kopia lustrzana https://github.com/micropython/micropython
docs: Add initial docs for esp32 port, including quick-ref and general.
With contributions from Oliver Robson (@HowManyOliversAreThere), Sean Lanigan (@seanlano) and @rprr.pull/3464/head
Matt Trentini
Damien George
rodzic
f874e8184c
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.. _esp32_general:
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General information about the ESP32 port
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========================================
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The ESP32 is a popular WiFi and Bluetooth enabled System-on-Chip (SoC) by
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Espressif Systems.
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Multitude of boards
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-------------------
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There is a multitude of modules and boards from different sources which carry
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the ESP32 chip. MicroPython tries to provide a generic port which would run on
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as many boards/modules as possible, but there may be limitations. Espressif
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development boards are taken as reference for the port (for example, testing is
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performed on them). For any board you are using please make sure you have a
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datasheet, schematics and other reference materials so you can look up any
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board-specific functions.
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To make a generic ESP32 port and support as many boards as possible the
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following design and implementation decision were made:
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* GPIO pin numbering is based on ESP32 chip numbering. Please have the manual/pin
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diagram of your board at hand to find correspondence between your board pins and
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actual ESP32 pins.
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* All pins are supported by MicroPython but not all are usable on any given board.
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For example pins that are connected to external SPI flash should not be used,
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and a board may only expose a certain selection of pins.
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Technical specifications and SoC datasheets
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-------------------------------------------
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The datasheets and other reference material for ESP32 chip are available
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from the vendor site: https://www.espressif.com/en/support/download/documents?keys=esp32 .
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They are the primary reference for the chip technical specifications, capabilities,
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operating modes, internal functioning, etc.
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For your convenience, some of technical specifications are provided below:
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* Architecture: Xtensa Dual-Core 32-bit LX6
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* CPU frequency: up to 240MHz
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* Total RAM available: 528KB (part of it reserved for system)
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* BootROM: 448KB
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* Internal FlashROM: none
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* External FlashROM: code and data, via SPI Flash; usual size 4MB
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* GPIO: 34 (GPIOs are multiplexed with other functions, including
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external FlashROM, UART, etc.)
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* UART: 3 RX/TX UART (no hardware handshaking), one TX-only UART
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* SPI: 4 SPI interfaces (one used for FlashROM)
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* I2C: 2 I2C (bitbang implementation available on any pins)
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* I2S: 2
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* ADC: 12-bit SAR ADC up to 18 channels
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* DAC: 2 8-bit DACs
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* Programming: using BootROM bootloader from UART - due to external FlashROM
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and always-available BootROM bootloader, the ESP32 is not brickable
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For more information see the ESP32 datasheet: https://www.espressif.com/sites/default/files/documentation/esp32_datasheet_en.pdf
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MicroPython is implemented on top of the ESP-IDF, Espressif's development
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framework for the ESP32. This is a FreeRTOS based system. See the
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`ESP-IDF Programming Guide <https://docs.espressif.com/projects/esp-idf/en/latest/index.html>`_
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for details.
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Plik binarny nie jest wyświetlany.
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Po Szerokość: | Wysokość: | Rozmiar: 84 KiB |
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.. _esp32_quickref:
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Quick reference for the ESP32
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=============================
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.. image:: img/esp32.jpg
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:alt: ESP32 board
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:width: 640px
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The Espressif ESP32 Development Board (image attribution: Adafruit).
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Below is a quick reference for ESP32-based boards. If it is your first time
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working with this board it may be useful to get an overview of the microcontroller:
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.. toctree::
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:maxdepth: 1
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general.rst
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tutorial/intro.rst
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Installing MicroPython
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----------------------
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See the corresponding section of tutorial: :ref:`esp32_intro`. It also includes
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a troubleshooting subsection.
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General board control
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---------------------
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The MicroPython REPL is on UART0 (GPIO1=TX, GPIO3=RX) at baudrate 115200.
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Tab-completion is useful to find out what methods an object has.
