Does the IDE show errors when attempting to upload a new sketch?
Does your esp32 have two push buttons?

As noted above; #define ICMP_IRQ 15 is in the ..\espressif\esp32\tools\sdk\include\lwip\lwip\icmp.h [/i] but i can't seem to find any code that reacts to the ICMP_IRQ or even attach the IRQ. If I send a PING to the esp32 it responds so clearly the IRQ is processed somewhere. Is there any way to mon...

Caution: the code listed above has a bug, it writes beyond the end of the array.

I’d be curious to see the expression. Type conversion/promotion/coercion is handled in the compiler.

Seriously??? Save example: #include <Arduino.h> #include <EEPROM.h> // I'm just guessing EEPROM SIZE here #define EEPROM_SIZE 1024 typedef struct foo { char a[16]; char b[16]; } FOO; FOO foo; void setup() { Serial.begin(115200); delay(1000); Serial.println(""); EEPROM.begin(EEPROM_SIZE); // put some...

So, it appears to be a bug in SDK or Arduino core, introduced in newer code than I have installed.

I can’t tell what you are doing incorrectly from the partial code you include here.

What you should do is write a test program to learn how to save and restore using EEPROM. If you can’t make it work, provide the complete code here, maybe somebody will debug it.

Unless you have good reason, and understand the implications, you should stay away from packed structs.

Esp32 EEPROM is in flash. So is SPIFFS. SPIFFS moves writes around to level the wear, EEPROM library doesn’t.

SD has the same problem with wear, and the same solution: wear leveling. Same thing applies to SSD.

It’s been a while since I installed the esp32 Arduino core, I don’t know how to check the version.