CPU frequency under 80Mhz

[AyubowanPro]

Hello,

I would like to set the CPU frequency of my ESP32 custom board under 80Mhz for lowering power consumption. I'm using the PlatformIO IDE with Arduino framework.

I tried the setCpuFrequencyMhz() function but getCpuFrequencyMhz() always returns 240Mhz whatever I set with setCpuFrequencyMhz().
But by using board_build.f_cpu = 80000000L, it is working. However, the board crashes with board_build.f_cpu = 40000000L (40Mhz). Is there a way to lower the frequency under 80Mhz ?

Have a nice day

[chegewara]

But by using board_build.f_cpu = 80000000L, it is working. However, the board crashes with board_build.f_cpu = 40000000L (40Mhz). Is there a way to lower the frequency under 80Mhz ?

Have a nice day

Is your code using wifi or bt/ble? Because in this case 80MHz is minimum you can go.