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explorer16_100p
adc_test.c
Go to the documentation of this file.
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/*
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* "Copyright (c) 2008 Robert B. Reese, Bryan A. Jones, J. W. Bruce ("AUTHORS")"
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* All rights reserved.
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* (R. Reese, reese_AT_ece.msstate.edu, Mississippi State University)
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* (B. A. Jones, bjones_AT_ece.msstate.edu, Mississippi State University)
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* (J. W. Bruce, jwbruce_AT_ece.msstate.edu, Mississippi State University)
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*
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* Permission to use, copy, modify, and distribute this software and its
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* documentation for any purpose, without fee, and without written agreement is
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* hereby granted, provided that the above copyright notice, the following
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* two paragraphs and the authors appear in all copies of this software.
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*
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* IN NO EVENT SHALL THE "AUTHORS" BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
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* OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE "AUTHORS"
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* HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* THE "AUTHORS" SPECIFICALLY DISCLAIMS ANY WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE "AUTHORS" HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS."
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*
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* Please maintain this header in its entirety when copying/modifying
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* these files.
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*
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*
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*/
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#include "
pic24_all.h
"
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#include <stdio.h>
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/** \file
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* Demonstrates reading the internal ADC in 10-bit mode that is
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* connected to an external potentiometer, and printing out the input voltage.
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*
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*/
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#define VREF 3.3 //assume Vref = 3.3 volts
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int
main
(
void
) {
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uint16_t
u16_adcVal;
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float
f_adcVal;
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configBasic
(HELLO_MSG);
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CONFIG_AN5_AS_ANALOG();
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// Configure A/D to sample AN5 for 31 Tad periods in 10-bit mode
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// then perform a single conversion.
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configADC1_ManualCH0
(ADC_CH0_POS_SAMPLEA_AN5, 31, 0);
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while
(1) {
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u16_adcVal =
convertADC1
();
//get ADC value
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f_adcVal = u16_adcVal;
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f_adcVal = f_adcVal/1024.0 * VREF;
//convert to float 0.0 to VREF
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printf(
"ADC input: %4.2f V (0x%04x)\n"
, (
double
) f_adcVal, u16_adcVal);
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DELAY_MS
(300);
//delay so that we do not flood the UART.
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doHeartbeat
();
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}
//end while(1)
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}
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