Rewrote main.c for distance lab5.
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/*
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* main.c
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*
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* MSP-EXP430G2-LaunchPad User Experience Application
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*
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* Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
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*
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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
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* 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
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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#include "msp430.h"
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* Heavily modified: Nov, 2013 Carl Michal
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* Even more so, February, 2014
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#define TRIG BIT4
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#define ECHO BIT5
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* This version modified to use the Hardware UART on MSP430G2553
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* see code at https://bennthomsen.wordpress.com/engineering-toolbox/ti-msp430-launchpad/msp430g2553-hardware-uart/
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* jumpers for TX/RX on Launchpad board must be rotated 90 degrees
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* for hardware UART used here!!
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* This may not work on all revisions of the board?
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#define TXD BIT2
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#define RXD BIT1
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*/
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/******************************************************************************
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* MSP-EXP430G2-LaunchPad User Experience Application
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*
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* 1. Device starts up in LPM3 + blinking LED to indicate device is alive
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* + Upon first button press, device transitions to application mode
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* 2. Application Mode
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* + Continuously sample ADC Temp Sensor channel
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*
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* + Transmit temperature value via TimerA UART to PC
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*
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*
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* Texas Instruments, Inc.
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******************************************************************************/
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#include "msp430.h"
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#define LED1 BIT0
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#define LED2 BIT6
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#define TRIG BIT4
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#define ECHO BIT5
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#define BUTTON BIT3
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#define TXD BIT2 // TXD on P1.2
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#define RXD BIT1 // RXD on P1.1
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#define PreAppMode 0
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#define RunningMode 1
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#define SOUND 34029 // speed of sound in cm/s
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#define US 1000000 // microseconds in a second
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unsigned int TXByte;
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volatile unsigned int Mode;
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void InitializeButton(void);
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void PreApplicationMode(void);
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void main(void) {
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WDTCTL = WDTPW + WDTHOLD; // Stop WDT
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void main(void)
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{
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long tempMeasured;
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BCSCTL1 = CALBC1_1MHZ; // Set range
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DCOCTL = CALDCO_1MHZ;
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BCSCTL2 &= ~(DIVS_3); // SMCLK = DCO = 1 MHz
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WDTCTL = WDTPW + WDTHOLD; // Stop WDT
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/* next three lines to use internal calibrated 1MHz clock: */
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BCSCTL1 = CALBC1_1MHZ; // Set range
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DCOCTL = CALDCO_1MHZ;
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BCSCTL2 &= ~(DIVS_3); // SMCLK = DCO = 1MHz
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InitializeButton();
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// setup port for leds:
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P1DIR |= LED1 + LED2;
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P1OUT &= ~(LED1 + LED2);
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P1SEL = BIT1 + BIT2 ; // P1.1 = RXD, P1.2=TXD
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P1SEL2 = BIT1 + BIT2 ; // P1.1 = RXD, P1.2=TXD
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UCA0CTL1 |= UCSSEL_2; // Use SMCLK
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UCA0BR0 = 104; // Set baud rate to 9600 with 1MHz clock (Data Sheet 15.3.13)
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UCA0BR1 = 0; // Set baud rate to 9600 with 1MHz clock
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UCA0MCTL = UCBRS0; // Modulation UCBRSx = 1
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UCA0CTL1 &= ~UCSWRST; // Initialize USCI state machine
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P1DIR |= TXD;
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P1OUT |= TXD;
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Mode = PreAppMode;
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PreApplicationMode(); // Blinks LEDs, waits for button press
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P1DIR |= TRIG;
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P1DIR &= ~ECHO;
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P1IE |= ECHO;
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/* Configure ADC Temp Sensor Channel */
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ADC10CTL1 = INCH_10 + ADC10DIV_3; // Temp Sensor ADC10CLK/4
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ADC10CTL0 = SREF_1 + ADC10SHT_3 + REFON + ADC10ON + ADC10IE;
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TACTL = TASSEL_2 | ID_0 | MC_2; // set timer to count up
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__enable_interrupt();
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__delay_cycles(1000); // Wait for ADC Ref to settle
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while (1) {
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P1OUT |= TRIG; // start trigger signal
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__delay_cycles(15); // we need a >10 us pulse but one clock cycle is 1 us
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P1OUT &= ~TRIG; // end trigger signal
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__enable_interrupt(); // Enable interrupts.
