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--- mp_quick_reference [2021/10/02 22:02]
gongyusu 创建
+++ mp_quick_reference [2021/10/16 15:23] (当前版本)
gongyusu
@@ 行 1: / 行 1: @@
 ## 基于PICO学习板的快速参考指南
 {{:pico_learningkit_functions.png|}}<WRAP centeralign> PICO学习板功能及对应的管脚</WRAP>
+#### 1. 通用的板卡控制
+<code python>
+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
+</code>
+#### 2. 延迟和定时
+<code python>
+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
+</code>
+#### 3. LEDs
+<code python>
+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)
+</code>
+#### 4. 板上按键
+<code python>
+import machine
+key1 = machine.Pin(12, machine.Pin.IN, machine.Pin.PULL_UP)
+key2 = machine.Pin(13, machine.Pin.IN, machine.Pin.PULL_UP)
+</code>
+#### 5. 管脚和GPIO
+<code python>
+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
+</code>
+#### 6. 定时器
+<code python>
+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())
+</code>
+#### 7. PWM
+<code python>
+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
+</code>
+#### 8. ADC
+<code python>
+from pyb import Pin, ADC
+adc = ADC(Pin('X19'))
+adc.read() # read value, 0-4095
+</code>
+#### 9. UART
+<code python>
+from pyb import UART
+uart = UART(1, 9600)
+uart.write('hello')
+uart.read(5) # read up to 5 bytes
+</code>
+#### 10. SPI总线
+<code python>
+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
+</code>
+#### 11. I2C总线
+<code python>
+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
+</code>
+#### 12. 姿态传感器
+<code python>
+from pyb import Accel
+accel = Accel()
+print(accel.x(), accel.y(), accel.z(), accel.tilt())
+</code>
+#### 13. WS2812B控制
+<code python>
+</code>
+#### 14. 蜂鸣器的控制
+<code python>
+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)
+</code>