MSP432 Timer in PWM mode, duty cycle adjustment

Hello!

My name is Aleks and I have the following problem:

I purchased a MSP432 launchpad and wrote a code that is basically reading an ADC value on one pin and uses the value to calculate a duty cycle for a pwm output pin. My problem is that when I use the provided example code from the resources browser for the MSP432 and modify it to my purpose that a change in duty cycle not only changes the duty cycle but also the frequency. I modified the example code to be not interrupt based and put my functions in the endless loop in main:

/* DriverLib Includes */
#include "driverlib.h"

/* Standard Includes */
#include <stdint.h>

#include <stdbool.h>

/* Statics */
static volatile uint16_t curADCResult;
static volatile float normalizedADCRes;

/* Timer_A PWM Configuration Parameter */
Timer_A_PWMConfig pwmConfig =
{
TIMER_A_CLOCKSOURCE_SMCLK,
TIMER_A_CLOCKSOURCE_DIVIDER_1,
1000,
TIMER_A_CAPTURECOMPARE_REGISTER_0,
TIMER_A_OUTPUTMODE_SET_RESET,
1000
};

int main(void)
{
/* Define variables */
volatile uint32_t ii;
volatile int htime = 0;
volatile int ltime = 0;
volatile unsigned int a = 0;

/* Halting the Watchdog */
MAP_WDT_A_holdTimer();

/* Setting DCO to 48MHz */
MAP_PCM_setPowerState(PCM_AM_LDO_VCORE1);
MAP_CS_setDCOCenteredFrequency(CS_DCO_FREQUENCY_48);

/* Enabling the FPU for floating point operation */
MAP_FPU_enableModule();
MAP_FPU_enableLazyStacking();

/* Initializing ADC (MCLK/1/4) */
MAP_ADC14_enableModule();
MAP_ADC14_initModule(ADC_CLOCKSOURCE_MCLK, ADC_PREDIVIDER_1, ADC_DIVIDER_8,0);

/* Remapping TACCR0 to P2.1 to see output on green LED */
const uint8_t port_mapping[] ={PM_TA0CCR0A, PM_TA0CCR0A, PM_TA0CCR0A, PM_NONE, PM_NONE, PM_NONE, PM_NONE, PM_NONE};
MAP_PMAP_configurePorts((const uint8_t *) port_mapping, P2MAP, 1, PMAP_DISABLE_RECONFIGURATION);

/* Configuring GPIOs (ADC: p4.7, Timer-PWM-pin: P2.1) */
MAP_GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_P4, GPIO_PIN7,GPIO_TERTIARY_MODULE_FUNCTION);
MAP_GPIO_setAsPeripheralModuleFunctionOutputPin(GPIO_PORT_P2, GPIO_PIN1,GPIO_PRIMARY_MODULE_FUNCTION);

/* Configuring ADC Memory */
MAP_ADC14_configureSingleSampleMode(ADC_MEM0, true);
MAP_ADC14_configureConversionMemory(ADC_MEM0, ADC_VREFPOS_AVCC_VREFNEG_VSS,ADC_INPUT_A6, false);

/* Configuring Sample Timer */
MAP_ADC14_enableSampleTimer(ADC_MANUAL_ITERATION);

/* Enabling/Toggling Conversion */
MAP_ADC14_enableConversion();
MAP_ADC14_toggleConversionTrigger();

while (1)
{
curADCResult = MAP_ADC14_getResult(ADC_MEM0);
normalizedADCRes= (curADCResult * 3.3) / 16384;

if (normalizedADCRes>0.7)
a = 100 - normalizedADCRes*30.5;
else
a = 32000;

pwmConfig.dutyCycle = a;
MAP_Timer_A_generatePWM(TIMER_A0_MODULE, &pwmConfig);
MAP_ADC14_toggleConversionTrigger();
}
}

Can you tell me what I'm missing here, I just want the duty cycle to be changed without changing the frequency of the PWM signal.

Thank you in advance and best regards!

Aleks