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3 PIC16 Diagnostic Test APIs
3.10 SW_SRAM_MARCH_TEST_01 - MarchB
This module contains functional safety diagnostics API for SRAM March-B.
3.10.1 Functions
3.10.1.2 DIAG_SRAM_MarchB
Software Requirement Reference ID : SW_SRAM_MARCH_TEST_01.

Introduction
This document contains API documentation for the diagnostic tests included in the MPLAB® Code Configurator PIC16/18 ISO26262 Diagnostic Library.
1 Software Requirements: PIC16
2 Software Requirements: PIC18
3 PIC16 Diagnostic Test APIs
- 3.1 SW_CPU_REGISTER_RESET_STATE_CHECK_01
  This module contains functional safety diagnostics APIs for CPU Registers.
- 3.2 SW_CLOCK_PERIODIC_MONITOR_01
  Software Requirement ID: SW_CLOCK_PERIODIC_MONITOR_01 This module contains APIs to calculate and validate the frequency of the CPU clock using a reference Secondary Oscillator Crystal. It verifies the reliability of the system clock (i.e., the system clock should be neither too fast nor too slow)
- 3.3 SW_CLOCK_PERIODIC_MONITOR_02
  Software Requirement ID: SW_CLOCK_PERIODIC_MONITOR_02. This module contains APIs to calculate, store and validate the frequency of the CPU clock using a reference line frequency.
- 3.4 SW_CPU_REGISTER_TEST_01
  This module contains functional safety diagnostics APIs for CPU Registers.
- 3.5 SW_EEPROM_MEMORY_CHECKSUM_CRC_TEST_01 - CRC16
  This module contains APIs to calculate, store and validate 16-bit CCITT CRC for a given EEPROM region.
- 3.6 SW_EEPROM_MEMORY_CHECKSUM_CRC_TEST_01 - CRC32
  This module contains APIs to calculate, store and validate 32-bit CCITT CRC for a given EEPROM region.
- 3.7 SW_FLASH_MEMORY_CHECKSUM_CRC_TEST_01 - CRC16
  This module contains APIs to calculate, store and validate 16-bit CCITT CRC for a given FLASH region.
- 3.8 SW_FLASH_MEMORY_CHECKSUM_CRC_TEST_01 - CRC32
  This module contains APIs to calculate, store and validate 32-bit CCITT CRC for a given FLASH region.
- 3.9 SW_INTERRUPT_FREQUENCY_TEST_01
  This module contains functional safety diagnostics API for SW_INTERRUPT_FREQUENCY_TEST_01.
- 3.10 SW_SRAM_MARCH_TEST_01 - MarchB
  This module contains functional safety diagnostics API for SRAM March-B.
  - 3.10.1 Functions
    - 3.10.1.1 MarchB_Global
      This function runs the March B algorithm on the 7 RAM addresses used to run the rest of the March B test.
    - 3.10.1.2 DIAG_SRAM_MarchB
      Software Requirement Reference ID : SW_SRAM_MARCH_TEST_01.
- 3.11 SW_SRAM_MARCH_TEST_01 - MarchC
  This module contains functional safety diagnostics APIs for SRAM March-C.
- 3.12 SW_SRAM_MARCH_TEST_01 - MarchC_Minus
  This module contains functional safety diagnostics APIs for SRAM March-C Minus.
- 3.13 SW_WATCHDOG_SIMPLE_TIMER_STARTUP_TEST_01
  This module contains functional safety diagnostics APIs for WatchDog Timer Test.
- 3.14 SW_WATCHDOG_WINDOWED_TIMER_STARTUP_TEST_01
  This module contains functional safety diagnostics APIs for WatchDog Timer Test.
- 3.15 File List
  Here is a list of all documented files with brief descriptions
- 3.16 Class List
  Here is a list of all documented files with brief descriptions
4 PIC18 Diagnostic Test APIs

3.10.1.2 DIAG_SRAM_MarchB

Software Requirement Reference ID : SW_SRAM_MARCH_TEST_01.

This file contains the implementation of the March B test on the SRAM. It is a complete and irredundant test capable of detecting stuck-at faults, addressing faults, transition faults, and coupling faults. This test is of complexity 17n (Where n is the number of bits). Since this test is a destructive test, DIAG_MarchBufferAddress is used to save and restore user memory during the test. This API supports only Bank-wise implementation. This means that the test length should be less than or equal to the end address of a given bank.

diag_sram_status_t DIAG_SRAM_MarchB(
    uint16_t startAddress,    uint8_t length,    uint16_t bufferAddress
)

Parameters


[in] startAddress	uint16_t - pointer to an array declared in user memory for test
[in] length	uint8_t - number of bytes to test
[in] bufferAddress	uint16_t - pointer to location in memory where array will be stored during test

Returns


diag_sram_status_t	SRAM_OK= 0 - Success, SRAM_ERROR= 1 - Failure, SRAM_GLOBAL_ERROR= 2 - Failure at test variables, SRAM_ADDR_ERROR= 3 - Invalid address, SRAM_LENGTH_ERROR= 4 - Invalid length