unable to write efuse

[Endorfin35]

Board

ESP32 Dev Module

Device Description

Devkit

Hardware Configuration

No connection

Version

v2.0.11

IDE Name

Platformio & Arduino Framework

Operating System

win 10

Flash frequency

40

PSRAM enabled

no

Upload speed

115200

Description

I want to read/write 3 byte data to Efuse memory with the program code. After writing the data, when I restart and read again, the data is lost. I'm adding the links I got reference below.

I thought I should call the esp_efuse_burn_new_values() function after the writing process, but when I call this function, I cannot read the data I wrote.

I don't understand what should I do? I am requesting your support.

https://esp32.com/viewtopic.php?t=5742
#2556
https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/system/efuse.html
https://www.espressif.com/sites/default/files/documentation/esp32_technical_reference_manual_en.pdf#efuse

Sketch

#include "Arduino.h"
#include <soc/efuse_reg.h>
#include "esp_efuse.h"

void setup()
{
  Serial.begin(115200);
  Serial.println();
  Serial.println("EFUSE TEST");

  uint32_t data_1; 
  uint32_t data_2 = 0xF1F2F3F4;
  uint32_t data_3;

  Serial.print("WILL BE WRTIE   : "); 
  Serial.println(data_2, HEX);

  data_1 = REG_READ(EFUSE_BLK1_WDATA7_REG);
  Serial.print("[OLD] BLK DATA  : "); 
  Serial.println(data_1, HEX);

  //esp_efuse_reset();
  REG_WRITE(EFUSE_BLK1_WDATA7_REG,data_2);
  //esp_efuse_burn_new_values();

  data_3 = REG_READ(EFUSE_BLK1_WDATA7_REG);
  Serial.print("[NEW] BLK1 DATA : "); 
  Serial.println(data_3, HEX);

}

Debug Message

// Serial Output
EFUSE TEST
WILL BE WRTIE   : F1F2F3F4
[OLD] BLK DATA  : 0
[NEW] BLK1 DATA : F1F2F3F4

// Serial Output Second attemp with esp_efuse_burn_new_values()
WILL BE WRTIE   : F1F2F3F4
[OLD] BLK DATA  : 0
[NEW] BLK1 DATA : 0

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.

[SuGlider]

Looking into Arduino IDF sdkconfig file I can see this:

#
# eFuse Bit Manager
#
# CONFIG_EFUSE_CUSTOM_TABLE is not set
# CONFIG_EFUSE_VIRTUAL is not set
# CONFIG_EFUSE_CODE_SCHEME_COMPAT_NONE is not set
CONFIG_EFUSE_CODE_SCHEME_COMPAT_3_4=y
# CONFIG_EFUSE_CODE_SCHEME_COMPAT_REPEAT is not set
CONFIG_EFUSE_MAX_BLK_LEN=192
# end of eFuse Bit Manager

I don't know how you are reding the efuses, but I think that it is not possible to read efuses using Arduino precompiled IDF libraries. You may need to use Arduino as IDF component and modify the sdkconfig in order to allow reading efuses.
Another possible way would be by creating an IDF project directly.

For more information:
https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/system/efuse.html

In the IDF example from
https://github.com/espressif/esp-idf/blob/master/examples/system/efuse/README.md
I see that the sdkconfig.default has those settings enabled, which is not the case in Arduino Core.

CONFIG_EFUSE_CUSTOM_TABLE=y
CONFIG_EFUSE_VIRTUAL=y

[Endorfin35]

I made the following additions to the sdkconfig file.

CONFIG_EFUSE_CUSTOM_TABLE=y
CONFIG_EFUSE_VIRTUAL=y

But, There was no change...
I can read efuse records. For example, I can read data such as MAC address without any problems. It seems possible to write. But there is a problem with the commit process. If you have any other advice, I want to hear it.

I completed my project with Arduino framework. I have no IDF experience. This is the last option for me. So I want to try the possibilities. In the link below, it is mentioned that the OPTIONAL_UNIQUE_ID efuse record is used by rainmaker. Can I write Efuse indirectly with Arduino? All I need is just one recording.

Thanks.

espressif/esp-idf#8819

[SuGlider]

Each eFuse is a one-bit field which can be programmed to 1 after which it cannot be reverted back to 0.
Therefore, if it went out from the manufacturer already written, it can't be changed anymore, except by turning it into 1, which can potentially brick the chip.

espressif/esp-idf#8819 (comment)

[Endorfin35]

Thank you for your help.

I will use the Flash section.