STM32: PWM control from UI

HI,

For the PWM output from STM32F4, I am able to set PULSE LENGTH (dutycycle) and FREQUENCY of PWM by changing values in

"TIM_OCInitStructure.TIM_Pulse = TIM_PULSE"

and

"TIM_TimeBaseStructure.TIM_Period = TIM_PERIOD;"

.

In my program, values in TIM_PULSE defines dutycycle and values in TIM_PERIOD defines the frequency.

Next, in-order to develop the user interface control. which means the input values from my GUI should change the values in TIM_PULSE and TIM_PERIOD.

Could you pls give me some coding idea to update these values whenever the user want to change?

My full code:

#define APB2_FREQ 84000000 * 2


#define PWM_FREQAPB2 25000 //20 KHZ

uint8_t Duty2=50;


#define TIM_PRESCALER2 0

#define TIM_PERIOD2 ((APB2_FREQ)/(PWM_FREQAPB2))-1 // Autoreload reg value

#define TIM_PULSE2 ((TIM_PERIOD2 + 1) * Duty2)/ 100 - 1

void TIM_Config(void)
{
        GPIO_InitTypeDef GPIO_InitStructure;

        // Enable TIM10 Clock
         RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM10, ENABLE);    //TIM CHANGE

        // Enable GPIOF Pins that are used for on board LED's
        RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOF, ENABLE);                                                                                           // change 1



        /* Initialise  pins 13, 14 and 15 D - relating to on board LED's*/
         GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 ;
         GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
         GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
         GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
         GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
         GPIO_Init(GPIOF, &GPIO_InitStructure);


        GPIO_PinAFConfig(GPIOF, GPIO_PinSource6, GPIO_AF_TIM10);
}

void PWM_Config()
{

        TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
        TIM_OCInitTypeDef  TIM_OCInitStructure;

// Setup timer defaults
        TIM_TimeBaseStructure.TIM_Period = TIM_PERIOD; //PWM Frequency = 20KHz
        TIM_TimeBaseStructure.TIM_Prescaler = TIM_PRESCALER2;
        TIM_TimeBaseStructure.TIM_ClockDivision = 0;
        TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

        TIM_TimeBaseInit(TIM10, &TIM_TimeBaseStructure);


        /* Configure timer for PWM - channel 1*/
        TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; // Mode-> PWM1 for set, PWM2 for clear
        TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
        TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;

        TIM_OCInitStructure.TIM_Pulse = TIM_PULSE; // dutycycle

        //notice the number 1 in TIM_OC1Init
        TIM_OC1Init(TIM10, &TIM_OCInitStructure);
        TIM_OC1PreloadConfig(TIM10, TIM_OCPreload_Enable);

        TIM_ARRPreloadConfig(TIM10, ENABLE);


        //TIM_ARRPreloadConfig(TIM3, ENABLE);

                /* Start timer*/
        TIM_Cmd(TIM10, ENABLE);
}

void PWM_SetDC(/*uint16_t channel, uint16_t dutycycle*/)
{
        uint16_t channel;
        //uint16_t dutycycle;
        if (channel==1)
        {
                //TIM3->CCR1 = 2000;
        }
        else
        {
        }
}

KINDLE HELP!

How to update TIM_PULSE2 and TIM_PERIOD2 from the User Interface