[STM32H5 development board] 3. Use the SPI interface to drive the ST7789 LCD display
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This post was last edited by Da Tu Tu on 2023-7-3 00:41
Based on the development environment built earlier, this time we started to develop peripheral applications for the STMH563 development board. First of all, in order to display content in subsequent experiments, this experiment first developed the LCD display driver.
Here we use a 1.14-inch serial display screen with ST7789 chip, which uses the SPI interface for communication.
1. Check the interface of ST7789 LCD display
Its resolution is 135 x 240, and it needs to connect several signal lines including SCL, SDA, RES, DC, CS, as well as power supply and backlight.
2. SPI interface of STMH563
The electrical characteristics of the STMH563 SPI interface are shown in the figure below:
When the STMH563 interface is connected to the LCD, it is set to the master mode, and the timing is as follows:
3. STMH563 connected to ST7789 Hardware connection
From the information, we know that STMH563 has 3 groups of SPI interfaces. Here we choose SP1 interface and use the following pins to connect LCD
LCD module STMH563 MCU
BLK connects to PB2 // LCD backlight control signal. If control is not required, connect to 3.3V, or control on and off through IO
SCK connects to PB3 // LCD SPI bus clock signal
SDA connects to PB4 // LCD data/command control signal
RES connects to PB9 // LCD reset control signal
CS connects to PB10 // LCD chip select control signal
The development board connection line is as follows:
4. Software driver transplantation development
The ST 7789 serial port screen provides a driver example program for STM32F103, so here we mainly transplant it to H563. The original code mainly drives as follows:
#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++)
{
SPI_WriteByte(SPI2,Color>>8);
SPI_WriteByte(SPI2,Color);
}
}
LCD_CS_SET;
}
/*****************************************************************************
* @name :void LCD_GPIOInit(void)
* @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_12|GPIO_Pin_11; //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
GPIO_SetBits(GPIOB,GPIO_Pin_9|GPIO_Pin_10|GPIO_Pin_12|GPIO_Pin_11);
}
/*****************************************************************************
* @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(20);
LCD_RST_SET;
delay_ms(20);
}
/*****************************************************************************
* @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
//************* ST7789V初始化**********//
delay_ms(120); //ms
LCD_WR_REG(0x11); //Sleep out
delay_ms(120); //Delay 120ms
LCD_WR_REG(0x36);
LCD_WR_DATA(0x00);
LCD_WR_REG(0x3A);
LCD_WR_DATA(0x05); //0x05( 65K Color)
LCD_WR_REG(0x21);
LCD_WR_REG(0xB2);
LCD_WR_DATA(0x05);
LCD_WR_DATA(0x05);
LCD_WR_DATA(0x00);
LCD_WR_DATA(0x33);
LCD_WR_DATA(0x33);
LCD_WR_REG(0xB7);
LCD_WR_DATA(0x23);
LCD_WR_REG(0xBB);
LCD_WR_DATA(0x22);
LCD_WR_REG(0xC0);
LCD_WR_DATA(0x2C);
LCD_WR_REG(0xC2);
LCD_WR_DATA(0x01);
LCD_WR_REG(0xC3);
LCD_WR_DATA(0x13);
LCD_WR_REG(0xC4);
LCD_WR_DATA(0x20);
LCD_WR_REG(0xC6);
LCD_WR_DATA(0x0F);
LCD_WR_REG(0xD0);
LCD_WR_DATA(0xA4);
LCD_WR_DATA(0xA1);
LCD_WR_REG(0xD6);
LCD_WR_DATA(0xA1);
LCD_WR_REG(0xE0);
LCD_WR_DATA(0x70);
LCD_WR_DATA(0x06);
LCD_WR_DATA(0x0C);
LCD_WR_DATA(0x08);
LCD_WR_DATA(0x09);
LCD_WR_DATA(0x27);
LCD_WR_DATA(0x2E);
LCD_WR_DATA(0x34);
LCD_WR_DATA(0x46);
LCD_WR_DATA(0x37);
LCD_WR_DATA(0x13);
LCD_WR_DATA(0x13);
LCD_WR_DATA(0x25);
LCD_WR_DATA(0x2A);
LCD_WR_REG(0xE1);
LCD_WR_DATA(0x70);
LCD_WR_DATA(0x04);
LCD_WR_DATA(0x08);
LCD_WR_DATA(0x09);
LCD_WR_DATA(0x07);
LCD_WR_DATA(0x03);
LCD_WR_DATA(0x2C);
LCD_WR_DATA(0x42);
LCD_WR_DATA(0x42);
LCD_WR_DATA(0x38);
LCD_WR_DATA(0x14);
LCD_WR_DATA(0x14);
LCD_WR_DATA(0x27);
LCD_WR_DATA(0x2C);
LCD_WR_REG(0x29); //Display on
// LCD_WR_REG(0x2A); //Column Address Set
// LCD_WR_DATA(0x00);
// LCD_WR_DATA(0x34); //52
// LCD_WR_DATA(0x00);
// LCD_WR_DATA(0xBA); //186
// LCD_WR_REG(0x2B); //Row Address Set
// LCD_WR_DATA(0x00);
// LCD_WR_DATA(0x28); //40
// LCD_WR_DATA(0x01);
// LCD_WR_DATA(0x17); //279
// LCD_WR_REG(0x2C);
// LCD_WR_REG(0x11); //Sleep out
// delay_ms(120); //Delay 120ms
// LCD_WR_REG(0x10); //Sleep in
// delay_ms(120); //Delay 120ms
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+lcddev.xoffset)>>8);
LCD_WR_DATA(xStar+lcddev.xoffset);
LCD_WR_DATA((xEnd+lcddev.xoffset)>>8);
LCD_WR_DATA(xEnd+lcddev.xoffset);
LCD_WR_REG(lcddev.setycmd);
LCD_WR_DATA((yStar+lcddev.yoffset)>>8);
LCD_WR_DATA(yStar+lcddev.yoffset);
LCD_WR_DATA((yEnd+lcddev.yoffset)>>8);
LCD_WR_DATA(yEnd+lcddev.yoffset);
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;
lcddev.xoffset=52;
lcddev.yoffset=40;
LCD_WriteReg(0x36,0);//BGR==1,MY==0,MX==0,MV==0
break;
case 1:
lcddev.width=LCD_H;
lcddev.height=LCD_W;
lcddev.xoffset=40;
lcddev.yoffset=53;
LCD_WriteReg(0x36,(1<<6)|(1<<5));//BGR==1,MY==1,MX==0,MV==1
break;
case 2:
lcddev.width=LCD_W;
lcddev.height=LCD_H;
lcddev.xoffset=53;
lcddev.yoffset=40;
LCD_WriteReg(0x36,(1<<6)|(1<<7));//BGR==1,MY==0,MX==0,MV==0
break;
case 3:
lcddev.width=LCD_H;
lcddev.height=LCD_W;
lcddev.xoffset=40;
lcddev.yoffset=52;
LCD_WriteReg(0x36,(1<<7)|(1<<5));//BGR==1,MY==1,MX==0,MV==1
break;
default:break;
}
}
Code transplantation development, the main modification is to put this code under the H563 SDK, modify the SPI call and related system initialization,
It should be noted that this LCD has an initial x, y starting data, and the calculation method is x=(240-w)/2, y=(320-h)/2, so x=0, y= 92, so that the content can be displayed correctly, otherwise a distorted screen will appear.
The code projects under development and modification are as follows:
5. Compile and run
After modification, debugging and burning, ST7789 was finally successfully transplanted to H653.
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