Embedded Control Software & Techniques

Software

Encryption Libraries

Implement reliable security for embedded applications.

The encryption library features the symmetric key

encryption/decryption functions Advanced Encryption

Standard (AES) and Triple-Data Encryption Algorithm (Triple-

DES). These algorithms are also recommended by most

Internet Engineering Task Force (IETF), Federal Information

Processing Standards (FIPS) and IPSec standards.

(Application Note: AN1044)

File System for PIC18, PIC24, PIC32 MCUs

and dsPIC DSCs

Microchip’s memory disk drive file system interface library

brings the ability to transfer and share portable memory

devices between an embedded system and a personal

computer. Most SD cards, CF cards and MMCs MultiMedia

Cards, particularly those sized below 2 gigabytes (GB), use

the FAT16 standard. The FAT32 standard can be used to

address memory sized between 2 GB and 2 terabytes (TB).

This library with complimentary application note (AN1045)

provides a method to read and/or write to these storage

devices through a microcontroller. The data of these

storage devices can be read by a PC, and the data written

by a PC can be read by a microcontroller. Most operating

systems support the FAT16 and FAT32 file systems.

Cyclic Redundancy Check (CRC) Module

CRC is one of the most versatile error checking algorithm

used in various digital communication systems. This

application note illustrates how to use the hardware CRC

module on selected 16-bit MCUs and DSCs. Users can

program any user-defined generator polynomial into this

module for CRC computation. (AN1148)

PMBus Stack

Microchip’s PMBus stack implements the PMBus protocol

for dsPIC SMPS Digital Signal Controllers from “GS”

family and mid-range PIC microcontrollers from the

PIC16F88X family.

Methods

Emulating Data EEPROM for PIC18 and PIC24

MCUs, dsPIC DSCs and PIC32

For devices that do not have on-chip EEPROM, emulating

EEPROM with on-chip Flash memory my be an important

option. This application note presents an interface similar

to an internal data EEPROM, but uses available on-chip

Flash memory to improve endurance by a factor as high as

500. (Application Note: AN1095)

Achieving Higher ADC Resolution Using Oversampling

This application note describes oversampling as a method

to add additional bits of accuracy to the 12-bit ADC

conversion in a dsPIC DSC. (AN1152)

Bootloaders

Two App Notes exist to help customers develop UART-

based bootloaders for PIC24 MCU and dsPIC DSC

products. First, AN1094 describes a UART-based

bootloader with command line interface. Next, AN1157

focuses on the PIC24F family and also includes the

PIC24F Quick Programmer (P24QP) Windows-based

graphical programming interface (GUI).

VDE Certified Class B Safety Library

Microchip’s certified class B library contains routines

that detect the occurrence of faults in a single channel

CPU. These routines have been developed in accordance

with the IEC 60730 standard to support the Class B

certification process (AN1229).

www.microchip.com/16-bit