arm之LCD（键盘输入）
来源：互联网 发布：java 延时10秒 编辑：程序博客网 时间：2024/05/21 09:29
#include <stdio.h>#include <sys/types.h>#include <sys/stat.h>#include <fcntl.h>#include <unistd.h>#include <sys/mman.h>#include<string.h>int *plcd = NULL;char numprint[4][175];char number2[4];char text[8][175]={ 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清屏或者初始化LCD屏幕*******************************************************/void lcd_WR_color(){ //将整个lcd清除成白色 //从坐标为0,0点的位置开始画一个800*480的矩形 int x,y; for (y = 0; y < 480; y++) { for (x = 0; x < 800; x++) lcd_draw_point(x, y, 0xffffffff); }}/********************************************************* 在坐标（X0,Y0）处画一个显示一个宽度为width,* 高度为hight，颜色为color的矩形 *******************************************************/void lcd_draw_rectangle(int x,int y,int w,int h,int color){ int i,j; for (i= y; i < y+h; i++) //行 { for (j = x; j <x+w; j++) lcd_draw_point(j, i, color); }}/* ******************************************************** 在（X0,Y0）处画一个显示一个半径为r的空心圆*******************************************************/void lcd_draw_circle(int x,int y,int r,int color){ int i,j; int s; for(i=0;i<480;i++) { s=0; for(j=0;j<800;j++) { s=(y-i)*(y-i)+(x-j)*(x-j); if(s>=((r-1)*(r-1))&&s<=((r+1)*(r+1))) lcd_draw_point(j, i, color); } }}/********************************************************* 在（X0,Y0）处画一个显示一个半径为r的实心圆*******************************************************/void lcd_draw_disc(int x,int y,int r,int color){ int i,j; for(i=0;i<480;i++) { for(j=0;j<800;j++) { if((j-x)*(j-x)+(i-y)*(i-y)<=r*r) lcd_draw_point(i, j, color); } }}/********************************************************* 显示汉字********************************************************/void lcd_draw_word(int X, int Y, char (*ch)[175], int len, int w, int color){ int i,j,k; for(k=0; k<8; k++) { for(i=0;i<len;i++) { for(j=7;j>0;j--) { if(ch[k][i] >>j&1) { lcd_draw_point(7-j+8*(i%(len/w))+X, i/(len/w)+Y, color); } } } X+=45; }}/********************************************************* 输入一个数字（四位数以内，包含四位数）********************************************************/void number_input(){ //输入一个数字 int num,i=0; //char chnum[4]; scanf("%d",&num); if(num/1000>0) //判断是否是四位数 { number2[0]=(num/1000)%10+48; //千位 number2[1]=(num/100)%10+48; //百位 number2[2]=(num/10)%10+48; //十位 number2[3]=num%10+48; //个位 } else if(num/100>0) //判断是否是三位数 { number2[0]=(num/100)%10+48; //百位 number2[1]=(num/10)%10+48; //十位 number2[2]=num%10+48; //个位 } else if(num/10>0) //判断是否是两位数 { number2[0]=(num/10)%10+48; //十位 number2[1]=num%10+48; //个位 } else if(num>0) //判断是否是个位数 { number2[0]=num%10+48; } else{ printf("输入的数字不是大于0的整数\n"); } //return chnum;}/********************************************************* 显示出该数字********************************************************/void lcd_draw_number(){ int i=0,j=0; //************* number_input(); //判断该数字 for(i=0;i<sizeof(number2);i++) { if(number2[i]=='0') for(j=0;j<175;j++) numprint[i][j]=number[0][j]; //0 else if(number2[i]=='1') for(j=0;j<175;j++) numprint[i][j]=number[1][j]; //1 else if(number2[i]=='2') for(j=0;j<175;j++) numprint[i][j]=number[2][j]; //2 else if(number2[i]=='3') for(j=0;j<175;j++) numprint[i][j]=number[3][j]; //3 else if(number2[i]=='4') for(j=0;j<175;j++) numprint[i][j]=number[4][j]; //4 else if(number2[i]=='5') for(j=0;j<175;j++) numprint[i][j]=number[5][j]; //5 else if(number2[i]=='6') for(j=0;j<175;j++) numprint[i][j]=number[6][j]; //6 else if(number2[i]=='7') for(j=0;j<175;j++) numprint[i][j]=number[7][j]; //7 else if(number2[i]=='8') for(j=0;j<175;j++) numprint[i][j]=number[8][j]; //8 else if(number2[i]=='9') for(j=0;j<175;j++) numprint[i][j]=number[9][j]; //9 else for(j=0;j<175;j++) numprint[i][j]=' '; } lcd_draw_word(100, 40, numprint, 175, 50, 0); //打印数字}/********************************************************* 主函数********************************************************/int main(int argc, char *argv[]){ //打开LCD int fd; fd = open("/dev/fb0", O_RDWR); //if (fd == -1) if (-1 == fd) { perror("open lcd error"); return 0; } //内存映射 //把整个LCD映射到内存中，plcd就指向了映射的内存的首///地址=> plcd 指向了lcd的第0个像素点 //我们在程序中操作plcd这个指针就相当于操作lcd了 plcd = mmap(NULL, 800*480*4,PROT_READ | PROT_WRITE,MAP_SHARED,fd,0); //屏幕 int color[480][800]; //lcd 初始化白色屏幕 lcd_WR_color(); //1、在lcd的坐标为50,50的位置开始 画一个50*50的矩形 //lcd_draw_rectangle(50,50,50,50,0x00fef0ef); //2、在lcd的坐标为200,200的位置开始，画一个实心圆半径80 //lcd_draw_disc(200,200,80,0xadbc00ff); //3、在lcd的坐标为400,200的位置开始，画一个空心圆半径80 //lcd_draw_circle(400,400,80,0); //4、打印汉字 智能家居控制系统 //lcd_draw_word(100, 40, text, 175, 35, 0); //5、在键盘上输入一个数字并显示 lcd_draw_number(); close(fd); return 0;}阅读全文
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