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ADC with SYS/BIOS

Akhilesh Raju
Intellectual 285 points

Hi ,

I want to use my ADC with the SYS/BIOS for Tiva C. The program without SYS/BIOS works fine but when i modify it for use with SYS/BIOS it does not run. It shows no error during build.

To be more specific it runs into an infinite loop when executing the statements starting with "ADC"

void main()
{
SysCtlClockSet(SYSCTL_SYSDIV_1 |SYSCTL_USE_OSC | SYSCTL_XTAL_16MHZ | SYSCTL_OSC_MAIN);

SysCtlPeripheralEnable(ADC0_BASE);
SysCtlPeripheralEnable(GPIO_PORTE_BASE);
GPIOPinTypeADC(GPIO_PORTE_BASE,GPIO_PIN_3);
ADCSequenceDisable(ADC0_BASE,3);
ADCSequenceConfigure(ADC0_BASE,3,ADC_TRIGGER_PROCESSOR,0);

BIOS_start();
}

Kindly help

Thanks

  • 0
    TI__Guru**** 244510 points

    Hi Akhilesh,

    Can you check in the IDE what exactly it is looping in. You can single step to see how the CPU is executing the code? This information will be useful to figure out why.

    Regards

    Amit Ashara

  • 0 in reply to Amit Ashara
    Intellectual 285 points

    Hi Amit,

    As soon as i execute the statements starting with "ADC" it goes to the below code placed in exit.c

    static void loader_exit(void)
    {
    #if defined(EMBED_CIO_BP)
    __asm(" .global C$$EXITE");
    #if defined(__32bis__)
    __asm("C$$EXITE:.word 0xDEFED0FE");
    #else
    __asm(" .align 4");
    #if defined(__big_endian__)
    __asm("C$$EXITE:.half 0xDEFE");
    #else
    __asm("C$$EXITE:.half 0xD0FE");
    #endif /* __big_endian__ */
    #endif /* __32bis__ */

    #else /* !EMBED_CIO_BP */
    __asm(" .global C$$EXIT");
    __asm("C$$EXIT: nop");
    #endif
    }

    After this it goes to the below code to loop infinitely


    /****************************************************************************/
    /* ABORT - ABNORMAL PROGRAM TERMINATION. CURRENTLY JUST HALTS EXECUTION. */
    /****************************************************************************/
    void abort(void)
    {
    loader_exit();
    for (;;); /* SPINS FOREVER */
    }

    Thanks

  • 0 in reply to Akhilesh Raju
    TI__Guru**** 244510 points

    Hi Akhilesh,

    When it hits abort can you check the register at 0xE000ED28 and 0xE000ED38. The BIOS does not like something about the way ADC API is being called. Might want to check it on TIRTOS E2E forum as I have seen issues similar to the above.

    Regards

    Amit Ashara