MCP3008 SPI BBIO

from Adafruit_BBIO.SPI import SPI

SPI0_CS0  = "P9_17"
SPI0_D0   = "P9_21"
SPI0_D1   = "P9_18"
SPI0_SCLK = "P9_22"

spi = SPI(1, 0)

class MCP3008:
    def __init__(self, bus = 0, device = 0):
        self.bus, self.device = bus, device
        self.spi = SPI()
        self.open()

    def open(self):
        self.spi.open(self.bus, self.device)

    def read(self, channel = 0):
        adc = self.spi.xfer2([1, (8 + channel) << 4, 0])
        data = ((adc[1] & 3) << 8) + adc[2]
        return data

    def close(self):
        self.spi.close()