代码
液晶屏型号:ILI9488
液晶屏操作直接由原厂代码更改了一下得来。
#include <stdio.h>
#include <linux/ioctl.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <fcntl.h>
#include <unistd.h>
#include "main.h"
int fd_spi; //spi
int fd_cs; //cd
int fd_rs; //数据/指令切换
int fd_re; //复位
_lcd_dev lcddev;
void LCD_WR_REG(unsigned char Reg)
{
char data[] = {
Reg
};
write(fd_rs,"0",1);
write(fd_cs,"0",1);
write(fd_spi,data,1);
write(fd_cs,"1",1);
}
void LCD_WR_DATA(unsigned char Data)
{
char data[] = {
Data
};
write(fd_rs,"1",1);
write(fd_cs,"0",1);
write(fd_spi,data,1);
write(fd_cs,"1",1);
}
void LCD_WRITE_DATA(unsigned char * data,int count)
{
write(fd_rs,"1",1);
write(fd_cs,"0",1);
write(fd_spi,data,count);
write(fd_cs,"1",1);
}
void LCD_WR_DATA_16Bit(unsigned short Data)
{
//18Bit
LCD_WR_DATA((Data>>8)&0xF8);//RED
LCD_WR_DATA((Data>>3)&0xFC);//GREEN
LCD_WR_DATA(Data<<3);//BLUE
}
void LCD_WriteReg(unsigned char LCD_Reg, unsigned char LCD_RegValue)
{
LCD_WR_REG(LCD_Reg);
LCD_WR_DATA(LCD_RegValue);
}
void LCD_WriteRAM_Prepare(void)
{
LCD_WR_REG(lcddev.wramcmd);
}
void LCD_SetWindows(unsigned short xStar, unsigned short yStar,unsigned short xEnd,unsigned short 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
}
void LCD_Clear(unsigned short Color)
{
unsigned int i,j;
unsigned char data[lcddev.width * lcddev.height * 3];
LCD_SetWindows(0,0,lcddev.width-1,lcddev.height-1);
for(i=0;i<lcddev.width * lcddev.height;i++)
{
data[i * 3] = (Color>>8)&0xF8;
data[i * 3 + 1] = (Color>>3)&0xFC;
data[i * 3 + 2] = (Color<<3);
}
LCD_WRITE_DATA(data, lcddev.width * lcddev.height * 3);
}
void LCD_DrawPoint(unsigned short x,unsigned short y)
{
LCD_SetWindows(x,y,x,y);//设置光标位置
LCD_WR_DATA(POINT_COLOR);
}
void LCD_SetCursor(unsigned short Xpos, unsigned short Ypos)
{
LCD_SetWindows(Xpos,Ypos,Xpos,Ypos);
}
void LCD_direction(unsigned char 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)|(0<<6)|(0<<7));//BGR==1,MY==0,MX==0,MV==0
break;
case 1:
lcddev.width=LCD_H;
lcddev.height=LCD_W;
LCD_WriteReg(0x36,(1<<3)|(0<<7)|(1<<6)|(1<<5));//BGR==1,MY==1,MX==0,MV==1
break;
case 2:
lcddev.width=LCD_W;
lcddev.height=LCD_H;
LCD_WriteReg(0x36,(1<<3)|(1<<6)|(1<<7));//BGR==1,MY==0,MX==0,MV==0
break;
case 3:
lcddev.width=LCD_H;
lcddev.height=LCD_W;
LCD_WriteReg(0x36,(1<<3)|(1<<7)|(1<<5));//BGR==1,MY==1,MX==0,MV==1
break;
default:break;
}
}
void LCD_Reset(void)
{
write(fd_re,"1",1);
sleep(0.2);
write(fd_re,"0",1);
sleep(0.3);
write(fd_re,"1",1);
sleep(0.2);
}
void LCD_Init(void)
{
LCD_Reset(); //初始化之前复位
//************* ILI9488初始化**********//
LCD_WR_REG(0XF7);
LCD_WR_DATA(0xA9);
LCD_WR_DATA(0x51);
LCD_WR_DATA(0x2C);
