Now in this post, I'm going to explain how a timer works in MSP430 and how you can use it for generating PWM.
First of all, between all the MCUs that I have worked with, MSP430 has the easiest setting to activate a timer. To generate PWM, the only thing you need to do is set two number for total time and the duty cycle.
basically the code will be like this:
#include <msp430.h>
/* using Timer A and generate PWM
* code by godman
*/
unsigned int DutyCycle=1650;
void main(void) {
WDTCTL = 0X5A80; // or we can use WDTCTL = WDTPW + WDTHOL
P1DIR = BIT6; //Set P1.6 Output
P1SEL = BIT6; //Set Peripheral Function which is TA1
// set timer value
TACTL = 0x0210; // TA register set, TASSEL_2+ID_0+MC_1+TACLR_0+TAIE_0+TAIFG_0
TACCR0 = 22000; // MCU_FREQ/SERVO_FREQ=1100000/50=22000
TACCTL1 = OUTMOD_6; // set the timer to generating PWM
TACCR1 = DutyCycle; // set duty cycle of PWM 0=550 180=2750
while(1)
{
DutyCycle = 1250; // it set the servo to 90 degree ( my servo works between 0 to 180)
}
}
