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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def GoZero(self, speed):
        ' Go to Zero position '
        self.ReleaseSW()

        spi.SPI_write_byte(self.CS, 0x82 | (self.Dir & 1))       # Go to Zero
        spi.SPI_write_byte(self.CS, 0x00)
        spi.SPI_write_byte(self.CS, speed)  
        while self.IsBusy():
            pass
        time.sleep(0.3)
        self.ReleaseSW()