/utils [General utilities]

Description

Modules
	px_ascii.h : ASCII table
	ASCII table character encoding.
	px_btn.h : Digital button input
	This module debounces a digital button input and reports button events.
	px_crc16.h : 16-bit CRC calculator
	16-bit CRC (Cyclic Redundancy Check) calculator for checksums.
	px_crc32.h : 32-bit CRC calculator
	32-bit CRC (Cyclic Redundancy Check) calculator for checksums.
	px_crc8.h : 8-bit CRC calculator
	8-bit CRC (Cyclic Redundancy Check) calculator for checksums.
	px_dbg_ft.h : Debug Flow Trace module
	Log flow of a program to a RAM buffer for post mortem inspection.
	px_link_list.h : Linked List
	A double (forward and backward) linked list using pointers.
	px_log.h : Debug log module
	Output human readable debug info to a serial console.
	px_queue.h : A FIFO item queue
	A FIFO (First In First Out) queue of fixed sized items using zero based indexes.
	px_ring_buf.h : FIFO ring buffer
	A data structure that uses a single, fixed-size buffer as if it were connected end-to-end (circular).
	px_ring_buffer_tiny.h : Tiny, macro based, ring buffer implementation
	Tiny, macro based, ring buffer implementation.
	px_rtc_util.h : Software RTC and utility functions
	This module provides basic time, calender and alarm functionality.
	px_sbuf.h : Safe buffer string appending functions that avoid overflow
	Safe buffer string appending functions that avoid overflow.
	px_systmr.h : Polled software timers
	Non-blocking software timers that have to be polled to determine if they have expired.
	px_xtea.h : XTEA (eXtended Tiny Encryption Algorithm)
	Block cipher encryption/decryption algorithm.