pyboard 快速参考手册

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pyboard 的快速参考

以下引脚分配适用于 PYBv1.1。您还可以查看其他版本的 pyboard 的引脚排列： PYBv1.0 或PYBLITEv1.0-AC 或 PYBLITEv1.0.

下面是 pyboard 的快速参考。如果这是您第一次使用该板，请考虑先阅读以下部分：

• 关于 pyboard 的一般信息
• pyboard 的 MicroPython 教程
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见 pyb.

1. import pyb
   
2. 
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3. pyb.repl_uart(pyb.UART(1, 9600)) # duplicate REPL on UART(1)
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4. pyb.wfi() # pause CPU, waiting for interrupt
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5. pyb.freq() # get CPU and bus frequencies
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6. pyb.freq(60000000) # set CPU freq to 60MHz
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7. pyb.stop() # stop CPU, waiting for external interrupt

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7 w0 j2 t2 A! l( p- x2 Z7 t" L& _延迟和计时

使用 time模块：

1. import time
   
2. 
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3. time.sleep(1)           # sleep for 1 second
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4. time.sleep_ms(500)      # sleep for 500 milliseconds
   
5. time.sleep_us(10)       # sleep for 10 microseconds
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6. start = time.ticks_ms() # get value of millisecond counter
   
7. delta = time.ticks_diff(time.ticks_ms(), start) # compute time difference

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内部 LED

见 pyb.LED.

1. from pyb import LED
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2. 
   
3. led = LED(1) # 1=red, 2=green, 3=yellow, 4=blue
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4. led.toggle()
   
5. led.on()
   
6. led.off()
   
7. 
   
8. # LEDs 3 and 4 support PWM intensity (0-255)
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9. LED(4).intensity()    # get intensity
   
10. LED(4).intensity(128) # set intensity to half

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内部开关

请参阅 pyb.Switch.

1. from pyb import Switch
   
2. 
   
3. sw = Switch()
   
4. sw.value() # returns True or False
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5. sw.callback(lambda: pyb.LED(1).toggle())

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引脚和 GPIO

请参阅 pyb.Pin.

1. from pyb import Pin
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2. 
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3. p_out = Pin('X1', Pin.OUT_PP)
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4. p_out.high()
   
5. p_out.low()
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6. 
   
7. p_in = Pin('X2', Pin.IN, Pin.PULL_UP)
   
8. p_in.value() # get value, 0 or 1

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请参阅pyb.Servo.

1. from pyb import Servo
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2. 
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3. s1 = Servo(1) # servo on position 1 (X1, VIN, GND)
   
4. s1.angle(45) # move to 45 degrees
   
5. s1.angle(-60, 1500) # move to -60 degrees in 1500ms
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6. s1.speed(50) # for continuous rotation servos

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请参阅 pyb.ExtInt.

1. from pyb import Pin, ExtInt
   
2. 
   
3. callback = lambda e: print("intr")
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4. ext = ExtInt(Pin('Y1'), ExtInt.IRQ_RISING, Pin.PULL_NONE, callback)

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计时器

请参阅pyb.Timer.

1. from pyb import Timer
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2. 
   
3. tim = Timer(1, freq=1000)
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4. tim.counter() # get counter value
   
5. tim.freq(0.5) # 0.5 Hz
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6. tim.callback(lambda t: pyb.LED(1).toggle())

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RTC（实时时钟）

请参阅 pyb.RTC

1. from pyb import RTC
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2. 
   
3. rtc = RTC()
   
4. rtc.datetime((2017, 8, 23, 1, 12, 48, 0, 0)) # set a specific date and time
   
5. rtc.datetime() # get date and time

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请参阅pyb.Pin 和 pyb.Timer.

1. from pyb import Pin, Timer
   
2. 
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3. p = Pin('X1') # X1 has TIM2, CH1
   
4. tim = Timer(2, freq=1000)
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5. ch = tim.channel(1, Timer.PWM, pin=p)
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6. ch.pulse_width_percent(50)

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ADC（模数转换）

请参阅pyb.Pin 和pyb.ADC.

1. from pyb import Pin, ADC
   
2. 
   
3. adc = ADC(Pin('X19'))
   
4. adc.read() # read value, 0-4095

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DAC（数模转换）

请参阅pyb.Pin 和 pyb.DAC.

1. from pyb import Pin, DAC
   
2. 
   
3. dac = DAC(Pin('X5'))
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4. dac.write(120) # output between 0 and 255

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' {- u! u  f4 uUART（串行总线）

请参阅 pyb.UART.

1. from pyb import UART
   
2. 
   
3. uart = UART(1, 9600)
   
4. uart.write('hello')
   
5. uart.read(5) # read up to 5 bytes

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SPI总线

请参阅 pyb.SPI.

1. from pyb import SPI
   
2. 
   
3. spi = SPI(1, SPI.MASTER, baudrate=200000, polarity=1, phase=0)
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4. spi.send('hello')
   
5. spi.recv(5) # receive 5 bytes on the bus
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6. spi.send_recv('hello') # send and receive 5 bytes

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. ~+ s; R% G% h; v2 G0 rI2C总线

硬件 I2C 可通过I2C('X') 和用于 pyboard 的 X 和 Y 两半 I2C('Y')。或者，传入外围设备的整数标识符，例如I2C(1)。通过显式指定 scl 和 sda 引脚而不是总线名称，也可以使用软件 I2C 。有关更多详细信息，请参阅 machine.I2C.

1. from machine import I2C
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2. 
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3. i2c = I2C('X', freq=400000)                 # create hardware I2c object
   
4. i2c = I2C(scl='X1', sda='X2', freq=100000)  # create software I2C object
   
5. 
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6. i2c.scan()                          # returns list of slave addresses
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7. i2c.writeto(0x42, 'hello')          # write 5 bytes to slave with address 0x42
   
8. i2c.readfrom(0x42, 5)               # read 5 bytes from slave
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9. 
   
10. i2c.readfrom_mem(0x42, 0x10, 2)     # read 2 bytes from slave 0x42, slave memory 0x10
    
11. i2c.writeto_mem(0x42, 0x10, 'xy')   # write 2 bytes to slave 0x42, slave memory 0x10

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注意：对于传统 I2C 支持，请参阅 pyb.I2C。

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参见 machine.I2S.

1. from machine import I2S, Pin
   
2. 
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3. 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
   
4. i2s.write(buf)             # write buffer of audio samples to I2S device
   
5. 
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6. 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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7. i2s.readinto(buf)          # fill buffer with audio samples from I2S device

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I2S 类目前作为技术预览版提供。在预览期间，鼓励用户提供反馈。基于此反馈，I2S 类 API 和实现可能会更改。

PYBv1.0/v1.1 有一个 I2S 总线，id=2。PYBD-SFxW 有两条 I2S 总线，id=1 和 id=2。I2S 与 SPI 共享。

0 }+ G4 ]6 @# M* u0 Q5 U) D( W% {2 SCAN总线（控制器局域网）

参见 pyb.CAN.

1. from pyb import CAN
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2. 
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3. can = CAN(1, CAN.LOOPBACK)
   
4. can.setfilter(0, CAN.LIST16, 0, (123, 124, 125, 126))
   
5. can.send('message!', 123)   # send a message with id 123
   
6. can.recv(0)                 # receive message on FIFO 0

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内部加速度计

参见pyb.Accel.

1. from pyb import Accel
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2. 
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3. accel = Accel()
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4. print(accel.x(), accel.y(), accel.z(), accel.tilt())

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