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Converted timer to a more useful and easily used timer library.

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This commit is contained in:
skarg
2010-03-05 05:01:26 +00:00
parent d639f48788
commit d5c542fd22
11 changed files with 409 additions and 211 deletions
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bacnet-stack/ports/bdk-atxx4-mstp/timer2.c
+18 -104
View File
@@ -26,11 +26,6 @@
#include "hardware.h"
#include "timer.h"
/* define various timers in timer.h file */
#ifndef MAX_MILLISECOND_TIMERS
#define MAX_MILLISECOND_TIMERS 2
#endif
/* Timer2 Prescaling: 1, 8, 32, 64, 128, 256, or 1024 */
#define TIMER2_PRESCALER 128
/* Count: Timer counts up to 0xFF and then signals overflow */
@@ -40,24 +35,8 @@
#endif
#define TIMER2_COUNT (0xFF-TIMER2_TICKS)
/* counter for the various timers */
static volatile unsigned long Millisecond_Counter[MAX_MILLISECOND_TIMERS];
/*************************************************************************
* Description: Timer Interrupt Handler
* Returns: none
* Notes: Global interupts must be enabled
*************************************************************************/
static inline void timer_interrupt_handler(
void)
{
unsigned i; /* loop counter */
/* increment the tick count */
for (i = 0; i < MAX_MILLISECOND_TIMERS; i++) {
Millisecond_Counter[i]++;
}
}
/* counter for the the timer which wraps every 49.7 days */
static volatile uint32_t Millisecond_Counter;
/*************************************************************************
* Description: Timer Interrupt Service Routine - Timer Overflowed!
@@ -68,7 +47,7 @@ ISR(TIMER2_OVF_vect)
{
/* Set the counter for the next interrupt */
TCNT2 = TIMER2_COUNT;
timer_interrupt_handler();
Millisecond_Counter++;
}
/*************************************************************************
@@ -76,20 +55,17 @@ ISR(TIMER2_OVF_vect)
* Returns: none
* Notes: none
*************************************************************************/
unsigned long timer_milliseconds_set(
unsigned index,
unsigned long value)
uint32_t timer_milliseconds_set(
uint32_t value)
{
uint8_t sreg = 0; /* holds interrupts pending */
unsigned long old_value = 0; /* return value */
uint32_t old_value = 0; /* return value */
if (index < MAX_MILLISECOND_TIMERS) {
sreg = SREG;
__disable_interrupt();
old_value = Millisecond_Counter[index];
Millisecond_Counter[index] = value;
SREG = sreg;
}
sreg = SREG;
__disable_interrupt();
old_value = Millisecond_Counter;
Millisecond_Counter = value;
SREG = sreg;
return old_value;
}
@@ -99,76 +75,25 @@ unsigned long timer_milliseconds_set(
* Returns: none
* Notes: none
*************************************************************************/
unsigned long timer_milliseconds(
unsigned index)
uint32_t timer_milliseconds(void)
{
unsigned long timer_value = 0; /* return value */
uint32_t timer_value = 0; /* return value */
uint8_t sreg = 0; /* holds interrupts pending */
if (index < MAX_MILLISECOND_TIMERS) {
sreg = SREG;
__disable_interrupt();
timer_value = Millisecond_Counter[index];
SREG = sreg;
}
sreg = SREG;
__disable_interrupt();
timer_value = Millisecond_Counter;
SREG = sreg;
return timer_value;
}
/*************************************************************************
* Description: compares the current time count with a value
* Returns: true if the time has elapsed
* Notes: none
*************************************************************************/
bool timer_elapsed_milliseconds(
unsigned index,
unsigned long value)
{
return (timer_milliseconds(index) >= value);
}
/*************************************************************************
* Description: compares the current time count with a value
* Returns: true if the time has elapsed
* Notes: none
*************************************************************************/
bool timer_elapsed_seconds(
unsigned index,
unsigned long seconds)
{
return ((timer_milliseconds(index) / 1000UL) >= seconds);
}
/*************************************************************************
* Description: compares the current time count with a value
* Returns: true if the time has elapsed
* Notes: none
*************************************************************************/
bool timer_elapsed_minutes(
unsigned index,
unsigned long minutes)
{
return ((timer_milliseconds(index) / (1000UL * 60UL)) >= minutes);
}
/*************************************************************************
* Description: Sets the timer counter to zero.
* Returns: none
* Notes: none
*************************************************************************/
unsigned long timer_reset(
unsigned index)
{
return timer_milliseconds_set(index, 0);
}
/*************************************************************************
* Description: Initialization for Timer
* Returns: none
* Notes: none
*************************************************************************/
static void timer2_init(
void)
void timer_init(void)
{
/* Normal Operation */
TCCR2A = 0;
@@ -210,14 +135,3 @@ static void timer2_init(
/* Clear the Power Reduction Timer/Counter0 */
BIT_CLEAR(PRR, PRTIM2);
}
/*************************************************************************
* Description: Initialization for Timer
* Returns: none
* Notes: none
*************************************************************************/
void timer_init(
void)
{
timer2_init();
}