ardupilot/libraries/AP_HAL/Util.cpp

145 lines
4.3 KiB
C++

#include "AP_HAL.h"
#include "Util.h"
#include "utility/print_vprintf.h"
#include <time.h>
#if defined(__APPLE__) && defined(__MACH__)
#include <sys/time.h>
#endif
/* Helper class implements AP_HAL::Print so we can use utility/vprintf */
class BufferPrinter : public AP_HAL::Print {
public:
BufferPrinter(char* str, size_t size) : _offs(0), _str(str), _size(size) {}
size_t write(uint8_t c) {
if (_offs < _size) {
_str[_offs] = c;
_offs++;
return 1;
} else {
return 0;
}
}
size_t write(const uint8_t *buffer, size_t size) {
size_t n = 0;
while (size--) {
n += write(*buffer++);
}
return n;
}
size_t _offs;
char* const _str;
const size_t _size;
};
int AP_HAL::Util::snprintf(char* str, size_t size, const char *format, ...)
{
va_list ap;
va_start(ap, format);
int res = vsnprintf(str, size, format, ap);
va_end(ap);
return res;
}
int AP_HAL::Util::vsnprintf(char* str, size_t size, const char *format, va_list ap)
{
BufferPrinter buf(str, size);
print_vprintf(&buf, format, ap);
// null terminate if possible
int ret = buf._offs;
buf.write(0);
return ret;
}
uint64_t AP_HAL::Util::get_system_clock_ms() const
{
#if defined(__APPLE__) && defined(__MACH__)
struct timeval ts;
gettimeofday(&ts, NULL);
return ((long long)((ts.tv_sec * 1000) + (ts.tv_usec / 1000)));
#else
struct timespec ts;
clock_gettime(CLOCK_REALTIME, &ts);
const uint64_t seconds = ts.tv_sec;
const uint64_t nanoseconds = ts.tv_nsec;
return (seconds * 1000UL + nanoseconds/1000000UL);
#endif
}
void AP_HAL::Util::get_system_clock_utc(int32_t &hour, int32_t &min, int32_t &sec, int32_t &ms) const
{
// get time of day in ms
uint64_t time_ms = get_system_clock_ms();
// separate time into ms, sec, min, hour and days but all expressed in milliseconds
ms = time_ms % 1000;
uint32_t sec_ms = (time_ms % (60 * 1000)) - ms;
uint32_t min_ms = (time_ms % (60 * 60 * 1000)) - sec_ms - ms;
uint32_t hour_ms = (time_ms % (24 * 60 * 60 * 1000)) - min_ms - sec_ms - ms;
// convert times as milliseconds into appropriate units
sec = sec_ms / 1000;
min = min_ms / (60 * 1000);
hour = hour_ms / (60 * 60 * 1000);
}
// get milliseconds from now to a target time of day expressed as hour, min, sec, ms
// match starts from first value that is not -1. I.e. specifying hour=-1, minutes=10 will ignore the hour and return time until 10 minutes past 12am (utc)
uint32_t AP_HAL::Util::get_time_utc(int32_t hour, int32_t min, int32_t sec, int32_t ms) const
{
// determine highest value specified (0=none, 1=ms, 2=sec, 3=min, 4=hour)
int8_t largest_element = 0;
if (hour != -1) {
largest_element = 4;
} else if (min != -1) {
largest_element = 3;
} else if (sec != -1) {
largest_element = 2;
} else if (ms != -1) {
largest_element = 1;
} else {
// exit immediately if no time specified
return 0;
}
// get start_time_ms as h, m, s, ms
int32_t curr_hour, curr_min, curr_sec, curr_ms;
get_system_clock_utc(curr_hour, curr_min, curr_sec, curr_ms);
int32_t total_delay_ms = 0;
// calculate ms to target
if (largest_element >= 1) {
total_delay_ms += ms - curr_ms;
}
if (largest_element == 1 && total_delay_ms < 0) {
return static_cast<uint32_t>(total_delay_ms += 1000);
}
// calculate sec to target
if (largest_element >= 2) {
total_delay_ms += (sec - curr_sec)*1000;
}
if (largest_element == 2 && total_delay_ms < 0) {
return static_cast<uint32_t>(total_delay_ms += (60*1000));
}
// calculate min to target
if (largest_element >= 3) {
total_delay_ms += (min - curr_min)*60*1000;
}
if (largest_element == 3 && total_delay_ms < 0) {
return static_cast<uint32_t>(total_delay_ms += (60*60*1000));
}
// calculate hours to target
if (largest_element >= 4) {
total_delay_ms += (hour - curr_hour)*60*60*1000;
}
if (largest_element == 4 && total_delay_ms < 0) {
return static_cast<uint32_t>(total_delay_ms += (24*60*60*1000));
}
// total delay in milliseconds
return static_cast<uint32_t>(total_delay_ms);
}