#include "..//tm4c123gh6pm.h"
#include "PWM1.h"

// ***************** Timer0_Init ****************
// Activate TIMER0 interrupts to run user task periodically
// Inputs:  task is a pointer to a user function
//          period in units (1/clockfreq)
// Outputs: none
#define RED_LED         0x2
#define BLUE_LED        0x4
#define GREEN_LED       0x8

#define TAPWMIE         (1 << 9)
#define TAAMS           (1 << 3)
#define TACMR           0x02
#define TAMR                (1 << 1)
#define TAWPML          (1 << 6)
#define TAPLO         (1 << 11)
#define TAWOT               (1 << 6)
#define TAMIE               (1 << 5)
//Interrupts defines
 //GPTM Timer A Match Interrupt Mask
#define TATOIM          (1 << 0) //GPTM Timer A Time-Out Interrupt Mask
#define TAMIM               (1 << 4)

extern void DisableInterrupts(void); // Disable interrupts
extern void EnableInterrupts(void);  // Enable interrupts
extern void WaitForInterrupt(void);  // low power mode


static const unsigned long LED[] = {RED_LED , BLUE_LED, GREEN_LED, 0x0};
void configureInterruptPWM()
{
  NVIC_PRI5_R       = (NVIC_PRI5_R&0xFFFFFF00) | 0x00000000; // 8) priority 4
  NVIC_EN0_R            = (1<<19);           // 9) enable IRQ 19 in NVIC
}

volatile unsigned long ledNR = 0;

void nextLED(void)
{
        ledNR++;
}
void previousLED(void)
{
        ledNR--;
}
void PWM1_Init(unsigned long longSignal){
    configureInterruptPWM();

  SYSCTL_RCGCTIMER_R |= 0x01;   // 0) activate TIMER0
  TIMER0_CTL_R &= ~0x00000001;    // 1) disable TIMER0A during setup

  TIMER0_CFG_R           = 0x00;                                        // 2) configure for 32-bit mode
    TIMER0_TAMR_R      = 0x02 | TAMIE;   // 3) configure for periodic mode, default down-count settings;
  TIMER0_TAPR_R          = 0x0;
    TIMER0_TAPMR_R       = 0x0001;
    TIMER0_TAILR_R       = 0x0ffff;
    TIMER0_TAMATCHR_R  = 0xf;
  TIMER0_ICR_R           = TIMER_ICR_TAMCINT | TIMER_ICR_TATOCINT;    // 6) clear TIMER0A timeout flag
    TIMER0_IMR_R             = TATOIM | TAMIM;

  TIMER0_CTL_R |= 0x00000001;    // 10) enable TIMER0A
}

void Timer0A_Handler(void)
{
    //Timeout
    unsigned long myLed = ledNR & 3;
    if (TIMER0_RIS_R & 0x1)
    {
        NVIC_EN0_R = (1<<30);
        TIMER0_ICR_R = TIMER_ICR_TATOCINT;// acknowledge TIMER1A timeout
        DisableInterrupts();
        GPIO_PORTF_DATA_R |= LED[myLed];
        EnableInterrupts();
        //GPIO_PORTF_DATA_R |= LED[0];
        //GPIO_PORTF_DATA_R |= LED[1];
    }   //Match
    else if (TIMER0_RIS_R & (1 << 4))
    {
        TIMER0_ICR_R = TIMER_ICR_TAMCINT;
        DisableInterrupts();
        GPIO_PORTF_DATA_R &= ~(LED[myLed]);
        EnableInterrupts();
        //GPIO_PORTF_DATA_R &= ~(LED[0]);
        //GPIO_PORTF_DATA_R &= ~(LED[1]);
    }
}