The Windowed Watchdog Timer (WWDT) generates reset after a programmable period, if not serviced within that period. This time-out boundary is configurable, and the windowed feature allows the start time boundary to be configurable. The WWDT can generate an Interrupt, if not serviced within window (Open Window) defined by start time and time-out boundary. Also the WWDT can generate an Interrupt if serviced outside Open Window (within Closed Window). Generation of Interrupt depends on the WWDT Reaction configuration. SDL supports configuration of the watchdog timers. It also supports notification of the error via ESM interrupt. Additionally, APIs for checking the status of the watchdog timer is provided.

Features Supported

The module provides the following functionality

Ability to to initialize the RTI -DWWD module
Ability to configure RTI -DWWD module
Ability to service an RTI instance
Ability to read Status of the configuration
Ability to read back static register

There are 7 RTI Modules in the device – 1 in the MCU domain and 5 in the Main domain and 1 in wakup domain.

Instances in MCU domain: 1) MCU_RTI0

Instances in Main domain: 1) RTI0 2) RTI1 3) RTI2 4) RTI3 5) RTI15

Instances in WKUP domain: 1) WKUP_RTI0

SysConfig Features

None

Features NOT Supported

None

Important Usage Guidelines

None

Example Usage

The following shows an example of SDL RTI API.

Include the below file to access the APIs

#include <sdl/sdl_rti.h>

Config an RTI Instance

SDL_RTI_configParms pConfig;
 
/* Configure RTI parameters for preload, window and reaction*/
pConfig.SDL_RTI_dwwdPreloadVal = RTIGetPreloadValue(RTI_CLOCK_SOURCE_200KHZ, RTI_WDT_TIMEOUT);
pConfig.SDL_RTI_dwwdWindowSize = RTI_DWWD_WINDOWSIZE_100_PERCENT;
pConfig.SDL_RTI_dwwdReaction   = RTI_DWWD_REACTION_GENERATE_NMI;
 
#if defined (M4F_CORE)
retVal = SDL_RTI_config(SDL_INSTANCE_MCU_RTI0_CFG, &pConfig);
#endif
#if defined (R5F_CORE)
retVal = SDL_RTI_config(SDL_INSTANCE_WKUP_RTI0, &pConfig);
#endif
 
if (retVal == SDL_EFAIL)
{
    UART_printf("Error during Window configuration.\n");
}

Verify the config

/* Verify the config */
#if defined (M4F_CORE)
retVal = SDL_RTI_verifyConfig(SDL_INSTANCE_MCU_RTI0_CFG, &pConfig);
#endif
#if defined (R5F_CORE)
retVal = SDL_RTI_verifyConfig(SDL_INSTANCE_WKUP_RTI0, &pConfig);
#endif
 
if (retVal == SDL_EFAIL)
{
    UART_printf("Error during Window Verify configuration.\n");
}

Read the static registers

SDL_RTI_staticRegs pStaticRegs;
 
#if defined (M4F_CORE)
retVal = SDL_RTI_readStaticRegs(SDL_INSTANCE_MCU_RTI0_CFG, &pStaticRegs);
#endif
#if defined (R5F_CORE)
retVal = SDL_RTI_readStaticRegs(SDL_INSTANCE_WKUP_RTI0, &pStaticRegs);
#endif

Start an RTI Instance

#if defined (M4F_CORE)
SDL_RTI_start(SDL_INSTANCE_MCU_RTI0_CFG);
#endif
#if defined (R5F_CORE)
SDL_RTI_start(SDL_INSTANCE_WKUP_RTI0);
#endif