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examples/fb: fix framebuffer demo not working with BUILD_KERNEL #3228

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Merged
xiaoxiang781216 merged 1 commit into from
Dec 1, 2025
Merged

examples/fb: fix framebuffer demo not working with BUILD_KERNEL #3228

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18 changes: 15 additions & 3 deletions examples/fb/fb_main.c
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Original file line number Diff line number Diff line change
Expand Up @@ -198,6 +198,7 @@ static int fb_init_mem2(FAR struct fb_state_s *state)
int ret;
uintptr_t buf_offset;
struct fb_planeinfo_s pinfo;
FAR void *fbmem;

memset(&pinfo, 0, sizeof(pinfo));
pinfo.display = state->pinfo.display + 1;
Expand All @@ -207,6 +208,17 @@ static int fb_init_mem2(FAR struct fb_state_s *state)
return EXIT_FAILURE;
}

fbmem = mmap(NULL, pinfo.fblen, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_FILE, state->fd, 0);

if (fbmem == MAP_FAILED)
{
int errcode = errno;
fprintf(stderr, "ERROR: ioctl(FBIOGET_PLANEINFO) failed: %d\n",
errcode);
return EXIT_FAILURE;
}

/* Check bpp */

if (pinfo.bpp != state->pinfo.bpp)
Expand All @@ -219,7 +231,7 @@ static int fb_init_mem2(FAR struct fb_state_s *state)
* It needs to be divisible by pinfo.stride
*/

buf_offset = pinfo.fbmem - state->fbmem;
buf_offset = fbmem - state->fbmem;

if ((buf_offset % state->pinfo.stride) != 0)
{
Expand All @@ -236,7 +248,7 @@ static int fb_init_mem2(FAR struct fb_state_s *state)
/* Use consecutive fbmem2. */

state->mem2_yoffset = state->vinfo.yres;
state->fbmem2 = pinfo.fbmem + state->mem2_yoffset * pinfo.stride;
state->fbmem2 = fbmem + state->mem2_yoffset * pinfo.stride;
printf("Use consecutive fbmem2 = %p, yoffset = %" PRIu32"\n",
state->fbmem2, state->mem2_yoffset);
}
Expand All @@ -245,7 +257,7 @@ static int fb_init_mem2(FAR struct fb_state_s *state)
/* Use non-consecutive fbmem2. */

state->mem2_yoffset = buf_offset / state->pinfo.stride;
state->fbmem2 = pinfo.fbmem;
state->fbmem2 = fbmem;
printf("Use non-consecutive fbmem2 = %p, yoffset = %" PRIu32"\n",
state->fbmem2, state->mem2_yoffset);
}
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