2015-06-25 00:21:35 +01:00
|
|
|
Miscellaneous instructions
|
|
|
|
|
==========================
|
|
|
|
|
|
|
|
|
|
* nop() ``pass`` no operation.
|
|
|
|
|
* wfi() Suspend execution in a low power state until an interrupt occurs.
|
|
|
|
|
* cpsid(flags) set the Priority Mask Register - disable interrupts.
|
|
|
|
|
* cpsie(flags) clear the Priority Mask Register - enable interrupts.
|
2016-01-11 06:48:35 +00:00
|
|
|
* mrs(Rd, special_reg) ``Rd = special_reg`` copy a special register to a general register. The special register
|
|
|
|
|
may be IPSR (Interrupt Status Register) or BASEPRI (Base Priority Register). The IPSR provides a means of determining
|
|
|
|
|
the exception number of an interrupt being processed. It contains zero if no interrupt is being processed.
|
2015-06-25 00:21:35 +01:00
|
|
|
|
|
|
|
|
Currently the ``cpsie()`` and ``cpsid()`` functions are partially implemented.
|
|
|
|
|
They require but ignore the flags argument and serve as a means of enabling and disabling interrupts.
|
