def test_revision_1(self):
with patch('__builtin__.open') as mock_open:
handle = mock_open.return_value.__enter__.return_value
handle.__iter__.return_value = iter(['Revision : 0000'])
rev = Platform.pi_revision()
self.assertEquals(rev, 1)
with patch('__builtin__.open') as mock_open:
handle = mock_open.return_value.__enter__.return_value
handle.__iter__.return_value = iter(['Revision : 0002'])
rev = Platform.pi_revision()
self.assertEquals(rev, 1)
with patch('__builtin__.open') as mock_open:
handle = mock_open.return_value.__enter__.return_value
handle.__iter__.return_value = iter(['Revision : 0003'])
rev = Platform.pi_revision()
self.assertEquals(rev, 1)
def get_default_bus():
"""Return the default bus number based on the device platform. For a
Raspberry Pi either bus 0 or 1 (based on the Pi revision) will be returned.
For a Beaglebone Black the first user accessible bus, 1, will be returned.
"""
plat = Platform.platform_detect()
if plat == Platform.RASPBERRY_PI:
if Platform.pi_revision() == 1:
# Revision 1 Pi uses I2C bus 0.
return 0
else:
# Revision 2 Pi uses I2C bus 1.
return 1
elif plat == Platform.BEAGLEBONE_BLACK:
# Beaglebone Black has multiple I2C buses, default to 1 (P9_19 and P9_20).
return 1
else:
raise RuntimeError('Could not determine default I2C bus for platform.')
