87 lines
3.9 KiB
C
Executable File
87 lines
3.9 KiB
C
Executable File
/* --COPYRIGHT--,BSD_EX
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* Copyright (c) 2012, Texas Instruments Incorporated
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* * Neither the name of Texas Instruments Incorporated nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*******************************************************************************
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*
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* MSP430 CODE EXAMPLE DISCLAIMER
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*
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* MSP430 code examples are self-contained low-level programs that typically
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* demonstrate a single peripheral function or device feature in a highly
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* concise manner. For this the code may rely on the device's power-on default
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* register values and settings such as the clock configuration and care must
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* be taken when combining code from several examples to avoid potential side
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* effects. Also see www.ti.com/grace for a GUI- and www.ti.com/msp430ware
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* for an API functional library-approach to peripheral configuration.
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*
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* --/COPYRIGHT--*/
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//******************************************************************************
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// MSP430F20x2 Demo - ADC10, Sample A11, Lo_Batt, Set P1.0 if < 2.3V
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//
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// Description: A single sample is made on A11 (AVcc/2) with reference to
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// internal 1.5V Vref. Software sets ADC10SC to start sample and conversion
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// - ADC10SC automatically cleared at EOC. ADC10 internal oscillator times
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// sample (16x) and conversion. ADC10BUSY flag is polled for EOC. If A11
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// (AVcc/2) < 0311h (0.65V) indicating AVcc is less 2.3V, P1.0 set indicating
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// a lo_Batt condition, else reset.
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//
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// MSP430F20x2
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// -----------------
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// /|\| XIN|-
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// | | |
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// --|RST XOUT|-
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// | |
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// |A11 P1.0|-->LED
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//
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// L. Westlund
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// Texas Instruments Inc.
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// May 2006
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// Built with CCE Version: 3.2.0 and IAR Embedded Workbench Version: 3.41A
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//******************************************************************************
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#include <msp430.h>
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int main(void)
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{
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WDTCTL = WDTPW + WDTHOLD; // Stop WDT
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ADC10CTL1 = INCH_11; // AVcc/2
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ADC10CTL0 = SREF_1 + ADC10SHT_2 + REFON + ADC10ON;
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P1DIR |= 0x01; // Set P1.0 to output direction
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for (;;)
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{
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ADC10CTL0 |= ENC + ADC10SC; // Sampling and conversion start
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while (ADC10CTL1 & ADC10BUSY); // ADC10BUSY?
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if (ADC10MEM < 0x311) // ADC10MEM = A11 > 0.65?
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P1OUT |= 0x01; // Set P1.0 LED on
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else
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P1OUT &= ~0x01; // Clear P1.0 LED off
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}
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}
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