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import sys
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import time
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import smbus
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class TMP512(object):
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def __init__(self, address):
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self.bus = smbus.SMBus(1)
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self.address = address
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# Shunt Measurement Configuration
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# - turn off shunt/bus voltage measurement
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self.write_reg(0x00, 0x3998)
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# Temperature Measurement Configuration
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# - continous conversion at 1 conversion/second
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# - enable remote 1, remote 2 and local
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self.write_reg(0x01, 0xBE00)
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def _reverse16(self, value):
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""" A quick hack method for reversing byte order for a 16 bit value """
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str_val = '%04X' % value
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new_val = str_val[2:4] + str_val[0:2]
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return int(new_val, 16)
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def read_reg(self, reg):
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raw = self.bus.read_word_data(self.address, reg)
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return self._reverse16(raw)
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def write_reg(self, reg, data):
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raw = self._reverse16(data)
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self.bus.write_word_data(self.address, reg, raw)
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def reset(self):
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self.write_reg(0x00, 0xB998)
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time.sleep(1)
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def status(self):
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return self.read_reg(0x02)
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def device_id(self):
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return '0x%04X' % self.read_reg(0x1F)
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def _convert_temp(self, raw_val):
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# Raw temp is a 13 bit number, the units are 0.0625 C
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temp = (raw_val >> 3) * 0.0625
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# Convert C to F
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return (temp * 1.8) + 32
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def local_temp(self):
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return self._convert_temp(self.read_reg(0x08))
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def temp_sensor1(self):
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return self._convert_temp(self.read_reg(0x09))
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def temp_sensor2(self):
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return self._convert_temp(self.read_reg(0x0A))
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def main():
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import time
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tmp512_1 = TMP512(0x5d)
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tmp512_2 = TMP512(0x5c)
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print 'TMP512-1 status: 0x%04X' % tmp512_1.status()
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print 'TMP512-2 status: 0x%04X' % tmp512_2.status()
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print 'TMP512-1 local temp is %d' % tmp512_1.local_temp()
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print 'TMP512-2 local temp is %d' % tmp512_2.local_temp()
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print 'TMP512-1 remote 1 temp is %d' % tmp512_1.temp_sensor1()
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print 'TMP512-1 remote 2 temp is %d' % tmp512_1.temp_sensor2()
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print 'TMP512-2 remote 1 temp is %d' % tmp512_2.temp_sensor1()
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print 'TMP512-2 remote 2 temp is %d' % tmp512_2.temp_sensor2()
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print '---'
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time.sleep(1)
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print 'TMP512-1 remote 1 temp is %d' % tmp512_1.temp_sensor1()
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print 'TMP512-1 remote 2 temp is %d' % tmp512_1.temp_sensor2()
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print 'TMP512-2 remote 1 temp is %d' % tmp512_2.temp_sensor1()
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print 'TMP512-2 remote 2 temp is %d' % tmp512_2.temp_sensor2()
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print '---'
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time.sleep(1)
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print 'TMP512-1 remote 1 temp is %d' % tmp512_1.temp_sensor1()
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print 'TMP512-1 remote 2 temp is %d' % tmp512_1.temp_sensor2()
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print 'TMP512-2 remote 1 temp is %d' % tmp512_2.temp_sensor1()
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print 'TMP512-2 remote 2 temp is %d' % tmp512_2.temp_sensor2()
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if __name__ == '__main__':
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sys.exit(main())
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