【MicroPython】ESP8266的MicroPython快速参考

dcexpert

【MicroPython】ESP8266的MicroPython快速参考 [复制链接]

 

 Quick reference for the ESP8266




开发板控制

1. import machine
   
2. 
   
3. machine.freq()          # get the current frequency of the CPU
   
4. machine.freq(160000000) # set the CPU frequency to 160 MHz

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ESP8266模块

1. import esp
   
2. 
   
3. esp.osdebug(None)       # turn off vendor O/S debugging messages
   
4. esp.osdebug(0)          # redirect vendor O/S debugging messages to UART(0)

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网络

1. import network
   
2. 
   
3. wlan = network.WLAN(network.STA_IF) # create station interface
   
4. wlan.active(True)       # activate the interface
   
5. wlan.scan()             # scan for access points
   
6. wlan.isconnected()      # check if the station is connected to an AP
   
7. wlan.connect('essid', 'password') # connect to an AP
   
8. wlan.config('mac')      # get the interface's MAC adddress
   
9. wlan.ifconfig()         # get the interface's IP/netmask/gw/DNS addresses
   
10. 
    
11. ap = network.WLAN(network.AP_IF) # create access-point interface
    
12. ap.active(True)         # activate the interface
    
13. ap.config(essid='ESP-AP') # set the ESSID of the access point

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连接到本地网络

1. def do_connect():
   
2.     import network
   
3.     wlan = network.WLAN(network.STA_IF)
   
4.     wlan.active(True)
   
5.     if not wlan.isconnected():
   
6.         print('connecting to network...')
   
7.         wlan.connect('essid', 'password')
   
8.         while not wlan.isconnected():
   
9.             pass
   
10.     print('network config:', wlan.ifconfig())

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延时和时间

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

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定时器

1. from machine import Timer
   
2. 
   
3. tim = Timer(-1)
   
4. tim.init(period=5000, mode=Timer.ONE_SHOT, callback=lambda t:print(1))
   
5. tim.init(period=2000, mode=Timer.PERIODIC, callback=lambda t:print(2))

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Pins 和 GPIO

1. from machine import Pin
   
2. 
   
3. p0 = Pin(0, Pin.OUT)    # create output pin on GPIO0
   
4. p0.high()               # set pin to high
   
5. p0.low()                # set pin to low
   
6. p0.value(1)             # set pin to high
   
7. 
   
8. p2 = Pin(2, Pin.IN)     # create input pin on GPIO2
   
9. print(p2.value())       # get value, 0 or 1
   
10. 
    
11. p4 = Pin(4, Pin.IN, Pin.PULL_UP) # enable internal pull-up resistor
    
12. p5 = Pin(5, Pin.OUT, value=1) # set pin high on creation
    

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PWM

1. from machine import Pin, PWM
   
2. 
   
3. pwm0 = PWM(Pin(0))      # create PWM object from a pin
   
4. pwm0.freq()             # get current frequency
   
5. pwm0.freq(1000)         # set frequency
   
6. pwm0.duty()             # get current duty cycle
   
7. pwm0.duty(200)          # set duty cycle
   
8. pwm0.deinit()           # turn off PWM on the pin
   
9. 
   
10. pwm2 = PWM(Pin(2), freq=500, duty=512) # create and configure in one go
    

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ADC (analog to digital conversion)

1. from machine import ADC
   
2. 
   
3. adc = ADC(0)            # create ADC object on ADC pin
   
4. adc.read()              # read value, 0-1024

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SPI

1. from machine import Pin, SPI
   
2. 
   
3. # construct an SPI bus on the given pins
   
4. # polarity is the idle state of SCK
   
5. # phase=0 means sample on the first edge of SCK, phase=1 means the second
   
6. spi = SPI(baudrate=100000, polarity=1, phase=0, sck=Pin(0), mosi=Pin(2), miso=Pin(4))
   
7. 
   
8. spi.init(baudrate=200000) # set the baudrate
   
9. 
   
10. spi.read(10)            # read 10 bytes on MISO
    
11. spi.read(10, 0xff)      # read 10 bytes while outputing 0xff on MOSI
    
12. 
    
13. buf = bytearray(50)     # create a buffer
    
14. spi.readinto(buf)       # read into the given buffer (reads 50 bytes in this case)
    
15. spi.readinto(buf, 0xff) # read into the given buffer and output 0xff on MOSI
    
16. 
    
17. spi.write(b'12345')     # write 5 bytes on MOSI
    
18. 
    
19. buf = bytearray(4)      # create a buffer
    
20. spi.write_readinto(b'1234', buf) # write to MOSI and read from MISO into the buffer
    
21. spi.write_readinto(buf, buf) # write buf to MOSI and read MISO back into buf
    

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I2C

1. from machine import Pin, I2C
   
2. 
   
