ST STM32L4 Series, User Manual

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Table 59. DMA2D_SM_2
SM CODE DMA2D_SM_2
Description DMA processing and interrupt awareness
Ownership End user
Detailed implementation
This method is based on system knowledge of frequency and type of DMA2D transaction
expected. In general, image processing systems are based on a deterministic timing for image
framing arrival and processing.
Therefore, this method requires to monitor the expected execution of image processing and,
in case interrupt generation is used, their correct timing and sequence.
Error reporting Depends on implementation
Fault detection time Depends on implementation
Addressed fault model Permanent/transient
Dependency on Device configuration None
Initialization Depends on implementation
Periodicity Continuous
Test for the diagnostic Not applicable
Multiple-fault protection CPU_SM_0: Periodic core self-test software
Recommendations and known limitations
Implementation of this method can be merged with the safety mechanism NVIC_SM_1:
Expected and unexpected interrupt check
Note: If image processing performed by DMA2D is used for the implementation of a safety function, system level
considerations (as consistency checks on objects recognition results) may guarantee additional diagnostic
coverage. Similarly, system level data redundancy schemes (as for instance algorithms based on processing for
sequences of multiple image frames) may result in a relevant de rating for transient failure rate.
3.6.13 Chrom-GRC™ (GFXMMU)
Table 60. GFX_SM_0
SM CODE GFX_SM_0
Description Periodic read-back of GFXMMU configuration registers
Ownership End user
Detailed implementation
This method must be applied to DSI Host configuration registers.
Detailed information on the implementation of this method can be found in
Section 3.6.14 Extended interrupt and events controller (EXTI) .
Error reporting Refer to NVIC_SM_0
Fault detection time Refer to NVIC_SM_0
Addressed fault model Refer to NVIC_SM_0
Dependency on Device configuration Refer to NVIC_SM_0
Initialization Refer to NVIC_SM_0
Periodicity Refer to NVIC_SM_0
Test for the diagnostic Refer to NVIC_SM_0
Multiple-fault protection Refer to NVIC_SM_0
Recommendations and known limitations Refer to NVIC_SM_0
UM2305
Hardware and software diagnostics
UM2305 - Rev 10
page 39/110