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.. _pyboard_quickref:
Quick reference for the pyboard
===============================
The below pinout is for PYBv1.1. You can also view pinouts for
other versions of the pyboard:
`PYBv1.0 <http://micropython.org/resources/pybv10-pinout.jpg>`__
or `PYBLITEv1.0-AC <http://micropython.org/resources/pyblitev10ac-pinout.jpg>`__
or `PYBLITEv1.0 <http://micropython.org/resources/pyblitev10-pinout.jpg>`__.
.. only:: not latex
`PYBv1.1 pinout <http://micropython.org/resources/pybv11-pinout.jpg>`__
.. only:: latex
.. image:: http://micropython.org/resources/pybv11-pinout-800px.jpg
:alt: PYBv1.1 pinout
Below is a quick reference for the pyboard. If it is your first time working with
this board please consider reading the following sections first:
.. toctree::
:maxdepth: 1
general.rst
tutorial/index.rst
General board control
---------------------
See :mod:`pyb`. ::
import pyb
pyb.repl_uart(pyb.UART(1, 9600)) # duplicate REPL on UART(1)
pyb.wfi() # pause CPU, waiting for interrupt
pyb.freq() # get CPU and bus frequencies
pyb.freq(60000000) # set CPU freq to 60MHz
pyb.stop() # stop CPU, waiting for external interrupt
Delay and timing
----------------
Use the :mod:`time <time>` 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 value of millisecond counter
delta = time.ticks_diff(time.ticks_ms(), start) # compute time difference
Internal LEDs
-------------
See :ref:`pyb.LED <pyb.LED>`. ::
from pyb import LED
led = LED(1) # 1=red, 2=green, 3=yellow, 4=blue
led.toggle()
led.on()
led.off()
# LEDs 3 and 4 support PWM intensity (0-255)
LED(4).intensity() # get intensity
LED(4).intensity(128) # set intensity to half
Internal switch
---------------
See :ref:`pyb.Switch <pyb.Switch>`. ::
from pyb import Switch
sw = Switch()
sw.value() # returns True or False
sw.callback(lambda: pyb.LED(1).toggle())
Pins and GPIO
-------------
See :ref:`pyb.Pin <pyb.Pin>`. ::
from pyb import Pin
p_out = Pin('X1', Pin.OUT_PP)
p_out.high()
p_out.low()
p_in = Pin('X2', Pin.IN, Pin.PULL_UP)
p_in.value() # get value, 0 or 1
Servo control
-------------
See :ref:`pyb.Servo <pyb.Servo>`. ::
from pyb import Servo
s1 = Servo(1) # servo on position 1 (X1, VIN, GND)
s1.angle(45) # move to 45 degrees
s1.angle(-60, 1500) # move to -60 degrees in 1500ms
s1.speed(50) # for continuous rotation servos
External interrupts
-------------------
See :ref:`pyb.ExtInt <pyb.ExtInt>`. ::
from pyb import Pin, ExtInt
callback = lambda e: print("intr")
ext = ExtInt(Pin('Y1'), ExtInt.IRQ_RISING, Pin.PULL_NONE, callback)
Timers
------
See :ref:`pyb.Timer <pyb.Timer>`. ::
from pyb import Timer
tim = Timer(1, freq=1000)
tim.counter() # get counter value
tim.freq(0.5) # 0.5 Hz
tim.callback(lambda t: pyb.LED(1).toggle())
RTC (real time clock)
---------------------
See :ref:`pyb.RTC <pyb.RTC>` ::
from pyb import RTC
rtc = RTC()
rtc.datetime((2017, 8, 23, 0, 1, 12, 48, 0)) # set a specific date and
# time, eg. 2017/8/23 1:12:48
# the day-of-week value is ignored
rtc.datetime() # get date and time
PWM (pulse width modulation)
----------------------------
See :ref:`pyb.Pin <pyb.Pin>` and :ref:`pyb.Timer <pyb.Timer>`. ::
from pyb import Pin, Timer
p = Pin('X1') # X1 has TIM2, CH1
tim = Timer(2, freq=1000)
ch = tim.channel(1, Timer.PWM, pin=p)
ch.pulse_width_percent(50)
ADC (analog to digital conversion)
----------------------------------
See :ref:`pyb.Pin <pyb.Pin>` and :ref:`pyb.ADC <pyb.ADC>`. ::
from pyb import Pin, ADC
adc = ADC(Pin('X19'))
adc.read() # read value, 0-4095
DAC (digital to analog conversion)
----------------------------------
See :ref:`pyb.Pin <pyb.Pin>` and :ref:`pyb.DAC <pyb.DAC>`. ::
from pyb import Pin, DAC
dac = DAC(Pin('X5'))
dac.write(120) # output between 0 and 255
UART (serial bus)
-----------------
See :ref:`pyb.UART <pyb.UART>`. ::
from pyb import UART
uart = UART(1, 9600)
uart.write('hello')
uart.read(5) # read up to 5 bytes
SPI bus
-------
See :ref:`pyb.SPI <pyb.SPI>`. ::
from pyb import SPI
spi = SPI(1, SPI.CONTROLLER, baudrate=200000, polarity=1, phase=0)
spi.send('hello')
spi.recv(5) # receive 5 bytes on the bus
spi.send_recv('hello') # send and receive 5 bytes
I2C bus
-------
Hardware I2C is available on the X and Y halves of the pyboard via ``I2C('X')``
and ``I2C('Y')``. Alternatively pass in the integer identifier of the peripheral,
eg ``I2C(1)``. Software I2C is also available by explicitly specifying the
``scl`` and ``sda`` pins instead of the bus name. For more details see
:ref:`machine.I2C <machine.I2C>`. ::
from machine import I2C
i2c = I2C('X', freq=400000) # create hardware I2c object
i2c = I2C(scl='X1', sda='X2', freq=100000) # create software I2C object
i2c.scan() # returns list of peripheral addresses
i2c.writeto(0x42, 'hello') # write 5 bytes to peripheral with address 0x42
i2c.readfrom(0x42, 5) # read 5 bytes from peripheral
i2c.readfrom_mem(0x42, 0x10, 2) # read 2 bytes from peripheral 0x42, peripheral memory 0x10
i2c.writeto_mem(0x42, 0x10, 'xy') # write 2 bytes to peripheral 0x42, peripheral memory 0x10
Note: for legacy I2C support see :ref:`pyb.I2C <pyb.I2C>`.
I2S bus
-------
See :ref:`machine.I2S <machine.I2S>`. ::
from machine import I2S, Pin
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
i2s.write(buf) # write buffer of audio samples to I2S device
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
i2s.readinto(buf) # fill buffer with audio samples from I2S device
The I2S class is currently available as a Technical Preview. During the preview period, feedback from
users is encouraged. Based on this feedback, the I2S class API and implementation may be changed.
PYBv1.0/v1.1 has one I2S bus with id=2.
PYBD-SFxW has two I2S buses with id=1 and id=2.
I2S is shared with SPI.
CAN bus (controller area network)
---------------------------------
See :ref:`pyb.CAN <pyb.CAN>`. ::
from pyb import CAN
can = CAN(1, CAN.LOOPBACK)
can.setfilter(0, CAN.LIST16, 0, (123, 124, 125, 126))
can.send('message!', 123) # send a message with id 123
can.recv(0) # receive message on FIFO 0
Internal accelerometer
----------------------
See :ref:`pyb.Accel <pyb.Accel>`. ::
from pyb import Accel
accel = Accel()
print(accel.x(), accel.y(), accel.z(), accel.tilt())
|
