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Diffstat (limited to 'source/lang/api/analogwrite.rst')
| -rw-r--r-- | source/lang/api/analogwrite.rst | 24 |
1 files changed, 14 insertions, 10 deletions
diff --git a/source/lang/api/analogwrite.rst b/source/lang/api/analogwrite.rst index e789305..dd2192a 100644 --- a/source/lang/api/analogwrite.rst +++ b/source/lang/api/analogwrite.rst @@ -52,7 +52,7 @@ you much more precise control over the duty cycle of your PWM output. If you're porting code from the Arduino and want a quick-and-dirty fix, one solution is to :ref:`map <lang-map>` the argument to -analogWrite into the right range:: +analogWrite() into the right range:: // Arduino code: analogWrite(pin, duty); @@ -71,8 +71,8 @@ that Timer's overflow to 255. Subsequent calls to analogWrite() should work as on the Arduino (with the same loss of precision). Note, however, that that affects the overflow for the **entire timer**, so other code relying on that timer (such as any -:ref:`interrupts <lang-attachinterrupt>` the timer controls) will -likely need to be modified as well. +:ref:`interrupts <lang-hardwaretimer-interrupts>` the timer controls) +will likely need to be modified as well. Difference 2: You must use pinMode() to set up PWM ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ @@ -141,23 +141,27 @@ the steps are: 1. Figure out which :ref:`timer <lang-hardwaretimer>` controls PWM output on your pin (\ :ref:`your board's Timer Pin Map - <gpio-pin-maps>` is your friend here). Let's say it's ``Timern``\ - , where ``n`` is some number 1, 2, 3, or 4. + <gpio-pin-maps>` is your friend here). -2. Call ``Timern.setPeriod(2041)``\ . This will set the timer's - period to approximately 2041 microseconds, which is a frequency of - approximately 490 Hz. +2. Let's say it's timer ``n``, where ``n`` is some number. You'll + then need to put "``HardwareTimer timer(n);``" with your variables, + as described in the :ref:`HardwareTimer + <lang-hardwaretimer-getting-started>` reference. + +3. In your :ref:`lang-setup`, put "``timer.setPeriod(2041);``". This + will set the timer's period to approximately 2041 microseconds, + which is a frequency of approximately 490 Hz. Be aware that this will change the period for the **entire timer**\ , and will affect anything else in your program that depends on that timer. The important examples are :ref:`timer interrupts -<lang-hardwaretimer-attachinterrupt>` and :ref:`PWM +<lang-hardwaretimer-interrupts>` and :ref:`PWM <timers-pwm-conflicts>`\ . See Also -------- -- :ref:`Maple PWM tutorial <pwm>` +- :ref:`pwm` .. rubric:: Footnotes |