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RGB control with TIMER A and PWM

enstrum

New Coder
Hello, I am currently trying to control an RGB LED's color by using 3 potientiometers with an MSP430 (Turning one would control red, turning the second would control green). How can I code the Timer A module to use PWM on the three rgb pins? Thank you!

C:
//ADC
int VALUE; // Integer variable "VALUE" declared
int DELAY; // Integer variable "DELAY" declared
int Map;

/*  MAIN FUNCTION *****************************************************/
int main(void) {
    int32_t  longResult;
    uint32_t tmp0, tmp1;
    WDTCTL  = WDTPW | WDTHOLD;
    BCSCTL1 = CALBC1_1MHZ;
    DCOCTL  = CALDCO_1MHZ;

    init_Display();


    //init_CounterTimer();

    //RGB
    P1DIR = BIT4 + BIT5 + BIT1; //GREEN input
    P1OUT = BIT4 + BIT5 + BIT1;



    //ADC
    ADC10CTL1 = ADC10CTL1 | INCH_6;     // Pin P1.7 selected as input channel
    ADC10CTL0 = ADC10CTL0 | ADC10ON;    // ADC is turned on and the Sample
    ADC10CTL0 = ADC10CTL0 | ADC10SHT_2; // and Hold Time is extended long
                                            // enough to be able to see the flash

        while(1)       // This is a loop ... "while(TRUE)" keep looping
        {
           for(DELAY = 240; DELAY > 0; DELAY --); // The DELAY has the value of
                                                  // 240 and as long as DELAY is
                                                  // greater than 0 each time thru
                                                  // it gets decremented by 1.
                                                  // When 0 the program continues.
        ADC10CTL0 = ADC10CTL0 | ENC;              // ADC is enabled
        ADC10CTL0 = ADC10CTL0 | ADC10SC;          // ADC starts a converion
        for(DELAY = 240; DELAY > 0; DELAY --); // Same delay as above. Gives it
                                                  // time to place the "VALUE" in
                                                  // the holding register.
        VALUE = ADC10MEM;                         // A number between 0 and 1023 is
                                                  // placed in the holding register
                                                  // "ADC10MEM


        Map = ((VALUE-0)*(255-0)/(1023-0));      ///map value to 255



                                      // P1.1 output
          P1SEL |= BIT1;                            // P1.1 TA1/2 options
          CCR0 = 1000-1;                             // PWM Period
          CCTL1 = OUTMOD_7;                         // CCR1 reset/set
          CCR1 = Map;                               // CCR1 PWM duty cycle
          TACTL = TASSEL_2 + MC_1 + TAIE;                  // SMCLK, up mode, Timer_A interrupt enabled, Timer_A interrupt pending

          _BIS_SR(CPUOFF + GIE);                          // Enter LPM0 with interrupts




        }

return 0;

}
 

zedrummer

New Coder
Hello
Sorry, this won't be exactly an answer to your question, but one to your problem:
Do you really need to rewrite all the code from scratch or use THIS µC?
Because if you use Arduino IDE with a compatible µC (for example a ESP32 which is really powerful and costs less than 4€ in China and less than 10€ anywhere else), you can easily do what you want with less than 15 lines of code.
Getting the "value" of a potentiometer connected to an analog input pin is just
C:
val=analogRead(PIN_NUMBER);
Setting the PWM value of a LED (with a resistor to adapt the voltage) is just (this is a code for a genuine Arduino, but for ESP32 it is not more complicated)
C:
analogWrite(PIN_NUMBER,value);
Check https://docs.arduino.cc/built-in-examples/basics/AnalogReadSerial and https://create.arduino.cc/projecthub/muhammad-aqib/arduino-rgb-led-tutorial-fc003e
If you need more info, don't hesitate
David
 
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