3. # construct an I2C bus
   
4. i2c = I2C(scl=Pin(5), sda=Pin(4), freq=100000)
   
5. 
   
6. i2c.readfrom(0x3a, 4)   # read 4 bytes from slave device with address 0x3a
   
7. i2c.writeto(0x3a, '12') # write '12' to slave device with address 0x3a
   
8. 
   
9. buf = bytearray(10)     # create a buffer with 10 bytes
   
10. i2c.writeto(0x3a, buf)  # write the given buffer to the slave
    

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深度休眠

1. import machine
   
2. 
   
3. # configure RTC.ALARM0 to be able to wake the device
   
4. rtc = machine.RTC()
   
5. rtc.irq(trigger=rtc.ALARM0, wake=machine.DEEPSLEEP)
   
6. 
   
7. # check if the device woke from a deep sleep
   
8. if machine.reset_cause() == machine.DEEPSLEEP_RESET:
   
9.     print('woke from a deep sleep')
   
10. 
    
11. # set RTC.ALARM0 to fire after 10 seconds (waking the device)
    
12. rtc.alarm(rtc.ALARM0, 10000)
    
13. 
    
14. # put the device to sleep
    
15. machine.deepsleep()
    

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OneWire 单总线驱动

1. from machine import Pin
   
2. import onewire
   
3. 
   
4. ow = onewire.OneWire(Pin(12)) # create a OneWire bus on GPIO12
   
5. ow.scan()               # return a list of devices on the bus
   
6. ow.reset()              # reset the bus
   
7. ow.readbyte()           # read a byte
   
8. ow.read(5)              # read 5 bytes
   
9. ow.writebyte(0x12)      # write a byte on the bus
   
10. ow.write('123')         # write bytes on the bus
    
11. ow.select_rom(b'12345678') # select a specific device by its ROM code
    

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使用DS18B20:

1. import time
   
2. ds = onewire.DS18B20(ow)
   
3. roms = ds.scan()
   
4. ds.convert_temp()
   
5. time.sleep_ms(750)
   
6. for rom in roms:
   
7.     print(ds.read_temp(rom))
   

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NeoPixel 驱动

1. from machine import Pin
   
2. from neopixel import NeoPixel
   
3. 
   
4. pin = Pin(0, Pin.OUT)   # set GPIO0 to output to drive NeoPixels
   
5. np = NeoPixel(pin, 8)   # create NeoPixel driver on GPIO0 for 8 pixels
   
6. np[0] = (255, 255, 255) # set the first pixel to white
   
7. np.write()              # write data to all pixels
   
8. r, g, b = np[0]         # get first pixel colour
   

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1. import esp
   
2. esp.neopixel_write(pin, grb_buf, is800khz)

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APA102 驱动

1. from machine import Pin
   
2. from apa102 import APA102
   
3. 
   
4. clock = Pin(14, Pin.OUT)     # set GPIO14 to output to drive the clock
   
5. data = Pin(13, Pin.OUT)      # set GPIO13 to output to drive the data
   
6. apa = APA102(clock, data, 8) # create APA102 driver on the clock and the data pin for 8 pixels
   
7. apa[0] = (255, 255, 255, 31) # set the first pixel to white with a maximum brightness of 31
   
8. apa.write()                  # write data to all pixels
   
9. r, g, b, brightness = apa[0] # get first pixel colour

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1. import esp
   
2. esp.apa102_write(clock_pin, data_pin, rgbi_buf)

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WebREPL (web browser interactive prompt)

1. import webrepl
   
2. webrepl.start()
   

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转自：
http://docs.micropython.org/en/latest/esp8266/esp8266/quickref.html

suoma

都封装好了？

dcexpert

suoma 发表于 2016-6-11 20:13
都封装好了？

还没有全部完成吧，基础的东西可以用了。

wateras1

我还是不习惯用python编程，嵌入式编程语言主流还是C。

vzvxvcvv

看起来很不错！

johnrey

底层的module都是从micropython下载的么？还是已经在固件里面了？可以直接import

dcexpert

johnrey 发表于 2016-6-11 22:09
底层的module都是从micropython下载的么？还是已经在固件里面了？可以直接import

已经内置了很多库，在官方的文档中有初步的介绍。直接import就可以，就像在pyboard中一样。

johnrey

这货和nodemcu是不是就是一回事啊？除了串口界面芯片不同？感觉cpio少了点

allankliu

不知道是否已经支持常见的物联网协议：

MQTT + TLS
HTTP/REST + TLS
CoAP + D-TLS

在MODEM芯片中运行Python，MCU负责硬件管理，两者RPC通讯，各施其职。挺好的。

dcexpert

目前支持http、MQTT、json等，但是其它协议官方还没有，或许第三方有