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-rw-r--r--source/pwm.rst23
1 files changed, 11 insertions, 12 deletions
diff --git a/source/pwm.rst b/source/pwm.rst
index 42dc1a5..fd72842 100644
--- a/source/pwm.rst
+++ b/source/pwm.rst
@@ -1,10 +1,9 @@
.. _pwm:
-==============================
- Pulse-Width Modulation (PWM)
-==============================
+PWM
+===
-Pulse Width Modulation is a basic technique to create repeated square
+Pulse Width Modulation (PWM) is a basic technique to create repeated square
waves (digital high/low voltage transitions) of user defined length
and duty cycle. It can be used as a way to encode an "analog" signal
on a single digital (high/low) line using the time between transitions
@@ -42,7 +41,7 @@ to track down exactly which timer *channel* corresponds to each pin.
Timer1 | D6,D7,D8
Timer2 | D0,D1,D2,D3
Timer3 | D11,D12,D27,D28
- Timer4 | D5,D9,D14,D24
+ Timer4 | D5,D9,D14,D24
Background
----------
@@ -96,11 +95,11 @@ Function Reference
``pinMode(pin_num, PWM)``
- This command is usually called from `setup()`_ to tell the
- microcontroller that pin_num should be configured to PWM
- output. ``PWM`` implies regular driven OUTPUT; ``PWM_OPEN_DRAIN`` is
- also available (see the list of :ref:`GPIO modes <gpio-modes>` for
- more information).
+ This command is usually called from :ref:`setup() <lang-setup>` to
+ tell the microcontroller that pin_num should be configured to PWM
+ output. ``PWM`` implies regular driven OUTPUT; ``PWM_OPEN_DRAIN``
+ is also available (see the list of :ref:`GPIO modes <gpio-modes>`
+ for more information).
.. _pwm-pwmwrite:
@@ -144,8 +143,8 @@ Function Reference
For instance, an 8MHz frequency can be achieved by setting
``prescale`` to 9, since 72MHz / 9 = 8MHz.
- This function is normally called once from, `setup()`_, but the
- timer can be reconfigured with a new prescaler at any time.
+ This function is normally called once from, :ref:`lang-setup`, but
+ the timer can be reconfigured with a new prescaler at any time.
* Configure the prescaler and overflow values to generate a timer
* reload with a period as close to the given number of