This Code has been edited so that it can be compiled with msp430-gcc:
/******************************************************************************
* MSP-EXP430G2-LaunchPad User Experience Application
*
* 1. Device starts up in LPM3 + blinking LED to indicate device is alive
* + Upon first button press, device transitions to application mode
* 2. Application Mode
* + Continuously sample ADC Temp Sensor channel, compare result against
* initial value
* + Set PWM based on measured ADC offset: Red LED for positive offset, Green
* LED for negative offset
* + Transmit temperature value via TimerA UART to PC
* + Button Press --> Calibrate using current temperature
* Send character '°' via UART, notifying PC
******************************************************************************/
//#include <msp430x20x2.h> <-taken care of by includeing io.h and setting -mmcu=msp430x2012 in cflags
#include <io.h>
#include <signal.h>
#define LED0 BIT0
#define LED1 BIT6
#define LED_DIR P1DIR
#define LED_OUT P1OUT
#define BUTTON BIT3
#define BUTTON_OUT P1OUT
#define BUTTON_DIR P1DIR
#define BUTTON_IN P1IN
#define BUTTON_IE P1IE
#define BUTTON_IES P1IES
#define BUTTON_IFG P1IFG
#define BUTTON_REN P1REN
#define TXD BIT1 // TXD on P1.1
#define RXD BIT2 // RXD on P1.2
#define APP_STANDBY_MODE 0
#define APP_APPLICATION_MODE 1
#define TIMER_PWM_MODE 0
#define TIMER_UART_MODE 1
#define TIMER_PWM_PERIOD 2000
#define TIMER_PWM_OFFSET 20
#define TEMP_SAME 0
#define TEMP_HOT 1
#define TEMP_COLD 2
#define TEMP_THRESHOLD 5
// Conditions for 9600/4=2400 Baud SW UART, SMCLK = 1MHz
#define Bitime_5 0x05*4 // ~ 0.5 bit length + small adjustment
#define Bitime 13*4//0x0D
#define UART_UPDATE_INTERVAL 1000
unsigned char BitCnt;
unsigned char applicationMode = APP_STANDBY_MODE;
unsigned char timerMode = TIMER_PWM_MODE;
unsigned char tempMode;
unsigned char calibrateUpdate = 0;
unsigned char tempPolarity = TEMP_SAME;
unsigned int TXByte;
/* Using an 8-value moving average filter on sampled ADC values */
long tempMeasured[8];
unsigned char tempMeasuredPosition=0;
long tempAverage,tempAverage2;
long tempCalibrated, tempDifference;
void InitializeLeds(void);
void InitializeButton(void);
void PreApplicationMode(void); // Blinks LED, waits for button press
void ConfigureAdcTempSensor(void);
void ConfigureTimerPwm(void);
void ConfigureTimerUart(void);
void Transmit(void);
void InitializeClocks(void);
static void __inline__ delay(register unsigned int n);
void main(void)
{
unsigned int uartUpdateTimer = UART_UPDATE_INTERVAL;
unsigned char i;
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
InitializeClocks();
InitializeButton();
InitializeLeds();
PreApplicationMode(); // Blinks LEDs, waits for button press
/* Application Mode begins */
applicationMode = APP_APPLICATION_MODE;
ConfigureAdcTempSensor();
ConfigureTimerPwm();
