GPIOB, &GPIO_InitStructure);  
	
	//SPI2配置选项
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2 ,ENABLE);
	   
	SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
	SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
	SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
	SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
	SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
	SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
	SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;
	SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
	SPI_InitStructure.SPI_CRCPolynomial = 7;
	SPI_Init(SPI2, &SPI_InitStructure);

	//使能SPI2
	SPI_Cmd(SPI2, ENABLE);   
}

LCD底层驱动代码

#include "lcd.h"
#include "stdlib.h"
#include "delay.h"	 
#include "SPI.h"
	   
//管理LCD重要参数
//默认为竖屏
_lcd_dev lcddev;

//画笔颜色,背景颜色
u16 POINT_COLOR = 0x0000,BACK_COLOR = 0xFFFF;  
u16 DeviceCode;	 

/*****************************************************************************
 * @name       :void LCD_WR_REG(u8 data)
 * @date       :2018-08-09 
 * @function   :Write an 8-bit command to the LCD screen
 * @parameters :data:Command value to be written
 * @retvalue   :None
******************************************************************************/
void LCD_WR_REG(u8 data)
{ 
   LCD_CS_CLR;     
	 LCD_RS_CLR;	  
   SPI_WriteByte(SPI2,data);
   LCD_CS_SET;	
}

/*****************************************************************************
 * @name       :void LCD_WR_DATA(u8 data)
 * @date       :2018-08-09 
 * @function   :Write an 8-bit data to the LCD screen
 * @parameters :data:data value to be written
 * @retvalue   :None
******************************************************************************/
void LCD_WR_DATA(u8 data)
{
   LCD_CS_CLR;
	 LCD_RS_SET;
   SPI_WriteByte(SPI2,data);
   LCD_CS_SET;
}

/*****************************************************************************
 * @name       :void LCD_WriteReg(u8 LCD_Reg, u16 LCD_RegValue)
 * @date       :2018-08-09 
 * @function   :Write data into registers
 * @parameters :LCD_Reg:Register address
                LCD_RegValue:Data to be written
 * @retvalue   :None
******************************************************************************/
void LCD_WriteReg(u8 LCD_Reg, u16 LCD_RegValue)
{	
	LCD_WR_REG(LCD_Reg);  
	LCD_WR_DATA(LCD_RegValue);	    		 
}	   

/*****************************************************************************
 * @name       :void LCD_WriteRAM_Prepare(void)
 * @date       :2018-08-09 
 * @function   :Write GRAM
 * @parameters :None
 * @retvalue   :None
******************************************************************************/	 
void LCD_WriteRAM_Prepare(void)
{
	LCD_WR_REG(lcddev.wramcmd);
}	 

/*****************************************************************************
 * @name       :void Lcd_WriteData_16Bit(u16 Data)
 * @date       :2018-08-09 
 * @function   :Write an 16-bit command to the LCD screen
 * @parameters :Data:Data to be written
 * @retvalue   :None
******************************************************************************/	 
void Lcd_WriteData_16Bit(u16 Data)
{	
	 LCD_CS_CLR;
	 LCD_RS_SET;
   SPI_WriteByte(SPI2,Data>>8);
   SPI_WriteByte(SPI2,Data);
	 LCD_CS_SET;
}

/*****************************************************************************
 * @name       :void LCD_DrawPoint(u16 x,u16 y)
 * @date       :2018-08-09 
 * @function   :Write a pixel data at a specified location
 * @parameters :x:the x coordinate of the pixel
                y:the y coordinate of the pixel
 * @retvalue   :None
******************************************************************************/	
void LCD_DrawPoint(u16 x,u16 y)
{
	LCD_SetCursor(x,y);//设置光标位置 
	Lcd_WriteData_16Bit(POINT_COLOR); 
}

/*****************************************************************************
 * @name       :void LCD_Clear(u16 Color)
 * @date       :2018-08-09 
 * @function   :Full screen filled LCD screen
 * @parameters :color:Filled color
 * @retvalue   :None
******************************************************************************/	
void LCD_Clear(u16 Color)
{
  unsigned int i,m;  
	LCD_SetWindows(0,0,lcddev.width-1,lcddev.height-1);   
	LCD_CS_CLR;
	LCD_RS_SET;
	for(i=0;i<lcddev.height;i++)
	{
    for(m=0;m<lcddev.width;m++)
    {	
			Lcd_WriteData_16Bit(Color);
		}
	}
	 LCD_CS_SET;
} 

