thank you so much sir, i have modified my program based on what you said,,,, i have two proble... 1) For a constant dc voltage(2.5V DC) in 12 bit resolution...... i am getting 5-bit(LSB) variabtion 2) For a sine wave input(2.5Vpp AC) in 12bit resolution.... there are missing codes... #include " msp430f5438A .h" #include int main(void) { WDTCTL = WDTPW+WDTHOLD; // Stop watchdog timer P6SEL |= 0x80; // Enable A/D channel A0 PBDIR = PBDIR | 0xFFFF; REFCTL0 = REFMSTR + REFON + REFVSEL_2 + REFTCOFF; /* Initialize ADC12_A */ ADC12CTL0 = ADC12ON+ADC12SHT0_8+ADC12MSC; // Turn on ADC12, set sampling time // set multiple sample conversion ADC12CTL1 = ADC12CSTARTADD_7 + ADC12SHP+ ADC12DIV_0 + ADC12SSEL_3 + ADC12CONSEQ_2; ADC12CTL2 = ADC12RES_2; ADC12MCTL7 = ADC12SREF_1 + ADC12INCH_7; ADC12IE = ADC12IE7; // Enable ADC12IFG.0 ADC12CTL0 |= ADC12ENC; // Enable conversions ADC12CTL0 |= ADC12SC; // Start conversion __bis_SR_register(LPM4_bits + GIE); // Enter LPM4, Enable interrupts __no_operation(); // For debugger } // INTERRUPT VECTORS FOR MSP430 //////////////////////////////////////// #if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__) #pragma vector=ADC12_VECTOR __interrupt void ADC12ISR (void) #elif defined(__GNUC__) void __attribute__ ((interrupt(ADC12_VECTOR))) ADC12ISR (void) #else #error Compiler not supported! #endif { switch(__even_in_range(ADC12IV,34)) { case 0: break; // Vector 0: No interrupt case 2: break; // Vector 2: ADC overflow case 4: break; // Vector 4: ADC timing overflow case 6: break; // Vector 6: ADC12IFG0 case 8: break; // Vector 8: ADC12IFG1 case 10: break; // Vector 10: ADC12IFG2 case 12: break; // Vector 12: ADC12IFG3 case 14: break; // Vector 14: ADC12IFG4 case 16: break; // Vector 16: ADC12IFG5 case 18: break; // Vector 18: ADC12IFG6 case 20: // Vector 20: ADC12IFG7 PBOUT = ADC12MEM7; case 22: break; // Vector 22: ADC12IFG8 case 24: break; // Vector 24: ADC12IFG9 case 26: break; // Vector 26: ADC12IFG10 case 28: break; // Vector 28: ADC12IFG11 case 30: break; // Vector 30: ADC12IFG12 case 32: break; // Vector 32: ADC12IFG13 case 34: break; // Vector 34: ADC12IFG14 default: break; } }
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