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:
通用板控制见 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
复制代码
延迟和计时使用 time模块: - 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
复制代码
内部 LED见 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
复制代码
内部开关请参阅 pyb.Switch. - from pyb import Switch
- sw = Switch()
- sw.value() # returns True or False
- sw.callback(lambda: pyb.LED(1).toggle())
复制代码
引脚和 GPIO请参阅 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
复制代码
伺服控制请参阅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
复制代码
外部中断请参阅 pyb.ExtInt. - from pyb import Pin, ExtInt
- callback = lambda e: print("intr")
- ext = ExtInt(Pin('Y1'), ExtInt.IRQ_RISING, Pin.PULL_NONE, callback)
复制代码
计时器请参阅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())
复制代码
RTC(实时时钟)请参阅 pyb.RTC - from pyb import RTC
- rtc = RTC()
- rtc.datetime((2017, 8, 23, 1, 12, 48, 0, 0)) # set a specific date and time
- rtc.datetime() # get date and time
复制代码
PWM(脉宽调制)请参阅pyb.Pin 和 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)
复制代码
ADC(模数转换)请参阅pyb.Pin 和pyb.ADC. - from pyb import Pin, ADC
- adc = ADC(Pin('X19'))
- adc.read() # read value, 0-4095
复制代码
DAC(数模转换)请参阅pyb.Pin 和 pyb.DAC. - from pyb import Pin, DAC
- dac = DAC(Pin('X5'))
- dac.write(120) # output between 0 and 255
复制代码
UART(串行总线)请参阅 pyb.UART. - from pyb import UART
- uart = UART(1, 9600)
- uart.write('hello')
- uart.read(5) # read up to 5 bytes
复制代码
SPI总线请参阅 pyb.SPI. - from pyb import SPI
- spi = SPI(1, SPI.MASTER, 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
复制代码
I2C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. - 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 slave addresses
- i2c.writeto(0x42, 'hello') # write 5 bytes to slave with address 0x42
- i2c.readfrom(0x42, 5) # read 5 bytes from slave
- i2c.readfrom_mem(0x42, 0x10, 2) # read 2 bytes from slave 0x42, slave memory 0x10
- i2c.writeto_mem(0x42, 0x10, 'xy') # write 2 bytes to slave 0x42, slave memory 0x10
复制代码
注意:对于传统 I2C 支持,请参阅 pyb.I2C。
I2S总线参见 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
复制代码
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。
CAN总线(控制器局域网)参见 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
复制代码
内部加速度计参见pyb.Accel. - from pyb import Accel
- accel = Accel()
- print(accel.x(), accel.y(), accel.z(), accel.tilt())
复制代码
|