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docs: Add more documentation for the CC3200 in the pyb module.

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This commit is contained in:
Daniel Campora 2015-06-11 15:53:31 +02:00
parent cdfa11f550
commit ea2cc2b907
10 changed files with 432 additions and 231 deletions
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34
cc3200/mods/pybtimer.c
View File

@ -315,8 +315,9 @@ STATIC void pyb_timer_print(const mp_print_t *print, mp_obj_t self_in, mp_print_
/// Initialise the timer. Initialisation must give the desired mode
/// and an optional timer width
///
/// tim.init(mode=Timer.ONE_SHOT, width=32) # one shot mode
/// tim.init(mode=Timer.PERIODIC) # configure in free running periodic mode
/// tim.init(mode=Timer.ONE_SHOT, width=16) # one shot mode splitted into two 16-bit independent timers
/// split into two 16-bit independent timers
///
/// Keyword arguments:
///
@ -326,7 +327,7 @@ STATIC void pyb_timer_print(const mp_print_t *print, mp_obj_t self_in, mp_print_
STATIC mp_obj_t pyb_timer_init_helper(pyb_timer_obj_t *tim, mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_mode, MP_ARG_REQUIRED | MP_ARG_INT, },
{ MP_QSTR_width, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 32} },
{ MP_QSTR_width, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 16} },
};
// parse args
@ -405,7 +406,7 @@ STATIC mp_obj_t pyb_timer_deinit(mp_obj_t self_in) {
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(pyb_timer_deinit_obj, pyb_timer_deinit);
/// \method channel(channel, *, freq, polarity, duty_cycle)
/// \method channel(channel, *, freq, period, polarity, duty_cycle)
/// Initialise the timer channel. Initialization requires at least a frequency param. With no
/// extra params given besides the channel id, the channel is returned with the previous configuration
/// os 'None', if it hasn't been initialized before.
@ -735,7 +736,7 @@ STATIC mp_obj_t pyb_timer_channel_duty_cycle(mp_uint_t n_args, const mp_obj_t *a
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pyb_timer_channel_duty_cycle_obj, 1, 3, pyb_timer_channel_duty_cycle);
/// \method callback(handler, value, priority)
/// \method callback(handler, priority, value)
/// create a callback object associated with the timer channel
STATIC mp_obj_t pyb_timer_channel_callback (mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
mp_arg_val_t args[mpcallback_INIT_NUM_ARGS];
@ -753,10 +754,21 @@ STATIC mp_obj_t pyb_timer_channel_callback (mp_uint_t n_args, const mp_obj_t *po
goto invalid_args;
}
uint32_t _config = (ch->channel == TIMER_B) ? ((ch->timer->config & TIMER_B) >> 8) : (ch->timer->config & TIMER_A);
// validate and set the value if we are in edge count mode
if (_config == TIMER_CFG_A_CAP_COUNT) {
uint32_t c_value = args[3].u_int;
if (!c_value || c_value > 0xFFFF) {
// zero or exceeds the maximum value of a 16-bit timer
goto invalid_args;
}
MAP_TimerMatchSet(ch->timer->timer, ch->channel, c_value);
}
// disable the callback first
pyb_timer_channel_callback_disable(ch);
uint32_t _config = (ch->channel == TIMER_B) ? ((ch->timer->config & TIMER_B) >> 8) : (ch->timer->config & TIMER_A);
uint8_t shift = (ch->channel == TIMER_B) ? 8 : 0;
switch (_config) {
case TIMER_CFG_A_ONE_SHOT:
@ -778,14 +790,10 @@ STATIC mp_obj_t pyb_timer_channel_callback (mp_uint_t n_args, const mp_obj_t *po
default:
break;
}
// special case for a 32-bit timer
if (ch->channel == (TIMER_A | TIMER_B)) {
// again a special case for the pwm match interrupt
if (_config == TIMER_CFG_A_PWM) {
ch->timer->intflags |= TIMER_TIMB_MATCH;
} else {
ch->timer->intflags |= (ch->timer->intflags << 8);
}
}
void (*pfnHandler)(void);
uint32_t intregister;
@ -835,6 +843,12 @@ STATIC mp_obj_t pyb_timer_channel_callback (mp_uint_t n_args, const mp_obj_t *po
// create the callback
_callback = mpcallback_new (ch, args[1].u_obj, &pyb_timer_channel_cb_methods);
// reload the timer
uint32_t period_c;
uint32_t match;
compute_prescaler_period_and_match_value(ch, &period_c, &match);
MAP_TimerLoadSet(ch->timer->timer, ch->channel, period_c);
// enable the callback before returning
pyb_timer_channel_callback_enable(ch);
}

