Merge pull request mcauser#3 from larsks/feature/dots

allow dots in strings

Author: mcauser

tm1637.py

@@ -173,3 +173,29 @@ def scroll(self, string, delay=250):
  for i in range(len(segments) + 5):
  self.write(data[0+i:4+i])
  sleep_ms(delay)
+
+
+class TM1637Decimal(TM1637):
+ """Library for quad 7-segment LED modules based on the TM1637 LED driver.
+
+ This class is meant to be used with decimal display modules (modules
+ that have a decimal point after each 7-segment LED).
+ """
+
+ def encode_string(self, string):
+ """Convert a string to LED segments.
+
+ Convert an up to 4 character length string containing 0-9, a-f,
+ space, dash and '.' to an array of segments, matching the length of
+ the source string.
+ """
+
+ segments = bytearray(len(string))
+ j = 0
+ for i in range(len(string)):
+ if string[i] == '.' and j > 0:
+ segments[j-1] |= 0b10000000
+ continue
+ segments[j] = self.encode_char(string[i])
+ j += 1
+ return segments