/*****************************************************************************
 * @name       :void LCD_Clear(u16 Color)
 * @date       :2018-08-09 
 * @function   :Initialization LCD screen GPIO
 * @parameters :None
 * @retvalue   :None
******************************************************************************/	
void LCD_GPIOInit(void)
{
	GPIO_InitTypeDef  GPIO_InitStructure;	      
	RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOB ,ENABLE);	//使能GPIOB时钟
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9| GPIO_Pin_10| GPIO_Pin_11| GPIO_Pin_12; //GPIOB9,10,11,12
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;   //推挽输出
	GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化
}

/*****************************************************************************
 * @name       :void LCD_RESET(void)
 * @date       :2018-08-09 
 * @function   :Reset LCD screen
 * @parameters :None
 * @retvalue   :None
******************************************************************************/	
void LCD_RESET(void)
{
	LCD_RST_CLR;
	delay_ms(100);	
	LCD_RST_SET;
	delay_ms(50);
}

/*****************************************************************************
 * @name       :void LCD_RESET(void)
 * @date       :2018-08-09 
 * @function   :Initialization LCD screen
 * @parameters :None
 * @retvalue   :None
******************************************************************************/	 	 
void LCD_Init(void)
{  
	SPI2_Init(); //硬件SPI2初始化
	LCD_GPIOInit();//LCD GPIO初始化										 
 	LCD_RESET(); //LCD 复位
//************* ST7796S初始化**********//	
	LCD_WR_REG(0xF0);
	LCD_WR_DATA(0xC3);
	LCD_WR_REG(0xF0);
	LCD_WR_DATA(0x96);
	LCD_WR_REG(0x36);
	LCD_WR_DATA(0x68);	
	LCD_WR_REG(0x3A);
	LCD_WR_DATA(0x05);	
	LCD_WR_REG(0xB0);
	LCD_WR_DATA(0x80);	
	LCD_WR_REG(0xB6);
	LCD_WR_DATA(0x00);
	LCD_WR_DATA(0x02);	
	LCD_WR_REG(0xB5);
	LCD_WR_DATA(0x02);
	LCD_WR_DATA(0x03);
	LCD_WR_DATA(0x00);
	LCD_WR_DATA(0x04);
	LCD_WR_REG(0xB1);
	LCD_WR_DATA(0x80);	
	LCD_WR_DATA(0x10);	
	LCD_WR_REG(0xB4);
	LCD_WR_DATA(0x00);
	LCD_WR_REG(0xB7);
	LCD_WR_DATA(0xC6);
	LCD_WR_REG(0xC5);
	LCD_WR_DATA(0x24);
	LCD_WR_REG(0xE4);
	LCD_WR_DATA(0x31);
	LCD_WR_REG(0xE8);
	LCD_WR_DATA(0x40);
	LCD_WR_DATA(0x8A);
	LCD_WR_DATA(0x00);
	LCD_WR_DATA(0x00);
	LCD_WR_DATA(0x29);
	LCD_WR_DATA(0x19);
	LCD_WR_DATA(0xA5);
	LCD_WR_DATA(0x33);
	LCD_WR_REG(0xC2);
	LCD_WR_REG(0xA7);
	
	LCD_WR_REG(0xE0);
	LCD_WR_DATA(0xF0);
	LCD_WR_DATA(0x09);
	LCD_WR_DATA(0x13);
	LCD_WR_DATA(0x12);
	LCD_WR_DATA(0x12);
	LCD_WR_DATA(0x2B);
	LCD_WR_DATA(0x3C);
	LCD_WR_DATA(0x44);
	LCD_WR_DATA(0x4B);
	LCD_WR_DATA(0x1B);
	LCD_WR_DATA(0x18);
	LCD_WR_DATA(0x17);
	LCD_WR_DATA(0x1D);
	LCD_WR_DATA(0x21);

