yamt commented on issue #413: esp32-core: Fix BOARD_CLOCK_FREQUENCY
URL: https://github.com/apache/incubator-nuttx/pull/413#issuecomment-593887228
 
 
   @jerpelea 
   there seems to be multiple clock sources available for CPU clock.
   see esp32_technical_reference_manual_en.pdf 3.2.3 "CPU Clock"
   for 80MHz, "PLL" clock, which is 320MHz, is used.
   
https://github.com/espressif/esp-idf/blob/master/components/soc/src/esp32/rtc_clk.c#L581-L585

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