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本文來源電子發燒友社區，作者：李先生，帖子地址：https://bbs.elecfans.com/jishu_2286690_1_1.html

前言

本文介紹使用framebuffer進行hdmi的顯示輸出測試。為后續的圖形界面的移植(比如LVGL)做好準備。

前提是已經了解應用程序的開發流程,見https://bbs.elecfans.com/jishu_2286643_1_1.html。

編寫代碼

#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
int main(int argc, char *argv[])
{
int fd = -1;
int ret = -1;
uint8_t *p_fb = 0;
struct fb_fix_screeninfo finfo;
struct fb_var_screeninfo vinfo;
memset(&finfo,0,sizeof(finfo));
memset(&vinfo,0,sizeof(vinfo));
/* 打開設備 */
fd = open(argv[1],O_RDWR);
if(fd < 0)
{
fprintf(stderr,"open %s err, %sn",argv[1],strerror(errno));
return -1;
}
/* 獲取設備信息 */
ret = ioctl(fd, FBIOGET_FSCREENINFO, &finfo);
if(ret < 0)
{
fprintf(stderr,"ioctl finfo err, %sn",strerror(errno));
close(fd);
return -1;
}
ret = ioctl(fd, FBIOGET_VSCREENINFO, &vinfo);
if(ret < 0)
{
fprintf(stderr,"ioctl vinfo err, %sn",strerror(errno));
close(fd);
return -1;
}
/* mmap 這里假設bits_per_pixel為32位, 所以p_fb定義為unsigned int *p_fb, 寫buffer也是按照unsigned int 寫, 實際應該根據bits_per_pixel大小進行讀寫 */
unsigned long len = vinfo.xres_virtual* vinfo.yres_virtual * vinfo.bits_per_pixel / 8;
p_fb = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if(p_fb == NULL)
{
fprintf(stderr,"mmap len %ld errn",len);
close(fd);
return -1;
}
fprintf(stderr,"x = %d y = %d bits = %d len = %ldn",vinfo.xres_virtual,vinfo.yres_virtual,vinfo.bits_per_pixel,len);
volatile int times = 30;
while(times--)
{
if(vinfo.bits_per_pixel == 16)
{
for(unsigned int i=0; i< len/2; )
{
*((uint16_t*)(p_fb + i)) = 0xF800;
i+=2;
}
usleep(atoi(argv[2])*1000);
for(unsigned int i=0; i< len/2;)
{
*((uint16_t*)(p_fb + i)) = 0x07E0;
i+=2;
}
usleep(atoi(argv[2])*1000);
for(unsigned int i=0; i< len/2;)
{
*((uint16_t*)(p_fb + i)) = 0x001F;
i+=2;
}
usleep(atoi(argv[2])*1000);
}
else
{
for(unsigned int i=0; i< len/4; )
{
*((uint32_t*)(p_fb + i)) = 0xFF0000;
i+=4;
}
usleep(atoi(argv[2])*1000);
for(unsigned int i=0; i< len/4;)
{
*((uint32_t*)(p_fb + i)) = 0x00FF00;
i+=4;
}
usleep(atoi(argv[2])*1000);
for(unsigned int i=0; i< len/4;)
{
*((uint32_t*)(p_fb + i)) = 0x0000FF;
i+=4;
}
usleep(atoi(argv[2])*1000);
}
}
munmap(p_fb,len);
close(fd);
return 0;
}