Working CPU-Timer
As long as sleep time in wallclock-example is short enough, we're scheduled by the etimer -- since etimer callback is missing (no timer interrupt yet) this doesn't work when time gets longer.
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@ -68,7 +68,7 @@
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#include <stdio.h> // FIXME
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static volatile clock_time_t count;
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volatile unsigned long seconds;
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unsigned long offset;
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long sleepseconds;
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/*---------------------------------------------------------------------------*/
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@ -84,69 +84,28 @@ clock_init(void)
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* Return the tick counter. We use the full 64bit counter which makes
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* computation of seconds etc. easier later.
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*/
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#define MAX_MEASURE 40
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static clock_time_t measure [MAX_MEASURE];
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static volatile int counter = 0;
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void print_clocks (void)
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{
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static int done = 0;
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int i;
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clock_time_t big = 0x1234567890098765LL;
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if (done || counter < MAX_MEASURE) {
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return;
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}
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for (i=0; i<counter; i++) {
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clock_time_t tmp = measure [i];
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uint32_t *p = (uint32_t *)(measure + i);
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printf (">%016llx< ", tmp);
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printf (">>%08lx%08lx<< ", (uint32_t)(tmp>>32), (uint32_t)tmp);
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printf (">>>%08lx%08lx<<<\n", p [1], p [0]); /* little endian */
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}
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printf ("counter: %d\n", counter);
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printf ("Sizes: %u %u\n", sizeof (uint32_t), sizeof (clock_time_t));
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printf ("Test: %016llx\n", big);
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printf ("Test: %08lx%08lx\n", (uint32_t)(big>>32), (uint32_t)big);
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if (counter == MAX_MEASURE) {
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done = 1;
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}
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}
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clock_time_t
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clock_time(void)
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{
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clock_time_t tmp;
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int i = counter;
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asm ("1: rdcycleh t1\n"
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"rdcycle t0\n"
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"rdcycleh t2\n"
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"bne t1,t2,1b\n"
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"sw t0,0(%1)\n"
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"sw t0,4(%1)\n"
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: "=r" (tmp)
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: "r" (&tmp)
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: "t0", "t1", "t2"
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uint32_t low, high;
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asm ("1: rdcycleh %1\n"
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"rdcycle %0\n"
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"rdcycleh t0\n"
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"bne %1,t0,1b\n"
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: "=r" (low), "=r" (high)
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:
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: "t0"
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);
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if (i < MAX_MEASURE) {
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measure [i++] = tmp;
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counter = i;
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}
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return tmp;
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return ((clock_time_t)high) << 32 | low;
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}
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/*---------------------------------------------------------------------------*/
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/**
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* Return seconds, default is time since startup.
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* The comparison avoids the need to disable clock interrupts for an atomic
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* read of the four-byte variable.
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*/
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unsigned long
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clock_seconds(void)
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{
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unsigned long tmp;
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do {
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tmp = seconds;
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} while(tmp != seconds);
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return tmp;
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return (unsigned long)(clock_time () / CLOCK_CONF_SECOND) + offset;
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}
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/*---------------------------------------------------------------------------*/
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/**
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@ -155,7 +114,7 @@ clock_seconds(void)
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void
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clock_set_seconds(unsigned long sec)
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{
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seconds = sec;
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offset = sec - (unsigned long)(clock_time () / CLOCK_CONF_SECOND);
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}
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/*---------------------------------------------------------------------------*/
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/*
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@ -172,35 +131,7 @@ clock_wait(clock_time_t t)
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void
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clock_delay_usec(uint16_t dt)
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{
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}
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/*---------------------------------------------------------------------------*/
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/**
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* Delay up to 65535 milliseconds.
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* \param howlong How many milliseconds to delay.
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*
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* Neither interrupts nor the watchdog timer is disabled over the delay.
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* Platforms are not required to implement this call.
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* \note This will break for CPUs clocked above 260 MHz.
