132 lines
5.4 KiB
C
Executable File
132 lines
5.4 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 A10 Temp and Convert to oC and oF
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//
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// Description: A single sample is made on A10 with reference to internal
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// 1.5V Vref. Software sets ADC10SC to start sample and conversion - ADC10SC
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// automatically cleared at EOC. ADC10 internal oscillator/4 times sample
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// (64x) and conversion. In Mainloop MSP430 waits in LPM0 to save power until
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// ADC10 conversion complete, ADC10_ISR will force exit from any LPMx in
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// Mainloop on reti. Temperaure in oC stored in IntDegC, oF in IntDegF.
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// Uncalibrated temperature measured from device to device will vary with
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// slope and offset - please see datasheet.
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// ACLK = n/a, MCLK = SMCLK = default DCO ~1.2MHz, ADC10CLK = ADC10OSC/4
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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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// |A10 |
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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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long temp;
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long IntDegF;
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long IntDegC;
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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_10 + ADC10DIV_3; // Temp Sensor ADC10CLK/4
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ADC10CTL0 = SREF_1 + ADC10SHT_3 + REFON + ADC10ON + ADC10IE;
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__enable_interrupt(); // Enable interrupts.
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TACCR0 = 30; // Delay to allow Ref to settle
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TACCTL0 |= CCIE; // Compare-mode interrupt.
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TACTL = TASSEL_2 | MC_1; // TACLK = SMCLK, Up mode.
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LPM0; // Wait for delay.
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TACCTL0 &= ~CCIE; // Disable timer Interrupt
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__disable_interrupt();
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while(1)
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{
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ADC10CTL0 |= ENC + ADC10SC; // Sampling and conversion start
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__bis_SR_register(CPUOFF + GIE); // LPM0 with interrupts enabled
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// oF = ((A10/1024)*1500mV)-923mV)*1/1.97mV = A10*761/1024 - 468
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temp = ADC10MEM;
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IntDegF = ((temp - 630) * 761) / 1024;
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// oC = ((A10/1024)*1500mV)-986mV)*1/3.55mV = A10*423/1024 - 278
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temp = ADC10MEM;
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IntDegC = ((temp - 673) * 423) / 1024;
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__no_operation(); // SET BREAKPOINT HERE
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}
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}
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// ADC10 interrupt service routine
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#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
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#pragma vector=ADC10_VECTOR
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__interrupt void ADC10_ISR (void)
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#elif defined(__GNUC__)
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void __attribute__ ((interrupt(ADC10_VECTOR))) ADC10_ISR (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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__bic_SR_register_on_exit(CPUOFF); // Clear CPUOFF bit from 0(SR)
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}
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#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
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#pragma vector=TIMERA0_VECTOR
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__interrupt void ta0_isr(void)
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#elif defined(__GNUC__)
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void __attribute__ ((interrupt(TIMERA0_VECTOR))) ta0_isr (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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TACTL = 0;
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LPM0_EXIT; // Exit LPM0 on return
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}
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