8
docs/library/pyb.Pin.rst
View File

@ -262,9 +262,9 @@ Methods
Return a 5-tuple with the configuration of the pin:
``(name, alternate-function, mode, type, strength)``
.. method:: pin.callback(mode, priority=1, handler=None, wakes=pyb.Sleep.ACTIVE)
.. method:: pin.callback(\*, mode, priority=1, handler=None, wakes=pyb.Sleep.ACTIVE)
Create a callback to be triggered when data is received on the UART.
Create a callback to be triggered when the input level at the pin changes.
- ``mode`` configures the pin level which can generate an interrupt. Possible values are:
@ -286,8 +286,8 @@ Methods
of this pins can be enabled as a wake source at the same time, so, only
the last enabled pin as a ``pyb.Sleep.SUSPENDED`` wake source will have effect.
- If ``wakes=pyb.Sleep.SUSPENDED`` pins ``GPIO2``, ``GPIO4``, ``GPIO10``,
``GPIO11``, GPIO17`` and ``GPIO24`` can wake the board. In this case all this 6
pins can be enabled as a ``pyb.Sleep.HIBERNATE`` wake source at the same time.
``GPIO11``, ``GPIO17`` and ``GPIO24`` can wake the board. In this case all of the
6 pins can be enabled as a ``pyb.Sleep.HIBERNATE`` wake source at the same time.
- Values can be ORed to make a pin generate interrupts in more than one power
mode.

10
docs/library/pyb.RTC.rst
View File

@ -32,6 +32,8 @@ Methods
date and time. With 1 argument (being an 8-tuple) it sets the date
and time.
.. only:: port_pyboard
The 8-tuple has the following format:
(year, month, day, weekday, hours, minutes, seconds, subseconds)
@ -40,6 +42,14 @@ Methods
``subseconds`` counts down from 255 to 0
.. only:: port_wipy
The 8-tuple has the following format:
``(year, month, day, weekday, hours, minutes, seconds, milliseconds)``
``weekday`` is 0-6 for Monday through Sunday.
.. only:: port_pyboard
.. method:: rtc.wakeup(timeout, callback=None)

2
docs/library/pyb.SD.rst
View File

@ -15,7 +15,7 @@ Example usage::
# data, clk and cmd pins must be passed along with
# their respective alternate functions
sd = pyb.SD('GPIO15', 8, 'GPIO16', 8, 'GPIO17', 8)
sd = pyb.SD('GPIO15', 8, 'GPIO10', 6, 'GPIO11', 6)
sd.enable() # enable and mount the SD card
sd.disable() # disable and unmount it

