ESP8266 Community Forum

Posted: **Tue Mar 29, 2016 2:02 pm**

HI,

I am trying to save and access values in the RTC memory during DEEP sleep. Here is the sketch:

#include <ESP8266WiFi.h>

const unsigned long SLEEP_INTERVAL = 20 * 1000 * 1000; // 20 sec

extern "C" {
  #include "user_interface.h"
}

void setup() {
  Serial.begin(74880); 
  Serial.println();

  Serial.println("RTC Memory Test");
  
  byte rtcStore[2];
  system_rtc_mem_read(64, rtcStore, 2); 
  
  Serial.print("current value = ");
  Serial.println(*rtcStore);


  (*rtcStore)++;
  Serial.print("new value = ");
  Serial.println(*rtcStore);
  
  system_rtc_mem_write(64, rtcStore, 2);
  
  //sleep modes:  WAKE_RF_DEFAULT, WAKE_RFCAL, WAKE_NO_RFCAL, WAKE_RF_DISABLED
  ESP.deepSleep(SLEEP_INTERVAL - micros(), WAKE_RF_DISABLED); 

  delay(1000); 
}

void loop() {
   // should never get here 
}

But it is not working. In the Serial output I am getting:

Code: Select all

ets Jan  8 2013,rst cause:2, boot mode:(3,6)

load 0x4010f000, len 1264, room 16 
tail 0
chksum 0x42
csum 0x42
~ld

RTC Memory Test
current value = 0
new value = 1

 ets Jan  8 2013,rst cause:2, boot mode:(3,6)

load 0x4010f000, len 1264, room 16 
tail 0
chksum 0x42
csum 0x42
~ld

RTC Memory Test
current value = 0
new value = 1

I am using Arduino 1.6.8. Do I need to flash ESP-12 with some specific firmware (isn′t arduino uploading all that is needed) ?

Thanx,
DiNo

Posted: **Tue Mar 29, 2016 2:13 pm**

The Word address 64 is currently/mistakenly used by eboot (it should be fixed in next 2.2.0), so it is overwritten to zero at each reboot.

In the mean time, you can use other location staring at Word 65, but beware that word 95 is also used overwritten.

Posted: **Tue Mar 29, 2016 2:42 pm**

Thank you it works fine now !

Code: Select all

 ets Jan  8 2013,rst cause:2, boot mode:(3,6)

load 0x4010f000, len 1264, room 16 
tail 0
chksum 0x42
csum 0x42
~ld

RTC Memory Test
current value = 111
new value = 112

 ets Jan  8 2013,rst cause:2, boot mode:(3,6)

load 0x4010f000, len 1264, room 16 
tail 0
chksum 0x42
csum 0x42
~ld

RTC Memory Test
current value = 112
new value = 113

Posted: **Wed Jul 06, 2016 11:18 am**

I used the below code

```
Serial.println("RTC Memory Test");

byte rtcStore[2];
system_rtc_mem_read(65, rtcStore, 2);

Serial.print("current value = ");
Serial.println(*rtcStore);

(*rtcStore)++;
Serial.print("new value = ");
Serial.println(*rtcStore);

system_rtc_mem_write(65, rtcStore, 2);

//sleep modes: WAKE_RF_DEFAULT, WAKE_RFCAL, WAKE_NO_RFCAL, WAKE_RF_DISABLED
ESP.deepSleep(30*1000000, WAKE_RF_DISABLED);

delay(1000);
```

But I am not getting incremental data as mentioned by last post.

output:
RTC Memory Test
current value = 239
new value = 240

RTC Memory Test
current value = 239
new value = 240

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