pcnt_chan_config_t::::io_loop_back field

For debug/test, the signal output from the GPIO will be fed to the input path as well. Note that this flag is deprecated, will be removed in IDF v6.0. Instead, you can configure the output mode by calling gpio_config() first, and then do PCNT channel configuration. Necessary configurations for the IO to be used as the PCNT input will be appended.