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<title>suspect-devices/circuitpython/stmhal/timer.h, branch v1.9.2</title>
<subtitle>CircuitPython - a Python implementation for teaching coding with microcontrollers</subtitle>
<id>https://git.suspectdevices.com/suspect-devices/circuitpython/atom?h=v1.9.2</id>
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<updated>2017-07-31T08:35:40+00:00</updated>
<entry>
<title>all: Use the name MicroPython consistently in comments</title>
<updated>2017-07-31T08:35:40+00:00</updated>
<author>
<name>Alexander Steffen</name>
<email>devel.20.webmeister@spamgourmet.com</email>
</author>
<published>2017-06-30T07:22:17+00:00</published>
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<id>urn:sha1:55f33240f3d7051d4213629e92437a36f1fac50e</id>
<content type='text'>
There were several different spellings of MicroPython present in comments,
when there should be only one.
</content>
</entry>
<entry>
<title>all: Unify header guard usage.</title>
<updated>2017-07-18T01:57:39+00:00</updated>
<author>
<name>Alexander Steffen</name>
<email>devel.20.webmeister@spamgourmet.com</email>
</author>
<published>2017-06-29T21:14:58+00:00</published>
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<id>urn:sha1:299bc625864b9e624ed599c94a5f95870516139a</id>
<content type='text'>
The code conventions suggest using header guards, but do not define how
those should look like and instead point to existing files. However, not
all existing files follow the same scheme, sometimes omitting header guards
altogether, sometimes using non-standard names, making it easy to
accidentally pick a "wrong" example.

This commit ensures that all header files of the MicroPython project (that
were not simply copied from somewhere else) follow the same pattern, that
was already present in the majority of files, especially in the py folder.

The rules are as follows.

Naming convention:
* start with the words MICROPY_INCLUDED
* contain the full path to the file
* replace special characters with _

In addition, there are no empty lines before #ifndef, between #ifndef and
one empty line before #endif. #endif is followed by a comment containing
the name of the guard macro.

py/grammar.h cannot use header guards by design, since it has to be
included multiple times in a single C file. Several other files also do not
need header guards as they are only used internally and guaranteed to be
included only once:
* MICROPY_MPHALPORT_H
* mpconfigboard.h
* mpconfigport.h
* mpthreadport.h
* pin_defs_*.h
* qstrdefs*.h
</content>
</entry>
<entry>
<title>stmhal: Add PWM capability for LED(3) and LED(4) on pyboards.</title>
<updated>2016-01-29T22:44:43+00:00</updated>
<author>
<name>Damien George</name>
<email>damien.p.george@gmail.com</email>
</author>
<published>2016-01-29T22:44:43+00:00</published>
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<id>urn:sha1:a8a4b01af6501ff7ab61b251fc30fcf8a286f8d1</id>
<content type='text'>
USB CDC no longer needs TIM3 (which was originally used for LED(4) PWM)
and so TIM3 has been freed for general purpose use by the user.  Hence
LED(4) lost its PWM capabilities.

This patch reinstates the PWM capabilities using a semi-generic piece
of code which allows to configure a timer and PWM channel to use for any
LED.  But the PWM capability is only configured if the LED is set to an
intensity between 1 and 254 (ie only when needed).  In that case the
relevant timer is configured for PWM.  It's up to the user to make sure
the timers are not used if PWM is active.

This patch also makes sure that PWM LEDs are turned off using standard
GPIO when calling led.off() or led.intensity(0), instead of just setting
the PWM counter to zero.
</content>
</entry>
<entry>
<title>stmhal: Make TIM3 available for use by the user.</title>
<updated>2016-01-29T22:31:56+00:00</updated>
<author>
<name>Damien George</name>
<email>damien.p.george@gmail.com</email>
</author>
<published>2016-01-29T22:31:56+00:00</published>
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<id>urn:sha1:ea89b80ff4f842b010f9f8ec3280675f81bc6bc5</id>
<content type='text'>
TIM3 is no longer used by USB CDC for triggering outgoing data, so we
can now make it available to the user.

PWM fading on LED(4) is now gone, but will be reinstated in a new way.
</content>
</entry>
<entry>
<title>stmhal: Allow ADC.read_timed to take Timer object in place of freq.</title>
<updated>2015-07-22T18:41:13+00:00</updated>
<author>
<name>Damien George</name>
<email>damien.p.george@gmail.com</email>
</author>
<published>2015-07-22T18:37:21+00:00</published>
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<id>urn:sha1:7693ef3bd6e4456105c86909174a00f535a19261</id>
<content type='text'>
This allows a user-specified Timer for the triggering of the ADC read,
mirroring the new behaviour of DAC.write_timed.

Addresses issue #1129.
</content>
</entry>
<entry>
<title>stmhal: Allow DAC.write_timed to take Timer object in place of freq.</title>
<updated>2015-07-21T22:39:49+00:00</updated>
<author>
<name>Damien George</name>
<email>damien.p.george@gmail.com</email>
</author>
<published>2015-07-21T22:37:45+00:00</published>
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<id>urn:sha1:abc24c187614e358faa10ed6a3e239151f70b9f8</id>
<content type='text'>
This allows the DAC to use a user-specified Timer for the triggering
(instead of the default Timer(6)), while still supporting original
behaviour.

Addresses issues #1129 and #1388.
</content>
</entry>
<entry>
<title>Add timer_deinit and call it just before doing a soft-restart</title>
<updated>2014-06-30T15:07:38+00:00</updated>
<author>
<name>Dave Hylands</name>
<email>dhylands@gmail.com</email>
</author>
<published>2014-06-30T14:55:54+00:00</published>
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<id>urn:sha1:0d81c133b31774058408a5f1d1a058d9734a9def</id>
<content type='text'>
This fixes #733.
</content>
</entry>
<entry>
<title>Add license header to (almost) all files.</title>
<updated>2014-05-03T22:27:38+00:00</updated>
<author>
<name>Damien George</name>
<email>damien.p.george@gmail.com</email>
</author>
<published>2014-05-03T22:27:38+00:00</published>
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<id>urn:sha1:04b9147e150d2d6fa3750f312fe328b6a71c1b28</id>
<content type='text'>
Blanket wide to all .c and .h files.  Some files originating from ST are
difficult to deal with (license wise) so it was left out of those.

Also merged modpyb.h, modos.h, modstm.h and modtime.h in stmhal/.
</content>
</entry>
<entry>
<title>stmhal: Add Timer class: simple TIM control, incl callback on IRQ.</title>
<updated>2014-04-21T15:48:16+00:00</updated>
<author>
<name>Damien George</name>
<email>damien.p.george@gmail.com</email>
</author>
<published>2014-04-21T15:48:16+00:00</published>
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<id>urn:sha1:7fdfa93700e0f5a5381a57bca3c45865c720dc2f</id>
<content type='text'>
Simple but functional timer control.  More sophistication will
eventually be added, or for now just use direct register access :)

Also added pyb.freq() function to get MCU clock frequencies.
</content>
</entry>
<entry>
<title>stmhal: Add ADC function to read data at a given frequency.</title>
<updated>2014-04-15T18:52:56+00:00</updated>
<author>
<name>Damien George</name>
<email>damien.p.george@gmail.com</email>
</author>
<published>2014-04-15T18:52:56+00:00</published>
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<id>urn:sha1:4d7f4eb6a924f4df458eda2e624f429d67ef2248</id>
<content type='text'>
Reads ADC values into a bytearray (or similar) at a fixed rate.  Needs a
better name and improved API.  Also fix up DAC dma function (which also
needs a better name and API).
</content>
</entry>
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