As written the specification when both period and pulse are zero is
inconsistent: allowed behavior would be to drive the pin at constant
active or constant inactive, depending on which condition was checked
first.
Clarify that driving constant active level requres a non-zero pulse
equal to period.
Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>
Clarify what happens when the period parameter is zero or equal
to the period.
Signed-off-by: Alexander Wachter <alexander.wachter@leica-geosystems.com>
This change removes the hardcoded subsystem list in gen_kobject_list.py
favor of marking the relevant driver API structs with the _subsystem
sentinel.
Signed-off-by: Corey Wharton <coreyw7@fb.com>
Add support for requesting an inverted PWM pulse (active-low) when
setting up the period and pulse width of a PWM pin. This is useful
when driving external, active-low circuitry (e.g. an LED) with a PWM
signal.
All in-tree PWM drivers is updated to match the new API signature, but
no driver support for inverted PWM signals is added yet.
All in-tree PWM consumers are updated to pass a flags value of 0
(0 meaning default, which is normal PWM polarity).
Fixes#21384.
Signed-off-by: Henrik Brix Andersen <hebad@vestas.com>
Consistently place C++ use of extern "C" after all include directives,
within the negative branch of _ASMLANGUAGE if used.
The inclusion of the generated syscall files is placed outside the
extern "C" block as the generated file has its own extern "C" block.
Background from issue #17997:
Declarations that use C linkage should be placed within extern "C"
so the language linkage is correct when the header is included by
a C++ compiler.
Similarly #include directives should be outside the extern "C" to
ensure the language-specific default linkage is applied to any
declarations provided by the included header.
See: https://en.cppreference.com/w/cpp/language/language_linkage
Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>
move pwm.h to drivers/pwm.h and
create a shim for backward-compatibility.
No functional changes to the headers.
A warning in the shim can be controlled with CONFIG_COMPAT_INCLUDES.
Related to #16539
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
