AN4266 datasheet(33/76 Pages) STMICROELECTRONICS

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AN4266

Functional safety requirements for application software

Doc ID 024283 Rev 2

33/76

Software test implementation

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SIUL_SWTEST_REGCRC

The SIUL configuration registers are read and a CRC checksum is computed. The

checksum is compared to the expected value.

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ETIMER0_SWTEST_REGCRC

The eTimer_0 configuration registers are read and a CRC checksum is computed. The

checksum is compared to the expected value.

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ETIMER1_SWTEST_REGCRC

The eTimer_1 configuration registers are read and a CRC checksum is computed. The

checksum is compared to the expected value.

●

FLEXPWM0_SWTEST_REGCRC

The FlexPWM_0 configuration registers are read and a CRC checksum is computed.

The checksum is compared to the expected value.

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FLEXPWM1_SWTEST_REGCRC

The FlexPWM_1 configuration registers are read and a CRC checksum is computed.

The checksum is compared to the expected value.

Note:

Implementation hint: The eDMA and CRC modules should be used to implement this SIF

to avoid overloading the CPU.

●

PWMRB_SWTEST_CMP

This procedure output compares the PWM read back provided by a single channel of

the eTimer_0 (eTimer_1) with the expected values that have been written to the

FlexPWM_1 (FlexPWM_0) output channel.

Implementation details

The following hardware elements shall be used for the safety function:

●

eTimer_0 channels

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eTimer_1 channels

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FlexPWM_0 channels

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FlexPWM_1 channels

Mandatory: The pads shall be configured via the appropriate pad configuration registers

(PCRn) in the SIUL module.

Note:

Rationale: To configure pads used by this safety function

AN4266 Datasheet(PDF) 33 Page - STMicroelectronics

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