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*/
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void
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clock_delay_msec(uint16_t howlong)
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{
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#if F_CPU>=16000000
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while(howlong--) clock_delay_usec(1000);
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#elif F_CPU>=8000000
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uint16_t i=996;
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while(howlong--) {clock_delay_usec(i);i=999;}
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#elif F_CPU>=4000000
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uint16_t i=992;
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while(howlong--) {clock_delay_usec(i);i=999;}
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#elif F_CPU>=2000000
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uint16_t i=989;
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while(howlong--) {clock_delay_usec(i);i=999;}
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#else
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uint16_t i=983;
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while(howlong--) {clock_delay_usec(i);i=999;}
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#endif
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clock_wait (CLOCK_SECOND * dt / 1000000ULL);
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}
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/*---------------------------------------------------------------------------*/
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/**
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2
examples/osd/ico-wallclock-time/.gitignore
vendored
2
examples/osd/ico-wallclock-time/.gitignore
vendored
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@ -6,3 +6,5 @@ icosoc.v
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icosoc.ys
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wallclock.co
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wallclock.pico-rv32-icoboard
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icosoc.c
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icosoc.h
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@ -72,7 +72,11 @@ PROCESS (wallclock, "Wallclock Example Server");
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AUTOSTART_PROCESSES(&wallclock);
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#define LOOP_INTERVAL (30 * CLOCK_SECOND)
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//#define LOOP_INTERVAL (30 * CLOCK_SECOND)
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//#define LOOP_INTERVAL (3 * CLOCK_SECOND)
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// one more than this will currently hang, probably due to
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// non-implemented etimer callback.
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#define LOOP_INTERVAL (25461)
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/*
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* Set led to on or off, we abuse the given pointer to simply carry the
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@ -84,7 +88,15 @@ void led_set (void *onoff)
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icosoc_leds_set (0xFF * status);
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}
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extern void print_clocks (void);
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#if 0
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/* long long printing not working */
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void test_print (void)
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{
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clock_time_t big = 0x1234567890098765LL;
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printf ("Test: %016llx\n", big);
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printf ("Test: %08lx%08lx\n", (uint32_t)(big>>32), (uint32_t)big);
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}
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#endif
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PROCESS_THREAD(wallclock, ev, data)
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{
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@ -125,10 +137,11 @@ PROCESS_THREAD(wallclock, ev, data)
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* We need to call cron every 30 seconds or so (at least once a
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* minute)
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*/
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printf ("Loop-interval: %ld\n", (uint32_t)LOOP_INTERVAL);
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etimer_set (&loop_periodic_timer, LOOP_INTERVAL);
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while (1) {
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printf ("In while loop\n");
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print_clocks ();
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clock_time_t cl = clock_time ();
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printf ("In while loop: %08lx%08lx\n", (uint32_t)(cl>>32), (uint32_t)cl);
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PROCESS_WAIT_EVENT();
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if (etimer_expired (&loop_periodic_timer)) {
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//cron ();
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@ -7,7 +7,7 @@ CONTIKI_TARGET_SOURCEFILES += contiki-main.c params.c
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CONTIKIPICORV32=$(CONTIKI)/cpu/pico-rv32
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CONTIKIBOARD=.
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CONTIKI_PLAT_DEFS = -DF_CPU=8000000UL -DAUTO_CRC_PADDING=2
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CONTIKI_PLAT_DEFS = -DAUTO_CRC_PADDING=2
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MCU=pico-rv32
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@ -47,9 +47,12 @@
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#define PLATFORM_NAME "PicoRV32-icoboard"
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#define PLATFORM_TYPE PICORV32
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#ifndef F_CPU
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#define F_CPU 8000000UL
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#define F_CPU 2000000ULL
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#endif
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/* Clock ticks per second, our timer runs with cpu freq */
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#define CLOCK_CONF_SECOND F_CPU
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typedef uint64_t clock_time_t;
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#define CLOCK_LT(a,b) ((a)<(b))
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