129 lines
5.7 KiB
C
Executable File
129 lines
5.7 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 A7, 1.5V, TA1 Trig, Ultra-Low Pwr
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//
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// Description: A7 is sampled 1024/second (32xACLK)with reference to 1.5V. All
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// activity is interrupt driven with proper usage of MSP430 low-power modes,
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// ADC10 and Vref demonstrated. Timer_A with both TA1/TA0 used in upmode to
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// drive ADC10 conversion (continuous mode can also be used). Inside
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// of TA0_ISR software will enable ADC10 and internal reference and
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// allow > 30us delay for Vref to stabilize prior to sample start. Sample
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// start is automatically triggered by TA1 every 32 ACLK cycles. ADC10_ISR
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// will disable ADC10 and Vref and compare ADC10 conversion code. Internal
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// oscillator times sample (16x) and conversion (13x). If A7 > 0.2Vcc,
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// P1.0 is set, else reset. Normal Mode is LPM3.
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// //* An external watch crystal on XIN XOUT is required for ACLK *//
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//
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// +-----(0.9766us)---------\\------------------>+
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// TA0_ISR TA1 ADC10_ISR TA0_ISR TA1
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// -----+------------+------------+-----------\\------+------------+----->
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// Enable ADC Trigger ADC Disable ADC
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// and Vref Compare
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// +-( >30us--->+
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//
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//
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// MSP430F20x2
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// -----------------
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// /|\| XIN|-
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// | | | 32kHz
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// --|RST XOUT|-
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// | |
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// >---|P1.7/A7 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_7 + SHS_1; // P1.7, TA1 trigger sample start
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ADC10AE0 = 0x80; // P1.7 ADC10 option select
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P1DIR |= 0x01; // Set P1.0 to output direction
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TACCTL0 = CCIE; // Enable interrupt
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TACCR0 = 32-1; // PWM Period
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TACCTL1 = OUTMOD_3; // TACCR1 set/reset
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TACCR1 = 2; // TACCR1 PWM Duty Cycle
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TACTL = TASSEL_1 + MC_1; // ACLK, up mode
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__bis_SR_register(LPM3_bits + GIE); // Enter LPM3, enable interrupts
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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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ADC10CTL0 &= ~ENC; // ADC10 disabled
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ADC10CTL0 = 0; // ADC10, Vref disabled completely
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if (ADC10MEM < 0x88) // ADC10MEM = A7 > 0.2V?
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P1OUT &= ~0x01; // Clear P1.0 LED off
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else
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P1OUT |= 0x01; // Set P1.0 LED on
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}
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// Timer A0 interrupt service routine
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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 Timer_A(void)
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#elif defined(__GNUC__)
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void __attribute__ ((interrupt(TIMERA0_VECTOR))) Timer_A (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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ADC10CTL0 = SREF_1 + ADC10SHT_2 + REFON + ADC10ON + ADC10IE;
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ADC10CTL0 |= ENC; // ADC10 enable set
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}
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