__enable_interrupt(); // Enable interrupts.
/* Main Application Loop */
while(1)
{
ADC10CTL0 |= ENC + ADC10SC; // Sampling and conversion start
__bis_SR_register(CPUOFF + GIE); // LPM0 with interrupts enabled
/* Moving average filter out of 8 values to somewhat stabilize sampled ADC */
tempMeasured[tempMeasuredPosition++] = ADC10MEM;
if (tempMeasuredPosition == 8)
tempMeasuredPosition = 0;
tempAverage2 = 0;
for (i = 0; i < 8; i++)
tempAverage2 += tempMeasured[i];
tempAverage2 >>= 3; // Divide by 8 to get average
tempAverage=tempAverage2; //use temporary avarage to prevent ISRs from using intermediate values
if ((--uartUpdateTimer == 0) || calibrateUpdate )
{
ConfigureTimerUart();
if (calibrateUpdate)
{
TXByte = 248; // A character with high value, outside of temp range
Transmit();
calibrateUpdate = 0;
}
TXByte = (unsigned char)( ((tempAverage - 630) * 761) / 1024 );
Transmit();
uartUpdateTimer = UART_UPDATE_INTERVAL;
ConfigureTimerPwm();
}
tempDifference = tempAverage - tempCalibrated;
if (tempDifference < -TEMP_THRESHOLD)
{
tempDifference = -tempDifference;
tempPolarity = TEMP_COLD;
LED_OUT &= ~ LED1;
}
else
if (tempDifference > TEMP_THRESHOLD)
{
tempPolarity = TEMP_HOT;
LED_OUT &= ~ LED0;
}
else
{
tempPolarity = TEMP_SAME;
TACCTL0 &= ~CCIE;
TACCTL1 &= ~CCIE;
LED_OUT &= ~(LED0 + LED1);
}
if (tempPolarity != TEMP_SAME)
{
tempDifference <<= 3;
tempDifference += TIMER_PWM_OFFSET;
TACCR1 = ( (tempDifference) < (TIMER_PWM_PERIOD-1) ? (tempDifference) : (TIMER_PWM_PERIOD-1) );
TACCTL0 |= CCIE;
TACCTL1 |= CCIE;
}
}
}
void PreApplicationMode(void)
{
LED_DIR |= LED0 + LED1;
LED_OUT |= LED0; // To enable the LED toggling effect
LED_OUT &= ~LED1;
BCSCTL1 |= DIVA_1; // ACLK/2
BCSCTL3 |= LFXT1S_2; // ACLK = VLO
TACCR0 = 1200; //
TACTL = TASSEL_1 | MC_1; // TACLK = SMCLK, Up mode.
TACCTL1 = CCIE + OUTMOD_3; // TACCTL1 Capture Compare
TACCR1 = 600;
__bis_SR_register(LPM3_bits + GIE); // LPM0 with interrupts enabled
}
void ConfigureAdcTempSensor(void)
{
unsigned int i;
/* Configure ADC Temp Sensor Channel */
ADC10CTL1 = INCH_10 + ADC10DIV_3; // Temp Sensor ADC10CLK/4
ADC10CTL0 = SREF_1 + ADC10SHT_3 + REFON + ADC10ON + ADC10IE;
delay(1000); // Wait for ADC Ref to settle
ADC10CTL0 |= ENC + ADC10SC; // Sampling and conversion start
__bis_SR_register(CPUOFF + GIE); // LPM0 with interrupts enabled
tempCalibrated = ADC10MEM;
for (i=0; i < 8; i++)
tempMeasured[i] = tempCalibrated;
tempAverage = tempCalibrated;
}
void ConfigureTimerPwm(void)
{
timerMode = TIMER_PWM_MODE;
TACCR0 = TIMER_PWM_PERIOD; //
TACTL = TASSEL_2 | MC_1; // TACLK = SMCLK, Up mode.
TACCTL0 = CCIE;
TACCTL1 = CCIE + OUTMOD_3; // TACCTL1 Capture Compare
TACCR1 = 1;
}
void ConfigureTimerUart(void)
{
timerMode = TIMER_UART_MODE; // Configure TimerA0 UART TX
CCTL0 = OUT; // TXD Idle as Mark
TACTL = TASSEL_2 + MC_2 + ID_3; // SMCLK/8, continuous mode
P1SEL |= TXD + RXD; //
P1DIR |= TXD; //
}
// Function Transmits Character from TXByte
void Transmit()
{
// while (CCR0 != TAR) // Prevent async capture
// CCR0 = TAR; // Current state of TA counter
asm( // Re-implement timer capture in assembly
"JMP 2f \n"
"1: \n"
"MOV &0x0170,&0x0172 \n"
"2: \n"
"CMP &0x0170,&0x0172\n"
"JNZ 1b \n");
CCR0 += Bitime; // Some time till first bit
BitCnt = 0xA; // Load Bit counter, 8data + ST/SP
TXByte |= 0x100; // Add mark stop bit to TXByte
TXByte = TXByte << 1; // Add space start bit
CCTL0 = CCIS0 + OUTMOD0 + CCIE; // TXD = mark = idle
while ( CCTL0 & CCIE )delay(5); // Wait for TX completion, added short delay
}
// Timer A0 interrupt service routine
interrupt(TIMERA0_VECTOR) Timer_A (void)
{
if (timerMode == TIMER_UART_MODE)
{
CCR0 += Bitime; // Add Offset to CCR0
if (CCTL0 & CCIS0) // TX on CCI0B?
