Pycom FiPy, Руководство пользователя, Страница: 290 / 496

If an RMT object needs to be reconfigured from RX/TX to TX/RX, then either first
deinit()
must be called or the
init()
again with the desired configuration.
rmt.pulses_get(pulses, timeout)
Reads in pulses from the GPIO pin.
pulses
if not specified, this function will keep reading pulses until the
rx_idle_threshold
is exceeded. If it is specified this function will return the exactly that
number of pulses, ignoring anything shorter than
rx_filter_threshold
or longer than
rx_idle_threshold
.
timeout
is specified, this function will return if the first pulse does not occur within
timeout
microseconds. If not specified, it will wait indefinitely.
Return value: Tuple of items with the following structure: (level, duration):
level
represents the level of the received bit/pulse, can be 0 or 1.
duration
represents the duration of the received pulse, the time unit (resolution)
depends on the selected channel.
Maximum of 128 pulses can be received in a row without receiving "idle" signal. If the
incoming pulse sequence contains more than 128 pulses the rest is dropped and the
receiver waits for another sequence of pulses. The
pulses_get
function can be called
to receive more than 128 pulses, however the above mentioned limitation should be
kept in mind when evaluating the received data.
rmt.pulses_send(duration, data, start_level)
Generates pulses as defined by the parameters below
duration
represents the duration of the pulses to be sent, the time unit (resolution)
depends on the selected channel.
data
Tuple that represents the sequence of pulses to be sent, must be composed of 0
or 1 elements.
start_level
defines the state (HIGH/LOW) of the first pulse given by
duration
if
data
is not given.
data
must be a tuple and
duration
can be a tuple or a single number, with
data
being
optional. In the case that only
duration
is provided, it must be a tuple and you must also
provide
start_level
which will dictate the level of the first duration, the signal level then
toggles between each duration value. If
data
is provided and
duration
is a single number,
5.2.1.13 RMT
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