//****************************************************************************** // MSP430G2x32/G2x52 Demo - ADC10, Sample A10 Temp and Convert to oC and oF // // Description: A single sample is made on A10 with reference to internal // 1.5V Vref Software sets ADC10SC to start sample and conversion - ADC10SC // automatically cleared at EOC ADC10 internal oscillator/4 times sample // (64x) and conversion In Mainloop MSP430 waits in LPM0 to save power until // ADC10 conversion complete, ADC10_ISR will force exit from any LPMx in // Mainloop on reti Temperaure in oC stored in IntDegC, oF in IntDegF // Uncalibrated temperature measured from device to device will vary with // slope and offset - please see datasheet // ACLK = n/a, MCLK = SMCLK = default DCO ~1.2MHz, ADC10CLK = ADC10OSC/4 // // MSP430G2x32/G2x52 // // /|\| XIN|// | | | // |RST XOUT|// | | // |A10 | // // D Dang // Texas Instruments Inc // December 2010 // Built with CCS Version 4.2.0 and IAR Embedded Workbench Version: 5.10 //****************************************************************************** #include "msp430g2452.h" long temp; long IntDegF; long IntDegC; void main(void) { WDTCTL = WDTPW + WDTHOLD; // Stop WDT ADC10CTL1 = INCH_10 + ADC10DIV_3; // Temp Sensor ADC10CLK/4 ADC10CTL0 = SREF_1 + ADC10SHT_3 + REFON + ADC10ON + ADC10IE; enable_interrupt(); // Enable interrupts TACCR0 = 30; // Delay to allow Ref to settle TACCTL0 |= CCIE; // Compare-mode interrupt TACTL = TASSEL_2 | MC_1; // TACLK = SMCLK, Up mode LPM0; // Wait for delay TACCTL0 &= ~CCIE; // Disable timer Interrupt disable_interrupt(); while(1) { ADC10CTL0 |= ENC + ADC10SC; bis_SR_register(CPUOFF + GIE); // Sampling and conversion start // LPM0 with interrupts enabled // oF = ((A10/1024)*1500mV)-923mV)*1/1.97mV = A10*761/1024 - 468 temp = ADC10MEM; IntDegF = ((temp - 630) * 761) / 1024; // oC = ((A10/1024)*1500mV)-986mV)*1/3.55mV = A10*423/1024 - 278 temp = ADC10MEM; IntDegC = ((temp - 673) * 423) / 1024; } no_operation(); } // ADC10 interrupt service routine #pragma vector=ADC10_VECTOR // SET BREAKPOINT HERE interrupt void ADC10_ISR (void) { bic_SR_register_on_exit(CPUOFF); } #pragma vector=TIMER0_A0_VECTOR interrupt void ta0_isr(void) { TACTL = 0; LPM0_EXIT; } // Clear CPUOFF bit from 0(SR) // Exit LPM0 on return