TMS320F28035: I inherited asm code for the CLA1 to read the ADC in the background

// TI File $Revision: /main/2 $
// Checkin $Date: February 20, 2009   15:37:05 $
//###########################################################################
//
// FILE:	DSP2803x_Adc.c
//
// TITLE:	DSP2803x ADC Initialization & Support Functions.
//
//###########################################################################
// $TI Release: DSP2803x C/C++ Header Files V1.10 $
// $Release Date: July 27, 2009 $
//###########################################################################

#include "DSP2803x_Device.h"     // DSP2803x Headerfile Include File
#include "DSP2803x_Examples.h"   // DSP2803x Examples Include File

#define ADC_usDELAY  1000L

//---------------------------------------------------------------------------
// InitAdc:
//---------------------------------------------------------------------------
// This function initializes ADC to a known state.
//
// NOTE: ADC INIT IS DIFFERENT ON 2803x DEVICES COMPARED TO OTHER 28X DEVICES
//
void InitAdc(void)
{


    // *IMPORTANT*
	// The Device_cal function, which copies the ADC calibration values from TI reserved
	// OTP into the ADCREFSEL and ADCOFFTRIM registers, occurs automatically in the
	// Boot ROM. If the boot ROM code is bypassed during the debug process, the
	// following function MUST be called for the ADC to function according
	// to specification. The clocks to the ADC MUST be enabled before calling this
	// function.
	// See the device data manual and/or the ADC Reference
	// Manual for more information.

	    EALLOW;
		SysCtrlRegs.PCLKCR0.bit.ADCENCLK = 1;
		(*Device_cal)();
		EDIS;

    // To powerup the ADC the ADCENCLK bit should be set first to enable
    // clocks, followed by powering up the bandgap, reference circuitry, and ADC core.
    // Before the first conversion is performed a 5ms delay must be observed
	// after power up to give all analog circuits time to power up and settle

    // Please note that for the delay function below to operate correctly the
	// CPU_RATE define statement in the DSP2803x_Examples.h file must
	// contain the correct CPU clock period in nanoseconds.
	EALLOW;
	AdcRegs.ADCCTL1.bit.ADCBGPWD  = 1;		// Power ADC BG
	AdcRegs.ADCCTL1.bit.ADCREFPWD = 1;		// Power reference
	AdcRegs.ADCCTL1.bit.ADCPWDN   = 1;		// Power ADC
	AdcRegs.ADCCTL1.bit.ADCENABLE = 1;		// Enable ADC
	AdcRegs.ADCCTL1.bit.ADCREFSEL = 0;		// Select internal BG
	EDIS;

    DELAY_US(ADC_usDELAY);         // Delay before converting ADC channels
}

void InitAdcAio()
{

   EALLOW;

/* Configure ADC pins using AIO regs*/
// This specifies which of the possible AIO pins will be Analog input pins.
// NOTE: AIO1,3,5,7-9,11,13,15 are analog inputs in all AIOMUX1 configurations.
// Comment out other unwanted lines.

    GpioCtrlRegs.AIOMUX1.bit.AIO2 = 2;    // Configure AIO2 for A2 (analog input) operation
    GpioCtrlRegs.AIOMUX1.bit.AIO4 = 2;    // Configure AIO4 for A4 (analog input) operation
    GpioCtrlRegs.AIOMUX1.bit.AIO6 = 2;    // Configure AIO6 for A6 (analog input) operation
    GpioCtrlRegs.AIOMUX1.bit.AIO10 = 2;   // Configure AIO10 for B2 (analog input) operation
    GpioCtrlRegs.AIOMUX1.bit.AIO12 = 2;   // Configure AIO12 for B4 (analog input) operation
    GpioCtrlRegs.AIOMUX1.bit.AIO14 = 2;   // Configure AIO14 for B6 (analog input) operation
    EDIS;
}