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lvgl: kscan: Only process prev state if it has been updated

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When no message was get from kscan_msgq queue, the prev state
(x/y point) was processed as a new state. During process its
coordinates could be inverted or modified, depending on the
LVGL_POINTER_KSCAN_SWAP_XY, LVGL_POINTER_KSCAN_INVERT_X,
LVGL_POINTER_KSCAN_INVERT_Y or display orientation configuration.
In these cases, it could cause wrong input data.

Signed-off-by: Robin-Charles Guihéneuf <robin-charles@hotmail.fr>
This commit is contained in:
Robin-Charles Guihéneuf 2020-11-15 11:05:50 +01:00 • committed by Carles Cufí
commit f0250d5c71
1 changed files with 5 additions and 2 deletions
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7
lib/gui/lvgl/lvgl.c
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@ -206,10 +206,12 @@ static bool lvgl_pointer_kscan_read(lv_indev_drv_t *drv, lv_indev_data_t *data)
.state = LV_INDEV_STATE_REL,
};
if (k_msgq_get(&kscan_msgq, &curr, K_NO_WAIT) == 0) {
prev = curr;
if (k_msgq_get(&kscan_msgq, &curr, K_NO_WAIT) != 0) {
goto set_and_release;
}
prev = curr;
disp = lv_disp_get_default();
disp_dev = disp->driver.user_data;
@ -260,6 +262,7 @@ static bool lvgl_pointer_kscan_read(lv_indev_drv_t *drv, lv_indev_data_t *data)
prev.point.y = x;
}
set_and_release:
*data = prev;
return k_msgq_num_used_get(&kscan_msgq) > 0;