1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
|
.. currentmodule:: esp32
:mod:`esp32` --- functionality specific to the ESP32
====================================================
.. module:: esp32
:synopsis: functionality specific to the ESP32
The ``esp32`` module contains functions and classes specifically aimed at
controlling ESP32 modules.
Functions
---------
.. function:: wake_on_touch(wake)
Configure whether or not a touch will wake the device from sleep.
*wake* should be a boolean value.
.. function:: wake_on_ext0(pin, level)
Configure how EXT0 wakes the device from sleep. *pin* can be ``None``
or a valid Pin object. *level* should be ``esp32.WAKEUP_ALL_LOW`` or
``esp32.WAKEUP_ANY_HIGH``.
.. function:: wake_on_ext1(pins, level)
Configure how EXT1 wakes the device from sleep. *pins* can be ``None``
or a tuple/list of valid Pin objects. *level* should be ``esp32.WAKEUP_ALL_LOW``
or ``esp32.WAKEUP_ANY_HIGH``.
.. function:: raw_temperature()
Read the raw value of the internal temperature sensor, returning an integer.
.. function:: hall_sensor()
Read the raw value of the internal Hall sensor, returning an integer.
Flash partitions
----------------
This class gives access to the partitions in the device's flash memory.
.. class:: Partition(id)
Create an object representing a partition. *id* can be a string which is the label
of the partition to retrieve, or one of the constants: ``BOOT`` or ``RUNNING``.
.. classmethod:: Partition.find(type=TYPE_APP, subtype=0xff, label=None)
Find a partition specified by *type*, *subtype* and *label*. Returns a
(possibly empty) list of Partition objects.
.. method:: Partition.info()
Returns a 6-tuple ``(type, subtype, addr, size, label, encrypted)``.
.. method:: Partition.readblocks(block_num, buf)
.. method:: Partition.readblocks(block_num, buf, offset)
.. method:: Partition.writeblocks(block_num, buf)
.. method:: Partition.writeblocks(block_num, buf, offset)
.. method:: Partition.ioctl(cmd, arg)
These methods implement the simple and :ref:`extended
<block-device-interface>` block protocol defined by
:class:`uos.AbstractBlockDev`.
.. method:: Partition.set_boot()
Sets the partition as the boot partition.
.. method:: Partition.get_next_update()
Gets the next update partition after this one, and returns a new Partition object.
Constants
~~~~~~~~~
.. data:: Partition.BOOT
Partition.RUNNING
Used in the `Partition` constructor to fetch various partitions.
.. data:: Partition.TYPE_APP
Partition.TYPE_DATA
Used in `Partition.find` to specify the partition type.
.. _esp32.RMT:
RMT
---
The RMT (Remote Control) module, specific to the ESP32, was originally designed
to send and receive infrared remote control signals. However, due to a flexible
design and very accurate (as low as 12.5ns) pulse generation, it can also be
used to transmit or receive many other types of digital signals::
import esp32
from machine import Pin
r = esp32.RMT(0, pin=Pin(18), clock_div=8)
r # RMT(channel=0, pin=18, source_freq=80000000, clock_div=8)
# The channel resolution is 100ns (1/(source_freq/clock_div)).
r.write_pulses((1, 20, 2, 40), start=0) # Send 0 for 100ns, 1 for 2000ns, 0 for 200ns, 1 for 4000ns
The input to the RMT module is an 80MHz clock (in the future it may be able to
configure the input clock but, for now, it's fixed). ``clock_div`` *divides*
the clock input which determines the resolution of the RMT channel. The
numbers specificed in ``write_pulses`` are multiplied by the resolution to
define the pulses.
``clock_div`` is an 8-bit divider (0-255) and each pulse can be defined by
multiplying the resolution by a 15-bit (0-32,768) number. There are eight
channels (0-7) and each can have a different clock divider.
So, in the example above, the 80MHz clock is divided by 8. Thus the
resolution is (1/(80Mhz/8)) 100ns. Since the ``start`` level is 0 and toggles
with each number, the bitstream is ``0101`` with durations of [100ns, 2000ns,
100ns, 4000ns].
For more details see Espressif's `ESP-IDF RMT documentation.
<https://docs.espressif.com/projects/esp-idf/en/latest/api-reference/peripherals/rmt.html>`_.
.. Warning::
The current MicroPython RMT implementation lacks some features, most notably
receiving pulses and carrier transmit. RMT should be considered a
*beta feature* and the interface may change in the future.
.. class:: RMT(channel, \*, pin=None, clock_div=8)
This class provides access to one of the eight RMT channels. *channel* is
required and identifies which RMT channel (0-7) will be configured. *pin*,
also required, configures which Pin is bound to the RMT channel. *clock_div*
is an 8-bit clock divider that divides the source clock (80MHz) to the RMT
channel allowing the resolution to be specified.
.. method:: RMT.source_freq()
Returns the source clock frequency. Currently the source clock is not
configurable so this will always return 80MHz.
.. method:: RMT.clock_div()
Return the clock divider. Note that the channel resolution is
``1 / (source_freq / clock_div)``.
.. method:: RMT.wait_done(timeout=0)
Returns True if `RMT.write_pulses` has completed.
If *timeout* (defined in ticks of ``source_freq / clock_div``) is specified
the method will wait for *timeout* or until `RMT.write_pulses` is complete,
returning ``False`` if the channel continues to transmit.
.. Warning::
Avoid using ``wait_done()`` if looping is enabled.
.. method:: RMT.loop(enable_loop)
Configure looping on the channel, allowing a stream of pulses to be
indefinitely repeated. *enable_loop* is bool, set to True to enable looping.
.. method:: RMT.write_pulses(pulses, start)
Begin sending *pulses*, a list or tuple defining the stream of pulses. The
length of each pulse is defined by a number to be multiplied by the channel
resolution ``(1 / (source_freq / clock_div))``. *start* defines whether the
stream starts at 0 or 1.
The Ultra-Low-Power co-processor
--------------------------------
.. class:: ULP()
This class provides access to the Ultra-Low-Power co-processor.
.. method:: ULP.set_wakeup_period(period_index, period_us)
Set the wake-up period.
.. method:: ULP.load_binary(load_addr, program_binary)
Load a *program_binary* into the ULP at the given *load_addr*.
.. method:: ULP.run(entry_point)
Start the ULP running at the given *entry_point*.
Constants
---------
.. data:: esp32.WAKEUP_ALL_LOW
esp32.WAKEUP_ANY_HIGH
Selects the wake level for pins.
|
