CPU Freq Setting

[Natalie88]

Hardware:

Board: ESP32 Generic ?ESP32 Dev Module?
Core Installation/update date: 25/03/2018
IDE name: ?Arduino IDE?
Flash Frequency: ?80Mhz?
Upload Speed: ?115200?

Description:

I am calling rtc_clk_cpu_freq_set(RTC_CPU_FREQ_80M); in setup() just one time to adjust the cpu freq to 80Mhz . after deep sleep the frequency is back to 240? I thought the freq change will survive the deep sleep?
if I call the function each time the ESP wake up it hangs after several sleep periods, I think due to WDT reset as rtc_clk_cpu_freq_set consume a huge amount of time.
I have tried to yield() and put at delay(300) after the function call, it hang less but however it still hang sometimes.

Sketch:

//Change the code below by your sketch
#include <Arduino.h>
RTC_DATA_ATTR  bool freqIsChanged= false;
void setup() {
  if(! freqIsChanged){
    rtc_clk_cpu_freq_set(RTC_CPU_FREQ_80M);
    yield();
    RTCdata.freqIsChanged = true;  
  }
  Serial.begin(115200);
  Serial.println();
  Serial.println("Booted");
  Serial.flush();
  Serial.println(String(rtc_clk_cpu_freq_get()));
  Serial.flush();
// do stuff 

// Go to deep sleep
}

void loop() {
}

Debug Messages:

Enable Core debug level: Debug on tools menu of Arduino IDE, then put the serial output here 

[lbernstone]

If you want the speed fixed at 80MHz, I recommend you follow the instructions at #1142 or just download the file from https://github.com/lbernstone/arduino-esp32-80MHz. Changing the cpu speed is going to be rough on the arduino timers.

[Natalie88]

@lbernstone Thank you for your reply
I changed the mentioned file but I am still getting 3 when I call this function
rtc_clk_cpu_freq_get(), this means that the Freq is still 240Mhz

[lbernstone]

I just updated to the latest code and tested it. I get 1 for the frequency.

[beats0126]

@lbernstone the 80mhz file cannot use for v1.0.1-rc1
can u update it?

[lbernstone]

I don't update it for rc releases. See issue #1142 to compile it, if you wish.

[atanisoft]

@beats0126 direct link to the instructions: #1142 (comment)

[me-no-dev]

I think you should report this to the IDF team ;) They can actually do something about it and make it work :P

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

This stale issue has been automatically closed. Thank you for your contributions.