diff options
Diffstat (limited to 'esp8266/modules/ds18x20.py')
| -rw-r--r-- | esp8266/modules/ds18x20.py | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/esp8266/modules/ds18x20.py b/esp8266/modules/ds18x20.py index 66983f5bcc..9c5bb8eb6b 100644 --- a/esp8266/modules/ds18x20.py +++ b/esp8266/modules/ds18x20.py @@ -8,6 +8,7 @@ _WR_SCRATCH = const(0x4e) class DS18X20: def __init__(self, onewire): self.ow = onewire + self.buf = bytearray(9) def scan(self): return [rom for rom in self.ow.scan() if rom[0] == 0x28] @@ -21,10 +22,10 @@ class DS18X20: self.ow.reset(True) self.ow.select_rom(rom) self.ow.writebyte(_RD_SCRATCH) - buf = self.ow.read(9) - if self.ow.crc8(buf): + self.ow.readinto(self.buf) + if self.ow.crc8(self.buf): raise Exception('CRC error') - return buf + return self.buf def write_scratch(self, rom, buf): self.ow.reset(True) |