Hi folks.
I am having an issue where my MSP430G2432 gets stuck on the line of code where I am trying to disable ADC conversion ("ADC10CTL0 &= ~ENC;") - at least according to the debugger. This happens right after the ADC finishes a repeat single channel conversion and exits low power mode via an ISR. If I hit "Resume" after entering debug mode, and then pause later on, it always is on this line. Also, it will not let me single step past this point. My code is below. The code is essentially taking a large number of samples and summing them so I can get the average.
If anyone has any thoughts, I would appreciate the input. I'm afraid the solution is obvious, but I haven't had any luck finding it.
Thanks!
#include <msp430.h>
#include <stdint.h>
// Multiply to get the total num of samples (e.g., 32*64=2048)
#define NUM_SAMPLES 32
#define SAMPLES_MULTIPLIER 64
uint8_t count = 0;
uint16_t samples[NUM_SAMPLES];
uint32_t sum = 0;
void config() {
DCOCTL = CALDCO_8MHZ; // Make the uP run at 8MHz
BCSCTL1 = CALBC1_8MHZ; // Make the uP run at 8MHz
BCSCTL2 = 0; // DCO is MCLK source, MCLK/1, DCO is SMCLK source, SMCLK/1, DCOR not available
BCSCTL3 = LFXT1S_2; // XT2 00, VLO is ACLK source, XCAP 00, XT2OF 0, LFXT1 0
// ADC
ADC10CTL0 = SREF_7 + ADC10SHT_1 + MSC + ADC10ON + ADC10IE;
ADC10CTL1 = CONSEQ_2 + INCH_0 + ADC10DIV_3 + ADC10SSEL_3;
ADC10DTC1 = NUM_SAMPLES; // 32 (0x20) conversions
P1DIR &= ~BIT0; // Set P1.0 to input direction
ADC10AE0 |= BIT0; // Select P1.0 for ADC to sample
}
int main(void) {
WDTCTL = WDTPW | WDTHOLD; // Stop watchdog timer
config();
_EINT();
while(1) {
ADC10CTL0 |= ENC + ADC10SC; // Enable Conversion and conversion start
__bis_SR_register(CPUOFF + GIE); // LPM0, ADC10_ISR
ADC10CTL0 &= ~ENC; // Disable Conversion - GETS STUCK HERE
while (ADC10CTL1 & BUSY); // Wait if ADC10 busy
ADC10SA = (uint16_t)samples; // Transfers data to next array (DTC auto increments address)
uint8_t i;
for (i = 0; i < NUM_SAMPLES; i++) {
sum += samples[i];
}
if (count == SAMPLES_MULTIPLIER-1) {
save_sum(sum); // Not really what happens here, but this part is irrelevant to the question.
sum = 0;
count = 0;
} else {
count++;
}
}
}
// ADC10 interrupt service routine
#pragma vector=ADC10_VECTOR
__interrupt void ADC10_ISR(void) {
__bic_SR_register_on_exit(CPUOFF);
}
