Constant esp_idf_sys::pcnt_unit_zero_cross_mode_t_PCNT_UNIT_ZERO_CROSS_NEG_POS

source ยท 
pub const pcnt_unit_zero_cross_mode_t_PCNT_UNIT_ZERO_CROSS_NEG_POS: pcnt_unit_zero_cross_mode_t = 2;
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< start from negative value, end to positive value, i.e. -N->+M