Introduction
This document contains API documentation for the diagnostic tests included MPLAB® Code Configurator AVR® IEC60730 Class B Diagnostic Library.
1 Software Requirements
2 Clock Frequency Test
This module contains functional safety diagnostics APIs for Clock Frequency test.
3 CPU Program Counter
This module contains functional safety diagnostics APIs for CPU Program counter test.
4 CPU Registers
This module contains functional safety diagnostics APIs for CPU Registers.
5 EEPROM - 16-bit CRC
This module contains APIs to calculate, store and validate 16-bit CCITT CRC for a given EEPROM region.
6 EEPROM - 32-bit CRC
This module contains APIs to calculate, store and validate 32-bit CCITT CRC for a given EEPROM region.
7 FLASH - 16-bit CRC
This module contains APIs to calculate, store and validate 16-bit CCITT CRC for a given FLASH region.
8 FLASH - 32-bit CRC
This module contains APIs to calculate, store and validate 32-bit CCITT CRC for a given FLASH region.
9 Interrupt Frequency Test
This module contains functional safety diagnostics API for Interrupt Frequency Test.
10 SRAM - Checkerboard Algorithm
This module contains functional safety diagnostics APIs for SRAM Checkerboard Test.
11 SRAM - March C-Minus Algorithm
This module contains functional safety diagnostics APIs for SRAM March-C Minus.
12 Simple Watchdog Timer
This module contains functional safety diagnostics APIs for WatchDog Timer Test.
13 Windowed Watchdog Timer
This module contains functional safety diagnostics APIs for WatchDog Timer Test.
14 File List
Here is a list of all documented files with brief descriptions
15 Class List
Here is a list of all documented files with brief descriptions

1.4 EEPROM CRC

Test Name: EEPROM Memory Test.

Purpose of test: Detect all single bit faults in EEPROM memory.

Acceptable Measure (Annex. H): Modified checksum (H.2.19.3.1).

Description: A cyclic redundancy check (CRC) is an error detection technique used to find accidental errors in invariable memory. This method is commonly used to determine the correctness of data transmissions and data present in EEPROM memory. Test should compute a checksum of the data and store it. In order to detect errors, a new checksum is computed on the same data and compared with the previous one. If they are different, there is an error.

Two commonly used CRC standards are supported:
- 16-bit CRC CCITT
- 32-bit CRC
Two software implementations are supported:
- Lookup table: This uses a CRC look-up table to speed up the computations. The look-up table requires 512 (for 16-bit) or 1024 (for 32-bit) bytes of flash memory.
- Direct computation: This calculates the checksum for each byte using a polynomial division. This version occupies no space in the Flash memory but is slower than the lookup table method.

API Documentation: EEPROM - 16-bit CRC, EEPROM - 32-bit CRC