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Merge pull request #16522 from benpicco/bit_check

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sys/bit: add bit_checkXX() functions
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benpicco 2021-06-03 13:07:21 +02:00 committed by GitHub
commit 3ad85a380c
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1 changed files with 66 additions and 0 deletions
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66
sys/include/bit.h
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@ -197,6 +197,57 @@ static inline void bit_clear8(volatile uint8_t *ptr, uint8_t bit)
*((volatile uint8_t *)bitband_addr(ptr, bit)) = 0; *((volatile uint8_t *)bitband_addr(ptr, bit)) = 0;
} }
/**
* @brief Checks if a single bit in the 32 bit word pointed to by @p ptr is set
*
* The effect is the same as for the following snippet:
*
* @code{c}
* *ptr & (1 << bit);
* @endcode
*
* @param[in] ptr pointer to target word
* @param[in] bit bit number within the word
*/
static inline bool bit_check32(volatile uint32_t *ptr, uint8_t bit)
{
return *((volatile uint32_t *)bitband_addr(ptr, bit));
}
/**
* @brief Checks if a single bit in the 16 bit word pointed to by @p ptr is set
*
* The effect is the same as for the following snippet:
*
* @code{c}
* *ptr & (1 << bit);
* @endcode
*
* @param[in] ptr pointer to target word
* @param[in] bit bit number within the word
*/
static inline bool bit_check16(volatile uint16_t *ptr, uint8_t bit)
{
return *((volatile uint16_t *)bitband_addr(ptr, bit));
}
/**
* @brief Checks if a single bit in the 8 bit byte pointed to by @p ptr is set
*
* The effect is the same as for the following snippet:
*
* @code{c}
* *ptr & (1 << bit);
* @endcode
*
* @param[in] ptr pointer to target byte
* @param[in] bit bit number within the byte
*/
static inline bool bit_check8(volatile uint8_t *ptr, uint8_t bit)
{
return *((volatile uint8_t *)bitband_addr(ptr, bit));
}
/** @} */ /** @} */
#else /* CPU_HAS_BITBAND */ #else /* CPU_HAS_BITBAND */
@ -231,6 +282,21 @@ static inline void bit_clear8(volatile uint8_t *ptr, uint8_t bit)
*ptr &= ~(1 << (bit)); *ptr &= ~(1 << (bit));
} }
static inline bool bit_check32(volatile uint32_t *ptr, uint8_t bit)
{
return *ptr & (1 << bit);
}
static inline bool bit_check16(volatile uint16_t *ptr, uint8_t bit)
{
return *ptr & (1 << bit);
}
static inline bool bit_check8(volatile uint8_t *ptr, uint8_t bit)
{
return *ptr & (1 << bit);
}
#endif /* CPU_HAS_BITBAND */ #endif /* CPU_HAS_BITBAND */
#endif /* !BITBAND_FUNCTIONS_PROVIDED */ #endif /* !BITBAND_FUNCTIONS_PROVIDED */