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Extend 'set_blink_rate()' to turn off display with value of '-1' #27

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Extend 'set_blink_rate()' to turn off display with value of '-1' #27

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d250242
Extend 'set_blink_rate()' to turn off display with value of '-1'
mungewell Nov 19, 2025
74a057e
Make '-1' toggle display on/off
mungewell Nov 20, 2025
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13 changes: 11 additions & 2 deletions ht16k33/ht16k33.py
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Original file line number Diff line number Diff line change
Expand Up @@ -17,13 +17,14 @@ class HT16K33:
HT16K33_GENERIC_SYSTEM_OFF = 0x20
HT16K33_GENERIC_DISPLAY_ADDRESS = 0x00
HT16K33_GENERIC_CMD_BRIGHTNESS = 0xE0
HT16K33_GENERIC_CMD_BLINK = 0x81
HT16K33_GENERIC_CMD_BLINK = 0x80

# *********** PRIVATE PROPERTIES **********

i2c = None
address = 0
brightness = 15
display_on = 1
flash_rate = 0

# *********** CONSTRUCTOR **********
Expand All @@ -45,10 +46,16 @@ def set_blink_rate(self, rate=0):
Args:
rate (int): The chosen flash rate. Default: 0Hz (no flash).
"""
if rate < 0:
self.display_on = not self.display_on
rate = 0
else:
self.display_on = 1

allowed_rates = (0, 2, 1, 0.5)
assert rate in allowed_rates, "ERROR - Invalid blink rate set in set_blink_rate()"
self.blink_rate = allowed_rates.index(rate) & 0x03
self._write_cmd(self.HT16K33_GENERIC_CMD_BLINK | self.blink_rate << 1)
self._write_cmd(self.HT16K33_GENERIC_CMD_BLINK | self.blink_rate << 1 | self.display_on)

def set_brightness(self, brightness=15):
"""
Expand Down Expand Up @@ -94,11 +101,13 @@ def power_on(self):
"""
self._write_cmd(self.HT16K33_GENERIC_SYSTEM_ON)
self._write_cmd(self.HT16K33_GENERIC_DISPLAY_ON)
display_on = 1

def power_off(self):
"""
Power on the controller and display.
"""
display_on = 0
self._write_cmd(self.HT16K33_GENERIC_DISPLAY_OFF)
self._write_cmd(self.HT16K33_GENERIC_SYSTEM_OFF)

Expand Down