	LCD_WR_REG(0XE1);
	LCD_WR_DATA(0xF0);
	LCD_WR_DATA(0x09);
	LCD_WR_DATA(0x13);
	LCD_WR_DATA(0x0C);
	LCD_WR_DATA(0x0D);
	LCD_WR_DATA(0x27);
	LCD_WR_DATA(0x3B);
	LCD_WR_DATA(0x44);
	LCD_WR_DATA(0x4D);
	LCD_WR_DATA(0x0B);
	LCD_WR_DATA(0x17);
	LCD_WR_DATA(0x17);
	LCD_WR_DATA(0x1D);
	LCD_WR_DATA(0x21);

  LCD_WR_REG(0X36);
	LCD_WR_DATA(0xEC);
	LCD_WR_REG(0xF0);
	LCD_WR_DATA(0xC3);
	LCD_WR_REG(0xF0);
	LCD_WR_DATA(0x69);
	LCD_WR_REG(0X13);
	LCD_WR_REG(0X11);
	LCD_WR_REG(0X29);
	
  LCD_direction(USE_HORIZONTAL);//设置LCD显示方向
	LCD_LED=1;//点亮背光	 
	LCD_Clear(WHITE);//清全屏白色
}
 
/*****************************************************************************
 * @name       :void LCD_SetWindows(u16 xStar, u16 yStar,u16 xEnd,u16 yEnd)
 * @date       :2018-08-09 
 * @function   :Setting LCD display window
 * @parameters :xStar:the bebinning x coordinate of the LCD display window
								yStar:the bebinning y coordinate of the LCD display window
								xEnd:the endning x coordinate of the LCD display window
								yEnd:the endning y coordinate of the LCD display window
 * @retvalue   :None
******************************************************************************/ 
void LCD_SetWindows(u16 xStar, u16 yStar,u16 xEnd,u16 yEnd)
{	
	LCD_WR_REG(lcddev.setxcmd);	
	LCD_WR_DATA(xStar>>8);
	LCD_WR_DATA(0x00FF&xStar);		
	LCD_WR_DATA(xEnd>>8);
	LCD_WR_DATA(0x00FF&xEnd);

	LCD_WR_REG(lcddev.setycmd);	
	LCD_WR_DATA(yStar>>8);
	LCD_WR_DATA(0x00FF&yStar);		
	LCD_WR_DATA(yEnd>>8);
	LCD_WR_DATA(0x00FF&yEnd);

	LCD_WriteRAM_Prepare();	//开始写入GRAM			
}   

/*****************************************************************************
 * @name       :void LCD_SetCursor(u16 Xpos, u16 Ypos)
 * @date       :2018-08-09 
 * @function   :Set coordinate value
 * @parameters :Xpos:the  x coordinate of the pixel
								Ypos:the  y coordinate of the pixel
 * @retvalue   :None
******************************************************************************/ 
void LCD_SetCursor(u16 Xpos, u16 Ypos)
{	  	    			
	LCD_SetWindows(Xpos,Ypos,Xpos,Ypos);	
} 

/*****************************************************************************
 * @name       :void LCD_direction(u8 direction)
 * @date       :2018-08-09 
 * @function   :Setting the display direction of LCD screen
 * @parameters :direction:0-0 degree
                          1-90 degree
													2-180 degree
													3-270 degree
 * @retvalue   :None
******************************************************************************/ 
void LCD_direction(u8 direction)
{ 
	lcddev.setxcmd=0x2A;
	lcddev.setycmd=0x2B;
	lcddev.wramcmd=0x2C;
	switch(direction){		  
		case 0:						 	 		
			lcddev.width=LCD_W;
			lcddev.height=LCD_H;		
			LCD_WriteReg(0x36,(1<<3)|(1<<6));
		break;
		case 1:
			lcddev.width=LCD_H;
			lcddev.height=LCD_W;
			LCD_WriteReg(0x36,(1<<3)|(1<<5));
		break;
		case 2:						 	 		
			lcddev.width=LCD_W;
			lcddev.height=LCD_H;	
			LCD_WriteReg(0x36,(1<<3)|(1<<7));
		break;
		case 3:
			lcddev.width=LCD_H;
			lcddev.height=LCD_W;
			LCD_WriteReg(0x36,(1<<3)|(1<<7)|(1<<6)|(1<<5));
		break;	
		default:break;
	}		
}

屏幕显示效果