Needing More Accurate Clock
Posted: Sun Aug 23, 2020 4:02 pm
Hello,
I am using W-ROVER to do data sampling.
I have been using esp_timer_get_time() as usecond local clock to generate timestamps. I have noticed that from module to module this source varies by about +-5%, which seems to be expected based on what I've seen in various forum posts. I need greater accuracy.
I have also read that the W_ROVER has an on board 8Mhz crystal with 10ppm accuracy which can accessed by software. That said, I have been unable to find documentation that describes how to configure this. If this crystal does exists and is accessible by software, I would like to use it!
If the W-ROVER does not in fact enable software access to a 10ppm clock, then I would like to run an external crystal with 10ppm accuracy. Again, I have not been able to find documentation on how to do this.
Guidance or a link to documentation that describes how to get a more accurate clock source would be very much appreciated.
Thank you.
Bill
I am using W-ROVER to do data sampling.
I have been using esp_timer_get_time() as usecond local clock to generate timestamps. I have noticed that from module to module this source varies by about +-5%, which seems to be expected based on what I've seen in various forum posts. I need greater accuracy.
I have also read that the W_ROVER has an on board 8Mhz crystal with 10ppm accuracy which can accessed by software. That said, I have been unable to find documentation that describes how to configure this. If this crystal does exists and is accessible by software, I would like to use it!
If the W-ROVER does not in fact enable software access to a 10ppm clock, then I would like to run an external crystal with 10ppm accuracy. Again, I have not been able to find documentation on how to do this.
Guidance or a link to documentation that describes how to get a more accurate clock source would be very much appreciated.
Thank you.
Bill