AN3077 datasheet(21/82 Pages) STMICROELECTRONICS

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AN3077

Functional safety requirements for application software

Mandatory: The software tests that the application must implement are:

●

ETIMER0_SWTEST_REGCRC

●

ETIMER1_SWTEST_REGCRC

●

SIUL_SWTEST_REGCRC

Note:

Rationale: To verify that the configuration of the modules used by this safety function

compare to the expected configuration

Mandatory: In addition, the double reads must be compared by the application with the

implementation of the following test: ETIMERI_SWTEST_CMP.

Note:

Rationale: To verify that the two sets of data compare

Figure 2. Double Read PWM Input

3.13.2.1.3

Software test implementation

●

ETIMER0_SWTEST_REGCRC

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

checksum is compared with the expected value.

●

ETIMER1_SWTEST_REGCRC

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

checksum is compared with the expected value.

●

SIUL_SWTEST_REGCRC

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

The checksum is compared with the expected value.

PWM In Double Read

Configuration

ETC[x]

ETC[y]

eTimer_0

eTimer_1

= Input Pad

AN3077 Datasheet(PDF) 21 Page - STMicroelectronics