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samples: subsys: input: draw_touch_events: fix overflow in clear_screen loop #98719

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Merged
merged 2 commits into from
Nov 8, 2025
+10 −2
Merged

samples: subsys: input: draw_touch_events: fix overflow in clear_screen loop #98719

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687312e
samples: input: draw_touch_events: avoid avoid OOB writes
CharlesDias Nov 1, 2025
1a18019
boards: shields: st_lcd_dsi_mb1835: set LTDC pixel-format
CharlesDias Nov 5, 2025
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2 changes: 1 addition & 1 deletion boards/shields/st_lcd_dsi_mb1835/st_lcd_dsi_mb1835.overlay
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Original file line number Diff line number Diff line change
Expand Up @@ -88,7 +88,7 @@
status = "okay";
width = <480>;
height = <480>;
pixel-format = <PANEL_PIXEL_FORMAT_RGB_888>;
pixel-format = <PANEL_PIXEL_FORMAT_ARGB_8888>;

bl-ctrl-gpios = <&dsi_lcd_qsh_030 53 GPIO_ACTIVE_HIGH>;

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10 changes: 9 additions & 1 deletion samples/subsys/input/draw_touch_events/src/main.c
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Expand Up @@ -70,7 +70,15 @@ static void clear_screen(void)

for (x = 0; x < WIDTH; x += CROSS_DIM) {
for (y = 0; y < HEIGHT; y += CROSS_DIM) {
display_write(display_dev, x, y, &buf_desc, buffer_cross_empty);
struct display_buffer_descriptor ddesc = buf_desc;
uint16_t rem_w = WIDTH - x;
uint16_t rem_h = HEIGHT - y;

ddesc.width = MIN(buf_desc.width, rem_w);
ddesc.height = MIN(buf_desc.height, rem_h);
ddesc.buf_size = ddesc.width * ddesc.height * BPP;

display_write(display_dev, x, y, &ddesc, buffer_cross_empty);
}
}
}
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