nes-proj/cpu/avr/dev/clock.c

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#include "sys/clock.h"
#include "dev/clock-avr.h"
#include "sys/etimer.h"
#include <avr/io.h>
#include <avr/interrupt.h>
static volatile clock_time_t count;
static volatile uint8_t scount;
volatile unsigned long seconds;
/* Set RADIOSTATS to monitor radio on time (must also be set in the radio driver) */
#if RF230BB && WEBSERVER
#define RADIOSTATS 1
#endif
#if RADIOSTATS
static volatile uint8_t rcount;
volatile unsigned long radioontime;
extern uint8_t RF230_receive_on;
#endif
/*
CLOCK_SECOND is the number of ticks per second.
It is defined through CONF_CLOCK_SECOND in the contiki-conf.h for each platform.
The usual AVR default is ~125 ticks per second, counting a prescaler the CPU clock
using the 8 bit timer0.
As clock_time_t is an unsigned 16 bit data type, intervals up to 524 seconds
can be measured with 8 millisecond precision.
For longer intervals a 32 bit global is incremented every second.
clock-avr.h contains the specific setup code for each mcu.
*/
/*---------------------------------------------------------------------------*/
//SIGNAL(SIG_OUTPUT_COMPARE0)
ISR(AVR_OUTPUT_COMPARE_INT)
{
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count++;
if(++scount == CLOCK_SECOND) {
scount = 0;
seconds++;
}
#if RADIOSTATS
if (RF230_receive_on) {
if (++rcount == CLOCK_SECOND) {
rcount=0;
radioontime++;
}
}
#endif
if(etimer_pending()) {
etimer_request_poll();
}
}
/*---------------------------------------------------------------------------*/
void
clock_init(void)
{
cli ();
OCRSetup();
//scount = count = 0;
sei ();
}
/*---------------------------------------------------------------------------*/
clock_time_t
clock_time(void)
{
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clock_time_t tmp;
do {
tmp = count;
} while(tmp != count);
return tmp;
}
/*---------------------------------------------------------------------------*/
/**
* Delay the CPU for a multiple of TODO
*/
void
clock_delay(unsigned int i)
{
for (; i > 0; i--) { /* Needs fixing XXX */
unsigned j;
for (j = 50; j > 0; j--)
asm volatile("nop");
}
}
/*---------------------------------------------------------------------------*/
/**
* Wait for a multiple of 1 / 125 sec = 0.008 ms.
*
*/
void
clock_wait(int i)
{
clock_time_t start;
start = clock_time();
while(clock_time() - start < (clock_time_t)i);
}
/*---------------------------------------------------------------------------*/
void
clock_set_seconds(unsigned long sec)
{
// TODO
}
unsigned long
clock_seconds(void)
{
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unsigned long tmp;
do {
tmp = seconds;
} while(tmp != seconds);
return tmp;
}