[Fudan Micro FM33LG0 Series Development Board Review] Driving SPI TFT Display
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I saw an LCD SPI screen for 9.9 yuan on Taobao and bought it. I found out that it was controlled by ST7735 chip. Generally, most of the ones sold on Taobao are 12864 or driven by ILI93XX, and there are relatively few using ST7735, so I want to write a blog post about ST7735. Before driving the screen, we need to look at its product manual. ST7735 has two driving modes, one is SPI communication and the other is bus driving. Since the LCD screen I bought is SPI communication, I will only discuss SPI driving. There are two SPI communication timing diagrams in the manual, one is SPI three-wire and the other is SPI four-wire. In fact, they are essentially the same, except that the three-wire SPI lacks a data command switching control compared to the four-wire SPI.
SPI7735SPI three-wire timing diagram
ST7735SPI four-wire timing diagram:
Make the driver. Port it in an afternoon. Done.
Driver function:
#include "lcd_init.h"
//#include "delay.h"
void LCD_GPIO_Init(void)
{
// GPIO_InitTypeDef GPIO_InitStructure;
// RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //使能A端口时钟
// GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5;
// GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //推挽输出
// GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;//速度50MHz
// GPIO_Init(GPIOA, &GPIO_InitStructure); //初始化GPIOA
// GPIO_SetBits(GPIOA,GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5);
FL_GPIO_InitTypeDef GPIO_InitStruct = {0};
FL_GPIO_ResetOutputPin(GPIOA, FL_GPIO_PIN_0|FL_GPIO_PIN_1|FL_GPIO_PIN_2|FL_GPIO_PIN_3|FL_GPIO_PIN_4|FL_GPIO_PIN_5);
GPIO_InitStruct.pin = FL_GPIO_PIN_0|FL_GPIO_PIN_1|FL_GPIO_PIN_2|FL_GPIO_PIN_3|FL_GPIO_PIN_4|FL_GPIO_PIN_5;
GPIO_InitStruct.mode = FL_GPIO_MODE_OUTPUT;
GPIO_InitStruct.outputType = FL_GPIO_OUTPUT_PUSHPULL;
GPIO_InitStruct.pull = FL_DISABLE;
FL_GPIO_Init(GPIOA, &GPIO_InitStruct);
}
/******************************************************************************
函数说明：LCD串行数据写入函数
入口数据：dat 要写入的串行数据
返回值： 无
******************************************************************************/
void LCD_Writ_Bus(unsigned char dat)
{
unsigned char i;
LCD_CS_Clr();
for(i=0;i<8;i++)
{
LCD_SCLK_Clr();
if(dat&0x80)
{
LCD_MOSI_Set();
}
else
{
LCD_MOSI_Clr();
}
LCD_SCLK_Set();
dat<<=1;
}
LCD_CS_Set();
}
/******************************************************************************
函数说明：LCD写入数据
入口数据：dat 写入的数据
返回值： 无
******************************************************************************/
void LCD_WR_DATA8(unsigned char dat)
{
LCD_Writ_Bus(dat);
}
/******************************************************************************
函数说明：LCD写入数据
入口数据：dat 写入的数据
返回值： 无
******************************************************************************/
void LCD_WR_DATA(unsigned short dat)
{
LCD_Writ_Bus(dat>>8);
LCD_Writ_Bus(dat);
}
/******************************************************************************
函数说明：LCD写入命令
入口数据：dat 写入的命令
返回值： 无
******************************************************************************/
void LCD_WR_REG(unsigned char dat)
{
LCD_DC_Clr();//写命令
LCD_Writ_Bus(dat);
LCD_DC_Set();//写数据
}
/******************************************************************************
函数说明：设置起始和结束地址
入口数据：x1,x2 设置列的起始和结束地址
y1,y2 设置行的起始和结束地址
返回值： 无
******************************************************************************/
void LCD_Address_Set(unsigned short x1,unsigned short y1,unsigned short x2,unsigned short y2)
{
if(USE_HORIZONTAL==0)
{
LCD_WR_REG(0x2a);//列地址设置
LCD_WR_DATA(x1+2);
LCD_WR_DATA(x2+2);
LCD_WR_REG(0x2b);//行地址设置
LCD_WR_DATA(y1+1);
LCD_WR_DATA(y2+1);
LCD_WR_REG(0x2c);//储存器写
}
else if(USE_HORIZONTAL==1)
{
