RTC calibration
Posted: Fri May 24, 2024 9:26 pm
Hi everyone,
I am working on a project that involves taking time measurements and requires high accuracy. To achieve this, I am using a GNSS receiver with a 1PPS signal to trigger an interruption and synchronize the internal time every second. Estimated CPU frequency is about 239.99886 MHz.
However, I've observed that my ESP32 drifts at a rate of 5 ppm every second. I measured this drift using the values.
Is there a way to calibrate the internal clock through code to correct this drift using the 1PPS signal as a reference? If so, is there any documentation available on this?
Thank you in advance for your help!
Regards,
Germán
I am working on a project that involves taking time measurements and requires high accuracy. To achieve this, I am using a GNSS receiver with a 1PPS signal to trigger an interruption and synchronize the internal time every second. Estimated CPU frequency is about 239.99886 MHz.
However, I've observed that my ESP32 drifts at a rate of 5 ppm every second. I measured this drift using the
Code: Select all
portGET_RUN_TIME_COUNTER_VALUEIs there a way to calibrate the internal clock through code to correct this drift using the 1PPS signal as a reference? If so, is there any documentation available on this?
Thank you in advance for your help!
Regards,
Germán