pyboard 快速参考

以下引出线适用于 PYBv1.1。您还可以查看其它版本的 pyboard 的引出线: PYBv1.0 or PYBLITEv1.0-AC or PYBLITEv1.0 .

PYBv1.1 pinout

以下是 pyboard 的快速参考。若是第一次操作此板,请考虑先阅读以下章节:

一般板控制

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
											

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
											

内部 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
											

内部开关

pyb.Switch .

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

引脚和 GPIO

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
											

伺服控制

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
											

外部中断

pyb.ExtInt .

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

计时器

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 (实时时钟)

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
											

PWM (脉冲宽度调制)

pyb.Pin and 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 (模拟到数字转换)

pyb.Pin and pyb.ADC .

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

DAC (数字模拟转换)

pyb.Pin and pyb.DAC .

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

UART (串行总线)

pyb.UART .

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

SPI 总线

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
											

I2C 总线

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 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
											

Note: for legacy I2C support see pyb.I2C .

CAN (控制器区域网络) 总线

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
											

内部加速度计

pyb.Accel .

from pyb import Accel
accel = Accel()
print(accel.x(), accel.y(), accel.z(), accel.tilt())