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Paste mode (ctrl-E) is useful to paste a large slab of Python code into
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the REPL.
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The :mod:`machine` module::
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import machine
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machine.freq() # get the current frequency of the CPU
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machine.freq(240000000) # set the CPU frequency to 240 MHz
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The :mod:`esp` module::
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import esp
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esp.osdebug(None) # turn off vendor O/S debugging messages
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esp.osdebug(0) # redirect vendor O/S debugging messages to UART(0)
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# low level methods to interact with flash storage
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esp.flash_size()
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esp.flash_user_start()
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esp.flash_erase(sector_no)
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esp.flash_write(byte_offset, buffer)
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esp.flash_read(byte_offset, buffer)
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The :mod:`esp32` module::
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import esp32
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esp32.hall_sensor() # read the internal hall sensor
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esp32.raw_temperature() # read the internal temperature of the MCU, in Farenheit
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esp32.ULP() # access to the Ultra-Low-Power Co-processor
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Note that the temperature sensor in the ESP32 will typically read higher than
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ambient due to the IC getting warm while it runs. This effect can be minimised
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by reading the temperature sensor immediately after waking up from sleep.
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Networking
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----------
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The :mod:`network` module::
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import network
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wlan = network.WLAN(network.STA_IF) # create station interface
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wlan.active(True) # activate the interface
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wlan.scan() # scan for access points
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wlan.isconnected() # check if the station is connected to an AP
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wlan.connect('essid', 'password') # connect to an AP
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wlan.config('mac') # get the interface's MAC adddress
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wlan.ifconfig() # get the interface's IP/netmask/gw/DNS addresses
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ap = network.WLAN(network.AP_IF) # create access-point interface
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ap.config(essid='ESP-AP') # set the ESSID of the access point
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ap.active(True) # activate the interface
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A useful function for connecting to your local WiFi network is::
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def do_connect():
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import network
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wlan = network.WLAN(network.STA_IF)
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wlan.active(True)
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if not wlan.isconnected():
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print('connecting to network...')
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wlan.connect('essid', 'password')
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while not wlan.isconnected():
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pass
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print('network config:', wlan.ifconfig())
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Once the network is established the :mod:`socket <usocket>` module can be used
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to create and use TCP/UDP sockets as usual, and the ``urequests`` module for
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convenient HTTP requests.
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Delay and timing
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----------------
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Use the :mod:`time <utime>` module::
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import time
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time.sleep(1) # sleep for 1 second
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time.sleep_ms(500) # sleep for 500 milliseconds
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time.sleep_us(10) # sleep for 10 microseconds
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start = time.ticks_ms() # get millisecond counter
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delta = time.ticks_diff(time.ticks_ms(), start) # compute time difference
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Timers
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------
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Virtual (RTOS-based) timers are supported. Use the :ref:`machine.Timer <machine.Timer>` class
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with timer ID of -1::
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from machine import Timer
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tim = Timer(-1)
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tim.init(period=5000, mode=Timer.ONE_SHOT, callback=lambda t:print(1))
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tim.init(period=2000, mode=Timer.PERIODIC, callback=lambda t:print(2))
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The period is in milliseconds.
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Pins and GPIO
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-------------
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Use the :ref:`machine.Pin <machine.Pin>` class::
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from machine import Pin
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p0 = Pin(0, Pin.OUT) # create output pin on GPIO0
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p0.on() # set pin to "on" (high) level
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p0.off() # set pin to "off" (low) level
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p0.value(1) # set pin to on/high
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p2 = Pin(2, Pin.IN) # create input pin on GPIO2
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print(p2.value()) # get value, 0 or 1
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p4 = Pin(4, Pin.IN, Pin.PULL_UP) # enable internal pull-up resistor
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p5 = Pin(5, Pin.OUT, value=1) # set pin high on creation
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Available Pins are from the following ranges (inclusive): 0-19, 21-23, 25-27, 32-39.
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These correspond to the actual GPIO pin numbers of ESP32 chip. Note that many
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end-user boards use their own adhoc pin numbering (marked e.g. D0, D1, ...).
