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LCD configuration » fbfill_3-27-2015.cpp

fbfill source code with width and height arguments - Alexander Block, 03/27/2015 05:07 PM

 
/**
* \file fbfill.cpp
* very simple VGA frame buffer pattern fill
* to compile:
* /usr/local/angstrom/arm/bin/arm-angstrom-linux-gnueabi-g++ -o fbfill fbfill.cpp
*
* 2010 (c) Critical Link LLC. This file is licensed under
* the terms of the GNU General Public License version 2. This program
* is licensed "as is" without any warranty of any kind, whether express
* or implied.
*
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>


int main(int argc, char** argv)
{

int w = 640;
int h = 480;
int s = h/(8 *sizeof(unsigned short));
unsigned short bitlane = 0;
const char* devname = "/dev/fb";

for(int aa = 1; aa < argc -1; ++aa)
{
if(0 == strncmp(argv[aa],"-w",2) && argc > (aa+1))
{
w=atoi(argv[aa+1]);
++aa;
}
if(0 == strncmp(argv[aa],"-h",2) && argc > (aa+1))
{
h=atoi(argv[aa+1]);
++aa;
}
}
printf("Framebuffer w = %d h = %d\n", w,h);
FILE* fp = NULL;
// un-blank the display
fp = fopen("/sys/devices/platform/da8xx_lcdc.0/graphics/fb0/blank", "w");
if(fp)
{
fwrite("1\n",2,1,fp);
fclose(fp);
}

printf("opening %s\n",devname);
fp = fopen(devname,"w");
if (!fp)
{
perror(devname);
return(2);
}
unsigned short* pdata = new unsigned short[w];
for (int xx = 0; xx < (w); ++xx)
{
pdata[xx] = 0xFFFF;
}
fwrite(pdata,2,w,fp);
for (int yy = 1; yy < (h-1); ++yy)
{
pdata[0] = 0xFFFF;
for (int xx = 1; xx < (w-1); ++xx)
{
pdata[xx] = 1 << bitlane;
}
pdata[w-1] = 0xFFFF;
fwrite(pdata,2,w,fp);
if (yy && (yy%s == 0))
++bitlane;
}
for (int xx = 0; xx < (w); ++xx)
{
pdata[xx] = 0xFFFF;
}
fwrite(pdata,2,w,fp);
delete [] pdata;
return 0;
}
(9-9/11)
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