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fix the represntation of at_the_end_of_time to be 63 one bits rather than 32

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This commit is contained in:
graham sanderson
2021-02-17 14:15:00 -06:00
parent debef7471e
commit 684986aae6
5 changed files with 27 additions and 5 deletions
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15
src/common/pico_base/include/pico/types.h
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@ -37,7 +37,8 @@ static inline uint64_t to_us_since_boot(absolute_time_t t) {
/*! fn update_us_since_boot
* \brief update an absolute_time_t value to represent a given number of microseconds since boot
* \param t the absolute time value to update
* \param us_since_boot the number of microseconds since boot to represent
* \param us_since_boot the number of microseconds since boot to represent. Note this should be representable
* as a signed 64 bit integer
*/
static inline void update_us_since_boot(absolute_time_t *t, uint64_t us_since_boot) {
*t = us_since_boot;
@ -49,11 +50,23 @@ typedef struct {
uint64_t _private_us_since_boot;
} absolute_time_t;
/*! fn to_us_since_boot
* \brief convert an absolute_time_t into a number of microseconds since boot.
* \param t the number of microseconds since boot
* \return an absolute_time_t value equivalent to t
*/
static inline uint64_t to_us_since_boot(absolute_time_t t) {
return t._private_us_since_boot;
}
/*! fn update_us_since_boot
* \brief update an absolute_time_t value to represent a given number of microseconds since boot
* \param t the absolute time value to update
* \param us_since_boot the number of microseconds since boot to represent. Note this should be representable
* as a signed 64 bit integer
*/
static inline void update_us_since_boot(absolute_time_t *t, uint64_t us_since_boot) {
assert(us_since_boot <= INT64_MAX);
t->_private_us_since_boot = us_since_boot;
}
#define ABSOLUTE_TIME_INITIALIZED_VAR(name, value) name = {value}

4
src/common/pico_time/include/pico/time.h
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@ -155,7 +155,9 @@ static inline int64_t absolute_time_diff_us(absolute_time_t from, absolute_time_
return (int64_t)(to_us_since_boot(to) - to_us_since_boot(from));
}
/*! \brief The timestamp representing the end of time; no timestamp is after this
/*! \brief The timestamp representing the end of time; this is actually not the maximum possible
* timestamp, but is set to 0x7fffffff_ffffffff microseconds to avoid sign overflows with time
* arithmetic. This is still over 7 million years, so should be sufficient.
* \ingroup timestamp
*/
extern const absolute_time_t at_the_end_of_time;

3
src/common/pico_time/time.c
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@ -11,10 +11,9 @@
#include "pico/time.h"
#include "pico/util/pheap.h"
#include "hardware/sync.h"
#include "hardware/gpio.h"
const absolute_time_t ABSOLUTE_TIME_INITIALIZED_VAR(nil_time, 0);
const absolute_time_t ABSOLUTE_TIME_INITIALIZED_VAR(at_the_end_of_time, ULONG_MAX);
const absolute_time_t ABSOLUTE_TIME_INITIALIZED_VAR(at_the_end_of_time, INT64_MAX);
typedef struct alarm_pool_entry {
absolute_time_t target;