Hello everyone,
I want to control the led brightness with potentiometer. I take analog input from P1.3 pin, the arrange the duty cycle according to digital equivalent of measured analog data.
Our ADC10MEM has 10-bit so max decimal value of this register is 1023. Considering this information I set the period 1023 (TA0CCR0 = 1023). By this way, brightness will max level when I arrange the max voltage in pot.
However my code does not work. Can anyone help me where I am wrong ?
#include <msp430.h>
int main(void)
{
WDTCTL = WDTPW | WDTHOLD; // stop watchdog timer
BCSCTL1 = CALBC1_1MHZ; // Set range
DCOCTL = CALDCO_1MHZ; // Set DCO step + modulation
// -- Port Setup
P1DIR |= BIT6; // Assign P1.6 as output
P1OUT &= ~BIT6; // Turn green led off
P1DIR |= BIT6; // Set P1.6 as output
P1SEL |= BIT6; // P1.6 selected Timer0_A Out1
// -- Timer0_A Setup
TA0CCR0 |= 1023; // PWM Period
TA0CCTL1 |= OUTMOD_7; // TA0CCR1 output mode = 7
TA0CCR1 |= 511; // TA0CCR1 PWM duty cycle (Initiliaze)
TA0CTL |= TASSEL_2 + ID_2 + MC_1 + TACLR + TAIE ; // SMCLK, Up Mode
// -- ADC Setup
ADC10CTL0 |= ADC10ON + ADC10IE; // ADC10 active and interrupt enable
ADC10CTL1 |= INCH_3 + ADC10DIV_7 + ADC10SSEL_3 ; // ADC10CLK = SMCLK / 8
ADC10AE0 |= INCH_3; // Channel 0 analog input enable
ADC10CTL0 |= ENC + ADC10SC; // Start Conversion
_BIS_SR(LPM0_bits +GIE);
}
#pragma vector = ADC10_VECTOR
__interrupt void adc10_interrupt(void){
TA0CCR1 = ADC10MEM;
ADC10CTL0 |= ENC + ADC10SC; // Start Conversion Again
}
#include <msp430.h>
int main(void){ WDTCTL = WDTPW | WDTHOLD; // stop watchdog timer BCSCTL1 = CALBC1_1MHZ; // Set range DCOCTL = CALDCO_1MHZ; // Set DCO step + modulation
// -- Port Setup
P1DIR |= BIT6; // Assign P1.6 as output P1OUT &= ~BIT6; // Turn green led off
P1DIR |= BIT6; // Set P1.6 as output P1SEL |= BIT6; // P1.6 selected Timer0_A Out1
// -- Timer0_A Setup
TA0CCR0 |= 1023; // PWM Period TA0CCTL1 |= OUTMOD_7; // TA0CCR1 output mode = 7 TA0CCR1 |= 511; // TA0CCR1 PWM duty cycle (Initiliaze) TA0CTL |= TASSEL_2 + ID_2 + MC_1 + TACLR + TAIE ; // SMCLK, Up Mode // -- ADC Setup
ADC10CTL0 |= ADC10ON + ADC10IE; // ADC10 active and interrupt enable ADC10CTL1 |= INCH_3 + ADC10DIV_7 + ADC10SSEL_3 ; // ADC10CLK = SMCLK / 8 ADC10AE0 |= INCH_3; // Channel 0 analog input enable ADC10CTL0 |= ENC + ADC10SC; // Start Conversion _BIS_SR(LPM0_bits +GIE);
}
#pragma vector = ADC10_VECTOR __interrupt void adc10_interrupt(void){
TA0CCR1 = ADC10MEM; ADC10CTL0 |= ENC + ADC10SC; // Start Conversion Again }