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For mapping between board logical pins and physical chip pins consult your board
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documentation.
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Notes:
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* Pins 1 and 3 are REPL UART TX and RX respectively
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* Pins 6, 7, 8, 11, 16, and 17 are used for connecting the embedded flash,
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and are not recommended for other uses
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* Pins 34-39 are input only, and also do not have internal pull-up resistors
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PWM (pulse width modulation)
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----------------------------
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PWM can be enabled on all output-enabled pins. The base frequency can
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range from 1Hz to 40MHz but there is a tradeoff; as the base frequency
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*increases* the duty resolution *decreases*. See
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`LED Control <https://docs.espressif.com/projects/esp-idf/en/latest/api-reference/peripherals/ledc.html>`_
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for more details.
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Use the ``machine.PWM`` class::
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from machine import Pin, PWM
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pwm0 = PWM(Pin(0)) # create PWM object from a pin
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pwm0.freq() # get current frequency
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pwm0.freq(1000) # set frequency
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pwm0.duty() # get current duty cycle
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pwm0.duty(200) # set duty cycle
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pwm0.deinit() # turn off PWM on the pin
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pwm2 = PWM(Pin(2), freq=20000, duty=512) # create and configure in one go
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ADC (analog to digital conversion)
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----------------------------------
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On the ESP32 ADC functionality is available on Pins 32-39. Note that, when
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using the default configuration, input voltages on the ADC pin must be between
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0.0v and 1.0v (anything above 1.0v will just read as 4095). Attenuation must
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be applied in order to increase this usable voltage range.
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Use the :ref:`machine.ADC <machine.ADC>` class::
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from machine import ADC
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adc = ADC(Pin(32)) # create ADC object on ADC pin
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adc.read() # read value, 0-4095 across voltage range 0.0v - 1.0v
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adc.atten(ADC.ATTN_11DB) # set 11dB input attentuation (voltage range roughly 0.0v - 3.6v)
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adc.width(ADC.WIDTH_9BIT) # set 9 bit return values (returned range 0-511)
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adc.read() # read value using the newly configured attenuation and width
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ESP32 specific ADC class method reference:
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.. method:: ADC.atten(attenuation)
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This method allows for the setting of the amount of attenuation on the
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input of the ADC. This allows for a wider possible input voltage range,
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at the cost of accuracy (the same number of bits now represents a wider
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range). The possible attenuation options are:
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- ``ADC.ATTN_0DB``: 0dB attenuation, gives a maximum input voltage
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of 1.00v - this is the default configuration
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- ``ADC.ATTN_2_5DB``: 2.5dB attenuation, gives a maximum input voltage
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of approximately 1.34v
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- ``ADC.ATTN_6DB``: 6dB attenuation, gives a maximum input voltage
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of approximately 2.00v
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- ``ADC.ATTN_11DB``: 11dB attenuation, gives a maximum input voltage
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of approximately 3.6v
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.. Warning::
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Despite 11dB attenuation allowing for up to a 3.6v range, note that the
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absolute maximum voltage rating for the input pins is 3.6v, and so going
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near this boundary may be damaging to the IC!
