diff options
Diffstat (limited to 'docs/library/machine.TimerWiPy.rst')
| -rw-r--r-- | docs/library/machine.TimerWiPy.rst | 13 |
1 files changed, 3 insertions, 10 deletions
diff --git a/docs/library/machine.TimerWiPy.rst b/docs/library/machine.TimerWiPy.rst index 54280a599..17215d502 100644 --- a/docs/library/machine.TimerWiPy.rst +++ b/docs/library/machine.TimerWiPy.rst @@ -18,16 +18,6 @@ defines a baseline operation of executing a callback with a given period (or once after some delay), and allow specific boards to define more non-standard behaviour (which thus won't be portable to other boards). -See discussion of :ref:`important constraints <machine_callbacks>` on -Timer callbacks. - -.. note:: - - Memory can't be allocated inside irq handlers (an interrupt) and so - exceptions raised within a handler don't give much information. See - :func:`micropython.alloc_emergency_exception_buf` for how to get around this - limitation. - Constructors ------------ @@ -134,6 +124,9 @@ Methods ``TimerWiPy.ONE_SHOT``. In the case that mode is ``TimerWiPy.PWM`` then trigger must be equal to ``TimerWiPy.MATCH``. + Note that callback handlers are hard interrupts, and the constraints described in :ref:`isr_rules` + apply when they are executed. + Returns a callback object. .. method:: timerchannel.freq([value]) |