AM3358: Watchdog control

I know TCR.TRB bit, set to 1 to reload 32 bit counter (TIM) with PRD and 8 bit pre-scalar (PSC) with TDD for TMS320F2837x. What should I do to reload timer for AM3358.? Thanks

Hi Anping,

I am not familiar with TMS320F2837x device, thus I can not advice for it.

Anping Chen said:

What should I do to reload timer for AM3358.?

The current timer value can be accessed on-the-fly by reading the watchdog timer counter register (WDT_WCRR), modified by accessing the watchdog timer load register (WDT_WLDR) (no on-the-fly update), or reloaded by following a specific reload sequence on the watchdog timer trigger register (WDT_WTGR).

After reset generation, the counter is automatically reloaded with the value stored in the watchdog load register (WDT_WLDR).

When a watchdog timer is enabled, software must periodically trigger a reload before the counter overflows. Hence, the value of the WDT_WLDR[31:0] bit field must be chosen according to the ongoing activity preceding the watchdog reload.

To reload the timer counter and reset the prescaler before reaching overflow, a reload command is executed by accessing the watchdog timer trigger register (WDT_WTGR) using a specific reload sequence. The specific reload sequence is performed whenever the written value on the WDT_WTGR register differs from its previous value. In this case, reload is executed in the same way as an overflow autoreload, but without the generation of a reset pulse. The timer counter is loaded with the value of the watchdog timer load register (the WDT_WLDR[31:0] TIMER_LOAD bit field), and the prescaler is reset.

For more details, refer to AM335x TRM, ch 20.4 WATCHDOG

Regards,
Pavel

Hi Pavel

     I am still confused. Can you provide a snapshot of code to stop the timer and reload timer for AM3358? The code for TMS320F2837x device is the following 

Hwi_disable();

/* Stop the timer */

Timer_stop(watchdog_timer);

Hwi_enable();

/* reload the timer */

// EALLOW;

// CpuTimer0Regs.TCR.bit.TRB = 1;

// EDIS;

Thanks