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31 lines
1.2 KiB
Plaintext
31 lines
1.2 KiB
Plaintext
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choice XTAL_FREQ
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prompt "Main XTAL frequency"
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default XTAL_FREQ_40
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help
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This option selects the operating frequency of the XTAL (crystal) clock used to drive the ESP target.
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The selected value MUST reflect the frequency of the given hardware.
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Note: On ESP32, the XTAL_FREQ_AUTO option allows the ESP target to automatically estimating XTAL clock's
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operating frequency. The ESP32 uses the internal 8MHZ as a reference when estimating. Due to the internal
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oscillator's frequency being temperature dependent, usage of the XTAL_FREQ_AUTO is not recommended in
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applications that operate in high ambient temperatures or use high-temperature qualified chips and modules.
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config XTAL_FREQ_26
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bool "26 MHz"
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config XTAL_FREQ_32
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bool "32 MHz"
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config XTAL_FREQ_40
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bool "40 MHz"
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config XTAL_FREQ_AUTO
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bool "Autodetect"
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endchoice
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# soc_xtal_freq_t enum in soc/clk_tree_defs.h lists the XTAL frequencies can be supported
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# SOC_XTAL_SUPPORT_XXX in soc_caps.h lists the XTAL frequencies already supported
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config XTAL_FREQ
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int
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default 26 if XTAL_FREQ_26
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default 32 if XTAL_FREQ_32
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default 40 if XTAL_FREQ_40
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default 0 if XTAL_FREQ_AUTO
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