Added convert method to EEPROM to transfer data from partition to nvs (espressif#2841)

* Added convert method to transfer data from partition to nvs

* Could have sworn I changed the return when I made the label

* Empty state should be 0xFF.  Fixed some logging levels

* Set result on success

Author: lbernstone

libraries/EEPROM/library.properties

@@ -1,9 +1,9 @@
 name=EEPROM
-version=1.0
+version=1.0.3
 author=Ivan Grokhotkov
 maintainer=Paolo Becchi <[email protected]>
-sentence=Enables reading and writing data to the permanent FLASH storage, up to 4kb.
+sentence=Enables reading and writing data a sequential, addressable FLASH storage
 paragraph=
 category=Data Storage
 url=http://arduino.cc/en/Reference/EEPROM
-architectures=esp32
+architectures=esp32

libraries/EEPROM/src/EEPROM.cpp

@@ -25,6 +25,7 @@
 
 #include "EEPROM.h"
 #include <nvs.h>
+#include <esp_partition.h>
 #include <esp_log.h>
 
 EEPROMClass::EEPROMClass(void)
@@ -111,7 +112,7 @@ bool EEPROMClass::begin(size_t size) {
          log_e("Not enough memory to expand EEPROM!");
          return false;
       }
-      memset(key_data, 0, size);
+      memset(key_data, 0xFF, size);
       if(key_size) {
         log_i("Expanding EEPROM from %d to %d", key_size, size);
 	// hold data while key is deleted
@@ -214,6 +215,67 @@ uint16_t EEPROMClass::length ()
   return _user_defined_size;
 }
 
+/* 
+   Convert EEPROM partition into nvs blob
+   Call convert before you call begin
+*/
+uint16_t EEPROMClass::convert (bool clear, const char* EEPROMname, const char* nvsname)
+{
+  uint16_t result = 0;
+  const esp_partition_t* mypart = esp_partition_find_first(ESP_PARTITION_TYPE_DATA, ESP_PARTITION_SUBTYPE_ANY, EEPROMname);
+  if (mypart == NULL) {
+    log_i("EEPROM partition not found for conversion");
+    return result;
+  }
+
+  size_t size = mypart->size;
+  uint8_t* data = (uint8_t*) malloc(size);
+  if (!data) {
+    log_e("Not enough memory to convert EEPROM!");
+    goto exit;
+  }
+
+  if (esp_partition_read (mypart, 0, (void *) data, size) != ESP_OK) {
+    log_e("Unable to read EEPROM partition");
+    goto exit;
+  }
+
+  bool empty;
+  empty = true;
+  for (int x=0; x<size; x++) {
+    if (data[x] != 0xFF) {
+      empty = false;
+      break;
+    }
+  }
+  if (empty) {
+    log_i("EEPROM partition is empty, will not convert");
+    goto exit;
+  }
+
+  nvs_handle handle;
+  if (nvs_open(nvsname, NVS_READWRITE, &handle) != ESP_OK) {
+    log_e("Unable to open NVS");
+    goto exit;
+  }
+  esp_err_t err;
+  err = nvs_set_blob(handle, nvsname, data, size);
+  if (err != ESP_OK) {
+    log_e("Unable to add EEPROM data to NVS: %s", esp_err_to_name(err));
+    goto exit;
+  }
+  result = size;
+ 
+  if (clear) {
+    if (esp_partition_erase_range (mypart, 0, size) != ESP_OK) {
+      log_w("Unable to clear EEPROM partition");
+    }
+  } 
+exit:
+  free(data);
+  return result;
+}
+
 /*
    Read 'value' from 'address'
 */

libraries/EEPROM/src/EEPROM.h

@@ -47,6 +47,7 @@ class EEPROMClass {
     void end();
 
     uint8_t * getDataPtr();
+    uint16_t convert(bool clear, const char* EEPROMname = "eeprom", const char* nvsname = "eeprom");
 
     template<typename T>
     T &get(int address, T &t) {