Program will // cycle through the on-chip comparator_A reference voltages with output on // P1.1.. Normal mode is LPM0, TA0_ISR will interrupt LPM0.. Dang // Texas Instruments Inc.
Trang 1//****************************************************************************** // MSP430G2x11 Demo - Comp_A, Output Reference Voltages on P1.1
//
// Description: Output Comparator_A reference levels on P1.1 Program will // cycle through the on-chip comparator_A reference voltages with output on // P1.1 Normal mode is LPM0, TA0_ISR will interrupt LPM0
// ACLK = n/a, MCLK = SMCLK = default DCO
//
// MSP430G2x11
//
-// /|\|
XIN|-// | | |
// |RST
XOUT|-// | |
// | P1.1/CA1| > Vref
// | |
//
// D Dang
// Texas Instruments Inc
// October 2010
// Built with CCS Version 4.2.0 and IAR Embedded Workbench Version: 5.10
//******************************************************************************
#include <msp430g2211.h>
void delay(void); // Software delay
void main (void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
CACTL2 = P2CA4; // CA1/P1.1 = +comp
CCTL0 = CCIE; // CCR0 interrupt enabled
TACTL = TASSEL_2 + ID_3 + MC_2; // SMCLK/8, cont-mode
_EINT(); // enable interrupts
while (1) // Loop
{
CACTL1 = 0x00; // No reference voltage
_BIS_SR(LPM0_bits); // Enter LPM0
CACTL1 = CAREF0 + CAON; // 0.25*Vcc, Comp on
_BIS_SR(LPM0_bits); // Enter LPM0
CACTL1 = CAREF1 + CAON; // 0.5*Vcc, Comp on
_BIS_SR(LPM0_bits); // Enter LPM0
CACTL1 = CAREF1 + CAREF0 + CAON; // 0.55V, Comp on
_BIS_SR(LPM0_bits); // Enter LPM0
}
}
// Timer A0 interrupt service routine
#pragma vector=TIMERA0_VECTOR
interrupt void Timer_A (void)
{
_BIC_SR_IRQ(LPM0_bits); // Clear LPM0 bits from 0(SR)
}