LCD_WR_DATA(0x82);
LCD_WR_REG(0xC0);
LCD_WR_DATA(0x11);
LCD_WR_DATA(0x09);
LCD_WR_REG(0xC1);
LCD_WR_DATA(0x41);
LCD_WR_REG(0XC5);
LCD_WR_DATA(0x00);
LCD_WR_DATA(0x0A);
LCD_WR_DATA(0x80);
LCD_WR_REG(0xB1);
LCD_WR_DATA(0xB0);
LCD_WR_DATA(0x11);
LCD_WR_REG(0xB4);
LCD_WR_DATA(0x02);
LCD_WR_REG(0xB6);
LCD_WR_DATA(0x02);
LCD_WR_DATA(0x42);
LCD_WR_REG(0xB7);
LCD_WR_DATA(0xc6);
LCD_WR_REG(0xBE);
LCD_WR_DATA(0x00);
LCD_WR_DATA(0x04);
LCD_WR_REG(0xE9);
LCD_WR_DATA(0x00);
LCD_WR_REG(0x36);
LCD_WR_DATA((1<<3)|(0<<7)|(1<<6)|(1<<5));
LCD_WR_REG(0x3A);
LCD_WR_DATA(0x66);
LCD_WR_REG(0xE0);
LCD_WR_DATA(0x00);
LCD_WR_DATA(0x07);
LCD_WR_DATA(0x10);
LCD_WR_DATA(0x09);
LCD_WR_DATA(0x17);
LCD_WR_DATA(0x0B);
LCD_WR_DATA(0x41);
LCD_WR_DATA(0x89);
LCD_WR_DATA(0x4B);
LCD_WR_DATA(0x0A);
LCD_WR_DATA(0x0C);
LCD_WR_DATA(0x0E);
LCD_WR_DATA(0x18);
LCD_WR_DATA(0x1B);
LCD_WR_DATA(0x0F);
LCD_WR_REG(0XE1);
LCD_WR_DATA(0x00);
LCD_WR_DATA(0x17);
LCD_WR_DATA(0x1A);
LCD_WR_DATA(0x04);
LCD_WR_DATA(0x0E);
LCD_WR_DATA(0x06);
LCD_WR_DATA(0x2F);
LCD_WR_DATA(0x45);
LCD_WR_DATA(0x43);
LCD_WR_DATA(0x02);
LCD_WR_DATA(0x0A);
LCD_WR_DATA(0x09);
LCD_WR_DATA(0x32);
LCD_WR_DATA(0x36);
LCD_WR_DATA(0x0F);
LCD_WR_REG(0x11);
sleep(0.2);
LCD_WR_REG(0x29);
//设置LCD属性参数
LCD_direction(USE_HORIZONTAL);//设置LCD显示方向
}
int export_gpio(int no){
char cmd[100];
int ret = 0;
sprintf(cmd,"echo %d > /sys/class/gpio/export",no);
ret = system(cmd);
if(ret != 0) return ret;
sprintf(cmd,"echo out > /sys/class/gpio/gpio%d/direction",no);
ret = system(cmd);
return ret;
}
int init_cs(void)
{
return export_gpio(68);
}
int init_rs(void)
{
return export_gpio(71);
}
int init_re(void)
{
return export_gpio(72);
}
int main(){
int ret,cmd,i;
if(access(CS_GPIO,F_OK) == -1){
ret = init_cs();
}
if(ret != 0){
perror("export gpio 68 error");
return ret;
}
if(access(RS_GPIO,F_OK) == -1){
ret = init_rs();
}
if(ret != 0){
perror("export gpio 71 error");
return ret;
}
if(access(RE_GPIO,F_OK) == -1){
ret = init_re();
}
if(ret != 0){
perror("export gpio 72 error");
return ret;
}
fd_rs = open(RS_GPIO,O_RDWR);
ret = fd_rs;
if(ret < 0){
perror("open");
return ret;
}
fd_cs = open(CS_GPIO,O_RDWR);
ret = fd_cs;
if(ret < 0){
perror("open");
return ret;
}
fd_re = open(RE_GPIO,O_RDWR);
ret = fd_re;
if(ret < 0){
perror("open");
return ret;
}
fd_spi = open("/dev/char_test_dev_1",O_RDWR);
ret = fd_spi;
if(ret < 0){
perror("open /dev/char_test_dev_1 error");
return ret;
}
LCD_Init();
for (i = 0; i < 1; ++i)
{
LCD_Clear(RED);sleep(1);
LCD_Clear(GREEN);sleep(1);
LCD_Clear(BLUE);sleep(1);
}
close(fd_rs);
close(fd_cs);
close(fd_spi);
return 0;
}