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Imants Pulkstenis
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/* --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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// MSP430F20x3 Demo - SD16A Sequence of conversions
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//
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// The SD16A takes a sample of a single sequence of channels: A0, A1, then A2.
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// Sampling begins with ch A0. The 4th conversion result of each channel is
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// stored in memory.
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//
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//
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// MSP430F20x3
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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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// Vin+ -->|A0+ P1.0 |
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// |A01- = VSS |
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// | |
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// Vin+ -->|A1+ P1.2 |
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// |A1- = VSS |
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// | |
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// Vin+ -->|A2+ P1.4 |
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// |A2- = VSS |
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// | |
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// | VREF |---+
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// | | |
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// | | -+- 100nF
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// | | -+-
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// | | |
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// | AVss |---+
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// | |
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//
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//
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// R. B. Elliott / H. Grewal
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// Texas Instruments
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// April 2007
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// Built with IAR Embedded Workbench Version 3.42A and CCE V3.0
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//******************************************************************************
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#include <msp430.h>
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/* Arrays to store SD16 conversion results */
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/* NOTE: arrays need to be global to */
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/* prevent removal by compiler */
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static unsigned int ChA0results = 0x00;
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static unsigned int ChA1results = 0x00;
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static unsigned int ChA2results = 0x00;
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static unsigned int ch_counter=0;
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int main(void)
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{
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volatile unsigned int i; // Use volatile to prevent removal
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// by compiler optimization
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WDTCTL = WDTPW + WDTHOLD; // Stop watchdog timer
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BCSCTL2 |= DIVS_3; // SMCLK/8
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SD16CTL = SD16REFON + SD16SSEL_1; // 1.2V ref, SMCLK
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SD16INCTL0 = SD16INCH0; // Set channel A0+/-
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SD16CCTL0 |= SD16SNGL + SD16UNI + SD16IE;
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// Single conv, 256OSR, unipolar,
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// enable interrupt
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SD16INCTL0 |= SD16INTDLY_0; // Interrupt on 4th sample
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SD16AE = SD16AE0; // P1.0 A0+, A0- = VSS
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for (i = 0; i < 0x3600; i++); // Delay for 1.2V ref startup
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while(1)
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{
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SD16CCTL0 |= SD16SC; // Set bit to start conversion
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__bis_SR_register(LPM0_bits + GIE); // Enter LPM0
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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 = SD16_VECTOR
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__interrupt void SD16ISR(void)
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#elif defined(__GNUC__)
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void __attribute__ ((interrupt(SD16_VECTOR))) SD16ISR (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 (SD16IV)
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{ case 2: // SD16MEM Overflow
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break;
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case 4: // SD16MEM0 IFG
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switch(ch_counter)
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{
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case 0:
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ChA0results = SD16MEM0; // Save CH0 results (clears IFG)
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SD16AE &= ~SD16AE0; // Disable external input A0+, A0
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SD16INCTL0 &= ~SD16INCH_0; // Disable channel A0+/-
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ch_counter++;
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SD16INCTL0 |= SD16INCH_1; // Enable channel A1+/-
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SD16AE |= SD16AE2; // Enable external input on A1+
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break;
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case 1:
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ChA1results = SD16MEM0; // Save CH1 results (clears IFG)
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SD16AE &= ~SD16AE2; // Disable external input A1+, A1
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SD16INCTL0 &= ~SD16INCH_1; // Disable channel A1+/-
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ch_counter++;
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SD16INCTL0 |= SD16INCH_2; // Enable channel A2+/-
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SD16AE |= SD16AE4; // Enable external input on A2+
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break;
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case 2:
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ChA2results = SD16MEM0; // Save CH2 results (clears IFG)
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ch_counter = 0; // Reset channel count (end of seq)
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SD16AE = SD16AE0; // Reset external input to A0+/-
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SD16INCTL0 = SD16INCH_0; // Reset channel observed
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break;
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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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}
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