extern void ADC_shutdown()
{
ADC_disable();
}
void tempSensor()
{
//Initialize the ADC Module
/*
* Base Address for the ADC Module
* Use Timer trigger 1 as sample/hold signal to start conversion
* USE MODOSC 5MHZ Digital Oscillator as clock source
* Use default clock divider of 1
*/
ADC_init(ADC_BASE,
ADC_SAMPLEHOLDSOURCE_2,
ADC_CLOCKSOURCE_ADCOSC,
ADC_CLOCKDIVIDER_1);
ADC_enable(ADC_BASE);
//Configure Memory Buffer
/*
* Base Address for the ADC Module
* Use input A12 Temp Sensor
* Use positive reference of Internally generated Vref
* Use negative reference of AVss
*/
ADC_configureMemory(ADC_BASE,
ADC_INPUT_TEMPSENSOR,
ADC_VREFPOS_INT,
ADC_VREFNEG_AVSS);
ADC_clearInterrupt(ADC_BASE,
ADC_COMPLETED_INTERRUPT);
// Enable the Memory Buffer Interrupt
ADC_enableInterrupt(ADC_BASE,
ADC_COMPLETED_INTERRUPT);
ADC_startConversion(ADC_BASE,
ADC_REPEATED_SINGLECHANNEL);
// Enable internal reference and temperature sensor
PMM_enableInternalReference();
PMM_enableTempSensor();
// TimerA1.1 (125ms ON-period) - ADC conversion trigger signal
Timer_A_initUpMode(TIMER_A1_BASE, &initUpParam_A1);
//Initialize compare mode to generate PWM1
Timer_A_initCompareMode(TIMER_A1_BASE, &initCompParam);
// Start timer A1 in up mode
Timer_A_startCounter(TIMER_A1_BASE,
TIMER_A_UP_MODE
);
// Delay for reference settling
__delay_cycles(300000);
//Enter LPM3.5 mode with interrupts enabled
while(*tempSensorRunning)
{
__bis_SR_register(LPM3_bits | GIE); // LPM3 with interrupts enabled
__no_operation(); // Only for debugger
if (*tempSensorRunning)
{
// Turn LED1 on when waking up to calculate temperature and update display
P1OUT |= BIT0;
// Calculate Temperature in degree C and F
signed short temp = (ADCMEM0 - CALADC_15V_30C);
*degC = ((long)temp * 10 * (85-30) * 10)/((CALADC_15V_85C-CALADC_15V_30C)*10) + 300;
*degF = (*degC) * 9 / 5 + 320;
// Update temperature on LCD
displayTemp();
P1OUT &= ~BIT0;
}
}
// Loop in LPM3 to while buttons are held down and debounce timer is running
while(TA0CTL & MC__UP)
{
__bis_SR_register(LPM3_bits | GIE); // Enter LPM3
__no_operation();
}
if (*mode == TEMPSENSOR_MODE)
{
// Disable ADC, TimerA1, Internal Ref and Temp used by TempSensor Mode
ADC_disableConversions(ADC_BASE,ADC_COMPLETECONVERSION);
ADC_disable(ADC_BASE);
Timer_A_stop(TIMER_A1_BASE);
PMM_disableInternalReference();
PMM_disableTempSensor();
PMM_turnOffRegulator();
__bis_SR_register(LPM4_bits | GIE); // re-enter LPM3.5
__no_operation();
}
}