CCS-COMM_BOARD/F28335/DSP2833x_Adc.c

// TI File $Revision: /main/5 $
// Checkin $Date: October 23, 2007   13:34:09 $
//###########################################################################
//
// FILE:	DSP2833x_Adc.c
//
// TITLE:	DSP2833x ADC Initialization & Support Functions.
//
//###########################################################################
// $TI Release: 2833x/2823x Header Files V1.32 $
// $Release Date: June 28, 2010 $
// $Copyright:
// Copyright (C) 2009-2024 Texas Instruments Incorporated - http://www.ti.com/
//
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//###########################################################################

//
// Included Files
//
#include "DSP2833x_Device.h"     // DSP2833x Headerfile Include File
#include "DSP2833x_Examples.h"   // DSP2833x Examples Include File

//
// Defines
//
#define ADC_usDELAY  5000L

//
// InitAdc - This function initializes ADC to a known state.
//
void 
InitAdc(void)
{
    extern void DSP28x_usDelay(Uint32 Count);

    //
    //                          *IMPORTANT*
    // The ADC_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;
    ADC_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 DSP2833x_Examples.h file must
    // contain the correct CPU clock period in nanoseconds.
    //
    AdcRegs.ADCTRL3.all = 0x00E0;  // Power up bandgap/reference/ADC circuits
    DELAY_US(ADC_usDELAY);         // Delay before converting ADC channels
}

//
// End of file
//