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

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

from machine import Pin
 
led_y = Pin(20,Pin.OUT)  
led_r = Pin(26,Pin.OUT)  
led_g = Pin(22,Pin.OUT)  
led_b = Pin(21,Pin.OUT)

import machine
 
key1 = machine.Pin(12, machine.Pin.IN, machine.Pin.PULL_UP)
key2 = machine.Pin(13, machine.Pin.IN, machine.Pin.PULL_UP)

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

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())

import machine
import utime
beep = machine.PWM(machine.Pin(22))
beep.freq(1000)   #频率
while True:
     beep.duty_u16(100)  #改变占空比改变蜂鸣器的响度

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

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

from pyb import SPI
 
spi = SPI(1, SPI.CONTROLLER, 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

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 peripheral addresses
i2c.writeto(0x42, 'hello')          # write 5 bytes to peripheral with address 0x42
i2c.readfrom(0x42, 5)               # read 5 bytes from peripheral
 
i2c.readfrom_mem(0x42, 0x10, 2)     # read 2 bytes from peripheral 0x42, peripheral memory 0x10
i2c.writeto_mem(0x42, 0x10, 'xy')   # write 2 bytes to peripheral 0x42, peripheral memory 0x10

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

from machine import Pin, PWM
from utime import sleep
 
buzzer = PWM(Pin(22))
buzzer.freq(500)
buzzer.duty_u16(1000)
sleep(1)
buzzer.duty_u16(0)