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: $ y; h% \: q c! u& i- o
通用板控制见 pyb. - import pyb
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% K9 |2 Q3 l& I# o6 q0 \2 R0 ?- pyb.repl_uart(pyb.UART(1, 9600)) # duplicate REPL on UART(1), w# I4 r# P! ~# q+ o
- pyb.wfi() # pause CPU, waiting for interrupt1 x3 c+ `" h! m/ O5 B
- pyb.freq() # get CPU and bus frequencies' P; x a% k7 U% P) x
- pyb.freq(60000000) # set CPU freq to 60MHz1 [) _6 m% _: }% _. n7 |- t" x
- pyb.stop() # stop CPU, waiting for external interrupt
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延迟和计时使用 time模块: - import time
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O- |) i% D2 o% K4 j) \5 ]- i' C- time.sleep(1) # sleep for 1 second3 x( t3 y l5 n( Q3 e' U) k" v4 Q
- time.sleep_ms(500) # sleep for 500 milliseconds; `, P# A, v# a3 D, A
- time.sleep_us(10) # sleep for 10 microseconds. @0 |! e# J: f" b2 n
- start = time.ticks_ms() # get value of millisecond counter) Y/ e# H2 Z, ]0 f
- delta = time.ticks_diff(time.ticks_ms(), start) # compute time difference
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' G/ O1 B- s- F) E, v' m& l内部 LED见 pyb.LED. - from pyb import LED. l4 c# i6 {4 o E- P8 A
9 @2 a5 I/ S% D% l* V- led = LED(1) # 1=red, 2=green, 3=yellow, 4=blue; K% W( E" N: F
- led.toggle()
' V) {# F# I# c - led.on()
6 I2 f6 z d7 m! \ - led.off(): Q) g2 {8 i3 N1 L, K
3 |) v2 `" Z% `; Y4 j- # LEDs 3 and 4 support PWM intensity (0-255)
( N+ @4 d( t; F6 P$ g5 W - LED(4).intensity() # get intensity
) B! a+ s. E2 H! ] - LED(4).intensity(128) # set intensity to half
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内部开关请参阅 pyb.Switch. - from pyb import Switch
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0 g; J8 l* z! x0 z0 S- A1 ~ P$ v/ u- sw = Switch()
; |& ?' V q+ u; N - sw.value() # returns True or False# o7 Q" t5 Q: r; G1 r f7 O& B/ \( f/ t
- sw.callback(lambda: pyb.LED(1).toggle())
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引脚和 GPIO请参阅 pyb.Pin. - from pyb import Pin) ]$ e- O( S% \* M
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- p_out = Pin('X1', Pin.OUT_PP)) q6 [9 ?1 i, C; o1 W% y0 q: Q
- p_out.high()
. q$ V- p8 T( r) s) T" H - p_out.low(): ~8 t6 S# {$ _; n4 X# t
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- p_in = Pin('X2', Pin.IN, Pin.PULL_UP)
\; g4 L9 C: i - p_in.value() # get value, 0 or 1
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伺服控制请参阅pyb.Servo. - from pyb import Servo
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" c; [2 c! J; @2 c6 Y- s1 = Servo(1) # servo on position 1 (X1, VIN, GND)7 e) F* b; R" @, L5 Y
- s1.angle(45) # move to 45 degrees
4 U, ^; a$ H& V2 y( T. V9 ]; O' S" K - s1.angle(-60, 1500) # move to -60 degrees in 1500ms
* ?' V9 E9 C9 e4 T, t6 P/ O- a! N - s1.speed(50) # for continuous rotation servos
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外部中断请参阅 pyb.ExtInt. - from pyb import Pin, ExtInt
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- callback = lambda e: print("intr"): _3 S3 K0 \( y% P* ^
- ext = ExtInt(Pin('Y1'), ExtInt.IRQ_RISING, Pin.PULL_NONE, callback)
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计时器请参阅pyb.Timer. - from pyb import Timer N) L# F$ D m: [/ l8 U" @ C4 s( @
4 ]+ O+ \" W; v& n) T6 n6 Z- tim = Timer(1, freq=1000)
. s1 E4 s+ E. T! f# Y! O; l m - tim.counter() # get counter value
' }0 V w( f, ~5 N6 l - tim.freq(0.5) # 0.5 Hz+ w: T8 l6 x6 ^" A
- tim.callback(lambda t: pyb.LED(1).toggle())
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RTC(实时时钟)请参阅 pyb.RTC - from pyb import RTC4 k2 t3 P5 O; c6 Y
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- rtc = RTC()
. ? f1 M R) X% Y; G - rtc.datetime((2017, 8, 23, 1, 12, 48, 0, 0)) # set a specific date and time2 b V' r, a7 K- X4 |- w$ o
- rtc.datetime() # get date and time
