111 lines
4.6 KiB
C
Executable File
111 lines
4.6 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, Output Internal Vref on P1.4 & ADCCLK on P1.3
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//
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// Description: Output ADC10 internal Vref on P1.4, toggling between two
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// avaialble options, 2.5v and 1.5v. ADC10OSC also output on P1.3.
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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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// Vref<-|A4/P1.4 P1.3|--> ADC10OSC ~ 3.5MHz - 6.5MHz
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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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void delay(void); // Software delay
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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 = CONSEQ_2; // Repeat single channel
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ADC10CTL0 = REFOUT + REFON + MSC + ADC10ON;
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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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ADC10AE0 |= 0x10; // P1.4 ADC option select
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P1DIR |= 0x08; // Set P1.3 output direction
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P1SEL |= 0x08; // Set P1.3 option select
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for (;;)
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{
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ADC10CTL0 &= ~ENC; // ADC10 disable
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ADC10CTL0 ^= REF2_5V; // Toggle Vref 1.5/2.5V
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ADC10CTL0 |= ENC + ADC10SC; // Sampling and conversion start
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delay();
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}
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}
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void delay(void)
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{
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volatile unsigned long i;
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for (i = 0x7FFFF; i > 0; i--);
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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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