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.. method:: ADC.width(width)
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This method allows for the setting of the number of bits to be utilised
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and returned during ADC reads. Possible width options are:
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- ``ADC.WIDTH_9BIT``: 9 bit data
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- ``ADC.WIDTH_10BIT``: 10 bit data
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- ``ADC.WIDTH_11BIT``: 11 bit data
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- ``ADC.WIDTH_12BIT``: 12 bit data - this is the default configuration
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Software SPI bus
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----------------
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There are two SPI drivers. One is implemented in software (bit-banging)
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and works on all pins, and is accessed via the :ref:`machine.SPI <machine.SPI>`
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class::
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from machine import Pin, SPI
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# construct an SPI bus on the given pins
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# polarity is the idle state of SCK
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# phase=0 means sample on the first edge of SCK, phase=1 means the second
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spi = SPI(baudrate=100000, polarity=1, phase=0, sck=Pin(0), mosi=Pin(2), miso=Pin(4))
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spi.init(baudrate=200000) # set the baudrate
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spi.read(10) # read 10 bytes on MISO
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spi.read(10, 0xff) # read 10 bytes while outputing 0xff on MOSI
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buf = bytearray(50) # create a buffer
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spi.readinto(buf) # read into the given buffer (reads 50 bytes in this case)
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spi.readinto(buf, 0xff) # read into the given buffer and output 0xff on MOSI
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spi.write(b'12345') # write 5 bytes on MOSI
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buf = bytearray(4) # create a buffer
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spi.write_readinto(b'1234', buf) # write to MOSI and read from MISO into the buffer
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spi.write_readinto(buf, buf) # write buf to MOSI and read MISO back into buf
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.. Warning::
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Currently *all* of ``sck``, ``mosi`` and ``miso`` *must* be specified when
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initialising Software SPI.
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Hardware SPI bus
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----------------
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There are two hardware SPI channels that allow faster (up to 80Mhz)
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transmission rates, but are only supported on a subset of pins.
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===== =========== ============
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\ HSPI (id=1) VSPI (id=2)
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===== =========== ============
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sck 14 18
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mosi 13 23
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miso 12 19
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===== =========== ============
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Hardware SPI has the same methods as Software SPI above::
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from machine import Pin, SPI
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hspi = SPI(1, 10000000, sck=Pin(14), mosi=Pin(13), miso=Pin(12))
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vspi = SPI(2, baudrate=80000000, polarity=0, phase=0, bits=8, firstbit=0, sck=Pin(18), mosi=Pin(23), miso=Pin(19))
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I2C bus
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-------
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The I2C driver is implemented in software and works on all pins,
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and is accessed via the :ref:`machine.I2C <machine.I2C>` class::
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from machine import Pin, I2C
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# construct an I2C bus
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i2c = I2C(scl=Pin(5), sda=Pin(4), freq=100000)
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i2c.readfrom(0x3a, 4) # read 4 bytes from slave device with address 0x3a
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i2c.writeto(0x3a, '12') # write '12' to slave device with address 0x3a
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buf = bytearray(10) # create a buffer with 10 bytes
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i2c.writeto(0x3a, buf) # write the given buffer to the slave
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Real time clock (RTC)
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---------------------
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See :ref:`machine.RTC <machine.RTC>` ::
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from machine import RTC
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rtc = RTC()
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rtc.datetime((2017, 8, 23, 1, 12, 48, 0, 0)) # set a specific date and time
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rtc.datetime() # get date and time
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Deep-sleep mode
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---------------
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The following code can be used to sleep, wake and check the reset cause::
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import machine
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# check if the device woke from a deep sleep
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if machine.reset_cause() == machine.DEEPSLEEP_RESET:
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print('woke from a deep sleep')
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# put the device to sleep for 10 seconds
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machine.deepsleep(10000)
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Notes:
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* Calling ``deepsleep()`` without an argument will put the device to sleep
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indefinitely
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* A software reset does not change the reset cause
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OneWire driver
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--------------
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The OneWire driver is implemented in software and works on all pins::
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from machine import Pin
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import onewire
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ow = onewire.OneWire(Pin(12)) # create a OneWire bus on GPIO12
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ow.scan() # return a list of devices on the bus
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ow.reset() # reset the bus
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ow.readbyte() # read a byte
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ow.writebyte(0x12) # write a byte on the bus
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ow.write('123') # write bytes on the bus
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ow.select_rom(b'12345678') # select a specific device by its ROM code
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There is a specific driver for DS18S20 and DS18B20 devices::
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import time, ds18x20
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ds = ds18x20.DS18X20(ow)
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roms = ds.scan()
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ds.convert_temp()
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time.sleep_ms(750)
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for rom in roms:
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print(ds.read_temp(rom))
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Be sure to put a 4.7k pull-up resistor on the data line. Note that
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the ``convert_temp()`` method must be called each time you want to
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sample the temperature.
