Group05_Lab06_Task1/Lab6_Task1.c

#include <stdint.h>
#include <stdbool.h>
#include "tm4c123gh6pm.h"

#define mask_bits 0x11          //mask bits for user switch

void GPIOF_config(void);
void GPIOF_Int_Config(void);

void main(void)
    {
    SYSCTL_RCC_R &= ~(1 << 20);   //SYSTEM CLOCK SOURCE FOR 16MHz PWM
    SYSCTL_RCGC0_R |= 0x00100000;   //enable clock for PWM module
    SYSCTL_RCGCPWM_R = 0x3; //

    GPIOF_config();
    GPIOF_Int_Config();
    GPIO_PORTF_AFSEL_R |= 0x02;
    GPIO_PORTF_PCTL_R |= 0x50;

    PWM1_2_CTL_R= 0x00000000;

    PWM1_2_GENB_R |= 0x80E;
    PWM1_2_LOAD_R = 0xA0;

    PWM1_2_CMPB_R = 0x50;
    PWM1_2_CTL_R |=0x01;
    PWM1_ENABLE_R |=(1<<5);

    while(1);

    }

void GPIOF_config()
    {
    SYSCTL_RCGC2_R |= 0x20;
    GPIO_PORTF_LOCK_R = 0x4C4F434B;
    GPIO_PORTF_CR_R = 0x1F;
    GPIO_PORTF_DEN_R= 0x1F;
    GPIO_PORTF_DIR_R= 0x0E;
    GPIO_PORTF_PUR_R = 0x11;

    }

void GPIOF_Int_Config()
    {
    GPIO_PORTF_IM_R &= ~mask_bits;
    GPIO_PORTF_IS_R &= ~mask_bits;
    GPIO_PORTF_IEV_R &= ~mask_bits;
    GPIO_PORTF_IBE_R &= ~mask_bits;
    NVIC_PRI7_R = (NVIC_PRI7_R & 0xFF1FFFFF) | (2 << 21);
    NVIC_EN0_R |= (1 << 30);
    GPIO_PORTF_ICR_R = mask_bits;
    GPIO_PORTF_IM_R |= mask_bits;

    }

void GPIOF_INT_Handler(void)
    {
        GPIO_PORTF_IM_R &= ~mask_bits;
        int i;
        if(GPIO_PORTF_RIS_R & 0x01)
            {
            for(i=0;i<160000;i++){}

            if(~(GPIO_PORTF_DATA_R)&0x01)
                {
                if(PWM1_2_CMPB_R < 155)
                    {
                    PWM1_2_CMPB_R += 5;
                    }
                }
            }

        if(GPIO_PORTF_RIS_R & 0x10)
            {
            for(i=0;i<160000;i++){}
            if(~(GPIO_PORTF_DATA_R)&0x10)
                {
                if(PWM1_2_CMPB_R > 5)
                    {
                    PWM1_2_CMPB_R -= 5;
                    }
                }
            }
        GPIO_PORTF_ICR_R = mask_bits;
        GPIO_PORTF_IM_R |= mask_bits;

    }