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ubb-vga: option -d to double the number of set/clear pairs, improving resolution

Browse Source 
- README: added compatibility of double mode
- ubb-vga.c (usage, main): new option -d to double the number of set/clear
  pairs (making lines longer and the apparent pixel clock slower)
- ubb-vga.c (grab, session, main): have a complete set/clear pair for each
  pixel in double mode
This commit is contained in:
Werner Almesberger 2011-04-24 21:09:50 -03:00
parent dab839ab66
commit 67107d0062
2 changed files with 40 additions and 13 deletions
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11
ubb-vga/README
View File

@ -43,11 +43,18 @@ don't mind.
Compatibility
-------------
ubb-vga has been tested with the following monitors:
ubb-vga in single mode has been tested with the following monitors:
Display Size Quality
Display Monitor size Quality
----------------------- --------------- ----------------------------------
Xenon XEN-1510T 15", 1024x768 good
Samsung 206NW 20", 1680x1050 poor (horizontal instability)
LG W2243C 22", 1920x1080 acceptable (slight instability)
LG W2243L 22", 1920x1080 acceptable (slight instability)
In double mode:
Display Pixels missing Quality
left/right
----------------------- --------------- ------------------
Xenon XEN-1510T 5 / 25 good

42
ubb-vga/ubb-vga.c
View File

@ -229,7 +229,7 @@ static void until(uint16_t cycles)
/* ----- Frame buffer output ----------------------------------------------- */
static int line_pairs = 160; /* set/unset pairs */
static int line_pairs = 160; /* set/clear pairs */
static int line_cycles = US(36); /* nominally 31.77 us, but we're too slow */
@ -366,19 +366,28 @@ static void grid(uint8_t *f)
}
static void grab(uint8_t *f)
static void grab(uint8_t *f, int single)
{
uint32_t *fb = map(0x01d00000, 4*320*240);
int x, y;
uint32_t pix;
uint8_t r, g, b;
for (y = 0; y != 240; y++)
for (x = 0; x != 320; x++) {
pix = *fb++;
*f++ = pattern(!(x & 1),
((pix >> 16) & 255) >= thres,
((pix >> 8) & 255) >= thres,
(pix & 255) >= thres);
r = pix >> 16;
g = pix >> 8;
b = pix;
if (single)
*f++ = pattern(!(x & 1),
r >= thres, g >= thres, b >= thres);
else {
*f++ = pattern(1,
r >= thres, g >= thres, b >= thres);
*f++ = pattern(0,
r >= thres, g >= thres, b >= thres);
}
}
}
@ -386,13 +395,13 @@ static void grab(uint8_t *f)
/* ----- Command-line parsing and main loop -------------------------------- */
static void session(int frames)
static void session(int frames, int single)
{
uint8_t f[2*line_pairs*(240+1)];
int i;
memset(f, 0, sizeof(f));
grab(f);
grab(f, single);
// grid(f);
disable_interrupts();
@ -406,7 +415,12 @@ static void session(int frames)
static void usage(const char *name)
{
fprintf(stderr, "usage: %s frames [threshold]\n", name);
fprintf(stderr,
"usage: %s frames -d [threshold]\n\n"
" frames number of frames to display\n"
" threshold channel on/off threshold\n\n"
" -d double the number of set/clear pairs\n"
, name);
exit(1);
}
@ -414,10 +428,16 @@ static void usage(const char *name)
int main(int argc, char *const *argv)
{
int frames;
int single = 1;
int c;
while ((c = getopt(argc, argv, "")) != EOF)
while ((c = getopt(argc, argv, "d")) != EOF)
switch (c) {
case 'd':
single = 0;
line_pairs = 320;
line_cycles = US(36+26);
break;
default:
usage(*argv);
}
@ -434,7 +454,7 @@ int main(int argc, char *const *argv)
}
setup();
session(frames);
session(frames, single);
cleanup();
return 0;