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NeoPixel driver
|
||||
---------------
|
||||
|
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Use the ``neopixel`` module::
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from machine import Pin
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from neopixel import NeoPixel
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pin = Pin(0, Pin.OUT) # set GPIO0 to output to drive NeoPixels
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np = NeoPixel(pin, 8) # create NeoPixel driver on GPIO0 for 8 pixels
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np[0] = (255, 255, 255) # set the first pixel to white
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np.write() # write data to all pixels
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r, g, b = np[0] # get first pixel colour
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|
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For low-level driving of a NeoPixel::
|
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|
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import esp
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esp.neopixel_write(pin, grb_buf, is800khz)
|
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|
||||
.. Warning::
|
||||
By default ``NeoPixel`` is configured to control the more popular *800kHz*
|
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units. It is possible to use alternative timing to control other (typically
|
||||
400kHz) devices by passing ``timing=0`` when constructing the
|
||||
``NeoPixel`` object.
|
||||
|
||||
|
||||
Capacitive Touch
|
||||
----------------
|
||||
|
||||
Use the ``TouchPad`` class in the ``machine`` module::
|
||||
|
||||
from machine import TouchPad, Pin
|
||||
|
||||
t = TouchPad(Pin(14))
|
||||
t.read() # Returns a smaller number when touched
|
||||
|
||||
``TouchPad.read`` returns a value relative to the capacitive variation. Small numbers (typically in
|
||||
the *tens*) are common when a pin is touched, larger numbers (above *one thousand*) when
|
||||
no touch is present. However the values are *relative* and can vary depending on the board
|
||||
and surrounding composition so some calibration may be required.
|
||||
|
||||
There are ten capacitive touch-enabled pins that can be used on the ESP32: 0, 2, 4, 12, 13
|
||||
14, 15, 27, 32, 33. Trying to assign to any other pins will result in a ``ValueError``.
|
||||
|
||||
Note that TouchPads can be used to wake an ESP32 from sleep::
|
||||
|
||||
import machine
|
||||
from machine import TouchPad, Pin
|
||||
import esp32
|
||||
|
||||
t = TouchPad(Pin(14))
|
||||
t.config(500) # configure the threshold at which the pin is considered touched
|
||||
esp32.wake_on_touch(True)
|
||||
machine.sleep() # put the MCU to sleep until a touchpad is touched
|
||||
|
||||
For more details on touchpads refer to `Espressif Touch Sensor
|
||||
<https://docs.espressif.com/projects/esp-idf/en/latest/api-reference/peripherals/touch_pad.html>`_.
|
||||
|
||||
|
||||
DHT driver
|
||||
----------
|
||||
|
||||
The DHT driver is implemented in software and works on all pins::
|
||||
|
||||
import dht
|
||||
import machine
|
||||
|
||||
d = dht.DHT11(machine.Pin(4))
|
||||
d.measure()
|
||||
d.temperature() # eg. 23 (°C)
|
||||
d.humidity() # eg. 41 (% RH)
|
||||
|
||||
d = dht.DHT22(machine.Pin(4))
|
||||
d.measure()
|
||||
d.temperature() # eg. 23.6 (°C)
|
||||
d.humidity() # eg. 41.3 (% RH)
|
||||
|
||||
WebREPL (web browser interactive prompt)
|
||||
----------------------------------------
|
||||
|
||||
WebREPL (REPL over WebSockets, accessible via a web browser) is an
|
||||
experimental feature available in ESP32 port. Download web client
|
||||
from https://github.com/micropython/webrepl (hosted version available
|
||||
at http://micropython.org/webrepl), and configure it by executing::
|
||||
|
||||
import webrepl_setup
|
||||
|
||||
and following on-screen instructions. After reboot, it will be available
|
||||
for connection. If you disabled automatic start-up on boot, you may
|
||||
run configured daemon on demand using::
|
||||
|
||||
import webrepl
|
||||
webrepl.start()
|
||||
|
||||
# or, start with a specific password
|
||||
webrepl.start(password='mypass')
|
||||
|
||||
The WebREPL daemon listens on all active interfaces, which can be STA or
|
||||
AP. This allows you to connect to the ESP32 via a router (the STA
|
||||
interface) or directly when connected to its access point.
