104 lines
4.5 KiB
C
Executable File
104 lines
4.5 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, DTC Sample A0 -> TA1, AVcc, DCO
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//
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// Description: Use DTC to sample A0 with reference to AVcc and directly
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// transfer code to TACCR1. Timer_A has been configured for 10-bit PWM mode.
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// TACCR1 duty cycle is automatically proportional to ADC10 A0. WDT_ISR used
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// as a period wakeup timer approximately 45ms based on default ~1.2MHz
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// DCO/SMCLK clock source used in this example for the WDT clock source.
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// Timer_A also uses default DCO.
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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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// >---|P1.0/A0 P1.2|--> TACCR1 - 0-1024 PWM
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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 = WDT_MDLY_32; // WDT ~45ms interval timer
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IE1 |= WDTIE; // Enable WDT interrupt
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ADC10CTL0 = ADC10SHT_2 + ADC10ON;
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ADC10AE0 |= 0x01; // P1.0 ADC option select
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ADC10DTC1 = 0x001; // 1 conversion
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P1DIR |= 0x04; // P1.2 = output
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P1SEL |= 0x04; // P1.2 = TA1 output
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TACCR0 = 1024 - 1; // PWM Period
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TACCTL1 = OUTMOD_7; // TACCR1 reset/set
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TACCR1 = 512; // TACCR1 PWM Duty Cycle
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TACTL = TASSEL_2 + MC_1; // SMCLK, upmode
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while(1)
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{
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__bis_SR_register(LPM0_bits + GIE); // LPM0, WDT_ISR will force exit
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ADC10SA = (unsigned int)&TACCR1; // Data transfer location
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ADC10CTL0 |= ENC + ADC10SC; // Start sampling
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}
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}
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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 WDT_ISR(void)
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#elif defined(__GNUC__)
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void __attribute__ ((interrupt(WDT_VECTOR))) WDT_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(LPM0_bits); // Exit LPM0
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}
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