remove docs added in merge
This commit is contained in:
Jeff Epler
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.. _ssd1306:
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Using a SSD1306 OLED display
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============================
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The SSD1306 OLED display uses either a SPI or I2C interface and comes in a variety of
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sizes (128x64, 128x32, 72x40, 64x48) and colours (white, yellow, blue, yellow + blue).
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Hardware SPI interface::
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from machine import Pin, SPI
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import ssd1306
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hspi = SPI(1) # sck=14 (scl), mosi=13 (sda), miso=12 (unused)
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dc = Pin(4) # data/command
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rst = Pin(5) # reset
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cs = Pin(15) # chip select, some modules do not have a pin for this
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display = ssd1306.SSD1306_SPI(128, 64, hspi, dc, rst, cs)
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Software SPI interface::
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from machine import Pin, SoftSPI
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import ssd1306
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spi = SoftSPI(baudrate=500000, polarity=1, phase=0, sck=Pin(14), mosi=Pin(13), miso=Pin(12))
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dc = Pin(4) # data/command
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rst = Pin(5) # reset
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cs = Pin(15) # chip select, some modules do not have a pin for this
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display = ssd1306.SSD1306_SPI(128, 64, spi, dc, rst, cs)
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I2C interface::
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from machine import Pin, I2C
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import ssd1306
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# using default address 0x3C
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i2c = I2C(sda=Pin(4), scl=Pin(5))
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display = ssd1306.SSD1306_I2C(128, 64, i2c)
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Print Hello World on the first line::
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display.text('Hello, World!', 0, 0, 1)
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display.show()
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Basic functions::
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display.poweroff() # power off the display, pixels persist in memory
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display.poweron() # power on the display, pixels redrawn
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display.contrast(0) # dim
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display.contrast(255) # bright
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display.invert(1) # display inverted
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display.invert(0) # display normal
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display.rotate(True) # rotate 180 degrees
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display.rotate(False) # rotate 0 degrees
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display.show() # write the contents of the FrameBuffer to display memory
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Subclassing FrameBuffer provides support for graphics primitives::
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display.fill(0) # fill entire screen with colour=0
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display.pixel(0, 10) # get pixel at x=0, y=10
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display.pixel(0, 10, 1) # set pixel at x=0, y=10 to colour=1
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display.hline(0, 8, 4, 1) # draw horizontal line x=0, y=8, width=4, colour=1
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display.vline(0, 8, 4, 1) # draw vertical line x=0, y=8, height=4, colour=1
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display.line(0, 0, 127, 63, 1) # draw a line from 0,0 to 127,63
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display.rect(10, 10, 107, 43, 1) # draw a rectangle outline 10,10 to 107,43, colour=1
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display.fill_rect(10, 10, 107, 43, 1) # draw a solid rectangle 10,10 to 107,43, colour=1
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display.text('Hello World', 0, 0, 1) # draw some text at x=0, y=0, colour=1
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display.scroll(20, 0) # scroll 20 pixels to the right
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# draw another FrameBuffer on top of the current one at the given coordinates
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import framebuf
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fbuf = framebuf.FrameBuffer(bytearray(8 * 8 * 1), 8, 8, framebuf.MONO_VLSB)
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fbuf.line(0, 0, 7, 7, 1)
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display.blit(fbuf, 10, 10, 0) # draw on top at x=10, y=10, key=0
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display.show()
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Draw the MicroPython logo and print some text::
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display.fill(0)
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display.fill_rect(0, 0, 32, 32, 1)
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display.fill_rect(2, 2, 28, 28, 0)
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display.vline(9, 8, 22, 1)
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display.vline(16, 2, 22, 1)
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display.vline(23, 8, 22, 1)
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display.fill_rect(26, 24, 2, 4, 1)
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display.text('MicroPython', 40, 0, 1)
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display.text('SSD1306', 40, 12, 1)
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display.text('OLED 128x64', 40, 24, 1)
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display.show()
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.. currentmodule:: machine
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.. _machine.PWM:
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class PWM -- pulse width modulation
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===================================
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This class provides pulse width modulation output.
