danog/system-bus-radio
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Merge branch 'master' of https://github.com/hmage/system-bus-radio into hmage-master

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* 'master' of https://github.com/hmage/system-bus-radio:
  Use absolute time as per PR#3.
  Fix compilation warning
  Compiles on both linux and mach
  add make clean target
  Fix compilation on 32bit
  Add makefile
This commit is contained in:
William Entriken 2016-03-04 17:27:12 -05:00
commit 91cfdfc9ed
2 changed files with 47 additions and 1 deletions
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8
Makefile Normal file
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@ -0,0 +1,8 @@
CPPFLAGS=-Wall -O2 -msse2
main: main.c
.PHONY: clean
clean:
rm -f main

40
main.c
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@ -4,10 +4,46 @@
#include <stdio.h>
#include <emmintrin.h>
#include <inttypes.h>
#include <time.h>
#ifdef __MACH__
#include <mach/mach_traps.h>
#include <mach/mach_time.h>
#endif
#include <math.h>
#ifndef NSEC_PER_SEC
#define NSEC_PER_SEC 1000000000ull
#endif
#ifndef __MACH__
#define TIME_ABSOLUTE CLOCK_REALTIME
typedef struct timespec mach_timespec_t;
typedef unsigned int mach_port_t;
static inline uint64_t mach_absolute_time(void) {
mach_timespec_t tp;
int res = clock_gettime(CLOCK_REALTIME, &tp);
if (res < 0) {
perror("clock_gettime");
exit(1);
}
uint64_t result = tp.tv_sec * NSEC_PER_SEC;
result += tp.tv_nsec;
return result;
}
// non-conformant wrapper just for the purposes of this application
static inline void clock_sleep_trap(mach_port_t clock_port, int sleep_type, time_t sec, long nsec, mach_timespec_t *remain) {
mach_timespec_t req = { sec, nsec };
int res = clock_nanosleep(sleep_type, TIMER_ABSTIME, &req, remain);
if (res < 0) {
perror("clock_nanosleep");
exit(1);
}
}
#endif // __MACH__
__m128i reg;
__m128i reg_zero;
__m128i reg_one;
@ -35,14 +71,16 @@ static inline void square_am_signal(float time, float frequency) {
int main()
{
#ifdef __MACH__
mach_timebase_info_data_t theTimeBaseInfo;
mach_timebase_info(&theTimeBaseInfo);
puts("TESTING TIME BASE: the following should be 1 / 1");
printf(" Mach base: %u / %u nanoseconds\n\n", theTimeBaseInfo.numer, theTimeBaseInfo.denom);
#endif
uint64_t start = mach_absolute_time();
uint64_t end = mach_absolute_time();
printf("TESTING TIME TO EXECUTE mach_absolute_time()\n Result: %lld nanoseconds\n\n", end - start);
printf("TESTING TIME TO EXECUTE mach_absolute_time()\n Result: %"PRIu64" nanoseconds\n\n", end - start);
reg_zero = _mm_set_epi32(0, 0, 0, 0);
reg_one = _mm_set_epi32(-1, -1, -1, -1);