|
||||
|
||||
In addition to terminal/command prompt access, WebREPL also has provision
|
||||
for file transfer (both upload and download). The web client has buttons for
|
||||
the corresponding functions, or you can use the command-line client
|
||||
``webrepl_cli.py`` from the repository above.
|
||||
|
||||
See the MicroPython forum for other community-supported alternatives
|
||||
to transfer files to an ESP32 board.
|
||||
|
|
@ -0,0 +1,139 @@
|
|||
.. _esp32_intro:
|
||||
|
||||
Getting started with MicroPython on the ESP32
|
||||
=============================================
|
||||
|
||||
Using MicroPython is a great way to get the most of your ESP32 board. And
|
||||
vice versa, the ESP32 chip is a great platform for using MicroPython. This
|
||||
tutorial will guide you through setting up MicroPython, getting a prompt, using
|
||||
WebREPL, connecting to the network and communicating with the Internet, using
|
||||
the hardware peripherals, and controlling some external components.
|
||||
|
||||
Let's get started!
|
||||
|
||||
Requirements
|
||||
------------
|
||||
|
||||
The first thing you need is a board with an ESP32 chip. The MicroPython
|
||||
software supports the ESP32 chip itself and any board should work. The main
|
||||
characteristic of a board is how the GPIO pins are connected to the outside
|
||||
world, and whether it includes a built-in USB-serial convertor to make the
|
||||
UART available to your PC.
|
||||
|
||||
Names of pins will be given in this tutorial using the chip names (eg GPIO2)
|
||||
and it should be straightforward to find which pin this corresponds to on your
|
||||
particular board.
|
||||
|
||||
Powering the board
|
||||
------------------
|
||||
|
||||
If your board has a USB connector on it then most likely it is powered through
|
||||
this when connected to your PC. Otherwise you will need to power it directly.
|
||||
Please refer to the documentation for your board for further details.
|
||||
|
||||
Getting the firmware
|
||||
--------------------
|
||||
|
||||
The first thing you need to do is download the most recent MicroPython firmware
|
||||
.bin file to load onto your ESP32 device. You can download it from the
|
||||
`MicroPython downloads page <https://micropython.org/download#esp32>`_.
|
||||
From here, you have 3 main choices:
|
||||
|
||||
* Stable firmware builds
|
||||
* Daily firmware builds
|
||||
* Daily firmware builds with SPIRAM support
|
||||
|
||||
If you are just starting with MicroPython, the best bet is to go for the Stable
|
||||
firmware builds. If you are an advanced, experienced MicroPython ESP32 user
|
||||
who would like to follow development closely and help with testing new
|
||||
features, there are daily builds. If your board has SPIRAM support you can
|
||||
use either the standard firmware or the firmware with SPIRAM support, and in
|
||||
the latter case you will have access to more RAM for Python objects.
|
||||
|
||||
Deploying the firmware
|
||||
----------------------
|
||||
|
||||
Once you have the MicroPython firmware you need to load it onto your ESP32 device.
|
||||
There are two main steps to do this: first you need to put your device in
|
||||
bootloader mode, and second you need to copy across the firmware. The exact
|
||||
procedure for these steps is highly dependent on the particular board and you will
|
||||
need to refer to its documentation for details.
|
||||
|
||||
Fortunately, most boards have a USB connector, a USB-serial convertor, and the DTR
|
||||
and RTS pins wired in a special way then deploying the firmware should be easy as
|
||||
all steps can be done automatically. Boards that have such features
|
||||
include the Adafruit Feather HUZZAH32, M5Stack, Wemos LOLIN32, and TinyPICO
|
||||
boards, along with the Espressif DevKitC, PICO-KIT, WROVER-KIT dev-kits.
