kopia lustrzana https://github.com/micropython/micropython
263 wiersze
6.8 KiB
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263 wiersze
6.8 KiB
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.. _pyboard_quickref:
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Quick reference for the pyboard
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===============================
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The below pinout is for PYBv1.1. You can also view pinouts for
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other versions of the pyboard:
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`PYBv1.0 <http://micropython.org/resources/pybv10-pinout.jpg>`__
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or `PYBLITEv1.0-AC <http://micropython.org/resources/pyblitev10ac-pinout.jpg>`__
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or `PYBLITEv1.0 <http://micropython.org/resources/pyblitev10-pinout.jpg>`__.
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.. only:: not latex
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.. image:: http://micropython.org/resources/pybv11-pinout.jpg
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:alt: PYBv1.1 pinout
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:width: 700px
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.. only:: latex
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.. image:: http://micropython.org/resources/pybv11-pinout-800px.jpg
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:alt: PYBv1.1 pinout
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Below is a quick reference for the pyboard. If it is your first time working with
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this board please consider reading the following sections first:
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.. toctree::
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:maxdepth: 1
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general.rst
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tutorial/index.rst
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General board control
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---------------------
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See :mod:`pyb`. ::
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import pyb
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pyb.repl_uart(pyb.UART(1, 9600)) # duplicate REPL on UART(1)
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pyb.wfi() # pause CPU, waiting for interrupt
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pyb.freq() # get CPU and bus frequencies
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pyb.freq(60000000) # set CPU freq to 60MHz
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pyb.stop() # stop CPU, waiting for external interrupt
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Delay and timing
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----------------
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Use the :mod:`time <time>` 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 value of millisecond counter
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delta = time.ticks_diff(time.ticks_ms(), start) # compute time difference
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Internal LEDs
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-------------
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See :ref:`pyb.LED <pyb.LED>`. ::
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from pyb import LED
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led = LED(1) # 1=red, 2=green, 3=yellow, 4=blue
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led.toggle()
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led.on()
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led.off()
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# LEDs 3 and 4 support PWM intensity (0-255)
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LED(4).intensity() # get intensity
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LED(4).intensity(128) # set intensity to half
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Internal switch
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---------------
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See :ref:`pyb.Switch <pyb.Switch>`. ::
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from pyb import Switch
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sw = Switch()
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sw.value() # returns True or False
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sw.callback(lambda: pyb.LED(1).toggle())
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Pins and GPIO
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-------------
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See :ref:`pyb.Pin <pyb.Pin>`. ::
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from pyb import Pin
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p_out = Pin('X1', Pin.OUT_PP)
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p_out.high()
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p_out.low()
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p_in = Pin('X2', Pin.IN, Pin.PULL_UP)
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p_in.value() # get value, 0 or 1
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Servo control
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-------------
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See :ref:`pyb.Servo <pyb.Servo>`. ::
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from pyb import Servo
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s1 = Servo(1) # servo on position 1 (X1, VIN, GND)
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s1.angle(45) # move to 45 degrees
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s1.angle(-60, 1500) # move to -60 degrees in 1500ms
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s1.speed(50) # for continuous rotation servos
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External interrupts
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-------------------
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See :ref:`pyb.ExtInt <pyb.ExtInt>`. ::
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from pyb import Pin, ExtInt
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callback = lambda e: print("intr")
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ext = ExtInt(Pin('Y1'), ExtInt.IRQ_RISING, Pin.PULL_NONE, callback)
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Timers
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------
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See :ref:`pyb.Timer <pyb.Timer>`. ::
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from pyb import Timer
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tim = Timer(1, freq=1000)
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tim.counter() # get counter value
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tim.freq(0.5) # 0.5 Hz
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tim.callback(lambda t: pyb.LED(1).toggle())
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RTC (real time clock)
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---------------------
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See :ref:`pyb.RTC <pyb.RTC>` ::
