Description: Use ADC12 and the integrated temperature sensor to detect
// temperature gradients. The temperature sensor output voltage is sampled
// ~ every 80ms and compared with the defined delta values using an ISR.
// (ADC12OSC/256)/ determines sample time which needs to be greater than
// 30us for temperature sensor.
// ADC12 is operated in repeat-single channel mode with the sample and
// convert trigger sourced from Timer_A CCR1. The ADC12MEM0_IFG at the end
// of each converstion will trigger an ISR.
// ACLK = n/a, MCLK = SMCLK = default DCO ~ 800k, ADC12CLK = ADC12OSC
#include <msp430.h>
#define ADCDeltaOn 12 // ~2 Deg C delta
static unsigned int FirstADCVal; // holds 1st ADC result
int main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop watchdog
P1OUT = 0x00; // Clear P1
P1DIR = 0x01; // P1.0 as output
ADC12CTL1 = SHS_1 + SHP + CONSEQ_2; // TA trig., rpt conv.
ADC12MCTL0 = SREF_1 + INCH_10; // Channel A10, Vref+
ADC12IE = 0x01; // Enable ADC12IFG.0
ADC12CTL0 = SHT0_8 + REF2_5V + REFON + ADC12ON + ENC; // Config ADC12
TACCTL1 = OUTMOD_4; // Toggle on EQU1 (TAR = 0)
TACTL = TASSEL_2 + MC_2; // SMCLK, cont-mode
while (!(0x01 & ADC12IFG)); // First conversion?
FirstADCVal = ADC12MEM0; // Read out 1st ADC value
_BIS_SR(LPM0_bits + GIE); // Enter LPM0 w/ interrupt
}
#pragma vector=ADC12_VECTOR
__interrupt void ADC12ISR (void)
{
if (ADC12MEM0 <= FirstADCVal + ADCDeltaOn)
P1OUT &= ~0x01; // LED off
else P1OUT |= 0x01; // LED on
}
我是个初学者，这个程序的其他地方还可以读懂，就是SHT0_8不知道是怎么确定的，请大神解答。 |
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