|
||||
|
||||
For best results it is recommended to first erase the entire flash of your
|
||||
device before putting on new MicroPython firmware.
|
||||
|
||||
Currently we only support esptool.py to copy across the firmware. You can find
|
||||
this tool here: `<https://github.com/espressif/esptool/>`__, or install it
|
||||
using pip::
|
||||
|
||||
pip install esptool
|
||||
|
||||
Versions starting with 1.3 support both Python 2.7 and Python 3.4 (or newer).
|
||||
An older version (at least 1.2.1 is needed) works fine but will require Python
|
||||
2.7.
|
||||
|
||||
Using esptool.py you can erase the flash with the command::
|
||||
|
||||
esptool.py --port /dev/ttyUSB0 erase_flash
|
||||
|
||||
And then deploy the new firmware using::
|
||||
|
||||
esptool.py --chip esp32 --port /dev/ttyUSB0 write_flash -z 0x1000 esp32-20180511-v1.9.4.bin
|
||||
|
||||
Notes:
|
||||
|
||||
* You might need to change the "port" setting to something else relevant for your
|
||||
PC
|
||||
* You may need to reduce the baudrate if you get errors when flashing
|
||||
(eg down to 115200 by adding ``--baud 115200`` into the command)
|
||||
* For some boards with a particular FlashROM configuration you may need to
|
||||
change the flash mode (eg by adding ``-fm dio`` into the command)
|
||||
* The filename of the firmware should match the file that you have
|
||||
|
||||
If the above commands run without error then MicroPython should be installed on
|
||||
your board!
|
||||
|
||||
Serial prompt
|
||||
-------------
|
||||
|
||||
Once you have the firmware on the device you can access the REPL (Python prompt)
|
||||
over UART0 (GPIO1=TX, GPIO3=RX), which might be connected to a USB-serial
|
||||
convertor, depending on your board. The baudrate is 115200.
|
||||
|
||||
From here you can now follow the ESP8266 tutorial, because these two Espressif chips
|
||||
are very similar when it comes to using MicroPython on them. The ESP8266 tutorial
|
||||
is found at :ref:`esp8266_tutorial` (but skip the Introduction section).
|
||||
|
||||
Troubleshooting installation problems
|
||||
-------------------------------------
|
||||
|
||||
If you experience problems during flashing or with running firmware immediately
|
||||
after it, here are troubleshooting recommendations:
|
||||
|
||||
* Be aware of and try to exclude hardware problems. There are 2 common
|
||||
problems: bad power source quality, and worn-out/defective FlashROM.
|
||||
Speaking of power source, not just raw amperage is important, but also low
|
||||
ripple and noise/EMI in general. The most reliable and convenient power
|
||||
source is a USB port.
|
||||
|
||||
* The flashing instructions above use flashing speed of 460800 baud, which is
|
||||
good compromise between speed and stability. However, depending on your
|
||||
module/board, USB-UART convertor, cables, host OS, etc., the above baud
|
||||
rate may be too high and lead to errors. Try a more common 115200 baud
|
||||
rate instead in such cases.
|
||||
|
||||
* To catch incorrect flash content (e.g. from a defective sector on a chip),
|
||||
add ``--verify`` switch to the commands above.
|
||||
|
||||
* If you still experience problems with flashing the firmware please
|
||||
refer to esptool.py project page, https://github.com/espressif/esptool
|
||||
for additional documentation and a bug tracker where you can report problems.
|
||||
|
||||
* If you are able to flash the firmware but the ``--verify`` option returns
|
||||
errors even after multiple retries the you may have a defective FlashROM chip.
|
||||
|
|
@ -9,4 +9,5 @@ MicroPython documentation and references
|
|||
license.rst
|
||||
pyboard/quickref.rst
|
||||
esp8266/quickref.rst
|
||||
esp32/quickref.rst
|
||||
wipy/quickref.rst
|
||||
|
|
|
|||
|
|
@ -1,10 +1,12 @@
|
|||
:mod:`esp` --- functions related to the ESP8266
|
||||
===============================================
|
||||
:mod:`esp` --- functions related to the ESP8266 and ESP32
|
||||
=========================================================
|
||||
|
||||
.. module:: esp
|
||||
:synopsis: functions related to the ESP8266
|
||||
:synopsis: functions related to the ESP8266 and ESP32
|
||||
|
||||
The ``esp`` module contains specific functions related to the ESP8266 module.
