AN3077 datasheet(24/82 Pages) STMICROELECTRONICS

24 / 82 page

Functional safety requirements for application software

AN3077

24/82

DocID16384 Rev 10

Figure 3. Double encoder read input

3.13.3.1.3

Software test implementation

●

ETIMER0_SWTEST_REGCRC

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

This computed checksum is compared to the expected value.

●

ETIMER1_SWTEST_REGCRC

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

This computed checksum is compared to the expected value.

●

SIUL_SWTEST_REGCRC

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

This computed 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.

●

ENCI_SWTEST_CMP

This software test is used to execute the comparison between the double reads

performed by one of the following:

–

one channel on eTimer_0 and one channel on eTimer_1

–

one channel on eTimer_1 and one channel on the SIUL

–

one channel on eTimer_0 and one channel on the SIUL

–

two channels on the SIUL

The comparison must take into account possible approximation because of different

captured values of the input asynchronous signals and the execution of interrupt based

event reads. Approximation required by different behavior of the encoded inputs must

be handled at the application level.

eTimer_0

ETC[x]

eTimer_1

ETC[y]

Encoder Input Double

Read Configuration

SIUL

EIRQ[x]

EIRQ[y]

= Input Pad

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