{
if ( BitCnt == 0)
CCTL0 &= ~ CCIE; // All bits TXed, disable interrupt
else
{
CCTL0 |= OUTMOD2; // TX Space
if (TXByte & 0x01)
CCTL0 &= ~ OUTMOD2; // TX Mark
TXByte = TXByte >> 1;
BitCnt --;
}
}
}
else
{
if (tempPolarity == TEMP_HOT)
LED_OUT |= LED1;
if (tempPolarity == TEMP_COLD)
LED_OUT |= LED0;
TACCTL0 &= ~CCIFG;
}
}
interrupt(TIMERA1_VECTOR) ta1_isr(void)
{
TACCTL1 &= ~CCIFG;
if (applicationMode == APP_APPLICATION_MODE)
LED_OUT &= ~(LED0 + LED1);
else
LED_OUT ^= (LED0 + LED1);
}
void InitializeClocks(void)
{
BCSCTL1 = CALBC1_1MHZ; // Set range
DCOCTL = CALDCO_1MHZ;
BCSCTL2 &= ~(DIVS_3); // SMCLK = DCO / 8 = 1MHz
}
void InitializeButton(void) // Configure Push Button
{
BUTTON_DIR &= ~BUTTON;
BUTTON_OUT |= BUTTON;
BUTTON_REN |= BUTTON;
BUTTON_IES |= BUTTON;
BUTTON_IFG &= ~BUTTON;
BUTTON_IE |= BUTTON;
}
void InitializeLeds(void)
{
LED_DIR |= LED0 + LED1;
LED_OUT &= ~(LED0 + LED1);
}
// Delay Routine from mspgcc help file
static void __inline__ delay(register unsigned int n)
{
__asm__ __volatile__ (
"1: \n"
" dec %[n] \n"
" jne 1b \n"
: [n] "+r"(n));
}
/* *************************************************************
* Port Interrupt for Button Press
* 1. During standby mode: to exit and enter application mode
* 2. During application mode: to recalibrate temp sensor
* *********************************************************** */
interrupt(PORT1_VECTOR) PORT1_ISR(void)
{
BUTTON_IFG = 0;
BUTTON_IE &= ~BUTTON; /* Debounce */
WDTCTL = WDT_ADLY_250;
IFG1 &= ~WDTIFG; /* clear interrupt flag */
IE1 |= WDTIE;
if (applicationMode == APP_APPLICATION_MODE)
{
tempCalibrated = tempAverage;
calibrateUpdate = 1;
}
else
{
applicationMode = APP_APPLICATION_MODE; // Switch from STANDBY to APPLICATION MODE
__bic_SR_register_on_exit(LPM3_bits);
}
}
interrupt(WDT_VECTOR) WDT_ISR(void)
{
IE1 &= ~WDTIE; /* disable interrupt */
IFG1 &= ~WDTIFG; /* clear interrupt flag */
WDTCTL = WDTPW + WDTHOLD; /* put WDT back in hold state */
BUTTON_IE |= BUTTON; /* Debouncing complete */
}
// ADC10 interrupt service routine
interrupt(ADC10_VECTOR) ADC10_ISR (void)
{
__bic_SR_register_on_exit(CPUOFF); // Return to active mode
}