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24 lines
627 B
Python
24 lines
627 B
Python
from spidev import SpiDev
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class MCP3008:
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def __init__(self, bus = 0, device = 0):
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self.bus, self.device = bus, device
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self.spi = SpiDev()
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self.open()
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self.spi.max_speed_hz = 1000000 # 1MHz
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def open(self):
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self.spi.open(self.bus, self.device)
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self.spi.max_speed_hz = 1000000 # 1MHz
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def read(self, channel = 0):
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cmd1 = 4 | 2 | (( channel & 4) >> 2)
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cmd2 = (channel & 3) << 6
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adc = self.spi.xfer2([cmd1, cmd2, 0])
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data = ((adc[1] & 15) << 8) + adc[2]
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return data
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def close(self):
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self.spi.close()
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