287
docs/library/pyb.Timer.rst
View File

@ -3,6 +3,8 @@
class Timer -- control internal timers
======================================
.. only:: port_pyboard
Timers can be used for a great variety of tasks. At the moment, only
the simplest case is implemented: that of calling a function periodically.
@ -39,30 +41,171 @@ Further examples::
the servo driver, and Timer 6 is used for timed ADC/DAC reading/writing.
It is recommended to use the other timers in your programs.
.. only:: port_wipy
Timers can be used for a great variety of tasks, calling a function periodically,
counting events, and generating a PWM signal are among the most common use cases.
Each timer consists of 2 16-bit channels and this channels can be tied together to
form 1 32-bit timer. The operating mode needs to be configured per timer, but then
the period (or the frequency) can be independently configured on each channel.
By using the callback method, the timer event can call a Python function.
Example usage to toggle an LED at a fixed frequency::
tim = pyb.Timer(4) # create a timer object using timer 4
tim.init(mode=Timer.PERIODIC) # initialize it in periodic mode
tim_ch = tim.channel(Timer.A, freq=2) # configure channel A at a frequency of 2Hz
tim_ch.callback(handler=lambda t:led.toggle()) # toggle a LED on every cycle of the timer
Example using named function for the callback::
tim = Timer(1, mode=Timer.PERIODIC)
tim_a = tim.channel(Timer.A, freq=1000)
led = Pin('GPIO2', af=0, mode=Pin.OUT)
def tick(timer): # we will receive the timer object when being called
print(timer.time()) # show current timer's time value (is microseconds)
led.toggle() # toggle the LED
tim_a.callback(handler=tick)
Further examples::
tim1 = pyb.Timer(2, mode=Timer.EVENT_COUNT) # initialize it capture mode
tim2 = pyb.Timer(1, mode=Timer.PWM) # initialize it in PWM mode
tim_ch = tim1.channel(Timer.A, freq=1, polarity=Timer.POSITIVE) # start the event counter with a frequency of 1Hz and triggered by positive edges
tim_ch = tim2.channel(Timer.B, freq=10000, duty_cycle=50) # start the PWM on channel B with a 50% duty cycle
tim_ch.time() # get the current time in usec (can also be set)
tim_ch.freq(20) # set the frequency (can also get)
tim_ch.duty_cycle(30) # set the duty cycle to 30% (can also get)
tim_ch.duty_cycle(30, Timer.NEGATIVE) # set the duty cycle to 30% and change the polarity to negative
tim_ch.event_count() # get the number of captured events
tim_ch.event_time() # get the the time of the last captured event
tim_ch.period(2000000) # change the period to 2 seconds
*Note:* Memory can't be allocated during a callback (an interrupt) and so
exceptions raised within a callback don't give much information. See
:func:`micropython.alloc_emergency_exception_buf` for how to get around this
limitation.
Constructors
------------
.. class:: pyb.Timer(id, ...)
.. only:: port_pyboard
Construct a new timer object of the given id. If additional
arguments are given, then the timer is initialised by ``init(...)``.
``id`` can be 1 to 14, excluding 3.
.. only:: port_wipy
Construct a new timer object of the given id. If additional
arguments are given, then the timer is initialised by ``init(...)``.
``id`` can be 1 to 4.
Methods
-------
.. only:: port_pyboard
.. method:: timer.init(\*, freq, prescaler, period)
Initialise the timer. Initialisation must be either by frequency (in Hz)
or by prescaler and period::
tim.init(freq=100) # set the timer to trigger at 100Hz
tim.init(prescaler=83, period=999) # set the prescaler and period directly
Keyword arguments:
- ``freq`` --- specifies the periodic frequency of the timer. You migh also
view this as the frequency with which the timer goes through one complete cycle.
- ``prescaler`` [0-0xffff] - specifies the value to be loaded into the
timer's Prescaler Register (PSC). The timer clock source is divided by
(``prescaler + 1``) to arrive at the timer clock. Timers 2-7 and 12-14
have a clock source of 84 MHz (pyb.freq()[2] \* 2), and Timers 1, and 8-11
have a clock source of 168 MHz (pyb.freq()[3] \* 2).
- ``period`` [0-0xffff] for timers 1, 3, 4, and 6-15. [0-0x3fffffff] for timers 2 & 5.
Specifies the value to be loaded into the timer's AutoReload
Register (ARR). This determines the period of the timer (i.e. when the
