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Lib/Src/DSP2833x_Adc.c

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+// 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/
+//
+// Redistribution and use in source and binary forms, with or without 
+// modification, are permitted provided that the following conditions 
+// are met:
+// 
+//   Redistributions of source code must retain the above copyright 
+//   notice, this list of conditions and the following disclaimer.
+// 
+//   Redistributions in binary form must reproduce the above copyright
+//   notice, this list of conditions and the following disclaimer in the 
+//   documentation and/or other materials provided with the   
+//   distribution.
+// 
+//   Neither the name of Texas Instruments Incorporated nor the names of
+//   its contributors may be used to endorse or promote products derived
+//   from this software without specific prior written permission.
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+// $
+//###########################################################################
+
+//
+// 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
+//
+