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/*********************************************************************************
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* Copyright: (C) 2021 Guo Wenxue<Email:guowenxue@gmail.com QQ:281143292>
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* All rights reserved.
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*
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* Filename: test_key.c
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* Description: This file used to test GPIO button driver builtin Linux kernel on ARM board
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*
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* Version: 1.0.0(11/17/2021~)
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* Author: Guo Wenxue <guowenxue@gmail.com>
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* ChangeLog: 1, Release initial version on "11/17/2021 02:46:18 PM"
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*
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* Linux Clear LCD screen command :
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*
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* dd if=/dev/zero of=/dev/fb0 bs=320 count=720 [ 240*(24bpp/8)=720 ]
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*
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********************************************************************************/
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#include <unistd.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <linux/fb.h>
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#include <sys/mman.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#define CONFIG_RGB565
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#ifdef CONFIG_RGB565 /* RRRR RGGG GGGB BBBB */
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#define RED 0xF800
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#define GREEN 0x07E0
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#define BLUE 0x001F
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#define YELLOW 0xFFE0
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#define WHITE 0xFFFF
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#endif
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void fill_color16(short *fb_addr, short bit_map, int psize)
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{
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int i;
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for(i=0; i<psize; i++) {
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*fb_addr = bit_map;
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fb_addr++;
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}
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}
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int main ()
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{
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int fp=0;
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struct fb_var_screeninfo vinfo;
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struct fb_fix_screeninfo finfo;
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long screensize=0;
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char *fbp = NULL, *test_fbp=NULL;
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int x = 0, y = 0;
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long location = 0;
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int i;
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int num = 5;
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int pix_size=0;
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fp = open("/dev/fb0", O_RDWR);
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if(fp < 0) {
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printf("Error : Can not open framebuffer device/n");
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exit(1);
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}
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if(ioctl(fp, FBIOGET_FSCREENINFO, &finfo)){
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printf("Error reading fixed information/n");
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exit(2);
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}
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if(ioctl(fp, FBIOGET_VSCREENINFO, &vinfo)){
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printf("Error reading variable information/n");
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exit(3);
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}
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screensize = vinfo.xres * vinfo.yres * vinfo.bits_per_pixel / 8;
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printf("The phy mem = 0x%x, total size = %d(byte)\n", finfo.smem_start, finfo.smem_len);
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printf("xres = %d, yres = %d, bits_per_pixel = %d\n", vinfo.xres, vinfo.yres, vinfo.bits_per_pixel);
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printf("So the screensize = %d(byte), using %d frame\n", screensize, finfo.smem_len/screensize);
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printf("vinfo.xoffset = %d, vinfo.yoffset = %d\n", vinfo.xoffset, vinfo.yoffset);
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printf("vinfo.vmode is :%d\n", vinfo.vmode);
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printf("finfo.ypanstep is :%d\n", finfo.ypanstep);
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printf("vinfo.red.offset=0x%x\n", vinfo.red.offset);
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printf("vinfo.red.length=0x%x\n", vinfo.red.length);
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printf("vinfo.green.offset=0x%x\n", vinfo.green.offset);
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printf("vinfo.green.length=0x%x\n", vinfo.green.length);
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printf("vinfo.blue.offset=0x%x\n", vinfo.blue.offset);
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printf("vinfo.blue.length=0x%x\n", vinfo.blue.length);
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printf("vinfo.transp.offset=0x%x\n", vinfo.transp.offset);
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printf("vinfo.transp.length=0x%x\n", vinfo.transp.length);
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fbp =(char *)mmap(0, screensize, PROT_READ | PROT_WRITE, MAP_SHARED, fp,0);
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if ((int)fbp == -1)
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{
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printf ("Error: failed to map framebuffer device to memory./n");
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exit (4);
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}
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printf("Get virt mem = %p\n", fbp);
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pix_size = vinfo.xres * vinfo.yres;
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/* using first frame, for FBIOPAN_DISPLAY
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* 当刷新需要调用FBIOPAN_DISPLAY， 要告知驱动刷哪块帧， 用到下面两个参数
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* 如果使用第二帧buffer -> vinfo.xoffset = 0; vinfo.yoffset = vinfo.yres;
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*/
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vinfo.xoffset = 0;
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vinfo.yoffset = 0;
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/* show color loop */
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while(num--) {
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printf("\ndrawing red ...\n");
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fill_color16((short *)fbp, RED, pix_size);
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//ioctl(fp, FBIOPAN_DISPLAY, &vinfo);
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sleep(3);
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printf("\ndrawing green ...\n");
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fill_color16((short *)fbp, GREEN, pix_size);
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//ioctl(fp, FBIOPAN_DISPLAY, &vinfo);
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sleep(3);
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printf("\ndrawing blue ...\n");
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fill_color16((short *)fbp, BLUE, pix_size);
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//ioctl(fp, FBIOPAN_DISPLAY, &vinfo);
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sleep(3);
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printf("\ndrawing yellow ...\n");
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fill_color16((short *)fbp, YELLOW, pix_size);
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//ioctl(fp, FBIOPAN_DISPLAY, &vinfo);
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sleep(3);
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}
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#if 1
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/*这是你想画的点的位置坐标,(0，0)点在屏幕左上角*/
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x = 10;
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y = 10;
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location = x * (vinfo.bits_per_pixel / 8) + y * finfo.line_length;
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test_fbp = fbp + location;
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printf("draw line.......\n");
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for(i = 0; i < (vinfo.xres - x); i++)
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*test_fbp++ = i+30;
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//ioctl(fp, FBIOPAN_DISPLAY, &vinfo);
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#endif
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munmap(fbp, screensize); /*解除映射*/
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close (fp);
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return 0;
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}
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