Skip to content

Remove usage of log2() with floating point value #40

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 1 commit into from
Sep 14, 2020
Merged

Remove usage of log2() with floating point value #40

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
10 changes: 7 additions & 3 deletions src/rtc.c
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -35,7 +35,6 @@
*/

#include "rtc.h"
#include <math.h>

#if defined(STM32_CORE_VERSION) && (STM32_CORE_VERSION > 0x01090000) &&\
defined(HAL_RTC_MODULE_ENABLED) && !defined(HAL_RTC_MODULE_ONLY)
Expand Down Expand Up @@ -77,6 +76,11 @@ static void RTC_initClock(sourceClock_t source);
static void RTC_computePrediv(int8_t *asynch, int16_t *synch);
#endif /* !STM32F1xx */

static inline int _log2(int x)
{
return (x > 0) ? (sizeof(int) * 8 - __builtin_clz(x) - 1) : 0;
}

/* Exported functions --------------------------------------------------------*/

/**
Expand Down Expand Up @@ -217,7 +221,7 @@ void RTC_setPrediv(int8_t asynch, int16_t synch)
} else {
RTC_computePrediv(&predivAsync, &predivSync);
}
predivSync_bits = (uint8_t)log2(predivSync) + 1;
predivSync_bits = (uint8_t)_log2(predivSync) + 1;
#else
UNUSED(asynch);
UNUSED(synch);
Expand All @@ -241,7 +245,7 @@ void RTC_getPrediv(int8_t *asynch, int16_t *synch)
*asynch = predivAsync;
*synch = predivSync;
}
predivSync_bits = (uint8_t)log2(predivSync) + 1;
predivSync_bits = (uint8_t)_log2(predivSync) + 1;
#else
UNUSED(asynch);
UNUSED(synch);
Expand Down