Function esp_idf_sys::ets_install_putc1

pub unsafe extern "C" fn ets_install_putc1(
    p: Option<unsafe extern "C" fn(c: c_char)>
)

@brief Ets_printf have two output functions： putc1 and putc2, both of which will be called if need ouput. To install putc1, which is defaulted installed as ets_write_char_uart in none silent boot mode, as NULL in silent mode.

@param void (*)(char) p: Output function to install.

@return None