|
||||
The ``esp`` module contains specific functions related to both the ESP8266 and
|
||||
ESP32 modules. Some functions are only available on one or the other of these
|
||||
ports.
|
||||
|
||||
|
||||
Functions
|
||||
|
|
@ -12,6 +14,8 @@ Functions
|
|||
|
||||
.. function:: sleep_type([sleep_type])
|
||||
|
||||
**Note**: ESP8266 only
|
||||
|
||||
Get or set the sleep type.
|
||||
|
||||
If the *sleep_type* parameter is provided, sets the sleep type to its
|
||||
|
|
@ -29,6 +33,8 @@ Functions
|
|||
|
||||
.. function:: deepsleep(time=0)
|
||||
|
||||
**Note**: ESP8266 only - use `machine.deepsleep()` on ESP32
|
||||
|
||||
Enter deep sleep.
|
||||
|
||||
The whole module powers down, except for the RTC clock circuit, which can
|
||||
|
|
@ -38,8 +44,18 @@ Functions
|
|||
|
||||
.. function:: flash_id()
|
||||
|
||||
**Note**: ESP8266 only
|
||||
|
||||
Read the device ID of the flash memory.
|
||||
|
||||
.. function:: flash_size()
|
||||
|
||||
Read the total size of the flash memory.
|
||||
|
||||
.. function:: flash_user_start()
|
||||
|
||||
Read the memory offset at which the user flash space begins.
|
||||
|
||||
.. function:: flash_read(byte_offset, length_or_buffer)
|
||||
|
||||
.. function:: flash_write(byte_offset, bytes)
|
||||
|
|
@ -48,6 +64,8 @@ Functions
|
|||
|
||||
.. function:: set_native_code_location(start, length)
|
||||
|
||||
**Note**: ESP8266 only
|
||||
|
||||
Set the location that native code will be placed for execution after it is
|
||||
compiled. Native code is emitted when the ``@micropython.native``,
|
||||
``@micropython.viper`` and ``@micropython.asm_xtensa`` decorators are applied
|
||||
|
|
|
|||
|
|
@ -139,10 +139,10 @@ The following libraries and classes are specific to the WiPy.
|
|||
machine.TimerWiPy.rst
|
||||
|
||||
|
||||
Libraries specific to the ESP8266
|
||||
---------------------------------
|
||||
Libraries specific to the ESP8266 and ESP32
|
||||
-------------------------------------------
|
||||
|
||||
The following libraries are specific to the ESP8266.
|
||||
The following libraries are specific to the ESP8266 and ESP32.
|
||||
|
||||
.. toctree::
|
||||
:maxdepth: 2
|
||||
|
|
|
|||
|
|
@ -53,6 +53,10 @@
|
|||
<a class="biglink" href="{{ pathto("esp8266/quickref") }}">Quick reference for the ESP8266</a><br/>
|
||||
<span class="linkdescr">pinout for ESP8266-based boards, snippets of useful code, and a tutorial</span>
|
||||
</p>
|
||||
<p class="biglink">
|
||||
<a class="biglink" href="{{ pathto("esp32/quickref") }}">Quick reference for the ESP32</a><br/>
|
||||
<span class="linkdescr">pinout for ESP32-based boards, snippets of useful code, and a tutorial</span>
|
||||
</p>
|
||||
<p class="biglink">
|
||||
<a class="biglink" href="{{ pathto("wipy/quickref") }}">Quick reference for the WiPy/CC3200</a><br/>
|
||||
<span class="linkdescr">pinout for the WiPy/CC3200, snippets of useful code, and a tutorial</span>
|
||||
|
|
|
|||
Ładowanie…
Reference in New Issue