bmp180.py 文件源码

def makegauge(self):
        '''
        Generator refreshing the raw measurments.
        '''
        delays = (5, 8, 14, 25)
        while True:
            self._bmp_i2c.writeto_mem(self._bmp_addr, 0xF4, bytearray([0x2E]))
            t_start = time.ticks_ms()
            while (time.ticks_ms() - t_start) <= 5: # 5mS delay
                yield None
            try:
                self.UT_raw = self._bmp_i2c.readfrom_mem(self._bmp_addr, 0xF6, 2)
            except:
                yield None
            self._bmp_i2c.writeto_mem(self._bmp_addr, 0xF4, bytearray([0x34+(self.oversample_setting << 6)]))
            t_pressure_ready = delays[self.oversample_setting]
            t_start = time.ticks_ms()
            while (time.ticks_ms() - t_start) <= t_pressure_ready:
                yield None
            try:
                self.MSB_raw = self._bmp_i2c.readfrom_mem(self._bmp_addr, 0xF6, 1)
                self.LSB_raw = self._bmp_i2c.readfrom_mem(self._bmp_addr, 0xF7, 1)
                self.XLSB_raw = self._bmp_i2c.readfrom_mem(self._bmp_addr, 0xF8, 1)
            except:
                yield None
            yield True