suspect-devices/circuitpython/stmhal/timer.c, branch reentrant-gcCircuitPython - a Python implementation for teaching coding with microcontrollershttps://git.suspectdevices.com/suspect-devices/circuitpython/atom?h=reentrant-gc2014-10-16T21:36:28+00:00py: First steps making GC reentrant.2014-10-16T21:36:28+00:00Damien Georgedamien.p.george@gmail.com2014-10-16T21:36:28+00:00urn:sha1:788f191e0693989fd5d2a9917c32933a1e83eb5aAdd support for complimentary channel output and deadtime.2014-10-10T20:54:03+00:00Dave Hylandsdhylands@gmail.com2014-10-10T16:56:41+00:00urn:sha1:1c795445b31a73bcff71eac4ce56827554b4f29f
This patch enables output on the complimentary channels (TIMx_CHyN).
For timers 1 and 8, deadtime can also be inserted when the channels
transition. For the pyboard, TIM8_CH1/CH1N and TIM8_CH2/CH2N can
take advantage of this.
stmhal: Use mp_uint_t where appropriate.2014-10-05T20:51:54+00:00Damien Georgedamien.p.george@gmail.com2014-10-05T20:51:54+00:00urn:sha1:d03c6816083c8ce8a35d278ede48c4089012b055
Found these by compiling stmhal with mp_uint_t of type uint32_t instead
of unsigned int. This actually makes a difference to the code, but just
a curiosity.
stmhal, timer: Fix timer.chanel so mode can be a keyword.2014-10-05T16:52:45+00:00Damien Georgedamien.p.george@gmail.com2014-10-04T14:25:01+00:00urn:sha1:ba0383a8c7b2fb394a7d2bc7a67cab7fc3200263stmhal, timer: Improve accuracy of freq computation.2014-10-05T16:52:45+00:00Damien Georgedamien.p.george@gmail.com2014-10-04T13:59:35+00:00urn:sha1:55f68b3ce809cb6331fb500fa10331b16cbc6c13stmhal, timer: Set freq from float; get timer source freq.2014-10-05T16:52:44+00:00Damien Georgedamien.p.george@gmail.com2014-10-04T13:36:39+00:00urn:sha1:97ef94df83238e58fd7a084c3ca0e8af164136e0
Timers now have the following new features:
- can init freq using floating point; eg tim.init(freq=0.1)
- tim.source_freq() added to get freq of timer clock source
- tim.freq() added to get/set freq
- print(tim) now prints freq
stmhal: Allow pyb.freq() function to change SYSCLK frequency.2014-10-04T00:54:31+00:00Damien Georgedamien.p.george@gmail.com2014-10-04T00:54:31+00:00urn:sha1:24119176e7ff39e55c8067624d74d17ac1f0ffa3
Eg pyb.freq(120000000) sets the CPU to 120MHz. The frequency can be set
at any point in the code, and can be changed as many times as you like.
Note that any active timers will need to be reconfigured after a freq
change.
Valid range is 24MHz to 168MHz (but not all freqs are supported). The
code maintains a 48MHz clock for the USB at all times and it's possible
to change the frequency at a USB REPL and keep the REPL alive (well,
most of the time it stays, sometimes it resets the USB for some reason).
Note that USB does not work with pyb.freq of 24MHz.
stmhal: Fix edge case for timer PWM of 100%.2014-09-29T13:15:01+00:00Damien Georgedamien.p.george@gmail.com2014-09-29T13:15:01+00:00urn:sha1:f042d7a4d7197d87798bc9727e9df094a3edd7c1
Also improve precision of calculating PWM percent in integer mode.
Also update teensy with edge case fix.
Fix timer overflow code.2014-09-28T02:40:37+00:00Dave Hylandsdhylands@gmail.com2014-09-26T16:04:05+00:00urn:sha1:39296b40d49b4b6b9373a80de67e017e540f1408
Teensy doesn't need to worry about overflows since all of
its timers are only 16-bit.
For PWM, the pulse width needs to be able to vary from 0..period+1
(pulse-width == period+1 corresponds to 100% PWM)
I couldn't test the 0xffffffff cases since we can't currently get a
period that big in python. With a prescaler of 0, that corresponds
to a freq of 0.039 (i.e. cycle every 25.56 seconds), and we can't
set that using freq or period.
I also tested both stmhal and teensy with floats disabled, which
required a few other code changes to compile.
stmhal, timer: Factor code to compute PWM percent; improve 32bit case.2014-09-25T14:44:10+00:00Damien Georgedamien.p.george@gmail.com2014-09-25T14:44:10+00:00urn:sha1:e8ea0724da1b2fd6f6eb1cc99154072159fc2c8d
Also do the same for teensy timer code.