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Example usage::
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from machine import PWM
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pwm = PWM(pin) # create a PWM object on a pin
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pwm.duty_u16(32768) # set duty to 50%
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# reinitialise with a period of 200us, duty of 5us
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pwm.init(freq=5000, duty_ns=5000)
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pwm.duty_ns(3000) # set pulse width to 3us
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pwm.deinit()
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Constructors
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------------
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.. class:: PWM(dest, \*, freq, duty_u16, duty_ns)
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Construct and return a new PWM object using the following parameters:
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- *dest* is the entity on which the PWM is output, which is usually a
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:ref:`machine.Pin <machine.Pin>` object, but a port may allow other values,
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like integers.
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- *freq* should be an integer which sets the frequency in Hz for the
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PWM cycle.
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- *duty_u16* sets the duty cycle as a ratio ``duty_u16 / 65535``.
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- *duty_ns* sets the pulse width in nanoseconds.
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Setting *freq* may affect other PWM objects if the objects share the same
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underlying PWM generator (this is hardware specific).
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Only one of *duty_u16* and *duty_ns* should be specified at a time.
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Methods
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-------
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.. method:: PWM.init(\*, freq, duty_u16, duty_ns)
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Modify settings for the PWM object. See the above constructor for details
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about the parameters.
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.. method:: PWM.deinit()
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Disable the PWM output.
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.. method:: PWM.freq([value])
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Get or set the current frequency of the PWM output.
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With no arguments the frequency in Hz is returned.
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With a single *value* argument the frequency is set to that value in Hz. The
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method may raise a ``ValueError`` if the frequency is outside the valid range.
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.. method:: PWM.duty_u16([value])
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Get or set the current duty cycle of the PWM output, as an unsigned 16-bit
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value in the range 0 to 65535 inclusive.
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With no arguments the duty cycle is returned.
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With a single *value* argument the duty cycle is set to that value, measured
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as the ratio ``value / 65535``.
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.. method:: PWM.duty_ns([value])
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Get or set the current pulse width of the PWM output, as a value in nanoseconds.
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With no arguments the pulse width in nanoseconds is returned.
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With a single *value* argument the pulse width is set to that value.
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.. currentmodule:: rp2
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.. _rp2.Flash:
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class Flash -- access to built-in flash storage
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===============================================
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This class gives access to the SPI flash memory.
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In most cases, to store persistent data on the device, you'll want to use a
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higher-level abstraction, for example the filesystem via Python's standard file
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API, but this interface is useful to :ref:`customise the filesystem
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configuration <filesystem>` or implement a low-level storage system for your
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application.
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Constructors
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------------
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.. class:: Flash()
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Gets the singleton object for accessing the SPI flash memory.
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Methods
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-------
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.. method:: Flash.readblocks(block_num, buf)
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Flash.readblocks(block_num, buf, offset)
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.. method:: Flash.writeblocks(block_num, buf)
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Flash.writeblocks(block_num, buf, offset)
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.. method:: Flash.ioctl(cmd, arg)
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These methods implement the simple and extended
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:ref:`block protocol <block-device-interface>` defined by
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:class:`uos.AbstractBlockDev`.
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.. currentmodule:: rp2
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.. _rp2.PIO:
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class PIO -- advanced PIO usage
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===============================
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The :class:`PIO` class gives access to an instance of the RP2040's PIO
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(programmable I/O) interface.
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The preferred way to interact with PIO is using :class:`rp2.StateMachine`, the
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PIO class is for advanced use.
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For assembling PIO programs, see :func:`rp2.asm_pio`.
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Constructors
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------------
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.. class:: PIO(id)
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Gets the PIO instance numbered *id*. The RP2040 has two PIO instances,
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numbered 0 and 1.
