FlashMemory Address for EEPROM
meakashrao opened this issue · comments
Board
ESP32 Dev Module
Device Description
ESP32 Dev Kit C
Hardware Configuration
Nothing is connected, just the bare board
Version
v3.0.0
IDE Name
Platform IO
Operating System
Windows 11
Flash frequency
40Mhz
PSRAM enabled
no
Upload speed
115200
Description
So, I have an Arduino code that reads from specific EEPROM Library and then when needed reads from it.
Now, as per requirement everything needs to shifted to ESP-IDF,
So, I can't use EEPROM Library and there are already some machines in the Field and they need to be remotely updated(we have taken care of the remote update) but it's important for device configuration to read from these EEPROM Locations
Now since ESP doesn't have EEPROM and uses NVS(Flash Partition) for its EEPROM Emulation. Please correct me if I am wrong
I need to to what Flash address is the EEPROM Data written and Read from when I do EEPROM.commit() and EEPROM.read(int address).
My EEPROM.begin is 80
Partition Table:
ESP-IDF Partition Table
Name, Type, SubType, Offset, Size, Flags
nvs,data,nvs,0x9000,0x5000,,
otadata,data,ota,0xe000,0x2000,,
app0,app,ota_0,0x10000,0x1E0000,,
app1,app,ota_1,0x1F0000,0x1E0000,,
spiffs,data,spiffs,0x3D0000,0x30000,,
The Partition table is kept the same for both ESP-IDF and Arduino Code
Please help me with how to find the EEPROM Addresses.
Sketch
for (int i = 0; i < 8; i++)
{
MACHINEID[i] = byte(EEPROM.read(i + 11));
MACHINEID[8] = '\0';
}
byte var_OTA = byte(EEPROM.read(0));
if (var_OTA == 255)
{
OTA_flag = 0;
}
else
{
OTA_flag = EEPROM.read(0);
}
byte var = byte(EEPROM.read(65));
if(var == 255)
{
lidlessMode = 0;
}
else
{
lidlessMode = EEPROM.read(65);
if(lidlessMode !=1)
{
addErrorMessage("EEPROMLidlessNot1");
}
}
byte encrypt_var = byte(EEPROM.read(encryptionEEPROMAddress));
// Serial.print("encrypt_var: ");
// Serial.println(encrypt_var);
if(encrypt_var == 255)
{
useEncryption = 0;
}
else
{
useEncryption = EEPROM.read(encryptionEEPROMAddress);
//Serial.print("useEncryption: "); Serial.println(useEncryption);
if(useEncryption >= 1)
{
addErrorMessage("EEPROMEncrpyNot1-0");
}
}Debug Message
The above code is some important configurations that I read from Arduino setup().
Other Steps to Reproduce
No response
I have checked existing issues, online documentation and the Troubleshooting Guide
- I confirm I have checked existing issues, online documentation and Troubleshooting guide.
The EEPROM is saved as a blob in NVS. You can "address" an offset in that blob, but the actual blob address changes when you save the EEPROM. It's not a constant address in flash
You can "address" an offset in that blob, but the actual blob address changes when you save the EEPROM. It's not a constant address in flash
Is there a way through which we can read the offset and read the data only once and in further power cycles I will use NVS (key value pair) as I will copy to the NVS location.
Out of the 4 mentioned, the Machine ID is the most important one and I need to read.
I am not aware of such way. You can look into the EEPROM library source and convert that to pure IDF. It's just an abstraction .
Your time would likely be better spent updating whatever legacy code you have using EEPROM to use individual elements or a struct and store that in nvs rather than adding another inefficient compatibility layer.