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video.c: working version, with screen grabber

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This commit is contained in:
Werner Almesberger 2011-04-24 00:10:23 -03:00
parent b85ae15479
commit 18f2957cd4
1 changed files with 39 additions and 9 deletions
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48
video/video.c
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@ -56,6 +56,9 @@
#define DEFAULT_COUNT (1000*1000)
static uint8_t thres = 63;
/* ----- Ben hardware ------------------------------------------------------ */
@ -127,23 +130,32 @@ static void release_timer(void)
}
static void ben_setup(void)
static void *map(off_t addr, size_t size)
{
volatile void *base;
int fd;
void *mem;
fd = open("/dev/mem", O_RDWR | O_SYNC);
if (fd < 0) {
perror("/dev/mem");
exit(1);
}
base = mmap(NULL, PAGE_SIZE*3*16, PROT_READ | PROT_WRITE, MAP_SHARED,
fd, SOC_BASE);
if (base == MAP_FAILED) {
mem = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, addr);
if (mem == MAP_FAILED) {
perror("mmap");
exit(1);
}
return mem;
}
static void ben_setup(void)
{
volatile void *base;
base = map(SOC_BASE, PAGE_SIZE*3*16);
icmr = base+0x1004;
icmsr = base+0x1008;
icmcr = base+0x100c;
@ -201,10 +213,9 @@ static uint32_t pick(int set, int bit, uint32_t val)
}
static uint32_t pattern(int r, int g, int b, int hsync, int vsync, int set)
static uint32_t pattern(int set, int r, int g, int b)
{
return pick(set, r, R) | pick(set, g, G) | pick(set, b, B) |
pick(set, hsync, HSYNC) | pick(set, vsync, VSYNC);
return pick(set, r, R) | pick(set, g, G) | pick(set, b, B);
}
@ -360,13 +371,31 @@ static void grid(uint8_t *f)
}
static void grab(uint8_t *f)
{
uint32_t *fb = map(0x01d00000, 4*320*240);
int x, y;
uint32_t pix;
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);
}
}
static void session(int n)
{
uint8_t f[320*(240+1)];
int i;
memset(f, 0, sizeof(f));
grid(f);
grab(f);
// grid(f);
disable_interrupts();
@ -379,6 +408,7 @@ static void session(int n)
int main(int argc, char **argv)
{
thres = atoi(argv[2]);
setup();
session(atoi(argv[1]));
cleanup();