counter cycles). The timer counter will roll-over after ``period + 1``
timer clock cycles.
- ``mode`` can be one of:
- ``Timer.UP`` - configures the timer to count from 0 to ARR (default)
- ``Timer.DOWN`` - configures the timer to count from ARR down to 0.
- ``Timer.CENTER`` - confgures the timer to count from 0 to ARR and
then back down to 0.
- ``div`` can be one of 1, 2, or 4. Divides the timer clock to determine
the sampling clock used by the digital filters.
- ``callback`` - as per Timer.callback()
- ``deadtime`` - specifies the amount of "dead" or inactive time between
transitions on complimentary channels (both channels will be inactive)
for this time). ``deadtime`` may be an integer between 0 and 1008, with
the following restrictions: 0-128 in steps of 1. 128-256 in steps of
2, 256-512 in steps of 8, and 512-1008 in steps of 16. ``deadime``
measures ticks of ``source_freq`` divided by ``div`` clock ticks.
``deadtime`` is only available on timers 1 and 8.
You must either specify freq or both of period and prescaler.
.. only:: port_wipy
.. method:: timer.init(mode, \*, width=16)
Initialise the timer. Example::
tim.init(Timer.PERIODIC) # periodic 16-bit timer
tim.init(Timer.ONE_SHOT, width=32) # one shot 32-bit timer
Keyword arguments:
- ``mode`` can be one of:
- ``Timer.ONE_SHOT`` - The timer runs once until the configured
period of the channel expires.
- ``Timer.PERIODIC`` - The timer runs periodically at the configured
frequency of the channel.
- ``Timer.EDGE_TIME`` - Meaure the time pin level changes.
- ``Timer.EDGE_COUNT`` - Count the number of pin level changes.
- ``width`` must be either 16 or 32 (bits). For really low frequencies <= ~1Hz
(or large periods), 32-bit timers should be used. 32-bit mode is only available
for ``ONE_SHOT`` AND ``PERIODIC`` modes.
.. method:: timer.deinit()
Deinitialises the timer.
.. only:: port_pyboard
Disables the callback (and the associated irq).
Disables any channel callbacks (and the associated irq).
Stops the timer, and disables the timer peripheral.
.. only:: port_pyboard
.. method:: timer.callback(fun)
Set the function to be called when the timer triggers.
``fun`` is passed 1 argument, the timer object.
If ``fun`` is ``None`` then the callback will be disabled.
.. only:: port_pyboard
.. method:: timer.channel(channel, mode, ...)
If only a channel number is passed, then a previously initialized channel
@ -137,68 +280,50 @@ Methods
ch2 = timer.channel(2, pyb.Timer.PWM, pin=pyb.Pin.board.X2, pulse_width=8000)
ch3 = timer.channel(3, pyb.Timer.PWM, pin=pyb.Pin.board.X3, pulse_width=16000)
.. only:: port_wipy
.. method:: timer.channel(channel, \**, freq, period, polarity=Timer.POSITIVE, duty_cycle=0)
If only a channel identifier passed, then a previously initialized channel
object is returned (or ``None`` if there is no previous channel).
Othwerwise, a TimerChannel object is initialized and returned.
The operating mode is is the one configured to the Timer object that was used to
create the channel.
- ``channel`` if the width of the timer is 16-bit, then must be either ``TIMER.A``, ``TIMER.B``.
If the width is 32-bit then it **must be** ``TIMER.A | TIMER.B``.
Keyword only arguments:
- ``freq`` sets the frequency in Hz.
- ``period`` sets the period in microseconds.
.. note::
Either ``freq`` or ``period`` must be given, never both.
- ``polarity`` this is applicable for:
- ``PWM``, defines the polarity of the duty cycle
- ``EDGE_TIME`` and ``EDGE_COUNT``, defines the polarity of the pin level change to detect.
To detect both rising and falling edges, make ``polarity=Timer.POSITIVE | Timer.NEGATIVE``.
- ``duty_cycle`` only applicable to ``PWM``. It's a percentage (0-100)
.. only:: port_pyboard
.. method:: timer.counter([value])
Get or set the timer counter.
.. method:: timer.deinit()
Deinitialises the timer.
Disables the callback (and the associated irq).
Disables any channel callbacks (and the associated irq).
Stops the timer, and disables the timer peripheral.
.. only:: port_pyboard
.. method:: timer.freq([value])
Get or set the frequency for the timer (changes prescaler and period if set).
.. method:: timer.init(\*, freq, prescaler, period)
Initialise the timer. Initialisation must be either by frequency (in Hz)
