3.2.28 DIAG_WDT

The DIAG_WDT module is designed to verify the correct functionality of the Watchdog (WDT) through a set of C function calls.

The DIAG_WDT software test API is mapped to the following safety mechanisms:

#define WDT_MAX_WAIT_LOOPS      0x10
#define NUM_OF_WDTs             1
    
typedef enum 
{
    DIAG_WDT_STATE_1,
    DIAG_WDT_STATE_2,
    DIAG_WDT_STATE_3,
    DIAG_WDT_STATE_4,
    DIAG_WDT_PASSED,
} DIAG_WDT_STATE;


typedef enum 
{
    DIAG_WDT_SS_PRE_RESET,
    DIAG_WDT_SS_POST_RESET,
    DIAG_WDT_SS_FAILED,
}DIAG_WDT_SS_STATES;

typedef enum 
{
    DIAG_WDT_WS_PRE_RESET,
    DIAG_WDT_WS_POST_TOO_EARLY,
    DIAG_WDT_WS_POST_TOO_LATE,
    DIAG_WDT_WS_FAILED,
}DIAG_WDT_WS_STATES;
    
typedef enum 
{
    DIAG_WDT_TD_PRE_RESET,
    DIAG_WDT_TD_POST_RESET,
    DIAG_WDT_TD_FAILED,
}DIAG_WDT_TD_STATES;

typedef enum diag_wdt_nums 
{
    DIAG_WDT_NUM = 0,
    DIAG_WDT_MAX
}DIAG_WDT_NUMBERS;

typedef enum diag_wdt_periphs 
{
    DIAG_WDT_PERIPH = 1<<DIAG_WDT_NUM,
}DIAG_WDT_PERIPHS;
    
#define DIAG_WDT_PERIPHS_CHECK_VALUE     DIAG_WDT_PERIPH

extern DIAG_WDT_SS_STATES __attribute__((section(".persist"))) wdt_ss_state;   // WDT simple startup states
extern DIAG_WDT_WS_STATES __attribute__((section(".persist"))) wdt_ws_state;   // WDT window startup states
extern DIAG_WDT_TD_STATES __attribute__((section(".persist"))) wdt_td_state;   // WDT tmr disable startup states
extern uint8_t __attribute__((section(".persist"))) wdt_state;                 // WDT states

Configuring the Diagnostic

DIAG_WDT does not require additional configuration.

Run-time Pre-requisites

DIAG_WDT_SFRRead should be executed before DIAG_WDT_SFRWriteRead

DIAG_WDT_SFRWriteRead should not be executed during OnDemand if the WDT peripheral is enabled.

DIAG_WDT_SimpleStartup should be executed in two passes to get a accurante result

Using the Diagnostic

The DIAG_WDT_SimpleStartup() API implements an internal state machine.

#include "definitions.h"

DIAG_TEST_STATUS DIAG_WDT_SFRPost( void )
{
    DIAG_TEST_STATUS result;
    
    result = DIAG_WDT_SFRReset(NULL,0,false);
    if( result == DIAG_TEST_PASSED )
    {   
        result = DIAG_WDT_SFRWriteRead(NULL,0,false);
    }

    return result;
}


DIAG_TEST_STATUS DIAG_WDT_Post( void )
{
    DIAG_TEST_STATUS result;
        
    // Check if all dependencies have been tested
    PAC_PeripheralProtectSetup(PAC_PERIPHERAL_WDT, PAC_PROTECTION_CLEAR);
    
    result = DIAG_WDT_SimpleStartup();    
    if (result == DIAG_TEST_PASSED)
    {
        result = DIAG_WDT_Interrupts();
    }

    WDT_Disable();
    PAC_PeripheralProtectSetup(PAC_PERIPHERAL_WDT, PAC_PROTECTION_SET);
    return result;
}