这是一个用通道5的
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* MSP430 CODE EXAMPLE DISCLAIMER
*
* MSP430 code examples are self-contained low-level programs that typically
* demonstrate a single peripheral function or device feature in a highly
* concise manner. For this the code may rely on the device's power-on default
* register values and settings such as the clock configuration and care must
* be taken when combining code from several examples to avoid potential side
* effects. Also see www.ti.com/grace for a GUI- and www.ti.com/msp430ware
* for an API functional library-approach to peripheral configuration.
*
* --/COPYRIGHT--*/
//*****************************************************************************
// 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
// --|RST XOUT|-
// | |
// |A5+ | ( A5+, A5- connected internally )
// |A5- |
// | |
// | VREF |---+
// | | |
// | | -+- 100nF
// | | -+-
// | | |
// | AVss |---+
// | |
//
// L. Westlund / S. Karthikeyan
// Texas Instruments Inc.
// June 2005
// Built with CCE Version: 3.2.0 and IAR Embedded Workbench Version: 3.30A
//*****************************************************************************
#include <msp430.h>
#define LOW_BAT 0xBFFF // ~3V
static unsigned int ADCresult;
int 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
__enable_interrupt(); // Enable general interrupts
while (1)
{
SD16CCTL0 |= SD16SC; // Set bit to start conversion
__bis_SR_register(LPM0_bits); // Enter LPM0
if( ADCresult < LOW_BAT )
{
P1OUT |= 0x01;
}
else
{
P1OUT &= ~0x01;
}
__no_operation(); //SET BREAKPOINT HERE
}
}
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=SD16_VECTOR
__interrupt void SD16ISR(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(SD16_VECTOR))) SD16ISR (void)
#else
#error Compiler not supported!
#endif
{
switch (SD16IV)
{
case 2: // SD16MEM Overflow
break;
case 4: // SD16MEM0 IFG
ADCresult = SD16MEM0; // Save results (clears IFG)
break;
}
__bic_SR_register_on_exit(LPM0_bits); // Exit LPM0
}
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