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
