The Class B Library provides APIs to perform self-tests for the on-board systems of the microcontroller.
Terms and Acronyms
| Acronym | Description |
|---|---|
| API | Application Programming Interface. |
| AAPCS | The Procedure Call Standard for the ARM Architecture. |
| Driver | Driver is a software which depends on a lower software layer and abstract hardware and Real Time Operating System (RTOS) details for the middleware and applications. |
| MHC | MPLAB® Harmony Configurator. |
| MHCM | MPLAB® Harmony 3 Content Manager tool. |
| PC | Program Counter |
| PLIB | Peripheral Library in Harmony 3. A peripheral library contains simple functions to initialize and control peripherals and basic device features. |
| RST | Run-time Self-test. |
| RSTC | Reset Controller peripheral on the microcontroller. |
| RTC | Real Time Counter peripheral on the microcontroller. |
| SST | Startup Self-test. |
| Startup Code | The code which runs right after the microcontroller comes out of reset. It contains initialization code for global/static variables and any other basic routines which need to be run before the main() function is called. |
| SysTick | System Timer inside the ARM© Cortex M4F core. |
| WDT | Watchdog Timer. |
Features Tested by the Class B Library
Following table shows the components tested by the Class B library.
| Component | Reference (Table H1 of IEC 60730-1) | Fault/Error | Acceptable Measures |
|---|---|---|---|
| CPU Registers | 1.1 | Stuck-at | Static memory test |
| CPU Program Counter | 1.3 | Stuck-at | Static memory test |
| Interrupts | 2 | No interrupt / too frequent interrupt | Functional test |
| CPU Clock | 3 | Wrong frequency | Frequency monitoring |
| Flash | 4.1 | All single bit faults | Modified checksum |
| SRAM | 4.2 | DC fault | Static memory test |
| SRAM data path | 5.1 | Stuck-at | Static memory test |
| SRAM data path | 5.2 | Wrong address | Static memory test |
| Digital I/O | 7.1 | Abnormal operation | Input comparison or output verification |