On 4/15/21 2:40 AM, 王擎 wrote: > > Yes, as mentioned before, the behavior of WDT_MODE_IRQ_EN is use irq instead of > reset, so we must use WDT_MODE_IRQ_EN | WDT_MODE_DUAL_EN if like you said > "the first time generating an interrupt and the second time resetting the system" . > > The Dual mode is mentioned in the MTK datasheet: > In this mode, the watchdog will be AUTO-RESTART after interrupt is triggered. > AP need to clear WDT_STA after receiving interrupt from TOPRGU, or system reset > will be triggered after watchdog timer expires. > Instructions for use： > Set wdt_en = 1'b1. > Set dual_mode = 1'b1. > Set wdt_irq = 1'b1. > > We can use Dual mode to achieve pretimeout behavior, only in this way can we > get more information during pretimeout processing, instead of directly resetting. > If so, the pretimeout would always be half of the full timeout, and the timeout to configure would be timeout / 2. The code would have to adjust the pretimeout time accordingly. Also, to avoid unexpected and changed behavior, the prefimeout should by default be disabled. Guenter
