119 lines
5.0 KiB
C
Executable File
119 lines
5.0 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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// MSP430F20x3 Demo - SD16, Using the Integrated Temperature Sensor
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//
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// Description: Use SD16 and it's integrated temperature sensor to detect
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// temperature delta. The temperature sensor output voltage is sampled
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// ~ every 240ms and compared with the last value and if more than ~0.5C
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// delta, P1.0 is set, else reset.
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// SD16 Internal VRef, Bipolar offset binary output format used.
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// Watchdog used as interval time and ISR used to start next SD16 conversion.
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// ACLK = n/a, MCLK = default DCO, SMCLK = SD16CLK = default DCO/8
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//
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// MSP430F20x3
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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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// |A6+ |
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// |A6- P1.0|-->LED
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// | |
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//
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// M. Buccini / L. Westlund
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// Texas Instruments Inc.
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// October 2005
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// Built with CCE Version: 3.2.0 and IAR Embedded Workbench Version: 3.40A
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//******************************************************************************
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#include <msp430.h>
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#define ADCDeltaOn 31 // ~0.5 Deg C delta
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static unsigned int LastADCVal; // holds ADC temperature result
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int main(void)
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{
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BCSCTL2 |= DIVS_3; // SMCLK/8
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WDTCTL = WDT_MDLY_32; // WDT Timer interval
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IE1 |= WDTIE; // Enable WDT interrupt
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P1DIR |= 0x01; // P1.0 to output direction
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SD16CTL = SD16REFON +SD16SSEL_1; // 1.2V ref, SMCLK
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SD16INCTL0 = SD16INCH_6; // A6+/-
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SD16CCTL0 = SD16SNGL + SD16IE ; // Single conv, interrupt
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__bis_SR_register(LPM0_bits + GIE); // Enter LPM0 with interrupt
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}
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#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
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#pragma vector=SD16_VECTOR
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__interrupt void SD16ISR(void)
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#elif defined(__GNUC__)
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void __attribute__ ((interrupt(SD16_VECTOR))) SD16ISR (void)
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#else
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#error Compiler not supported!
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#endif
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{
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if (SD16MEM0 <= LastADCVal + ADCDeltaOn)
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P1OUT &= ~0x01; // LED off
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else
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P1OUT |= 0x01; // LED on
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LastADCVal = SD16MEM0; // Store value
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}
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// Watchdog Timer interrupt service routine
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#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
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#pragma vector=WDT_VECTOR
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__interrupt void watchdog_timer(void)
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#elif defined(__GNUC__)
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void __attribute__ ((interrupt(WDT_VECTOR))) watchdog_timer (void)
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#else
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#error Compiler not supported!
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#endif
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{
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SD16CCTL0 |= SD16SC; // Start SD16 conversion
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}
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