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P1IES &= ~ECHO;
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__bis_SR_register(LPM0_bits + GIE);
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TAR = 0;
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P1IES |= ECHO;
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__bis_SR_register(LPM0_bits + GIE);
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/* Configure hardware UART */
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P1SEL = BIT1 + BIT2 ; // P1.1 = RXD, P1.2=TXD
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P1SEL2 = BIT1 + BIT2 ; // P1.1 = RXD, P1.2=TXD
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UCA0CTL1 |= UCSSEL_2; // Use SMCLK
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UCA0BR0 = 104; // Set baud rate to 9600 with 1MHz clock (Data Sheet 15.3.13)
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UCA0BR1 = 0; // Set baud rate to 9600 with 1MHz clock
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UCA0MCTL = UCBRS0; // Modulation UCBRSx = 1
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UCA0CTL1 &= ~UCSWRST; // Initialize USCI state machine
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/* if we were going to receive, we would also:
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IE2 |= UCA0RXIE; // Enable USCI_A0 RX interrupt
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*/
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TXByte = TAR; // time elapsed in us (approx)
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while (!(IFG2 & UCA0TXIFG)); // wait for TX buffer to be ready for new data
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UCA0TXBUF = TXByte * SOUND / US / 2; // curiously, this is a factor of 2 off
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/* Main Application Loop */
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while(1)
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{
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/*
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ADC10CTL0 |= ENC + ADC10SC; // Sampling and conversion start
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__bis_SR_register(CPUOFF + GIE); // LPM0 with interrupts enabled turns cpu off.
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// an interrupt is triggered when the ADC result is ready.
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// The interrupt handler restarts the cpu.
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// store result
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tempMeasured = ADC10MEM;
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// convert to farenheit and send to host computer
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TXByte = (unsigned char)( ((tempMeasured - 630) * 761) / 1024 );
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while (! (IFG2 & UCA0TXIFG)); // wait for TX buffer to be ready for new data
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UCA0TXBUF = TXByte;
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P1OUT ^= LED1; // toggle the light every time we make a measurement.
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// set up timer to wake us in a while:
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TACCR0 = 2400; // period
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TACTL = TASSEL_1 | MC_1; // TACLK = ACLK, Up mode.
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TACCR1 = 2400; // interrupt at end
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TACCTL1 = CCIE; // TACCTL0
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// go to sleep, wait till timer expires to do another measurement.
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__bis_SR_register(LPM3_bits + GIE); // LPM0 with interrupts enabled turns cpu off.
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// could have just done this - but low power mode is nicer.
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// __delay_cycles(500000);
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*/
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P1IE |= ECHO; // set echo input as interrupt
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P1OUT |= TRIG; // start trigger signal
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__delay_cycles(10); // we need a 10 us pulse but one clock cycle is 1 us
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P1OUT &= ~TRIG; // end trigger signal
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TACTL = TACLR;
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TACTL = TASSEL_2 | ID_3 | MC_2; // set timer to count up
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unsigned int start = TAR;
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__bis_SR_register(LPM0_bits + GIE); // low-power mode 0 (SMCLK still on)
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unsigned int stop = TAR;
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TXByte = stop - start;
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while (! (IFG2 & UCA0TXIFG)); // wait for TX buffer to be ready for new data
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UCA0TXBUF = TXByte;
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P1OUT ^= LED1;
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__delay_cycles(10000); // wait 10 ms before measuring again
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__delay_cycles(100000); // wait 100 ms before measuring again
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}
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}
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void PreApplicationMode(void)
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{
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P1DIR |= LED1 + LED2;
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P1OUT |= LED1; // To enable the LED toggling effect
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P1OUT &= ~LED2;
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/* these next two lines configure the ACLK signal to come from
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a secondary oscillator source, called VLO */
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BCSCTL1 |= DIVA_1; // ACLK is half the speed of the source (VLO)
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BCSCTL3 |= LFXT1S_2; // ACLK = VLO
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/* here we're setting up a timer to fire an interrupt periodically.
