udoklein
Experimental ESP32 support using espressif arduino-esp32 core
Tested using the ESP-WROOM-32 module. This module uses a 40 MHz crystal oscillator (+/- 10 ppm). The hardware GPTimer is prescaled to tick at 1 MHz, and the 1 kHz generator is triggered by an interrupt every 1000 ticks.
Hi Zio Tibia, thanks for providing these changes. Are they still experimental or do you consider them production ready? Right now I have no means to verify if this works for ESP32 and or ESP8266.
I was able to run SperFilter, adjusting the GPIO declarations, but these are not included in this PR. I reached a synchronized state in approximately 550 seconds in a low-noise environment. I repeated this process over several days, and the result remained consistent.
Toggling an output pin each time the ISR occurs allows me to measure a precise frequency of 500.0 Hz with a 50% duty cycle, using a hobby-level oscilloscope.
Can you please issue a new pull request such that I can merge onto the new master? Sorry for being slow and lazy - right now I have very little time and lack the hardware setup for testing.
Hello @Anderl94 , I haven't had time yet to modify the pull request as per @udoklein 's instructions. If you want to do some testing, you can use the branch ziotibia81/dcf77@esp32-patch-1 in my repository .