My app keep crashing when I call a screen change from a bluetooth write function. The central sends a message to the peripheral. The peripheral wakes up the display and tries to show a lvgl screen with a single label. I see it for a second. I keep thinking I need a message queue or a different thread for the display. I can try a few things but didn't want to guess.
This is the write callback on the peripheral:
static ssize_t write_vnd(struct bt_conn *conn, const struct bt_gatt_attr *attr,
const void *buf, uint16_t len, uint16_t offset,
uint8_t flags)
{
//this means a write has happened to the peripheral, the controller has written
uint8_t *value = attr->user_data;
if (offset + len > VND_MAX_LEN) {
return BT_GATT_ERR(BT_ATT_ERR_INVALID_OFFSET);
}
memcpy(value + offset, buf, len);
value[offset + len] = 0;
screenmanager_show_token();
eventhandler_reset();
return len;
}it calls the:
void screenmanager_show_token() {
//clear the current screen and show the next
lv_obj_clean(lv_scr_act());
screen_token_init();
}which is just:
void screen_token_init() {
lv_obj_t *token_label;
token_label = lv_label_create(lv_scr_act());
lv_label_set_text(token_label, "Hello World");
lv_obj_align(token_label, LV_ALIGN_TOP_MID, 0, 0);
}