MSP430F423 sigma-delta code

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MSP430F423 sigma-delta code

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MSP430F423 sigma-delta code

作者：佚名文章来源：不详点击数：更新时间：2008-01-06

  //*****************************************************************************
    // MSP430x42x0 Demo - SD16_A, Using the Integrated Battery Sensor
    //
    //Description: This example shows how to use the SD16_A module''s integrated
    //Battery sensor (connected to input channel 5) to measure VCC.
    //A single conversion is initiated and then the CPU is disabled by entering
    //LPM0. Once the conversion has completed, a SD16_A interrupt occurs and
    //stores the result in variable "ADCresult".LED lights if batter is low
    //ACLK = LFXT1 = 32768 Hz, MCLK = SMCLK = DCO = 32 x ACLK = 1048576 Hz
    ////* An external watch crystal on XIN XOUT is required for ACLK *//
    ////* Minimum Vcc is required for SD16_A module - see datasheet*//
    ////* 100nF cap btw Vref and AVss is recommended when using 1.2V ref *//
    //
    //MSP430F4270
    // -----------------
    // / \ XIN -
    // 32kHz
    //-- RSTXOUT -
    //
    // A5+ ( A5+, A5- connected internally )
    // A5-
    //
    // VREF ---+
    //
    // -+- 100nF
    // -+-
    //
    // AVss ---+
    //
    //
    //L. Westlund / S. Karthikeyan
    //Texas Instruments Inc.
    //June 2005
    //Built with IAR Embedded Workbench Version: 3.30A
    //*****************************************************************************
    #include
    #define LOW_BAT 0xBFFF// ~3V
    static unsigned int ADCresult;
    void main(void)
    {
    volatile unsigned int i;// Use volatile to prevent removal
    // by compiler optimization
    P1DIR = 0x01;
    WDTCTL = WDTPW + WDTHOLD; // Stop WDT
    FLL_CTL0 = XCAP14PF; // Configure load caps
    for (i = 0; i < 10000; i++);// Delay for 32 kHz crystal to
    // stabilize
    SD16CTL = SD16REFON+SD16SSEL0;// 1.2V ref, SMCLK
    SD16CCTL0 = SD16SNGL+SD16IE ;// Single conv, enable interrupt
    SD16INCTL0 = SD16INCH_5; // Select Channel A5
    for (i = 0; i < 0x3600; i++); // Delay for 1.2V ref startup
    _EINT();// Enable general interrupts
    while (1)
    {
    SD16CCTL0 = SD16SC;// Set bit to start conversion
    _BIS_SR(LPM0_bits); // Enter LPM0
    if( ADCresult < LOW_BAT )
    {
    P1OUT = 0x01;
    }
    else
    {
    P1OUT &= ~0x01;
    }
    _NOP(); //SET BREAKPOINT HERE
    }
    }
    #pragma vector=SD16_VECTOR
    __interrupt void SD16ISR(void)
    {
    switch (SD16IV)
    {
    case 2: // SD16MEM Overflow
    break;
    case 4: // SD16MEM0 IFG
    ADCresult = SD16MEM0; // Save results (clears IFG)
    break;
    }
    _BIC_SR_IRQ(LPM0_bits); // Exit LPM0
    }

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