CCS/MSP-TS430DA38: MSP430F2252

Hi Siranjeevi,

- Can you please link the code example you are referencing?
- Is your question if the code example can be accomplished without the interrupt?

Best,
-Chris

1. this is my project code i want to change polling method with out interrupt

#include <msp430.h>

int chkAcInput(void);
unsigned short int ACInputVoltage (void);
int chkAcI(void);
void ADC_init(void);
void i2c_init(void);

#define CLOCK_FREQ 16000000

#define LED_ACIN 0x01 //P1.0

char AC_FLAG=0, ac_Val=0;

unsigned int RxByteCtr;
unsigned int RxWord;

int main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
if (CALBC1_16MHZ==0xFF) // If calibration constant erased
{
while(1); // do not load, trap CPU!!
}
DCOCTL = 0; // Select lowest DCOx and MODx settings
BCSCTL1 = CALBC1_16MHZ; // Set DCO
DCOCTL = CALDCO_16MHZ;
P1DIR |= 0x01;
P1OUT |= ~LED_ACIN;
while(1)
{
ac_Val = ACInputVoltage();
}
}
/*-----------------------------------ADC_value_Comparesion_with_Volt-------------------------------------------------*/
unsigned short int ACInputVoltage(void)
{

unsigned short int AcV_flag = 0;
float ac_real, ac_ref=3.592;

i2c_init();

RxByteCtr = 1; // Load RX byte counter
UCB0CTL1 |= UCTXSTT; // I2C start condition
__bis_SR_register(CPUOFF + GIE); // Enter LPM0, enable interrupts

ac_real=(RxWord/ac_ref);
AcV_flag=(int)ac_real;
return(AcV_flag);
}

/*-----------------------------------I2C_setup-------------------------------------------------*/
void i2c_init(void)
{
P1DIR |= 0x01; // P1.0 output
P3SEL |= 0x06; // Assign I2C pins to USCI_B0
UCB0CTL1 |= UCSWRST; // Enable SW reset
UCB0CTL0 = UCMST + UCMODE_3 + UCSYNC; // I2C Master, synchronous mode
UCB0CTL1 = UCSSEL_2 + UCSWRST; // Use SMCLK, keep SW reset
UCB0BR0 = 12; // fSCL = SMCLK/12 = ~100kHz
UCB0BR1 = 0;
UCB0I2CSA = 0x48; // Set slave address
UCB0CTL1 &= ~UCSWRST; // Clear SW reset, resume operation
IE2 |= UCB0RXIE; // Enable RX interrupt
}

// The USCIAB0TX_ISR is structured such that it can be used to receive any
// 2+ number of bytes by pre-loading RxByteCtr with the byte count.
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector = USCIAB0TX_VECTOR
__interrupt void USCIAB0TX_ISR(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(USCIAB0TX_VECTOR))) USCIAB0TX_ISR (void)
#else
#error Compiler not supported!
#endif
{
RxByteCtr--;
RxWord |= UCB0RXBUF; // Get final received byte,
if (RxByteCtr == 1) // Only one byte left?
{
UCB0CTL1 |= UCTXSTP; // Generate I2C stop condition
__bic_SR_register_on_exit(CPUOFF); // Exit LPM0
}
}

2) i want to change polling method for without interrupt.