TMS570LS3137: Power Management Module (PMM) initialization and self test

Hi Hugh,

The HALCOGen generated sys_startup.c doesn't do PMM related selftest. Please refer to the example code in safety diagnostic library. The PSCON selftest is performed in its startup.c.

I downloaded the Hercules SafeTI Diagnostic Library (http://www.ti.com/tool/SAFETI_DIAG_LIB) and installed it to the default location (C:\ti\Hercules\SafeTI Diagnostic Library\2.4.0). Is this the example code to which you refer?

Hi Hugh,

Yes. The example does the PSCON diagnostic test and PSCON privilege mode access test.

PSCON diagnostic selftest in the example project includes:
1. self test using compare match and mismatch
2. error forcing self test
3. self test error forcing

Hugh,
There is also example in HalCoGen (Help->Examples->(mcu version)->example_SafetyLib.c).
But in this example, pmmInit() function is also not called...

Michal,

Thanks for bringing this to my attention. Unfortunately, this only increases my confusion concerning the necessity of invoking pmmInit() and the pmmTurnONxxxxPowerDomain() family of functions.

Hugh

Hi Hugh,

pmmInit() is to turn on the power domains which are on at default. The default mode of PSCON is lock step. Each power domain has two PSCONs (primary and secondary or diagnostic). All power management inputs to a power domain are controlled only by the primary PSCON. All power management outputs from the power domain are fed back to both the primary and the diagnostic PSCON. Two PSCONs are always in a lock-step operating mode. A dedicated compare unit checks the outputs of the two PSCON modules on every cycle.

If you want to do PSCON selft test, you need to switch the mode by writing MKEY to PTCKEYREG register: