Other Parts Discussed in Thread: MSP430G2553
I've been working on some code that will eventually put out an analog drive voltage, (using PWM and a low pass filter), and read in a few analog inputs. Right now it just produces a drive voltage, measures it using the ADC, and then outputs back the mirror image to make sure the ADC read everything. Whenever I tested my code with all the ADC references taken out, it worked fine. In fact, it still works perfectly fine if I comment out this one line:
voltage[i] = ADC10MEM;
Does anyone know why this line is preventing the for loop its in from completing and causing it to reset? (Note: I'm monitoring the output using a digital oscilloscope and the microcontroller is a MSP430G2553). The voltage array is an array of ints. For completeness here is the for loop:
for (i=499, k=0;i>=0;i--){
CCR1=i<<1;
//delay to allow the filter and capacitance in solar panel to stabilize
for (j=1000;j>0;j--);
ADC10CTL0 |= ADC10SC; //Sampling and conversion start
voltage[i] = ADC10MEM;
}
And here is the whole code:
#include <msp430g2553.h>
/*
* main.c
*/
void ConfigureAdc(void); //prototype for function that configures ADC, taken from
//enrico::garante, http://www.egarante.net/2011/05/msp430-launchpad-tutorial-part-3-adc.html
int main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop watchdog timer
//Arrays to hold data points
int voltage[500];
//float current[500];
//Voltage divider for measuring voltage of panel, shunt resistor for measuring current
float voltageDivider=11.1;
float shuntResistor=0.1;
int i, j, k=-1; //counting variables
//Sum of readings to be averaged
float voltageSum, currentSum;
/******************DRIVE VOLTAGE SECTION******************/
P1DIR |= BIT6; //P1.6 to output
P1SEL |= BIT6; //P1.6 to timer output bit TA0.1
CCR0 = 1000-1; //PWM Period
CCTL1 = OUTMOD_7; //CCR1 reset/set
CCR1 = 1000; //CCR1 PWM duty cycle
TACTL = TASSEL_2 + MC_1; //SMCLK, up mode
/*****************ADC SECTION****************************/
BCSCTL1 = CALBC1_1MHZ; //Set range
DCOCTL = CALDCO_1MHZ;
BCSCTL2 &= ~(DIVS_3); //SMCLK=DCO=1MHz
P1SEL |= BIT5; //ADC input pin P1.5
ConfigureAdc ();
ADC10CTL0 |= ENC; //ADC enable
/****************EXECUTION SECTION*******************/
for (i=499, k=0;i>=0;i--){
CCR1=i<<1;
//delay to allow the filter and capacitance in solar panel to stabilize
for (j=1000;j>0;j--);
ADC10CTL0 |= ADC10SC; //Sampling and conversion start
voltage[i] = ADC10MEM;
}
CCR1 = 1000;
for (i=499, k=1; i>=0; i--){
CCR1=voltage[i];
for (j=1000;j>0;j--);
}
k++;
CCR1 = 1000;
while(1);
return 0;
}
void ConfigureAdc (void)
{
ADC10CTL1 = INCH_5 + ADC10DIV_3; //Channel 5, ADC10CLK/4
ADC10CTL0 = SREF_0 + ADC10SHT_3 + ADC10ON + ADC10IE; //Vcc and Vss as reference
ADC10AE0 |= BIT5; //P1.5 ADC option
}
