Compat mode pigpio

RPLCD/gpio.py

@@ -36,9 +36,6 @@
 else:
     from time import perf_counter as now
 
-# Duration to rate-limit calls to _send
-COMPAT_MODE_WAIT_TIME = 0.001
-
 PinConfig = namedtuple('PinConfig', 'rs rw e d0 d1 d2 d3 d4 d5 d6 d7 backlight mode')
 
 
@@ -99,10 +96,6 @@ def __init__(self, numbering_mode=None, pin_rs=None, pin_rw=None, pin_e=None, pi
         :type compat_mode: bool
 
         """
-        # Configure compatibility mode
-        self.compat_mode = compat_mode
-        if compat_mode:
-            self.last_send_event = now()
 
         # Set attributes
         if numbering_mode == GPIO.BCM or numbering_mode == GPIO.BOARD:
@@ -136,7 +129,8 @@ def __init__(self, numbering_mode=None, pin_rs=None, pin_rw=None, pin_e=None, pi
         # Call superclass
         super(CharLCD, self).__init__(cols, rows, dotsize,
                                       charmap=charmap,
-                                      auto_linebreaks=auto_linebreaks)
+                                      auto_linebreaks=auto_linebreaks,
+                                      compat_mode=compat_mode)
 
         # Set backlight status
         if pin_backlight is not None:
@@ -243,8 +237,4 @@ def _pulse_enable(self):
         GPIO.output(self.pins.e, 0)
         c.usleep(100)  # commands need > 37us to settle
 
-    def _wait(self):
-        """Rate limit the number of send events."""
-        end = self.last_send_event + COMPAT_MODE_WAIT_TIME
-        while now() < end:
-            pass
+

RPLCD/lcd.py

@@ -27,7 +27,14 @@
 from . import codecs
 from . import common as c
 from .compat import range
+import sys
+if sys.version_info.major < 3:
+    from time import clock as now
+else:
+    from time import perf_counter as now
 
+# Duration to rate-limit calls to _send
+COMPAT_MODE_WAIT_TIME = 0.001
 
 LCDConfig = namedtuple('LCDConfig', 'rows cols dotsize')
 
@@ -38,7 +45,7 @@ class BaseCharLCD(object):
 
     # Init, setup, teardown
 
-    def __init__(self, cols=20, rows=4, dotsize=8, charmap='A02', auto_linebreaks=True):
+    def __init__(self, cols=20, rows=4, dotsize=8, charmap='A02', auto_linebreaks=True, compat_mode=False):
         """
         Character LCD controller. Base class only, you should use a subclass.
 
@@ -117,6 +124,8 @@ def __init__(self, cols=20, rows=4, dotsize=8, charmap='A02', auto_linebreaks=Tr
         else:
             raise ValueError('Invalid data bus mode: {}'.format(self.data_bus_mode))
 
+
+
         # Write configuration to display
         self.command(c.LCD_FUNCTIONSET | displayfunction)
         c.usleep(50)
@@ -137,6 +146,11 @@ def __init__(self, cols=20, rows=4, dotsize=8, charmap='A02', auto_linebreaks=Tr
         self.command(c.LCD_ENTRYMODESET | self._text_align_mode | self._display_shift_mode)
         c.usleep(50)
 
+        # Configure compatibility mode
+        self.compat_mode = compat_mode
+        if compat_mode:
+            self.last_send_event = now()
+
     def close(self, clear=False):
         if clear:
             self.clear()
@@ -239,6 +253,12 @@ def _set_cursor_mode(self, value):
     cursor_mode = property(_get_cursor_mode, _set_cursor_mode,
             doc='How the cursor should behave (``hide``, ``line`` or ``blink``).')
 
+    def _wait(self):
+        """Rate limit the number of send events."""
+        end = self.last_send_event + COMPAT_MODE_WAIT_TIME
+        while now() < end:
+            pass
+
     # High level commands
 
     def write_string(self, value):
@@ -446,3 +466,4 @@ def lf(self):  # type: () -> None
     def crlf(self):  # type: () -> None
         """Write a line feed and a carriage return (``\\r\\n``) character to the LCD."""
         self.write_string('\r\n')
+

RPLCD/pigpio.py

@@ -31,6 +31,11 @@
 from .lcd import BaseCharLCD
 from .compat import range
 
+import sys
+if sys.version_info.major < 3:
+    from time import clock as now
+else:
+    from time import perf_counter as now
 
 # https://diarmuid.ie/blog/pwm-exponential-led-fading-on-arduino-or-other-platforms/
 # p 101 .. maximum value of the PWM cycle
@@ -52,7 +57,8 @@ def __init__(self, pi,
                        contrast_pwm=None, contrast=0.5,
                        cols=20, rows=4, dotsize=8,
                        charmap='A02',
-                       auto_linebreaks=True):
+                       auto_linebreaks=True,
+                       compat_mode=False):
         """
         Character LCD controller.
 
@@ -151,14 +157,16 @@ def __init__(self, pi,
         # Call superclass
         super(CharLCD, self).__init__(cols, rows, dotsize,
                                       charmap=charmap,
-                                      auto_linebreaks=auto_linebreaks)
+                                      auto_linebreaks=auto_linebreaks,
+                                      compat_mode=compat_mode)
 
         # Set backlight status
         if pin_backlight is not None:
             self.backlight_enabled = backlight_enabled
 
         # Set contrast
-        self.contrast = contrast
+        if pin_contrast is not None:
+            self.contrast = contrast
 
     def _init_connection(self):
         # Setup GPIO
@@ -299,6 +307,10 @@ def _send(self, value, mode):
         """Send the specified value to the display with automatic 4bit / 8bit
         selection. The rs_mode is either ``RS_DATA`` or ``RS_INSTRUCTION``."""
 
+        # Wait, if compatibility mode is enabled
+        if self.compat_mode:
+            self._wait()
+
         # Assemble the parameters sent to the pigpio script
         params = [mode]
         params.extend([(value >> i) & 0x01 for i in range(8)])
@@ -315,6 +327,10 @@ def _send(self, value, mode):
         # Switch on pigpio's exceptions
         pigpio.exceptions = True
 
+        # Record the time for the tail-end of the last send event
+        if self.compat_mode:
+            self.last_send_event = now()
+
     def _send_data(self, value):
         """Send data to the display. """
         self._send(value, c.RS_DATA)