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% S. }& Z, f- C2 I1 |PWM(脉宽调制)请参阅pyb.Pin 和 pyb.Timer. - from pyb import Pin, Timer
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- p = Pin('X1') # X1 has TIM2, CH1- o1 e* J5 i! R/ Y1 I7 H, ]
- tim = Timer(2, freq=1000), L) G1 S4 _* R: G$ _5 f
- ch = tim.channel(1, Timer.PWM, pin=p)
2 k# x* _& R. A( F$ F% G- T - ch.pulse_width_percent(50)
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2 d1 z7 s: j5 u, Y% i' E6 UADC(模数转换)请参阅pyb.Pin 和pyb.ADC. - from pyb import Pin, ADC& m4 I( B9 a8 w1 y
6 z2 G: b& }" `8 E& ~) N2 A- adc = ADC(Pin('X19'))
( Q5 O0 Z& ~! O; ^; ` - adc.read() # read value, 0-4095
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DAC(数模转换)请参阅pyb.Pin 和 pyb.DAC. - from pyb import Pin, DAC
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- dac = DAC(Pin('X5'))
$ z: J% g9 c3 R/ r* m - dac.write(120) # output between 0 and 255
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UART(串行总线)请参阅 pyb.UART. - from pyb import UART
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4 {0 [3 g3 G% I( j b" f9 e- uart = UART(1, 9600)
1 V, x; h* U# ]0 X - uart.write('hello')
( E, r. X7 g3 U- E - uart.read(5) # read up to 5 bytes
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SPI总线请参阅 pyb.SPI. - from pyb import SPI6 ^7 M# j, i8 x/ ?
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- spi = SPI(1, SPI.MASTER, baudrate=200000, polarity=1, phase=0)0 t! {/ Z8 \( e% g0 \* V' D
- spi.send('hello')
9 k( k" G4 d" N3 \8 J8 H - spi.recv(5) # receive 5 bytes on the bus+ l5 H6 a, z3 t5 g7 T' d7 \
- spi.send_recv('hello') # send and receive 5 bytes
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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 I2C8 I6 [% e M8 T5 N3 n
$ h' O) a- B* E. {2 E \$ G7 g$ ?" u- i2c = I2C('X', freq=400000) # create hardware I2c object
" N0 F: I: Y( G7 ] n" ]0 L7 i - i2c = I2C(scl='X1', sda='X2', freq=100000) # create software I2C object8 \( f9 m; W$ e' J8 j
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- i2c.scan() # returns list of slave addresses
% r# [/ f& m6 H1 m% `% q - i2c.writeto(0x42, 'hello') # write 5 bytes to slave with address 0x425 Z" \! u6 O4 K
- i2c.readfrom(0x42, 5) # read 5 bytes from slave8 ]: i% K$ `2 w
2 ~2 z) q7 z+ f# A Z' ~2 `$ ]- i2c.readfrom_mem(0x42, 0x10, 2) # read 2 bytes from slave 0x42, slave memory 0x10) o9 T5 L) {& j' \( f
- i2c.writeto_mem(0x42, 0x10, 'xy') # write 2 bytes to slave 0x42, slave memory 0x10
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' j' r: a! n' z% z. f. K1 u; ^0 N- \注意:对于传统 I2C 支持,请参阅 pyb.I2C。
( T7 k9 V# o5 sI2S总线参见 machine.I2S. - from machine import I2S, Pin% }0 q: }' o$ z
0 S4 ]) ]4 e" o& B! U7 u) e- 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 object3 |: G7 J# k( c. x5 w8 H8 m
- i2s.write(buf) # write buffer of audio samples to I2S device
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4 a+ W$ {+ l M: @3 s- 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
& P/ r, p7 R) K* t* y8 w" N* E - i2s.readinto(buf) # fill buffer with audio samples from I2S device
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1 A& U# k1 a6 z& p' T8 T0 II2S 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。
# V ?8 R z5 F \2 gCAN总线(控制器局域网)参见 pyb.CAN. - from pyb import CAN
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- can = CAN(1, CAN.LOOPBACK)
: h; f( I3 `9 I$ P2 B& g+ d, X7 P - can.setfilter(0, CAN.LIST16, 0, (123, 124, 125, 126))
% f2 y# E3 a2 `8 {+ ? - can.send('message!', 123) # send a message with id 123
, C* p: H1 U$ R# j, \ - can.recv(0) # receive message on FIFO 0
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. {4 {" `0 A( H! J内部加速度计参见pyb.Accel. - from pyb import Accel: T/ J$ }$ ?4 l( b1 z
. W% [4 q3 _: P! R {4 T( ]$ s- accel = Accel()( u: `$ |% T: B4 j/ }0 q
- print(accel.x(), accel.y(), accel.z(), accel.tilt())
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