From 3954831a270606b83ccd0a23058cce32c0dfec3d Mon Sep 17 00:00:00 2001
From: Stephan Hadinger <stephan.hadinger@gmail.com>
Date: Sat, 15 Jan 2022 10:42:25 +0100
Subject: [PATCH] LVGL screenshot disk full protection

---
 tasmota/xdrv_54_lvgl.ino | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/tasmota/xdrv_54_lvgl.ino b/tasmota/xdrv_54_lvgl.ino
index dd4089b0c..d911bb48d 100644
--- a/tasmota/xdrv_54_lvgl.ino
+++ b/tasmota/xdrv_54_lvgl.ino
@@ -71,11 +71,13 @@ void lv_flush_callback(lv_disp_drv_t *disp, const lv_area_t *area, lv_color_t *c
       uint16_t * pix = (uint16_t*) color_p;
       for (uint32_t i = 0; i < btw / 2; i++) (pix[i] = pix[i] << 8 | pix[i] >> 8);
 #endif
-      int32_t ret = glue->getScreenshotFile()->write((const uint8_t*) color_p, btw);
-      if (ret >= 0) {
-        btw -= ret;
-      } else {
-        btw = 0;  // abort
+      if (btw > 0) {    // if we had a previous error (ex disk full) don't try to write anymore
+        int32_t ret = glue->getScreenshotFile()->write((const uint8_t*) color_p, btw);
+        if (ret >= 0) {
+          btw -= ret;
+        } else {
+          btw = 0;  // abort
+        }
       }
     }
     lv_disp_flush_ready(disp);