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71 lines
2.3 KiB
C
71 lines
2.3 KiB
C
4 weeks ago
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//###########################################################################
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//
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// FILE: DSP2833x_Adc.c
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//
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// TITLE: DSP2833x ADC Initialization & Support Functions.
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//
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//###########################################################################
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// $TI Release: F2833x/F2823x Header Files and Peripheral Examples V142 $
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// $Release Date: November 1, 2016 $
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// $Copyright: Copyright (C) 2007-2016 Texas Instruments Incorporated -
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// http://www.ti.com/ ALL RIGHTS RESERVED $
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//###########################################################################
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//
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// Included Files
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//
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#include "F28335/DSP2833x_Device.h" // DSP2833x Headerfile Include File
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#include "F28335/DSP2833x_Examples.h" // DSP2833x Examples Include File
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//
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// Defines
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//
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#define ADC_usDELAY 5000L
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//
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// InitAdc - This function initializes ADC to a known state.
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//
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void
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InitAdc(void)
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{
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//extern void DSP28x_usDelay(Uint32 Count);
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extern void DelayUs(Uint16);
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//
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// *IMPORTANT*
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// The ADC_cal function, which copies the ADC calibration values from
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// TI reserved OTP into the ADCREFSEL and ADCOFFTRIM registers, occurs
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// automatically in the Boot ROM. If the boot ROM code is bypassed during
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// the debug process, the following function MUST be called for the ADC to
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// function according to specification. The clocks to the ADC MUST be
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// enabled before calling this function. See the device data manual and/or
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// the ADC Reference Manual for more information.
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//
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EALLOW;
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SysCtrlRegs.PCLKCR0.bit.ADCENCLK = 1;
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ADC_cal();
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EDIS;
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//
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// To powerup the ADC the ADCENCLK bit should be set first to enable
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// clocks, followed by powering up the bandgap, reference circuitry, and
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// ADC core. Before the first conversion is performed a 5ms delay must be
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// observed after power up to give all analog circuits time to power up
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// and settle
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//
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//
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// Please note that for the delay function below to operate correctly the
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// CPU_RATE define statement in the DSP2833x_Examples.h file must
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// contain the correct CPU clock period in nanoseconds.
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//
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AdcRegs.ADCTRL3.all = 0x00E0; // Power up bandgap/reference/ADC circuits
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DELAY_US(5000); // Delay before converting ADC channels
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//
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}
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//
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// End of file
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//
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