130 lines
2.6 KiB
ReStructuredText
130 lines
2.6 KiB
ReStructuredText
.. _quickref:
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Quick reference for the pyboard
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===============================
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.. image:: http://micropython.org/static/resources/pybv10-pinout.jpg
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:alt: AMP skin
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:width: 700px
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General board control
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---------------------
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::
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import pyb
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pyb.delay(50) # wait 50 milliseconds
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pyb.millis() # number of milliseconds since bootup
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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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LEDs
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----
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::
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from pyb import LED
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led = LED(1) # red led
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led.toggle()
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led.on()
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led.off()
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Pins and GPIO
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-------------
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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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External interrupts
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-------------------
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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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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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PWM (pulse width modulation)
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----------------------------
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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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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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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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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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from pyb import SPI
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spi = SPI(1, SPI.MASTER, 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 a receive 5 bytes
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I2C bus
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-------
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from pyb import I2C
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i2c = I2C(1, I2C.MASTER, baudrate=100000)
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i2c.scan() # returns list of slave addresses
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i2c.send('hello', 0x42) # send 5 bytes to slave with address 0x42
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i2c.recv(5, 0x42) # receive 5 bytes from slave
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i2c.mem_read(2, 0x42, 0x10) # read 2 bytes from slave 0x42, slave memory 0x10
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i2c.mem_write('xy', 0x42, 0x10) # write 2 bytes to slave 0x42, slave memory 0x10
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