126 lines
5.3 KiB
C
Executable File
126 lines
5.3 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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// MSP430F20xx Demo - Timer_A, Toggle P1.0-2, Cont. Mode ISR, 32kHz ACLK
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//
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// Description: Use Timer_A CCRx units and overflow to generate four
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// independent timing intervals. For demonstration, CCR0 and CCR1 output
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// units are optionally selected with port pins P1.1 and P1.2 in toggle
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// mode. As such, these pins will toggle when respective CCRx registers match
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// the TAR counter. Interrupts are also enabled with all CCRx units,
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// software loads offset to next interval only - as long as the interval offset
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// is aded to CCRx, toggle rate is generated in hardware. Timer_A overflow ISR
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// is used to toggle P1.0 with software. Proper use of TAIV interrupt vector
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// generator is demonstrated.
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// ACLK = TACLK = 32kHz, MCLK = SMCLK = Default DCO
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// As coded and with TACLK = 32768Hz, toggle rates are:
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// P1.1 = CCR0 = 32768/(2*4) = 4096Hz
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// P1.2 = CCR1 = 32768/(2*16) = 1024Hz
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// P1.0 = overflow = 32768/(2*65536) = 0.25Hz
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// //* External watch crystal on XIN XOUT is required for ACLK *//
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//
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// MSP430F20xx
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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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// | P1.1/TA0|--> CCR0
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// | P1.2/TA1|--> CCR1
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// | P1.0|--> Overflow/software
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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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int main(void)
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{
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WDTCTL = WDTPW + WDTHOLD; // Stop WDT
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P1SEL |= 0x06; // P1.1 - P1.2 option select
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P1DIR |= 0x07; // P1.0 - P1.2 outputs
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CCTL0 = OUTMOD_4 + CCIE; // CCR0 toggle, interrupt enabled
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CCTL1 = OUTMOD_4 + CCIE; // CCR1 toggle, interrupt enabled
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TACTL = TASSEL_1 + MC_2 + TAIE; // ACLK, contmode, interrupt enabled
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__bis_SR_register(LPM3_bits + GIE); // Enter LPM3 w/interrupt
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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_A0 (void)
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#elif defined(__GNUC__)
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void __attribute__ ((interrupt(TIMERA0_VECTOR))) Timer_A0 (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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CCR0 += 4; // Add Offset to CCR0
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}
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// Timer_A2 Interrupt Vector (TAIV) handler
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#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
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#pragma vector=TIMERA1_VECTOR
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__interrupt void Timer_A1(void)
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#elif defined(__GNUC__)
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void __attribute__ ((interrupt(TIMERA1_VECTOR))) Timer_A1 (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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switch( TAIV )
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{
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case 2: CCR1 += 16; // Add Offset to CCR1
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break;
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case 10: P1OUT ^= 0x01; // Timer_A3 overflow
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break;
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}
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}
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