FS26 Perform RSTB path check

[liyongfeng]

RSTB assertion can be requested by SPI with the bit RSTB_REQ in FS_SAFE_IOS_1，then the  software reads the RSTB _ DIAG flag for judgment.

But after the MCU reset, how does the software identify the reset reason is power reset or RSTB_REQ?

Please help me give me a way to implement step4, thank you!

1. Close the initialization phase by sending the first good WD refresh.
2. Clear all the flags by writing in FS_DIAG_SAFETY1,FS_DIAG_SAFETY2,FS_OVUVREG_STATUS.

1. Clear the fault error counter to “0” with consecutive good WD refresh.
2. Perform RSTB path check (steps 1 to 4 must be redone after RSTB is released).
3. Release FS0B pin.
4. Perform FS0B safety path check.

[JozefKozon]

Dear 李 永锋,

please refer to the section 21.3.7 in the FS26 datasheet. If the INTB pin generates a pulse to the MCU, then the source of the RSTB asserted, is a fault. Not a requested by the MCU through the SPI interface. The Table 136. and Table 137. shows list of INTB sources.

With Best Regards,

Jozef