#ifndef __INTERVALTIMER_H__
#define __INTERVALTIMER_H__
#include "kinetis.h"
#ifdef __cplusplus
extern "C" {
#endif
class IntervalTimer {
private:
static const uint32_t MAX_PERIOD = UINT32_MAX / (F_BUS / 1000000.0);
public:
IntervalTimer() {
channel = NULL;
nvic_priority = 128;
}
~IntervalTimer() {
end();
}
bool begin(void (*funct)(), unsigned int microseconds) {
if (microseconds == 0 || microseconds > MAX_PERIOD) return false;
uint32_t cycles = (F_BUS / 1000000) * microseconds - 1;
if (cycles < 36) return false;
return beginCycles(funct, cycles);
}
bool begin(void (*funct)(), int microseconds) {
if (microseconds < 0) return false;
return begin(funct, (unsigned int)microseconds);
}
bool begin(void (*funct)(), unsigned long microseconds) {
return begin(funct, (unsigned int)microseconds);
}
bool begin(void (*funct)(), long microseconds) {
return begin(funct, (int)microseconds);
}
bool begin(void (*funct)(), float microseconds) {
if (microseconds <= 0 || microseconds > MAX_PERIOD) return false;
uint32_t cycles = (float)(F_BUS / 1000000) * microseconds - 0.5;
if (cycles < 36) return false;
return beginCycles(funct, cycles);
}
bool begin(void (*funct)(), double microseconds) {
return begin(funct, (float)microseconds);
}
void end();
void priority(uint8_t n) {
nvic_priority = n;
#if defined(KINETISK)
if (channel) {
int index = channel - KINETISK_PIT_CHANNELS;
NVIC_SET_PRIORITY(IRQ_PIT_CH0 + index, nvic_priority);
}
#elif defined(KINETISL)
if (channel) {
int index = channel - KINETISK_PIT_CHANNELS;
nvic_priorites[index] = nvic_priority;
if (nvic_priorites[0] <= nvic_priorites[1]) {
NVIC_SET_PRIORITY(IRQ_PIT, nvic_priorites[0]);
} else {
NVIC_SET_PRIORITY(IRQ_PIT, nvic_priorites[1]);
}
}
#endif
}
operator IRQ_NUMBER_t() {
if (channel) {
#if defined(KINETISK)
int index = channel - KINETISK_PIT_CHANNELS;
return (IRQ_NUMBER_t)(IRQ_PIT_CH0 + index);
#elif defined(KINETISL)
return IRQ_PIT;
#endif
}
return (IRQ_NUMBER_t)NVIC_NUM_INTERRUPTS;
}
private:
KINETISK_PIT_CHANNEL_t *channel;
uint8_t nvic_priority;
#if defined(KINETISL)
static uint8_t nvic_priorites[2];
#endif
bool beginCycles(void (*funct)(), uint32_t cycles);
};
#ifdef __cplusplus
}
#endif
#endif