__interrupt void Timer_A (void)
{
if (TACCR1 <= 40) {
i++;
if (i > 500) {
set_PWM_duty_cycle(TACCR1 + 1);
P1IFG = 0x00;
i = 0x00;
// CCR0 += 50; // Add Offset to CCR0
}
}
if (TACCR1 == 41) {
set_PWM_duty_cycle(0);
P1IFG = 0x00;
i = 0x00;
}
}
/** Initializes PWM signal on PE4 in order to control backlight of LCD
**/
void PWM_init(void)
{
SYSCTL->RCGC0 |= (1UL << 20);
//SYSCTL->RCGC2 |= (1UL << 4);
GPIOE->AFSEL |= (1UL << 4); // Alternate function
GPIOE->PCTL |= (0x4 << 16); // Select M0PWM4
SYSCTL->RCC |= (0x0 << 17); // Divide system clock by 2 for PWM (8MHz)
// Configure PWM Module 0, Generator 2, Generator A: PWM0->_2_...
PWM0->_2_CTL = 0x0; // No global sync
PWM0->_2_GENA = 0x8C; // Drive PWM high when counter matches LOAD, drive PWM low when counter matches CMPA
PWM0->_2_LOAD = PWM_LOAD; //Set the load to be 399 (400)
set_PWM_duty_cycle(100); // Set 100% duty cycle
PWM0->_2_CTL = 0x1; // Enable PWM Module 0, Generator 2
PWM0->ENABLE |= (1UL << 4); // Enabled
}
int main( void )
{
// Stop watchdog timer to prevent time out reset
WDTCTL = WDTPW + WDTHOLD;
// timerA_start(timing, OUTMOD_SET_RESET); // starte PWM
INIT_PORTS();
// INIT_ADC();
// init_XT2();
init_PWM_TimerA();
set_PWM_duty_cycle(0);
P1OUT |= LED_PWR_ON;
P1OUT |= LED2;
//_BIS_SR(LPM3_bits);
_BIS_SR(LPM0_bits + GIE); // Enter LPM0 w/ interrupt
// while(1) // warte bis sich was tut
// {
// }
// return 0;
}
/** Handler for GPIOF pins (push buttons)
* Increment/decrement scroll speed
* Increment/decrement backlight brightness
**/
void GPIOF_Handler(void)
{
// If Interrupt caused by PF4
if(GPIOF->RIS & (1UL << 4))
{
GPIOF->DATA ^= (1UL << 3); // Toggle LED for debugging
increment_scroll_delay();
decrement_brightness();
GPIOF->ICR |= (1UL << 4); // Clear Interrupt
}
// Else if Interrupt caused by PF0
else if (GPIOF->RIS & (1UL << 0))
{
GPIOF->DATA ^= (1UL << 3); // Toggle LED for debugging
decrement_scroll_delay();
increment_brightness();
GPIOF->ICR |= (1UL << 0); // Clear Interrupt
}
interrupt_timer(scroll_delay);
set_PWM_duty_cycle(duty_cycle);
}