or by prescaler and period::
tim.init(freq=100) # set the timer to trigger at 100Hz
tim.init(prescaler=83, period=999) # set the prescaler and period directly
Keyword arguments:
- ``freq`` --- specifies the periodic frequency of the timer. You migh also
view this as the frequency with which the timer goes through one complete cycle.
- ``prescaler`` [0-0xffff] - specifies the value to be loaded into the
timer's Prescaler Register (PSC). The timer clock source is divided by
(``prescaler + 1``) to arrive at the timer clock. Timers 2-7 and 12-14
have a clock source of 84 MHz (pyb.freq()[2] \* 2), and Timers 1, and 8-11
have a clock source of 168 MHz (pyb.freq()[3] \* 2).
- ``period`` [0-0xffff] for timers 1, 3, 4, and 6-15. [0-0x3fffffff] for timers 2 & 5.
Specifies the value to be loaded into the timer's AutoReload
Register (ARR). This determines the period of the timer (i.e. when the
counter cycles). The timer counter will roll-over after ``period + 1``
timer clock cycles.
- ``mode`` can be one of:
- ``Timer.UP`` - configures the timer to count from 0 to ARR (default)
- ``Timer.DOWN`` - configures the timer to count from ARR down to 0.
- ``Timer.CENTER`` - confgures the timer to count from 0 to ARR and
then back down to 0.
- ``div`` can be one of 1, 2, or 4. Divides the timer clock to determine
the sampling clock used by the digital filters.
- ``callback`` - as per Timer.callback()
- ``deadtime`` - specifies the amount of "dead" or inactive time between
transitions on complimentary channels (both channels will be inactive)
for this time). ``deadtime`` may be an integer between 0 and 1008, with
the following restrictions: 0-128 in steps of 1. 128-256 in steps of
2, 256-512 in steps of 8, and 512-1008 in steps of 16. ``deadime``
measures ticks of ``source_freq`` divided by ``div`` clock ticks.
``deadtime`` is only available on timers 1 and 8.
You must either specify freq or both of period and prescaler.
.. only:: port_pyboard
.. method:: timer.period([value])
@ -222,12 +347,42 @@ TimerChannel objects are created using the Timer.channel() method.
Methods
-------
.. only:: port_pyboard
.. method:: timerchannel.callback(fun)
Set the function to be called when the timer channel triggers.
``fun`` is passed 1 argument, the timer object.
If ``fun`` is ``None`` then the callback will be disabled.
.. only:: port_wipy
.. method:: timerchannel.callback(\**, value, priority=1, handler=None)
The behavior of this callback is heaviliy dependent on the operating
mode of the timer channel:
- If mode is ``Timer.PERIODIC`` the callback is executed periodically
with the configured frequency or period.
- If mode is ``Timer.ONE_SHOT`` the callback is executed once when
the configured timer expires.
- If mode is ``Timer.EDGE_COUNT`` the callback is executed when reaching
the configured number of events (see ``value`` param below).
- If mode is ``Timer.PWM`` the callback is executed when reaching the duty
cycle value.
The accepted params are:
- ``priority`` level of the interrupt. Can take values in the range 1-7.
Higher values represent higher priorities.
- ``handler`` is an optional function to be called when the interrupt is triggered.
- ``value`` is **only valid** when in ``Timer.EDGE_COUNT`` mode and is used to set
the number of edge events that will trigger the interrupt.
Returns a callback object.
.. only:: port_pyboard
.. method:: timerchannel.capture([value])
Get or set the capture value associated with a channel.
@ -256,3 +411,29 @@ Methods
for which the pulse is active. The value can be an integer or
floating-point number for more accuracy. For example, a value of 25 gives
a duty cycle of 25%.
.. only:: port_wipy
.. method:: timerchannel.freq([value])
Get or set the timer channel frequency (in Hz).
.. method:: timerchannel.period([value])
Get or set the timer channel period (in microseconds).
.. method:: timerchannel.time([value])
Get or set the timer channel current **time** value (in microseconds).
.. method:: timerchannel.event_count()
Get the number of edge events counted.
.. method:: timerchannel.event_time()
Get the time of ocurrance of the last event.
.. method:: timerchannel.duty_cycle([value])
Get or set the duty cycle of the PWM signal (in the range of 0-100).

