Hi,
I'm trying to read 2 channels form ADC. The problem is that I get the value of one of them (ADC12MEM0) but the other one is not correct, it keeps constant (ADC12MEM1). I searched in other similar threads and my code seems to be okay. The conversion is started through a timer.
#include <msp430.h> #include <stdio.h> #include <stdlib.h> #include <math.h> volatile unsigned int result = 0; int main(void) { WDTCTL = WDTPW | WDTHOLD; // Stop WDT // GPIO Setup P1SEL1 |= BIT0; // Configure P.1.0 for ADC P1SEL0 |= BIT0; P1SEL1 |= BIT1; // Configure P1.1 for ADC P1SEL0 |= BIT1; // Disable the GPIO power-on default high-impedance mode to activate // previously configured port settings PM5CTL0 &= ~LOCKLPM5; // Configure ADC12 ADC12CTL0 = ADC12SHT0_2 | ADC12ON; ADC12CTL1 = ADC12SHP; // ADCCLK = MODOSC; sampling timer ADC12CTL2 |= ADC12RES_2; // 12-bit conversion results ADC12IER0 |= ADC12IE0; // Enable ADC conv complete interrupt ADC12MCTL0 |= ADC12INCH_0; // A0 ADC input select; Vref=AVCC // PRESSURE ADC12MCTL1 |= ADC12INCH_1+ADC12EOS; // A1 ADC input select; Vref=AVCC // TEMPERATURE // TIMER CONFIGURATION WDTCTL = WDTPW | WDTHOLD; // Stop WDT // Disable the GPIO power-on default high-impedance mode to activate // previously configured port settings PM5CTL0 &= ~LOCKLPM5; /********** TIMER ***********/ TA0CCTL0 = CCIE; // TACCR0 interrupt enabled //TA0CCR0 = 50000; TA0CCR0 = 32768/2; TA0CTL = TASSEL_1 | MC__CONTINOUS; // He cambiado al ACLK->32768 Hz (antes SMCLK), continuous mode __bis_SR_register(LPM0_bits | GIE); // Enter LPM0 w/ interrupt. Aquí salta la interrupción __no_operation(); // For debugger while(!(REFCTL0 & REFGENRDY)); // Wait for reference generator // to settle __bis_SR_register(LPM0_bits + GIE); // LPM0, ADC10_ISR will force exit __no_operation(); // For debug only } // Timer0_A0 interrupt service routine #if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__) #pragma vector = TIMER0_A0_VECTOR __interrupt void Timer0_A0_ISR (void) #elif defined(__GNUC__) void __attribute__ ((interrupt(TIMER0_A0_VECTOR))) Timer0_A0_ISR (void) #else #error Compiler not supported! #endif { TA0CCR0 += 32768/2; ADC12CTL0 |= ADC12ENC | ADC12SC; // Sampling and conversion start __bis_SR_register(LPM0_bits + GIE); // LPM0, ADC10_ISR will force exit __no_operation(); // For debug only } // ADC interrupt service routine #if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__) #pragma vector = ADC12_B_VECTOR __interrupt void ADC12_ISR(void) #elif defined(__GNUC__) void __attribute__ ((interrupt(ADC12_B_VECTOR))) ADC12_ISR (void) #else #error Compiler not supported! #endif { switch (__even_in_range(ADC12IV, ADC12IV__ADC12RDYIFG)) { float volt; float resistance; float pressure; case ADC12IV__NONE: break; // Vector 0: No interrupt case ADC12IV__ADC12OVIFG: break; // Vector 2: ADC12MEMx Overflow case ADC12IV__ADC12TOVIFG: break; // Vector 4: Conversion time overflow case ADC12IV__ADC12HIIFG: break; // Vector 6: ADC12BHI case ADC12IV__ADC12LOIFG: break; // Vector 8: ADC12BLO case ADC12IV__ADC12INIFG: break; // Vector 10: ADC12BIN case ADC12IV__ADC12IFG0: // Vector 12: ADC12MEM0 Interrupt // PRESSURE result = ADC12MEM0; printf("Resultado presion: %d\n",result); result = ADC12MEM1; printf("Resultado temperatura: %d\n",result); __bic_SR_register_on_exit(LPM0_bits); // Exit active CPU break; // Clear CPUOFF bit from 0(SR) case ADC12IV__ADC12IFG1: break; // Vector 14: ADC12MEM1 // TEMPERATURE case ADC12IV__ADC12IFG2: break; // Vector 16: ADC12MEM2 case ADC12IV__ADC12IFG3: break; // Vector 18: ADC12MEM3 case ADC12IV__ADC12IFG4: break; // Vector 20: ADC12MEM4 case ADC12IV__ADC12IFG5: break; // Vector 22: ADC12MEM5 case ADC12IV__ADC12IFG6: break; // Vector 24: ADC12MEM6 case ADC12IV__ADC12IFG7: break; // Vector 26: ADC12MEM7 case ADC12IV__ADC12IFG8: break; // Vector 28: ADC12MEM8 case ADC12IV__ADC12IFG9: break; // Vector 30: ADC12MEM9 case ADC12IV__ADC12IFG10: break; // Vector 32: ADC12MEM10 case ADC12IV__ADC12IFG11: break; // Vector 34: ADC12MEM11 case ADC12IV__ADC12IFG12: break; // Vector 36: ADC12MEM12 case ADC12IV__ADC12IFG13: break; // Vector 38: ADC12MEM13 case ADC12IV__ADC12IFG14: break; // Vector 40: ADC12MEM14 case ADC12IV__ADC12IFG15: break; // Vector 42: ADC12MEM15 case ADC12IV__ADC12IFG16: break; // Vector 44: ADC12MEM16 case ADC12IV__ADC12IFG17: break; // Vector 46: ADC12MEM17 case ADC12IV__ADC12IFG18: break; // Vector 48: ADC12MEM18 case ADC12IV__ADC12IFG19: break; // Vector 50: ADC12MEM19 case ADC12IV__ADC12IFG20: break; // Vector 52: ADC12MEM20 case ADC12IV__ADC12IFG21: break; // Vector 54: ADC12MEM21 case ADC12IV__ADC12IFG22: break; // Vector 56: ADC12MEM22 case ADC12IV__ADC12IFG23: break; // Vector 58: ADC12MEM23 case ADC12IV__ADC12IFG24: break; // Vector 60: ADC12MEM24 case ADC12IV__ADC12IFG25: break; // Vector 62: ADC12MEM25 case ADC12IV__ADC12IFG26: break; // Vector 64: ADC12MEM26 case ADC12IV__ADC12IFG27: break; // Vector 66: ADC12MEM27 case ADC12IV__ADC12IFG28: break; // Vector 68: ADC12MEM28 case ADC12IV__ADC12IFG29: break; // Vector 70: ADC12MEM29 case ADC12IV__ADC12IFG30: break; // Vector 72: ADC12MEM30 case ADC12IV__ADC12IFG31: break; // Vector 74: ADC12MEM31 case ADC12IV__ADC12RDYIFG: break; // Vector 76: ADC12RDY default: break; } }
Is there something I'm missing?
Thanks in advance,
Alberto