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Raises a ``ValueError`` if any other argument is provided.
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Methods
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-------
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.. method:: PIO.add_program(program)
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Add the *program* to the instruction memory of this PIO instance.
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The amount of memory available for programs on each PIO instance is
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limited. If there isn't enough space left in the PIO's program memory
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this method will raise ``OSError(ENOMEM)``.
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.. method:: PIO.remove_program([program])
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Remove *program* from the instruction memory of this PIO instance.
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If no program is provided, it removes all programs.
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It is not an error to remove a program which has already been removed.
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.. method:: PIO.state_machine(id, [program, ...])
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Gets the state machine numbered *id*. On the RP2040, each PIO instance has
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four state machines, numbered 0 to 3.
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Optionally initialize it with a *program*: see `StateMachine.init`.
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>>> rp2.PIO(1).state_machine(3)
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StateMachine(7)
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.. method:: PIO.irq(handler=None, trigger=IRQ_SM0|IRQ_SM1|IRQ_SM2|IRQ_SM3, hard=False)
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Returns the IRQ object for this PIO instance.
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MicroPython only uses IRQ 0 on each PIO instance. IRQ 1 is not available.
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Optionally configure it.
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Constants
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---------
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.. data:: PIO.IN_LOW
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PIO.IN_HIGH
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PIO.OUT_LOW
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PIO.OUT_HIGH
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These constants are used for the *out_init*, *set_init*, and *sideset_init*
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arguments to `asm_pio`.
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.. data:: PIO.SHIFT_LEFT
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PIO.SHIFT_RIGHT
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These constants are used for the *in_shiftdir* and *out_shiftdir* arguments
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to `asm_pio` or `StateMachine.init`.
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.. data:: PIO.JOIN_NONE
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PIO.JOIN_TX
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PIO.JOIN_RX
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These constants are used for the *fifo_join* argument to `asm_pio`.
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.. data:: PIO.IRQ_SM0
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PIO.IRQ_SM1
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PIO.IRQ_SM2
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PIO.IRQ_SM3
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These constants are used for the *trigger* argument to `PIO.irq`.
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.. currentmodule:: rp2
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.. _rp2.StateMachine:
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class StateMachine -- access to the RP2040's programmable I/O interface
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=======================================================================
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The :class:`StateMachine` class gives access to the RP2040's PIO (programmable
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I/O) interface.
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For assembling PIO programs, see :func:`rp2.asm_pio`.
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Constructors
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------------
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.. class:: StateMachine(id, [program, ...])
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Get the state machine numbered *id*. The RP2040 has two identical PIO
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instances, each with 4 state machines: so there are 8 state machines in
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total, numbered 0 to 7.
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Optionally initialize it with the given program *program*: see
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`StateMachine.init`.
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Methods
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-------
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.. method:: StateMachine.init(program, freq=-1, *, in_base=None, out_base=None, set_base=None, jmp_pin=None, sideset_base=None, in_shiftdir=None, out_shiftdir=None, push_thresh=None, pull_thresh=None)
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Configure the state machine instance to run the given *program*.
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The program is added to the instruction memory of this PIO instance. If the
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instruction memory already contains this program, then its offset is
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re-used so as to save on instruction memory.
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- *freq* is the frequency in Hz to run the state machine at. Defaults to
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the system clock frequency.
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The clock divider is computed as ``system clock frequency / freq``, so
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there can be slight rounding errors.
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The minimum possible clock divider is one 65536th of the system clock: so
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at the default system clock frequency of 125MHz, the minimum value of
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*freq* is ``1908``. To run state machines at slower frequencies, you'll
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need to reduce the system clock speed with `machine.freq()`.
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- *in_base* is the first pin to use for ``in()`` instructions.
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- *out_base* is the first pin to use for ``out()`` instructions.
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- *set_base* is the first pin to use for ``set()`` instructions.
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- *jmp_pin* is the first pin to use for ``jmp(pin, ...)`` instructions.