6
docs/library/pyb.rst
View File

@ -247,7 +247,7 @@ Miscellaneous functions
.. function:: repl_uart(uart)
Get or set the UART object that the REPL is repeated on.
Get or set the UART object where the REPL is repeated on.
.. only:: port_pyboard
@ -269,13 +269,13 @@ Miscellaneous functions
.. function:: unique_id()
Returns a string of 12 bytes (96 bits), which is the unique ID for the MCU.
Returns a string of 12 bytes (96 bits), which is the unique ID of the MCU.
.. only:: port_wipy
.. function:: unique_id()
Returns a string of 6 bytes (48 bits), which is the unique ID for the MCU.
Returns a string of 6 bytes (48 bits), which is the unique ID of the MCU.
This also corresponds to the ``MAC address`` of the WiPy.
Classes

2
docs/library/uhashlib.rst
View File

@ -43,7 +43,7 @@ Constructors
:class: attention
Due to hardware implementation details of the WiPy, data must be buffered before being
digested, which would make impossible to calculate the hash of big blocks of data that
digested, which would make it impossible to calculate the hash of big blocks of data that
do not fit in RAM. In this case, since most likely the total size of the data is known
in advance, the size can be passed to the constructor and hence the HASH hardware engine
of the WiPy can be properly initialized without needing buffering. If ``block_size`` is

2
docs/pyboard/quickref.rst
View File

@ -1,5 +1,3 @@
.. only:: port_pyboard
.. _quickref:
Quick reference for the pyboard

12
docs/wipy/general.rst
View File

@ -35,12 +35,12 @@ If you power up normally, or press the reset button, the WiPy will boot
into standard mode: the ``boot.py`` file will be executed first, then
``main.py`` will run.
You can override this boot sequence by pulling ``GPIO28`` **up** during reset.
The heart beat LED will flash slowly 3 times to signal that safe boot is being
requested, and then 3 more times quickly to let you know that safe boot is
going to be performed. While safe booting, the WiPy runs the factory firmware
and skips the execution of ``boot.py`` and ``main.py``. This is useful to
recover from any crash situation.
You can override this boot sequence by pulling ``GPIO28`` **up** (connect
it to the 3v3 output pin) during reset. The heart beat LED will flash slowly
3 times to signal that safe boot is being requested, and then 3 more times
quickly to let you know that safe boot is going to be performed. While safe
booting, the WiPy runs the factory firmware and skips the execution of
``boot.py`` and ``main.py``. This is useful to recover from any crash situation.
The heart beat LED
------------------

16
docs/wipy/quickref.rst
View File

@ -1,5 +1,3 @@
.. only:: port_wipy
.. _quickref_:
Quick reference for the WiPy
@ -20,7 +18,7 @@ See :mod:`pyb`. ::
pyb.delay(50) # wait 50 milliseconds
pyb.millis() # number of milliseconds since boot-up
pyb.freq() # get the CPU frequency
pyb.unique_id() # return the 6-byte unique id of the board (it's MAC address)
pyb.unique_id() # return the 6-byte unique id of the board (the WiPy's MAC address)
Pins and GPIO
-------------
@ -176,7 +174,7 @@ See :ref:`pyb.SD <pyb.SD>`. ::
# SD card pins need special configuration so we pass 'em to the constructor
# data pin, data af, clock pin, clock af, cmd pin, cmd af
sd = SD('GPIO15', 8, 'GPIO16', 8, 'GPIO17', 8)
sd = pyb.SD('GPIO15', 8, 'GPIO10', 6, 'GPIO11', 6)
sd.enable()
WLAN (WiFi)
@ -213,16 +211,16 @@ See ``pyb.Sleep``. ::
Sleep.suspend() # everything except for WLAN is powered down (~950uA)
# wakes from Pin, RTC or WLAN
Sleep.hibernate() # deepest sleep mode, mcu starts from reset. Wakes from Pin and RTC.
Sleep.hibernate() # deepest sleep mode, MCU starts from reset. Wakes from Pin and RTC.
Heart beat LED
-----------------------------
--------------
See :ref:`pyb.HeartBeat <pyb.HeartBeat>`. ::
from pyb import HeartBeat
# disable the heart beat indication (you are free to use this led connected to GPIO25)
HeartBeat.disable()
# disable the heart beat indication (you are free to use this LED connected to GPIO25)
HeartBeat().disable()
# enable the heart beat again
HeartBeat.enable()
HeartBeat().enable()