3.2.15 DIAG_MCLK

The DIAG_MCLK module is designed to verify the correct functionality of the Main Clock (MCLK) through a set of C function calls.

Note: This module contains routines which sets the main clock at 48 MHz. The user would need to call DIAG_OSCCTRL_Initialize to restore the clock.

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

Table 3-16.
Function	Diagnostic Mechanism	Use Case	Elapse Time (μs)~
DIAG_MCLK_ClockCalibration()	MCLK_CLOCK_CALIBRATION	POST	318.39
DIAG_MCLK_SFRReset()	SFR_RESET_STATE	POST	39.54
DIAG_MCLK_SFRWriteRead()	SFR_WRITE_READ	POST / OnDemand	33.52

Configuring the Diagnostic

DIAG_MCLK does not require additional configuration.

Run-time Pre-requisites

DIAG_MCLK_SFRRead should be executed before DIAG_MCLK_SFRWriteRead

Using the Diagnostic

#include "definitions.h"

DIAG_TEST_STATUS DIAG_MCLK_SFRPost(void)
{
    DIAG_TEST_STATUS result;
    
    result = DIAG_MCLK_SFRReset(NULL,0,false);
    if (result == DIAG_TEST_PASSED)
    {
        result = DIAG_MCLK_SFRWriteRead(NULL,0,false);
    }
    return result;
}

DIAG_TEST_STATUS DIAG_MCLK_Post(void)
{   
    // expected_mclk_freq should be in range of 48MHz, ex:(8000000)
    // Assuming Reference is at 48MHz
    return DIAG_MCLK_ClockCalibration(6000000);
}