diff options
Diffstat (limited to 'drivers/onewire/ds18x20.py')
| -rw-r--r-- | drivers/onewire/ds18x20.py | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/onewire/ds18x20.py b/drivers/onewire/ds18x20.py index a2f7f5c3da..342f4b28ae 100644 --- a/drivers/onewire/ds18x20.py +++ b/drivers/onewire/ds18x20.py @@ -93,6 +93,9 @@ class DS18X20(object): temp = temp_read - 0.25 + (count_per_c - count_remain) / count_per_c return temp elif rom0 == 0x28: - return (temp_msb << 8 | temp_lsb) / 16 + temp = (temp_msb << 8 | temp_lsb) / 16 + if (temp_msb & 0xf8) == 0xf8: # for negative temperature + temp -= 0x1000 + return temp else: assert False |