8a237237a3
To signify that this ADC documentation is specific to the WiPy, and to make way for a standardised ADC documentation.
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228 lines
6.1 KiB
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.. _wipy_quickref:
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Quick reference for the WiPy
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============================
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.. image:: https://raw.githubusercontent.com/wipy/wipy/master/docs/PinOUT.png
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:alt: WiPy pinout and alternate functions table
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:width: 800px
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Below is a quick reference for CC3200/WiPy. If it is your first time
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working with 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 (including sleep modes)
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---------------------------------------------
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See the :mod:`machine` module::
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import machine
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help(machine) # display all members from the machine module
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machine.freq() # get the CPU frequency
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machine.unique_id() # return the 6-byte unique id of the board (the WiPy's MAC address)
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machine.idle() # average current decreases to (~12mA), any interrupts wake it up
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machine.lightsleep() # everything except for WLAN is powered down (~950uA avg. current)
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# wakes from Pin, RTC or WLAN
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machine.deepsleep() # deepest sleep mode, MCU starts from reset. Wakes from Pin and RTC.
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Pins and GPIO
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-------------
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See :ref:`machine.Pin <machine.Pin>`. ::
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from machine import Pin
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# initialize GP2 in gpio mode (alt=0) and make it an output
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p_out = Pin('GP2', mode=Pin.OUT)
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p_out.value(1)
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p_out.value(0)
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p_out.toggle()
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p_out(True)
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# make GP1 an input with the pull-up enabled
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p_in = Pin('GP1', mode=Pin.IN, pull=Pin.PULL_UP)
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p_in() # get value, 0 or 1
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Timers
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------
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See :ref:`machine.TimerWiPy <machine.TimerWiPy>` and :ref:`machine.Pin <machine.Pin>`.
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Timer ``id``'s take values from 0 to 3.::
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from machine import Timer
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from machine import Pin
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tim = Timer(0, mode=Timer.PERIODIC)
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tim_a = tim.channel(Timer.A, freq=1000)
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tim_a.freq(5) # 5 Hz
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p_out = Pin('GP2', mode=Pin.OUT)
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tim_a.irq(trigger=Timer.TIMEOUT, handler=lambda t: p_out.toggle())
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PWM (pulse width modulation)
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----------------------------
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See :ref:`machine.Pin <machine.Pin>` and :ref:`machine.Timer <machine.Timer>`. ::
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from machine import Timer
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# timer 1 in PWM mode and width must be 16 buts
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tim = Timer(1, mode=Timer.PWM, width=16)
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# enable channel A @1KHz with a 50.55% duty cycle
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tim_a = tim.channel(Timer.A, freq=1000, duty_cycle=5055)
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ADC (analog to digital conversion)
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----------------------------------
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See :ref:`machine.ADCWiPy <machine.ADCWiPy>`. ::
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from machine import ADC
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adc = ADC()
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apin = adc.channel(pin='GP3')
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apin() # read value, 0-4095
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UART (serial bus)
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-----------------
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See :ref:`machine.UART <machine.UART>`. ::
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from machine import UART
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uart = UART(0, baudrate=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:`machine.SPI <machine.SPI>`. ::
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from machine import SPI
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# configure the SPI master @ 2MHz
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spi = SPI(0, SPI.MASTER, baudrate=200000, polarity=0, phase=0)
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spi.write('hello')
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spi.read(5) # receive 5 bytes on the bus
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rbuf = bytearray(5)
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spi.write_readinto('hello', rbuf) # send and receive 5 bytes
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I2C bus
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-------
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See :ref:`machine.I2C <machine.I2C>`. ::
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from machine import I2C
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# configure the I2C bus
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i2c = I2C(baudrate=100000)
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i2c.scan() # returns list of slave addresses
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i2c.writeto(0x42, 'hello') # send 5 bytes to slave with address 0x42
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i2c.readfrom(0x42, 5) # receive 5 bytes from slave
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i2c.readfrom_mem(0x42, 0x10, 2) # read 2 bytes from slave 0x42, slave memory 0x10
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i2c.writeto_mem(0x42, 0x10, 'xy') # write 2 bytes to slave 0x42, slave memory 0x10
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Watchdog timer (WDT)
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--------------------
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See :ref:`machine.WDT <machine.WDT>`. ::
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from machine import WDT
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# enable the WDT with a timeout of 5s (1s is the minimum)
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wdt = WDT(timeout=5000)
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wdt.feed()
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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() # init with default time and date
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rtc = RTC(datetime=(2015, 8, 29, 9, 0, 0, 0, None)) # init with a specific time and date
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print(rtc.now())
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def alarm_handler (rtc_o):
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pass
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# do some non blocking operations
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# warning printing on an irq via telnet is not
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# possible, only via UART
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# create a RTC alarm that expires after 5 seconds
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rtc.alarm(time=5000, repeat=False)
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# enable RTC interrupts
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rtc_i = rtc.irq(trigger=RTC.ALARM0, handler=alarm_handler, wake=machine.SLEEP)
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# go into suspended mode waiting for the RTC alarm to expire and wake us up
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machine.lightsleep()
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SD card
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-------
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See :ref:`machine.SD <machine.SD>`. ::
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from machine import SD
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import os
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# clock pin, cmd pin, data0 pin
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sd = SD(pins=('GP10', 'GP11', 'GP15'))
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# or use default ones for the expansion board
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sd = SD()
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os.mount(sd, '/sd')
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WLAN (WiFi)
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-----------
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See :ref:`network.WLAN <network.WLAN>` and :mod:`machine`. ::
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import machine
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from network import WLAN
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# configure the WLAN subsystem in station mode (the default is AP)
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wlan = WLAN(mode=WLAN.STA)
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# go for fixed IP settings
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wlan.ifconfig(config=('192.168.0.107', '255.255.255.0', '192.168.0.1', '8.8.8.8'))
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wlan.scan() # scan for available networks
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wlan.connect(ssid='mynetwork', auth=(WLAN.WPA2, 'mynetworkkey'))
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while not wlan.isconnected():
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pass
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print(wlan.ifconfig())
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# enable wake on WLAN
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wlan.irq(trigger=WLAN.ANY_EVENT, wake=machine.SLEEP)
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# go to sleep
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machine.lightsleep()
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# now, connect to the FTP or the Telnet server and the WiPy will wake-up
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Telnet and FTP server
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---------------------
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See :class:`network.Server` ::
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from network import Server
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# init with new user, password and seconds timeout
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server = Server(login=('user', 'password'), timeout=60)
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server.timeout(300) # change the timeout
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server.timeout() # get the timeout
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server.isrunning() # check whether the server is running or not
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Heart beat LED
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--------------
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See :mod:`wipy`. ::
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import wipy
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wipy.heartbeat(False) # disable the heartbeat LED
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wipy.heartbeat(True) # enable the heartbeat LED
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wipy.heartbeat() # get the heartbeat state
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