AN3307 datasheet(29/37 Pages) STMICROELECTRONICS

Part #	AN3307

Description	Guidelines for obtaining IEC 60335 Class B certification for any STM32 application

PDF	37 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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29 / 37 page

AN3307

Class B solution structure

Doc ID 18186 Rev 4

29/37

5.3

Periodic runtime self-test initialization

Assuming that the startup self-tests passed sucessfully and standard initialization has been

done, then the runtime self-tests package must be initialized just before the program enters

the main loop performing regular calling of the runtime self-tests (refer to Figure 5). The

timing should be set properly to ensure the procedures of the runtime tests are called at the

necessary intervals.

At first all class B variables are initialized. Zero and its complement value are stored into

every class B variable complementary pair. The magic pattern is then stored at the top of the

space separated for the stack. Timer peripherals are configured for the tick interval

measurement and master clock frequency measurement. The same method as the startup

test is used.

Figure 14.

Periodic runtime self-test initialization structure

MS18900V1

Class B variables init

Write pattern on stack boundaries

Main time base init (SysTick )

AN3307 Datasheet(PDF) 29 Page - STMicroelectronics