From b465858563b05addf25e91e1e9407883cd4256f7 Mon Sep 17 00:00:00 2001
From: me-no-dev <hristo@espressif.com>
Date: Tue, 4 Apr 2017 01:27:26 +0300
Subject: [PATCH] Check and format NVS partition if size has changed

---
 cores/esp32/esp32-hal-misc.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/cores/esp32/esp32-hal-misc.c b/cores/esp32/esp32-hal-misc.c
index b5ea9d67..a2535500 100644
--- a/cores/esp32/esp32-hal-misc.c
+++ b/cores/esp32/esp32-hal-misc.c
@@ -18,6 +18,8 @@
 #include "freertos/task.h"
 #include "esp_attr.h"
 #include "nvs_flash.h"
+#include "nvs.h"
+#include "esp_partition.h"
 #include <sys/time.h>
 
 void yield()
@@ -76,7 +78,21 @@ void init() {}
 
 void initArduino()
 {
-    nvs_flash_init();
+    esp_err_t err = nvs_flash_init();
+    if(err == ESP_ERR_NVS_NO_FREE_PAGES){
+        const esp_partition_t* partition = esp_partition_find_first(ESP_PARTITION_TYPE_DATA, ESP_PARTITION_SUBTYPE_DATA_NVS, NULL);
+        if (partition != NULL) {
+            err = esp_partition_erase_range(partition, 0, partition->size);
+            if(!err){
+                err = nvs_flash_init();
+            } else {
+                log_e("Failed to format the broken NVS partition!");
+            }
+        }
+    }
+    if(err) {
+        log_e("Failed to initialize NVS! Error: %u", err);
+    }
     init();
     initVariant();
 }