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- *sideset_base* is the first pin to use for side-setting.
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- *in_shiftdir* is the direction the ISR will shift, either
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`PIO.SHIFT_LEFT` or `PIO.SHIFT_RIGHT`.
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- *out_shiftdir* is the direction the OSR will shift, either
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`PIO.SHIFT_LEFT` or `PIO.SHIFT_RIGHT`.
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- *push_thresh* is the threshold in bits before auto-push or conditional
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re-pushing is triggered.
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- *pull_thresh* is the threshold in bits before auto-push or conditional
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re-pushing is triggered.
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.. method:: StateMachine.active([value])
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Gets or sets whether the state machine is currently running.
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>>> sm.active()
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True
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>>> sm.active(0)
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False
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.. method:: StateMachine.restart()
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Restarts the state machine and jumps to the beginning of the program.
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This method clears the state machine's internal state using the RP2040's
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``SM_RESTART`` register. This includes:
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- input and output shift counters
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- the contents of the input shift register
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- the delay counter
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- the waiting-on-IRQ state
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- a stalled instruction run using `StateMachine.exec()`
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.. method:: StateMachine.exec(instr)
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Execute a single PIO instruction. Uses `asm_pio_encode` to encode the
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instruction from the given string *instr*.
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>>> sm.exec("set(0, 1)")
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.. method:: StateMachine.get(buf=None, shift=0)
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Pull a word from the state machine's RX FIFO.
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If the FIFO is empty, it blocks until data arrives (i.e. the state machine
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pushes a word).
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The value is shifted right by *shift* bits before returning, i.e. the
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return value is ``word >> shift``.
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.. method:: StateMachine.put(value, shift=0)
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Push a word onto the state machine's TX FIFO.
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If the FIFO is full, it blocks until there is space (i.e. the state machine
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pulls a word).
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The value is first shifted left by *shift* bits, i.e. the state machine
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receives ``value << shift``.
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.. method:: StateMachine.rx_fifo()
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Returns the number of words in the state machine's RX FIFO. A value of 0
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indicates the FIFO is empty.
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Useful for checking if data is waiting to be read, before calling
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`StateMachine.get()`.
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.. method:: StateMachine.tx_fifo()
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Returns the number of words in the state machine's TX FIFO. A value of 0
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indicates the FIFO is empty.
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Useful for checking if there is space to push another word using
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`StateMachine.put()`.
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.. method:: StateMachine.irq(handler=None, trigger=0|1, hard=False)
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Returns the IRQ object for the given StateMachine.
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Optionally configure it.
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@ -1,83 +0,0 @@
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.. currentmodule:: rp2
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:mod:`rp2` --- functionality specific to the RP2040
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===================================================
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.. module:: rp2
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:synopsis: functionality specific to the RP2
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The ``rp2`` module contains functions and classes specific to the RP2040, as
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used in the Raspberry Pi Pico.
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See the `RP2040 Python datasheet
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<https://datasheets.raspberrypi.org/pico/raspberry-pi-pico-python-sdk.pdf>`_
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for more information, and `pico-micropython-examples
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<https://github.com/raspberrypi/pico-micropython-examples/tree/master/pio>`_
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for example code.
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PIO related functions
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---------------------
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The ``rp2`` module includes functions for assembling PIO programs.
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For running PIO programs, see :class:`rp2.StateMachine`.
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.. function:: asm_pio(*, out_init=None, set_init=None, sideset_init=None, in_shiftdir=0, out_shiftdir=0, autopush=False, autopull=False, push_thresh=32, pull_thresh=32, fifo_join=PIO.JOIN_NONE)
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Assemble a PIO program.
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The following parameters control the initial state of the GPIO pins, as one
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of `PIO.IN_LOW`, `PIO.IN_HIGH`, `PIO.OUT_LOW` or `PIO.OUT_HIGH`. If the
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program uses more than one pin, provide a tuple, e.g.
