3.2.9 DIAG_DSU

The DIAG_DSU module is designed to verify the correct functionality of the Device Service Unit (DSU) through a set of C function calls. DSU_CRCCalculate creates a checksum.

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

Table 3-10.
Function	Diagnostic Mechanism	Use Case	Elasped Timer (μs) ~
DIAG_DSU_CRCCalc()	DSU_CRC_CALCULATE	POST / OnDemand	5574
DIAG_DSU_CRCEnable()	DSU_CRC_ENABLE	POST / OnDemand	4388
DIAG_DSU_MBIST()	DSU_MBIST_READY	POST / OnDemand	6588
DIAG_DSU_SFRReset()	SFR_RESET_STATE	POST	88
DIAG_DSU_SFRWriteRead()	SFR_WRITE_READ	POST / OnDemand	95

Configuring the Diagnostic

DIAG_DSU requires no additional configuration.

Run-time Pre-requisites

PAC_PeripheralProtectSetup( PAC_PERIPHERAL_DSU, PAC_PROTECTION_CLEAR) before all functions

DIAG_DSU_CRCEnable should be executed before DIAG_DSU_CRCCalc

Using the Diagnostic

#include "definitions.h"

DIAG_TEST_STATUS DIAG_DSU_SFRPost( void )
{
    return DIAG_DSU_SFRReset(NULL, 0, false);
}

DIAG_TEST_STATUS DIAG_DSU_Post( void )
{
    DIAG_TEST_STATUS result;
    
    result = DIAG_DSU_CRCEnable();
    if (result == DIAG_TEST_PASSED)
    {
        result = DIAG_DSU_CRCCalc();
        if (result == DIAG_TEST_PASSED)
        {
            result = DIAG_DSU_MBISTReady();
        }
    }
    return result;
}

void DIAG_DSU_Post_Pre()
{
    // Check if all dependencies have been tested
    PAC_PeripheralProtectSetup(PAC_PERIPHERAL_DSU, PAC_PROTECTION_CLEAR);    
    
    uint32_t crc = FLASH_CRC_SEED;
    DSU_CRCCalculate(START_OF_FLASH, FLASH_SIZE, FLASH_CRC_SEED, (uint32_t *)&crc);     
}