I am using EEPROM of ESP8266 E-12. I am wondering what's the limit of it. I am using EEPROM.begin(1024); which is 1kb, I assume. Currently Arduino IDE shows:
Sketch uses 245897 bytes (56%) of program storage space. Maximum is 434160 bytes.
Global variables use 33936 bytes (41%) of dynamic memory, leaving 47984 bytes for local variables. Maximum is 81920 bytes.What does that exactly mean?
Max EEPROM size is
4096 bytes.
Alright. Thank you.
And what's exactly Arduino IDE saying. I couldn't complete understanding those terms.
And also, 1 character is considered as 1 byte right?
No problem. Yes 1 character is 1 byte.
Sketch size is the size of the compiled firmware on the Flash.
Global variables size if how much RAM is assigned to your global variables.
Your ESP should have a total of around 80KB of RAM.
Thank you, again.
So, to clarify myself, Dynamic memory is RAM.
But what about
So, to clarify myself, Dynamic memory is RAM.
But what about
program storage space? It's the ROM. (right?) So, whatever EEPROM I am using, is a part of ROM. Am I right? So, if I use all the 4096bytes of EEPROM, and also if I write big code in ROM, are those two memories gonna interfere with each other?? If so, how to prevent it?
no, they are completely unrelated
program storage space is on the flash. the firmware has a known start and end addresses. the eeprom is mapped to another memory space. so there will be no conflict.
even though the the EEPROM is not really an EEPROM chip, it is in another part of the flash chip (as @ikbelkirasan pointed out).
btw it's not a real eeprom. everything is on the flash. ESP uses an eeprom emulation.
yes exactly
btw it's not a real eeprom. everything is on the flash.
Yeah, this is why I had that doubt. Thank you guys. :)
Happy to help :)
:sparkles:
how much limit size of EEPROM, ESP 8226 with 4MB?
maybe 3MB offset ?¿ without spiff,and swap memory for OTA updates...
ok are 4096 bytes
for design
Hello
For
what's the datatype of
Rtc.SetDateTime(compiled);what's the datatype of
compiled? Is it timestamp?
where saw this method for RTC?
RTC class on esp8226 (write/read)
mainly
ESP.rtcUserMemoryWrite(offset, &data, sizeof(data)) and ESP.rtcUserMemoryRead(offset, &data, sizeof(data)) allow data to be stored in and retrieved from the RTC user memory of the chip respectively. Total size of RTC user memory is 512 bytes, so offset + sizeof(data) shouldn’t exceed 512. Data should be 4-byte aligned. The stored data can be retained between deep sleep cycles. However, the data might be lost after power cycling the chip.
but you refer RTC module
extern
look examples of https://github.com/Makuna/Rtc
compiled is intance of class
@CodingCreate101 // RtcDateTime compileDateTime(DATE, TIME);
RtcDateTime(const char date, const char time);
RtcDateTime(const char date, const char time);
Ohhh right.. how could I miss such obvious thing
hehe
Thank you
pair programming ?
haha