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``out_init=(PIO.OUT_LOW, PIO.OUT_LOW)``.
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- *out_init* configures the pins used for ``out()`` instructions.
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- *set_init* configures the pins used for ``set()`` instructions. There can
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be at most 5.
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- *sideset_init* configures the pins used side-setting. There can be at
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most 5.
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The following parameters are used by default, but can be overridden in
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`StateMachine.init()`:
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- *in_shiftdir* is the default direction the ISR will shift, either
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`PIO.SHIFT_LEFT` or `PIO.SHIFT_RIGHT`.
|
||||
- *out_shiftdir* is the default direction the OSR will shift, either
|
||||
`PIO.SHIFT_LEFT` or `PIO.SHIFT_RIGHT`.
|
||||
- *push_thresh* is the threshold in bits before auto-push or conditional
|
||||
re-pushing is triggered.
|
||||
- *pull_thresh* is the threshold in bits before auto-push or conditional
|
||||
re-pushing is triggered.
|
||||
|
||||
The remaining parameters are:
|
||||
|
||||
- *autopush* configures whether auto-push is enabled.
|
||||
- *autopull* configures whether auto-pull is enabled.
|
||||
- *fifo_join* configures whether the 4-word TX and RX FIFOs should be
|
||||
combined into a single 8-word FIFO for one direction only. The options
|
||||
are `PIO.JOIN_NONE`, `PIO.JOIN_RX` and `PIO.JOIN_TX`.
|
||||
|
||||
.. function:: asm_pio_encode(instr, sideset_count)
|
||||
|
||||
Assemble a single PIO instruction. You usually want to use `asm_pio()`
|
||||
instead.
|
||||
|
||||
>>> rp2.asm_pio_encode("set(0, 1)", 0)
|
||||
57345
|
||||
|
||||
.. class:: PIOASMError
|
||||
|
||||
This exception is raised from `asm_pio()` or `asm_pio_encode()` if there is
|
||||
an error assembling a PIO program.
|
||||
|
||||
|
||||
Classes
|
||||
-------
|
||||
|
||||
.. toctree::
|
||||
:maxdepth: 1
|
||||
|
||||
rp2.Flash.rst
|
||||
rp2.PIO.rst
|
||||
rp2.StateMachine.rst
|
||||
|
|
@ -1,18 +0,0 @@
|
|||
.. _rp2_general:
|
||||
|
||||
General information about the RP2xxx port
|
||||
=========================================
|
||||
|
||||
The rp2 port supports boards powered by the Raspberry Pi Foundation's RP2xxx
|
||||
family of microcontrollers, most notably the Raspberry Pi Pico that employs
|
||||
the RP2040.
|
||||
|
||||
Technical specifications and SoC datasheets
|
||||
-------------------------------------------
|
||||
|
||||
Datasheets!
|
||||
|
||||
Short summary of tech specs!
|
||||
|
||||
Description of general structure of the port (it's built on top of the APIs
|
||||
provided by the Raspberry Pi SDK).
|
||||
Binary file not shown.
|
Before Width: | Height: | Size: 87 KiB |
|
|
@ -1,288 +0,0 @@
|
|||
.. _rp2_quickref:
|
||||
|
||||
Quick reference for the RP2
|
||||
===========================
|
||||
|
||||
.. image:: img/rpipico.jpg
|
||||
:alt: Raspberry Pi Pico
|
||||
:width: 640px
|
||||
|
||||
The Raspberry Pi Pico Development Board (image attribution: Raspberry Pi Foundation).
|
||||
|
||||
Below is a quick reference for Raspberry Pi RP2xxx boards. If it is your first time
|
||||
working with this board it may be useful to get an overview of the microcontroller:
|
||||
|
||||
.. toctree::
|
||||
:maxdepth: 1
|
||||
|
||||
general.rst
|
||||
tutorial/intro.rst
|
||||
|
||||
Installing MicroPython
|
||||
----------------------
|
||||
|
||||
See the corresponding section of tutorial: :ref:`rp2_intro`. It also includes
|
||||
a troubleshooting subsection.
