kopia lustrzana https://github.com/micropython/micropython
103 wiersze
2.6 KiB
Python
103 wiersze
2.6 KiB
Python
# FeatherS2 MicroPython Helper Library
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# 2021 Seon Rozenblum - Unexpected Maker
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#
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# Project home:
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# https://feathers2.io
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#
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# 2021-Mar-21 - v0.1 - Initial implementation
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# Import required libraries
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from micropython import const
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from machine import Pin, SPI, ADC
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import machine, time
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# FeatherS2 Hardware Pin Assignments
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# LDO
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LDO2 = const(21)
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# APA102 Dotstar pins
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DOTSTAR_CLK = const(45)
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DOTSTAR_DATA = const(40)
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# SPI
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SPI_MOSI = const(35)
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SPI_MISO = const(37)
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SPI_CLK = const(36)
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# I2C
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I2C_SDA = const(8)
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I2C_SCL = const(9)
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# DAC
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DAC1 = const(17)
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DAC2 = const(18)
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# LED & Ambient Light Sensor
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LED = const(13)
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AMB_LIGHT = const(4)
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# Helper functions
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# LED & Ambient Light Sensor control
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def set_led(state):
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l = Pin(LED, Pin.OUT)
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l.value(state)
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def toggle_led(state):
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l = Pin(LED, Pin.OUT)
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l.value(not l.value())
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# Create ADC and set attenuation and return the ambient light value from the onboard sensor
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def get_amb_light():
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adc = ADC(Pin(AMB_LIGHT))
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adc.atten(ADC.ATTN_11DB)
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return adc.read()
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# LDO2 power control
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# When we manually turn off the second LDO we also set the DotStar DATA and CLK pins to input to
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# prevent parasitic power from lighting the LED even with the LDO off, causing current use.
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# The DotStar is a beautiful LED, but parasitic power makes it a terrible choice for battery use :(
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def set_ldo2_power(state):
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"""Set the power for the on-board Dotstar to allow no current draw when not needed."""
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# Set the power pin to the inverse of state
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ldo2 = Pin(LDO2, Pin.OUT)
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ldo2.value(state)
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if state:
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Pin(DOTSTAR_CLK, Pin.OUT)
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Pin(DOTSTAR_DATA, Pin.OUT) # If power is on, set CLK to be output, otherwise input
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else:
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Pin(DOTSTAR_CLK, Pin.IN)
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Pin(DOTSTAR_DATA, Pin.IN) # If power is on, set CLK to be output, otherwise input
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# A small delay to let the IO change state
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time.sleep(0.035)
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# Dotstar rainbow colour wheel
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def dotstar_color_wheel(wheel_pos):
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"""Color wheel to allow for cycling through the rainbow of RGB colors."""
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wheel_pos = wheel_pos % 255
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if wheel_pos < 85:
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return 255 - wheel_pos * 3, 0, wheel_pos * 3
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elif wheel_pos < 170:
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wheel_pos -= 85
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return 0, wheel_pos * 3, 255 - wheel_pos * 3
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else:
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wheel_pos -= 170
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return wheel_pos * 3, 255 - wheel_pos * 3, 0
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# Go into deep sleep but shut down the APA first to save power
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# Use this if you want lowest deep sleep current
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def go_deepsleep(t):
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"""Deep sleep helper that also powers down the on-board Dotstar."""
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set_ldo2_power(False)
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machine.deepsleep(t)
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