LCD_WR_REG(0x2a);//列地址设置
LCD_WR_DATA(x1+2);
LCD_WR_DATA(x2+2);
LCD_WR_REG(0x2b);//行地址设置
LCD_WR_DATA(y1+1);
LCD_WR_DATA(y2+1);
LCD_WR_REG(0x2c);//储存器写
}
else if(USE_HORIZONTAL==2)
{
LCD_WR_REG(0x2a);//列地址设置
LCD_WR_DATA(x1+1);
LCD_WR_DATA(x2+1);
LCD_WR_REG(0x2b);//行地址设置
LCD_WR_DATA(y1+2);
LCD_WR_DATA(y2+2);
LCD_WR_REG(0x2c);//储存器写
}
else
{
LCD_WR_REG(0x2a);//列地址设置
LCD_WR_DATA(x1+1);
LCD_WR_DATA(x2+1);
LCD_WR_REG(0x2b);//行地址设置
LCD_WR_DATA(y1+2);
LCD_WR_DATA(y2+2);
LCD_WR_REG(0x2c);//储存器写
}
}
void LCD_Init(void)
{
LCD_GPIO_Init();//初始化GPIO
LCD_RES_Clr();//复位
FL_DelayMs(100);
LCD_RES_Set();
FL_DelayMs(100);
LCD_BLK_Set();//打开背光
FL_DelayMs(100);
//************* Start Initial Sequence **********//
LCD_WR_REG(0x11); //Sleep out
FL_DelayMs(120); //Delay 120ms
//------------------------------------ST7735S Frame Rate-----------------------------------------//
LCD_WR_REG(0xB1);
LCD_WR_DATA8(0x05);
LCD_WR_DATA8(0x3C);
LCD_WR_DATA8(0x3C);
LCD_WR_REG(0xB2);
LCD_WR_DATA8(0x05);
LCD_WR_DATA8(0x3C);
LCD_WR_DATA8(0x3C);
LCD_WR_REG(0xB3);
LCD_WR_DATA8(0x05);
LCD_WR_DATA8(0x3C);
LCD_WR_DATA8(0x3C);
LCD_WR_DATA8(0x05);
LCD_WR_DATA8(0x3C);
LCD_WR_DATA8(0x3C);
//------------------------------------End ST7735S Frame Rate---------------------------------//
LCD_WR_REG(0xB4); //Dot inversion
LCD_WR_DATA8(0x03);
//------------------------------------ST7735S Power Sequence---------------------------------//
LCD_WR_REG(0xC0);
LCD_WR_DATA8(0x28);
LCD_WR_DATA8(0x08);
LCD_WR_DATA8(0x04);
LCD_WR_REG(0xC1);
LCD_WR_DATA8(0XC0);
LCD_WR_REG(0xC2);
LCD_WR_DATA8(0x0D);
LCD_WR_DATA8(0x00);
LCD_WR_REG(0xC3);
LCD_WR_DATA8(0x8D);
LCD_WR_DATA8(0x2A);
LCD_WR_REG(0xC4);
LCD_WR_DATA8(0x8D);
LCD_WR_DATA8(0xEE);
//---------------------------------End ST7735S Power Sequence-------------------------------------//
LCD_WR_REG(0xC5); //VCOM
LCD_WR_DATA8(0x1A);
LCD_WR_REG(0x36); //MX, MY, RGB mode
if(USE_HORIZONTAL==0)LCD_WR_DATA8(0x00);
else if(USE_HORIZONTAL==1)LCD_WR_DATA8(0xC0);
else if(USE_HORIZONTAL==2)LCD_WR_DATA8(0x70);
else LCD_WR_DATA8(0xA0);
//------------------------------------ST7735S Gamma Sequence---------------------------------//
LCD_WR_REG(0xE0);
LCD_WR_DATA8(0x04);
LCD_WR_DATA8(0x22);
LCD_WR_DATA8(0x07);
LCD_WR_DATA8(0x0A);
LCD_WR_DATA8(0x2E);
LCD_WR_DATA8(0x30);
LCD_WR_DATA8(0x25);
LCD_WR_DATA8(0x2A);
LCD_WR_DATA8(0x28);
LCD_WR_DATA8(0x26);
LCD_WR_DATA8(0x2E);
LCD_WR_DATA8(0x3A);
LCD_WR_DATA8(0x00);
LCD_WR_DATA8(0x01);
LCD_WR_DATA8(0x03);
LCD_WR_DATA8(0x13);
LCD_WR_REG(0xE1);
LCD_WR_DATA8(0x04);
LCD_WR_DATA8(0x16);
LCD_WR_DATA8(0x06);
LCD_WR_DATA8(0x0D);
LCD_WR_DATA8(0x2D);
LCD_WR_DATA8(0x26);
LCD_WR_DATA8(0x23);
LCD_WR_DATA8(0x27);
LCD_WR_DATA8(0x27);
LCD_WR_DATA8(0x25);
LCD_WR_DATA8(0x2D);
LCD_WR_DATA8(0x3B);
LCD_WR_DATA8(0x00);
LCD_WR_DATA8(0x01);
LCD_WR_DATA8(0x04);
LCD_WR_DATA8(0x13);
//------------------------------------End ST7735S Gamma Sequence-----------------------------//
LCD_WR_REG(0x3A); //65k mode
LCD_WR_DATA8(0x05);
LCD_WR_REG(0x29); //Display on
}
main
#include "main.h"
#include "user_init.h"
#include "lcd_init.h"
#include "lcd.h"
int main(void)
{
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
/* SHOULD BE KEPT!!! */
MF_Clock_Init();
/* Configure the system clock */
/* SHOULD BE KEPT!!! */
MF_SystemClock_Config();
/* Initialize FL Driver Library */
/* SHOULD BE KEPT!!! */
FL_Init();
/* Initialize all configured peripherals */
/* SHOULD BE KEPT!!! */
MF_Config_Init();
UserInit();
LCD_Init();//LCD初始化
LCD_Fill(0,0,LCD_W,LCD_H,BLUE);
FL_DelayMs(100);
LCD_ShowString(18,30,"Fudan",WHITE,BLUE,32,0);
LCD_ShowString(5,90,"FM33LG0",WHITE,BLUE,32,0);
FL_DelayMs(10);
while(1)
{
LED0_TOG();
// printf("祝福复旦微电子越办越好!\r\n");
FL_DelayMs(1000);
}
}
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