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When the timer 1 hits its limit, the interrupt will toggle the lights
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We're using ACLK as the timer source, since it lets us go into LPM3
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(where SMCLK and MCLK are turned off). */
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TACCR0 = 1200; // period
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TACTL = TASSEL_1 | MC_1; // TACLK = ACLK, Up mode.
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TACCTL1 = CCIE + OUTMOD_3; // TACCTL1 Capture Compare
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TACCR1 = 600; // duty cycle
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__bis_SR_register(LPM3_bits + GIE); // LPM3 with interrupts enabled
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// in LPM3, MCLCK and SMCLK are off, but ACLK is on.
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}
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// this gets used in pre-application mode only to toggle the lights:
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#if defined(__TI_COMPILER_VERSION__)
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#pragma vector=TIMER0_A1_VECTOR
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__interrupt void ta1_isr (void)
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#else
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void __attribute__ ((interrupt(TIMER0_A1_VECTOR))) ta1_isr (void)
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#endif
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{
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TACCTL1 &= ~CCIFG; // reset the interrupt flag
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if (Mode == PreAppMode){
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P1OUT ^= (LED1 + LED2); // toggle the two lights.
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}
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else{
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TACCTL1 = 0; // no more interrupts.
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__bic_SR_register_on_exit(LPM3_bits); // Restart the cpu
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}
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}
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void InitializeButton(void) // Configure Push Button
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{
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P1DIR &= ~BUTTON;
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P1OUT |= BUTTON;
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P1REN |= BUTTON;
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P1IES |= BUTTON;
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P1IFG &= ~BUTTON;
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P1IE |= BUTTON;
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}
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/* *************************************************************
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* Port Interrupt for Button Press
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* 1. During standby mode: to enter application mode
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*
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* *********************************************************** */
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#if defined(__TI_COMPILER_VERSION__)
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#pragma vector=PORT1_VECTOR
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__interrupt void port1_isr(void)
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@ -246,48 +62,6 @@ __interrupt void port1_isr(void)
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void __attribute__ ((interrupt(PORT1_VECTOR))) port1_isr (void)
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#endif
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{
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/* this disables port1 interrupts for a little while so that
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we don't try to respond to two consecutive button pushes right together.
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The watchdog timer interrupt will re-enable port1 interrupts
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This whole watchdog thing is completely unnecessary here, but its useful
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to see how it is done.
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*/
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P1IFG = 0; // clear out interrupt flag
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P1IE &= ~BUTTON; // Disable port 1 interrupts
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WDTCTL = WDT_ADLY_250; // set up watchdog timer duration
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IFG1 &= ~WDTIFG; // clear interrupt flag
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IE1 |= WDTIE; // enable watchdog interrupts
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TACCTL1 = 0; // turn off timer 1 interrupts
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P1OUT &= ~(LED1+LED2); // turn off the leds
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Mode = RunningMode;
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__bic_SR_register_on_exit(LPM3_bits); // take us out of low power mode
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}
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// WDT Interrupt Service Routine used to de-bounce button press
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#if defined(__TI_COMPILER_VERSION__)
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#pragma vector=WDT_VECTOR
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__interrupt void wdt_isr(void)
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#else
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void __attribute__ ((interrupt(WDT_VECTOR))) wdt_isr (void)
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#endif
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{
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IE1 &= ~WDTIE; /* disable watchdog interrupt */
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IFG1 &= ~WDTIFG; /* clear interrupt flag */
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WDTCTL = WDTPW + WDTHOLD; /* put WDT back in hold state */
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P1IE |= BUTTON; /* Debouncing complete - reenable port 1 interrupts*/
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}
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// ADC10 interrupt service routine
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#if defined(__TI_COMPILER_VERSION__)
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#pragma vector=ADC10_VECTOR
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__interrupt void adc10_isr(void)
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#else
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void __attribute__ ((interrupt(ADC10_VECTOR))) adc10_isr (void)
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#endif
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{
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__bic_SR_register_on_exit(CPUOFF); // Restart the cpu
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P1IFG = 0;
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__bic_SR_register_on_exit(LPM0_bits); // take us out of low power mode
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}
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