Posted on October 30, 2013 at 10:19/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
void CLK_Configuration(void);
void GPIO_Configuration(void);
void EXIT_Configuration(void);
void TIM1_Configuration(void);
void Delay(u16 Delay_DAT);
u32 TIM1ClockFreq = 4000000;
u8 TIM1_OVER_FLOW, START_CHECK_TIME;
u16 TIME_CAPTURE;
u32 FREQUENCY;
float SPEED_RPM;
void main(void)
{
CLK_Configuration();
TIM1_Configuration();
GPIO_Configuration();
EXIT_Configuration();
enableInterrupts();
/* Infinite loop */
while (1)
{
if(TIM1_OVER_FLOW==0){
FREQUENCY = TIM1ClockFreq/((u32)TIME_CAPTURE*64);
SPEED_RPM = (TIM1ClockFreq*60)/((u32)TIME_CAPTURE*64);
}
else {
FREQUENCY=0;
SPEED_RPM=0;
}
}
}
void CLK_Configuration(void)
{
CLK->CKDIVR = 0x10; // Internal 4MHz
}
void GPIO_Configuration(void)
{
/* GPIOD PD7 is input floating */
GPIOB->DDR &=0xfd;
GPIOB->CR1 |=0x02; // floating input
GPIOB->CR2 |=0x02; // PB1 enable interrupt
}
void EXIT_Configuration(void)
{
sim(); // CCR I1 and I0 = 1
EXTI->CR2 = 0x00; //TL interrupt Falling edge only
EXTI->CR1 = 0x08;
}
void TIM1_Configuration(void)
{
/*--------------------------------
Prescaler+1 * Autoreload
time = ----------------------
4MHz
--------------------------------*/
/* Set the Autoreload value */
TIM1->ARRH = 0xff;
TIM1->ARRL = 0xff;
TIM1->CNTRH = 0;
TIM1->CNTRL = 0;
/* Set the Prescaler value */
TIM1->PSCRH = 0; // Prescaler = 1 => 64
TIM1->PSCRL = 63;
/* Update interrupt enable */
TIM1->IER |= 0x01;
//enableInterrupts();
/* TIM1 Counter enable */
TIM1->CR1 |= 0x01;
}
void Software_Priority(void)
{
ITC->ISPR4 &= 0xf3; // TIM2 Update/overflow Level 2 (0 0)
ITC->ISPR4 &= 0x7f; // TIM3 Update/overflow Level 1 (0 1)
}
void Delay(u16 Delay_DAT)
{
static u8 i;
static u16 j;
for(j=0;j<Delay_DAT;j++){
for(i=0;i<255;i++);
}
}
