MPC5744P: FLASH EEPROM Write Causes Watchdog Reset

[hunanpuxi]

hi~!

The EEPROM emulation area in FLASH of MPC5744P is defined as 0x00800000 to 0x0080FFFF.

One controller suddenly fails to write data here, though the same firmware works normally on other devices.

The controller resets immediately once a write operation is performed, and the reset cause is watchdog timeout.

What are the possible root causes and troubleshooting steps?

[petervlna]

Hello,

What are the possible root causes and troubleshooting steps?

As you already express it is watchdog timeout.

You can confirm this in RGM [DES/DFES] registers where the reset reasons are logged.

Since this is present only on one device, you must reach your SW corner case where the watchdog just expire. Disable the SWT and try to execute it again to see if the SW will get stuck.

Alternatively do it in debug mode, where debugger disable the SWT by default.

Simply some application routine is blocking execution of watchdog refresh routine and watchdog do not refresh in time. On top of that, you can use on SWT interrupt on first timeout, to see where the code is stuck and what is the reason SWT routine is not called.

Best regards,

Peter