Part Number: AM263P4-Q1
Other Parts Discussed in Thread: AM263P4, SYSCONFIG
Hi TI Experts,
I am currently working with the AM263P4 Control Card (PROC159E2) and implementing Watchdog Timer 0 (WDT0) for my application.
Initially, I tested the reference example from the MCU+ SDK with the default configuration (WDT set to 3 seconds), and it worked successfully. However, my application requires a longer Watchdog expiry timeout of around 15 to 20 seconds.
To achieve this, I modified the WDT configurations in SysConfig as follows:
- WDT Input Clock Source: XTACLK
- Clock Divider: Div /15 (resulting in 1.667 MHz input to WDT0)
- WDR Expiry Timeout (ms): 15000
The project builds successfully without any errors. However, during runtime, the program hangs inside the driver initialization sequence:
Drivers_open() -> Drivers_watchdogOpen() -> Watchdog_open() -> Watchdog_setWindowSize().Specifically, the execution gets stuck at the
HW_WR_FIELD32 macro within the following SDK function:void Watchdog_setWindowSize(Watchdog_Handle handle, uint32_t dwwdWindowSize)
{
Watchdog_Config* ptrWatchdogConfig;
Watchdog_HwAttrs* ptrHwCfg;
ptrWatchdogConfig = (Watchdog_Config*)handle;
ptrHwCfg = (Watchdog_HwAttrs*)ptrWatchdogConfig->hwAttrs;
HW_WR_FIELD32(ptrHwCfg->baseAddr + CSL_RTI_RTIWWDSIZECTRL,
CSL_RTI_RTIWWDSIZECTRL_WWDSIZE,
dwwdWindowSize);
}
Immediately after this register write operation, a Data Abort Exception is triggered, and the CPU traps into
HwiP_user_data_abort_handler_c.I have attached the screenshot of the CCS expressions window showing the exception context register values (
dfsr, adfsr, DFAR, LR, SPSR) which helped me trace the issue back to this register write.
I have reviewed the WDT0 register definitions in the Technical Reference Manual (TRM) but have not yet found the root cause of why writing to
RTIWWDSIZECTRL triggers a Data Abort under these clock settings.Could you please guide me on how to properly configure the AM263P Watchdog to achieve a 15-20 seconds timeout without triggering a memory fault?
Thank you in advance for your support!