|
||||
|
||||
General board control
|
||||
---------------------
|
||||
|
||||
The MicroPython REPL is on the USB serial port.
|
||||
Tab-completion is useful to find out what methods an object has.
|
||||
Paste mode (ctrl-E) is useful to paste a large slab of Python code into
|
||||
the REPL.
|
||||
|
||||
The :mod:`machine` module::
|
||||
|
||||
import machine
|
||||
|
||||
machine.freq() # get the current frequency of the CPU
|
||||
machine.freq(240000000) # set the CPU frequency to 240 MHz
|
||||
|
||||
The :mod:`rp2` module::
|
||||
|
||||
import rp2
|
||||
|
||||
Delay and timing
|
||||
----------------
|
||||
|
||||
Use the :mod:`time <utime>` module::
|
||||
|
||||
import time
|
||||
|
||||
time.sleep(1) # sleep for 1 second
|
||||
time.sleep_ms(500) # sleep for 500 milliseconds
|
||||
time.sleep_us(10) # sleep for 10 microseconds
|
||||
start = time.ticks_ms() # get millisecond counter
|
||||
delta = time.ticks_diff(time.ticks_ms(), start) # compute time difference
|
||||
|
||||
Timers
|
||||
------
|
||||
|
||||
How do they work?
|
||||
|
||||
.. _rp2_Pins_and_GPIO:
|
||||
|
||||
Pins and GPIO
|
||||
-------------
|
||||
|
||||
Use the :ref:`machine.Pin <machine.Pin>` class::
|
||||
|
||||
from machine import Pin
|
||||
|
||||
p0 = Pin(0, Pin.OUT) # create output pin on GPIO0
|
||||
p0.on() # set pin to "on" (high) level
|
||||
p0.off() # set pin to "off" (low) level
|
||||
p0.value(1) # set pin to on/high
|
||||
|
||||
p2 = Pin(2, Pin.IN) # create input pin on GPIO2
|
||||
print(p2.value()) # get value, 0 or 1
|
||||
|
||||
p4 = Pin(4, Pin.IN, Pin.PULL_UP) # enable internal pull-up resistor
|
||||
p5 = Pin(5, Pin.OUT, value=1) # set pin high on creation
|
||||
|
||||
UART (serial bus)
|
||||
-----------------
|
||||
|
||||
See :ref:`machine.UART <machine.UART>`. ::
|
||||
|
||||
from machine import UART
|
||||
|
||||
uart1 = UART(1, baudrate=9600, tx=33, rx=32)
|
||||
uart1.write('hello') # write 5 bytes
|
||||
uart1.read(5) # read up to 5 bytes
|
||||
|
||||
|
||||
PWM (pulse width modulation)
|
||||
----------------------------
|
||||
|
||||
How does PWM work on the RPi RP2xxx?
|
||||
|
||||
Use the ``machine.PWM`` class::
|
||||
|
||||
from machine import Pin, PWM
|
||||
|
||||
pwm0 = PWM(Pin(0)) # create PWM object from a pin
|
||||
pwm0.freq() # get current frequency
|
||||
pwm0.freq(1000) # set frequency
|
||||
pwm0.duty_u16() # get current duty cycle, range 0-65535
|
||||
pwm0.duty_u16(200) # set duty cycle, range 0-65535
|
||||
pwm0.deinit() # turn off PWM on the pin
|
||||
|
||||
ADC (analog to digital conversion)
|
||||
----------------------------------
|
||||
|
||||
How does the ADC module work?