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from pyb 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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PWM (pulse width modulation)
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----------------------------
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See :ref:`pyb.Pin <pyb.Pin>` and :ref:`pyb.Timer <pyb.Timer>`. ::
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from pyb import Pin, Timer
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p = Pin('X1') # X1 has TIM2, CH1
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tim = Timer(2, freq=1000)
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ch = tim.channel(1, Timer.PWM, pin=p)
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ch.pulse_width_percent(50)
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ADC (analog to digital conversion)
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----------------------------------
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See :ref:`pyb.Pin <pyb.Pin>` and :ref:`pyb.ADC <pyb.ADC>`. ::
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from pyb import Pin, ADC
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adc = ADC(Pin('X19'))
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adc.read() # read value, 0-4095
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DAC (digital to analog conversion)
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----------------------------------
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See :ref:`pyb.Pin <pyb.Pin>` and :ref:`pyb.DAC <pyb.DAC>`. ::
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from pyb import Pin, DAC
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dac = DAC(Pin('X5'))
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dac.write(120) # output between 0 and 255
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UART (serial bus)
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-----------------
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See :ref:`pyb.UART <pyb.UART>`. ::
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from pyb import UART
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uart = UART(1, 9600)
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uart.write('hello')
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uart.read(5) # read up to 5 bytes
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SPI bus
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-------
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See :ref:`pyb.SPI <pyb.SPI>`. ::
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from pyb import SPI
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spi = SPI(1, SPI.CONTROLLER, baudrate=200000, polarity=1, phase=0)
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spi.send('hello')
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spi.recv(5) # receive 5 bytes on the bus
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spi.send_recv('hello') # send and receive 5 bytes
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I2C bus
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-------
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Hardware I2C is available on the X and Y halves of the pyboard via ``I2C('X')``
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and ``I2C('Y')``. Alternatively pass in the integer identifier of the peripheral,
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eg ``I2C(1)``. Software I2C is also available by explicitly specifying the
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``scl`` and ``sda`` pins instead of the bus name. For more details see
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:ref:`machine.I2C <machine.I2C>`. ::
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from machine import I2C
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i2c = I2C('X', freq=400000) # create hardware I2c object
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i2c = I2C(scl='X1', sda='X2', freq=100000) # create software I2C object
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i2c.scan() # returns list of peripheral addresses
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i2c.writeto(0x42, 'hello') # write 5 bytes to peripheral with address 0x42
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i2c.readfrom(0x42, 5) # read 5 bytes from peripheral
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i2c.readfrom_mem(0x42, 0x10, 2) # read 2 bytes from peripheral 0x42, peripheral memory 0x10
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i2c.writeto_mem(0x42, 0x10, 'xy') # write 2 bytes to peripheral 0x42, peripheral memory 0x10
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Note: for legacy I2C support see :ref:`pyb.I2C <pyb.I2C>`.
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I2S bus
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-------
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See :ref:`machine.I2S <machine.I2S>`. ::
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from machine import I2S, Pin
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i2s = I2S(2, sck=Pin('Y6'), ws=Pin('Y5'), sd=Pin('Y8'), mode=I2S.TX, bits=16, format=I2S.STEREO, rate=44100, ibuf=40000) # create I2S object
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i2s.write(buf) # write buffer of audio samples to I2S device
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i2s = I2S(1, sck=Pin('X5'), ws=Pin('X6'), sd=Pin('Y4'), mode=I2S.RX, bits=16, format=I2S.MONO, rate=22050, ibuf=40000) # create I2S object
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i2s.readinto(buf) # fill buffer with audio samples from I2S device
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The I2S class is currently available as a Technical Preview. During the preview period, feedback from
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users is encouraged. Based on this feedback, the I2S class API and implementation may be changed.
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PYBv1.0/v1.1 has one I2S bus with id=2.
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PYBD-SFxW has two I2S buses with id=1 and id=2.
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I2S is shared with SPI.
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CAN bus (controller area network)
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---------------------------------
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See :ref:`pyb.CAN <pyb.CAN>`. ::
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from pyb import CAN
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can = CAN(1, CAN.LOOPBACK)
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can.setfilter(0, CAN.LIST16, 0, (123, 124, 125, 126))
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can.send('message!', 123) # send a message with id 123
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can.recv(0) # receive message on FIFO 0
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Internal accelerometer
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----------------------
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See :ref:`pyb.Accel <pyb.Accel>`. ::
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from pyb import Accel
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accel = Accel()
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print(accel.x(), accel.y(), accel.z(), accel.tilt())
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