ARM Compatiable Functions
- group NMSIS_Core_ARMCompatiable_Functions
A few functions that compatiable with ARM CMSIS-Core.
Here we provided a few functions that compatiable with ARM CMSIS-Core, mostly used in the DSP and NN library.
Defines
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__ISB() __RWMB()
Instruction Synchronization Barrier, compatiable with ARM.
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__DSB() __RWMB()
Data Synchronization Barrier, compatiable with ARM.
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__DMB() __RWMB()
Data Memory Barrier, compatiable with ARM.
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__LDRBT(ptr) __LB((ptr))
LDRT Unprivileged (8 bit), ARM Compatiable.
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__LDRHT(ptr) __LH((ptr))
LDRT Unprivileged (16 bit), ARM Compatiable.
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__LDRT(ptr) __LW((ptr))
LDRT Unprivileged (32 bit), ARM Compatiable.
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__STRBT(val, ptr) __SB((ptr), (val))
STRT Unprivileged (8 bit), ARM Compatiable.
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__STRHT(val, ptr) __SH((ptr), (val))
STRT Unprivileged (16 bit), ARM Compatiable.
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__STRT(val, ptr) __SW((ptr), (val))
STRT Unprivileged (32 bit), ARM Compatiable.
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__SSAT(val, sat) __RV_SCLIP32((val), (sat-1))
Signed Saturate.
Saturates a signed value.
- Parameters
value – [in] Value to be saturated
sat – [in] Bit position to saturate to (1..32)
- Returns
Saturated value
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__USAT(val, sat) __RV_UCLIP32((val), (sat))
Unsigned Saturate.
Saturates an unsigned value.
- Parameters
value – [in] Value to be saturated
sat – [in] Bit position to saturate to (0..31)
- Returns
Saturated value
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__RBIT(value) __RV_BITREVI((value), 31)
Reverse bit order of value.
Reverses the bit order of the given value.
- Parameters
value – [in] Value to reverse
- Returns
Reversed value
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__CLZ(data) __RV_CLZ32(data)
Count leading zeros.
Counts the number of leading zeros of a data value.
- Parameters
data – [in] Value to count the leading zeros
- Returns
number of leading zeros in value
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__EXPD_BYTE(x)
Expand byte to unsigned long value.
Expand byte value x to unsigned long value’s each byte.
- Parameters
x – [in] the byte value to be expand, the input must be uint8_t type
- Returns
Expanded value in unsigned long
Functions
- __STATIC_FORCEINLINE uint32_t __REV (uint32_t value)
Reverse byte order (32 bit)
Reverses the byte order in unsigned integer value. For example, 0x12345678 becomes 0x78563412.
- Parameters
value – [in] Value to reverse
- Returns
Reversed value
- __STATIC_FORCEINLINE uint32_t __REV16 (uint32_t value)
Reverse byte order (16 bit)
Reverses the byte order within each halfword of a word. For example, 0x12345678 becomes 0x34127856.
- Parameters
value – [in] Value to reverse
- Returns
Reversed value
- __STATIC_FORCEINLINE int16_t __REVSH (int16_t value)
Reverse byte order (16 bit)
Reverses the byte order in a 16-bit value and returns the signed 16-bit result. For example, 0x0080 becomes 0x8000.
- Parameters
value – [in] Value to reverse
- Returns
Reversed value
- __STATIC_FORCEINLINE uint32_t __ROR (uint32_t op1, uint32_t op2)
Rotate Right in unsigned value (32 bit)
Rotate Right (immediate) provides the value of the contents of a register rotated by a variable number of bits.
- Parameters
op1 – [in] Value to rotate
op2 – [in] Number of Bits to rotate(0-31)
- Returns
Rotated value
- __STATIC_FORCEINLINE unsigned long __CTZ (unsigned long data)
Count tailing zero.
Return the count of least-significant bit zero.for example, return 3 if x=0bxxx1000
- Parameters
data – [in] Value to count the tailing zeros
- Returns
number of tailing zeros in value
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__ISB() __RWMB()