|
||||
|
||||
Use the :ref:`machine.ADC <machine.ADC>` class::
|
||||
|
||||
from machine import ADC
|
||||
|
||||
adc = ADC(Pin(32)) # create ADC object on ADC pin
|
||||
adc.read_u16() # read value, 0-65535 across voltage range 0.0v - 3.3v
|
||||
|
||||
Software SPI bus
|
||||
----------------
|
||||
|
||||
Software SPI (using bit-banging) works on all pins, and is accessed via the
|
||||
:ref:`machine.SoftSPI <machine.SoftSPI>` class::
|
||||
|
||||
from machine import Pin, SoftSPI
|
||||
|
||||
# construct a SoftSPI bus on the given pins
|
||||
# polarity is the idle state of SCK
|
||||
# phase=0 means sample on the first edge of SCK, phase=1 means the second
|
||||
spi = SoftSPI(baudrate=100000, polarity=1, phase=0, sck=Pin(0), mosi=Pin(2), miso=Pin(4))
|
||||
|
||||
spi.init(baudrate=200000) # set the baudrate
|
||||
|
||||
spi.read(10) # read 10 bytes on MISO
|
||||
spi.read(10, 0xff) # read 10 bytes while outputting 0xff on MOSI
|
||||
|
||||
buf = bytearray(50) # create a buffer
|
||||
spi.readinto(buf) # read into the given buffer (reads 50 bytes in this case)
|
||||
spi.readinto(buf, 0xff) # read into the given buffer and output 0xff on MOSI
|
||||
|
||||
spi.write(b'12345') # write 5 bytes on MOSI
|
||||
|
||||
buf = bytearray(4) # create a buffer
|
||||
spi.write_readinto(b'1234', buf) # write to MOSI and read from MISO into the buffer
|
||||
spi.write_readinto(buf, buf) # write buf to MOSI and read MISO back into buf
|
||||
|
||||
.. Warning::
|
||||
Currently *all* of ``sck``, ``mosi`` and ``miso`` *must* be specified when
|
||||
initialising Software SPI.
|
||||
|
||||
Hardware SPI bus
|
||||
----------------
|
||||
|
||||
Hardware SPI is accessed via the :ref:`machine.SPI <machine.SPI>` class and
|
||||
has the same methods as software SPI above::
|
||||
|
||||
from machine import Pin, SPI
|
||||
|
||||
spi = SPI(1, 10000000)
|
||||
spi = SPI(1, 10000000, sck=Pin(14), mosi=Pin(13), miso=Pin(12))
|
||||
spi = SPI(2, baudrate=80000000, polarity=0, phase=0, bits=8, firstbit=0, sck=Pin(18), mosi=Pin(23), miso=Pin(19))
|
||||
|
||||
Software I2C bus
|
||||
----------------
|
||||
|
||||
Software I2C (using bit-banging) works on all output-capable pins, and is
|
||||
accessed via the :ref:`machine.SoftI2C <machine.SoftI2C>` class::
|
||||
|
||||
from machine import Pin, SoftI2C
|
||||
|
||||
i2c = SoftI2C(scl=Pin(5), sda=Pin(4), freq=100000)
|
||||
|
||||
i2c.scan() # scan for devices
|
||||
|
||||
i2c.readfrom(0x3a, 4) # read 4 bytes from device with address 0x3a
|
||||
i2c.writeto(0x3a, '12') # write '12' to device with address 0x3a
|
||||
|
||||
buf = bytearray(10) # create a buffer with 10 bytes
|
||||
i2c.writeto(0x3a, buf) # write the given buffer to the slave
|
||||
|
||||
Hardware I2C bus
|
||||
----------------
|
||||
|
||||
The driver is accessed via the :ref:`machine.I2C <machine.I2C>` class and
|
||||
has the same methods as software I2C above::
|
||||
|
||||
from machine import Pin, I2C
|
||||
|
||||
i2c = I2C(0)
|
||||
i2c = I2C(1, scl=Pin(5), sda=Pin(4), freq=400000)
|
||||
|
||||
Real time clock (RTC)
|
||||
---------------------
|
||||
|
||||
See :ref:`machine.RTC <machine.RTC>` ::
|
||||
|
||||
from machine import RTC
|
||||
|
||||
rtc = RTC()
|
||||
rtc.datetime((2017, 8, 23, 1, 12, 48, 0, 0)) # set a specific date and time
|
||||
rtc.datetime() # get date and time
|
||||
|
||||
WDT (Watchdog timer)
|
||||
--------------------
|
||||
|
||||
Is there a watchdog timer?
