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CMSIS-Core (Cortex-A)
CMSIS-Core support for Cortex-A processor-based devices
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CMSIS-Core (Cortex-A)
CMSIS-Core support for Cortex-A processor-based devices
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Functions that generate specific Cortex-A CPU Instructions. More...
Macros | |
| #define | __NOP __builtin_arm_nop |
| No Operation. | |
| #define | __WFI __builtin_arm_wfi |
| Wait For Interrupt. | |
| #define | __WFE __builtin_arm_wfe |
| Wait For Event. | |
| #define | __SEV __builtin_arm_sev |
| Send Event. | |
| #define | __ISB() __builtin_arm_isb(0xF) |
| Instruction Synchronization Barrier. | |
| #define | __DSB() __builtin_arm_dsb(0xF) |
| Data Synchronization Barrier. | |
| #define | __DMB() __builtin_arm_dmb(0xF) |
| Data Memory Barrier. | |
| #define | __BKPT(value) __ASM volatile ("bkpt "#value) |
| Breakpoint. | |
Functions | |
| uint32_t | __REV (uint32_t value) |
| Reverse byte order (32 bit) | |
| uint16_t | __REV16 (uint16_t value) |
| Reverse byte order (16 bit) | |
| int32_t | __REVSH (int32_t value) |
| Reverse byte order (16 bit) | |
| uint32_t | __ROR (uint32_t op1, uint32_t op2) |
| Rotate Right in unsigned value (32 bit) | |
| uint32_t | __RBIT (uint32_t value) |
| Reverse bit order of value. | |
| uint8_t | __CLZ (uint32_t value) |
| Count leading zeros. | |
Functions that generate specific Cortex-A CPU Instructions.
| #define __BKPT | ( | value | ) | __ASM volatile ("bkpt "#value) |
Breakpoint.
Causes the processor to enter Debug state. Debug tools can use this to investigate system state when the instruction at a particular address is reached.
| [in] | value | is ignored by the processor. If required, a debugger can use it to store additional information about the breakpoint. |
Causes the processor to enter Debug state. Debug tools can use this to investigate system state when the instruction at a particular address is reached.
| #define __DMB | ( | ) | __builtin_arm_dmb(0xF) |
Data Memory Barrier.
Ensures the apparent order of the explicit memory operations before and after the instruction, without ensuring their completion.
| #define __DSB | ( | ) | __builtin_arm_dsb(0xF) |
Data Synchronization Barrier.
Acts as a special kind of Data Memory Barrier. It completes when all explicit memory accesses before this instruction complete.
| #define __ISB | ( | ) | __builtin_arm_isb(0xF) |
Instruction Synchronization Barrier.
Instruction Synchronization Barrier flushes the pipeline in the processor, so that all instructions following the ISB are fetched from cache or memory, after the instruction has been completed.
| #define __NOP __builtin_arm_nop |
No Operation.
No Operation does nothing. This instruction can be used for code alignment purposes.
| #define __SEV __builtin_arm_sev |
Send Event.
Send Event is a hint instruction. It causes an event to be signaled to the CPU.
| #define __WFE __builtin_arm_wfe |
Wait For Event.
Wait For Event is a hint instruction that permits the processor to enter a low-power state until one of a number of events occurs.
Wait For Event is a hint instruction that permits the processor to enter
| #define __WFI __builtin_arm_wfi |
Wait For Interrupt.
Wait For Interrupt is a hint instruction that suspends execution until one of a number of events occurs.
| uint8_t __CLZ | ( | uint32_t | value | ) |
Count leading zeros.
Counts the number of leading zeros of a data value.
| [in] | value | Value to count the leading zeros |
| uint32_t __RBIT | ( | uint32_t | value | ) |
Reverse bit order of value.
Reverses the bit order of the given value.
| [in] | value | Value to reverse |
| uint32_t __REV | ( | uint32_t | value | ) |
Reverse byte order (32 bit)
Reverses the byte order in unsigned integer value. For example, 0x12345678 becomes 0x78563412.
| [in] | value | Value to reverse |
| uint16_t __REV16 | ( | uint16_t | value | ) |
Reverse byte order (16 bit)
Reverses the byte order within each halfword of a word. For example, 0x12345678 becomes 0x34127856.
| [in] | value | Value to reverse |
| int32_t __REVSH | ( | int32_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.
| [in] | value | Value to reverse |
| 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.
| [in] | op1 | Value to rotate |
| [in] | op2 | Number of Bits to rotate |