|
||||
|
||||
See :ref:`machine.WDT <machine.WDT>`. ::
|
||||
|
||||
from machine import WDT
|
||||
|
||||
# enable the WDT with a timeout of 5s (1s is the minimum)
|
||||
wdt = WDT(timeout=5000)
|
||||
wdt.feed()
|
||||
|
||||
Deep-sleep mode
|
||||
---------------
|
||||
|
||||
Is there deep-sleep support for the rp2?
|
||||
|
||||
The following code can be used to sleep, wake and check the reset cause::
|
||||
|
||||
import machine
|
||||
|
||||
# check if the device woke from a deep sleep
|
||||
if machine.reset_cause() == machine.DEEPSLEEP_RESET:
|
||||
print('woke from a deep sleep')
|
||||
|
||||
# put the device to sleep for 10 seconds
|
||||
machine.deepsleep(10000)
|
||||
|
||||
OneWire driver
|
||||
--------------
|
||||
|
||||
The OneWire driver is implemented in software and works on all pins::
|
||||
|
||||
from machine import Pin
|
||||
import onewire
|
||||
|
||||
ow = onewire.OneWire(Pin(12)) # create a OneWire bus on GPIO12
|
||||
ow.scan() # return a list of devices on the bus
|
||||
ow.reset() # reset the bus
|
||||
ow.readbyte() # read a byte
|
||||
ow.writebyte(0x12) # write a byte on the bus
|
||||
ow.write('123') # write bytes on the bus
|
||||
ow.select_rom(b'12345678') # select a specific device by its ROM code
|
||||
|
||||
There is a specific driver for DS18S20 and DS18B20 devices::
|
||||
|
||||
import time, ds18x20
|
||||
ds = ds18x20.DS18X20(ow)
|
||||
roms = ds.scan()
|
||||
ds.convert_temp()
|
||||
time.sleep_ms(750)
|
||||
for rom in roms:
|
||||
print(ds.read_temp(rom))
|
||||
|
||||
Be sure to put a 4.7k pull-up resistor on the data line. Note that
|
||||
the ``convert_temp()`` method must be called each time you want to
|
||||
sample the temperature.
|
||||
|
||||
NeoPixel and APA106 driver
|
||||
--------------------------
|
||||
|
||||
Use the ``neopixel`` and ``apa106`` modules::
|
||||
|
||||
from machine import Pin
|
||||
from neopixel import NeoPixel
|
||||
|
||||
pin = Pin(0, Pin.OUT) # set GPIO0 to output to drive NeoPixels
|
||||
np = NeoPixel(pin, 8) # create NeoPixel driver on GPIO0 for 8 pixels
|
||||
np[0] = (255, 255, 255) # set the first pixel to white
|
||||
np.write() # write data to all pixels
|
||||
r, g, b = np[0] # get first pixel colour
|
||||
|
||||
|
||||
The APA106 driver extends NeoPixel, but internally uses a different colour order::
|
||||
|
||||
from apa106 import APA106
|
||||
ap = APA106(pin, 8)
|
||||
r, g, b = ap[0]
|
||||
|
||||
APA102 (DotStar) uses a different driver as it has an additional clock pin.
|
||||
|
|
@ -1,6 +0,0 @@
|
|||
.. _rp2_intro:
|
||||
|
||||
Getting started with MicroPython on the RP2xxx
|
||||
==============================================
|
||||
|
||||
Let's get started!
|
||||
Loading…
Reference in New Issue