221 lines
6.2 KiB
Python
221 lines
6.2 KiB
Python
# The MIT License (MIT)
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#
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# Copyright (c) 2017 Brent Rubell for Adafruit Industries
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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# THE SOFTWARE.
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"""
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`adafruit_CircuitPython_CharLCD`
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====================================================
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TODO(description)
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* Author(s): Brent Rubell
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"""
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import time
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import math
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import busio
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import digitalio
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from board import *
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# Commands
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LCD_CLEARDISPLAY = 0x01
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LCD_RETURNHOME = 0x02
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LCD_ENTRYMODESET = 0x04
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LCD_DISPLAYCONTROL = 0x08
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LCD_CURSORSHIFT = 0x10
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LCD_FUNCTIONSET = 0x20
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LCD_SETCGRAMADDR = 0x40
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LCD_SETDDRAMADDR = 0x80
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# Entry flags
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LCD_ENTRYRIGHT = 0x00
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LCD_ENTRYLEFT = 0x02
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LCD_ENTRYSHIFTINCREMENT = 0x01
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LCD_ENTRYSHIFTDECREMENT = 0x00
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# Control flags
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LCD_DISPLAYON = 0x04
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LCD_DISPLAYOFF = 0x00
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LCD_CURSORON = 0x02
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LCD_CURSOROFF = 0x00
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LCD_BLINKON = 0x01
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LCD_BLINKOFF = 0x00
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# Move flags
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LCD_DISPLAYMOVE = 0x08
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LCD_CURSORMOVE = 0x00
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LCD_MOVERIGHT = 0x04
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LCD_MOVELEFT = 0x00
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# Function set flags
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LCD_8BITMODE = 0x10
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LCD_4BITMODE = 0x00
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LCD_2LINE = 0x08
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LCD_1LINE = 0x00
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LCD_5x10DOTS = 0x04
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LCD_5x8DOTS = 0x00
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# Offset for up to 4 rows.
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LCD_ROW_OFFSETS = (0x00, 0x40, 0x14, 0x54)
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class cirpyth_char_lcd(object):
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"""Interface to the character lcd."""
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def __init__(self, rs, en, d4, d5, d6, d7, cols, lines):
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self.cols = cols
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self.lines = lines
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# save pin numbers
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self.rs = rs
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self.en = en
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self.d4 = d4
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self.d5 = d5
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self.d6 = d6
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self.d7 = d7
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# set all pins as outputs
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for pin in(rs, en, d4, d5, d6, d7):
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pin.switch_to_output()
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# initialize the display
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self.write8(0x33)
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self.write8(0x32)
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# init. display control
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self.displaycontrol = LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKOFF
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# init display function
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self.displayfunction = LCD_4BITMODE | LCD_1LINE | LCD_2LINE | LCD_5x8DOTS
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# init display mode
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self.displaymode = LCD_ENTRYLEFT | LCD_ENTRYSHIFTDECREMENT
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# write to display control
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self.write8(LCD_DISPLAYCONTROL | self.displaycontrol)
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# write displayfunction
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self.write8(LCD_FUNCTIONSET | self.displayfunction)
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# set the entry mode
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self.write8(LCD_ENTRYMODESET | self.displaymode)
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self.clear()
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def home(self):
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self.write8(LCD_RETURNHOME)
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time.sleep(0.003)
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def clear(self):
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self.write8(LCD_CLEARDISPLAY)
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time.sleep(0.003)
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def show_cursor(self, show):
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if show:
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self.displaycontrol |= LCD_CURSORON
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else:
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self.displaycontrol &= ~LCD_DISPLAYON
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self.write8(LCD_DISPLAYCONTROL | self.displaycontrol)
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def set_cursor(self, col, row):
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# move cursor to explicit column/row position
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# Clamp row to the last row of the display
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if row > self.lines:
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row = self.lines - 1
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# Set location
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self.write8(LCD_SETDDRAMADDR | (col + LCD_ROW_OFFSETS[row]))
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def blink(self, blink):
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if blink:
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self.displaycontrol |= LCD_BLINKON
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else:
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self.displaycontrol &= ~LCD_BLINKON
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self.write8(LCD_DISPLAYCONTROL | self.displaycontrol)
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def move_left(self):
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self.write8(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVELEFT)
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def move_right(self):
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self.write8(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVERIGHT)
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def set_left_to_right(self):
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self.displaymode |= LCD_ENTRYLEFT
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self.write8(LCD_ENTRYMODESET | self.displaymode)
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def set_left_to_right(self):
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self.displaymode |= LCD_ENTRYLEFT
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self.write8(LCD_ENTRYMODESET | self.displaymode)
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def enable_display(self, enable):
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"""Enable or disable the display. Set enable to True to enable."""
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if enable:
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self.displaycontrol |= LCD_DISPLAYON
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else:
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self.displaycontrol &= ~LCD_DISPLAYON
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self.write8(LCD_DISPLAYCONTROL | self.displaycontrol)
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def autoscroll(self, autoscroll):
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if autoscroll:
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self.displaymode |= LCD_ENTRYSHIFTINCREMENT
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else:
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self.displaymode &= ~LCD_ENTRYSHIFTINCREMENT
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self.write8(LCD_ENTRYMODESET | self.displaymode)
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# write8 function ported
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# ASSUMES ALL PINS ARE OUTPUT
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def write8(self,value, char_mode = False):
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# one ms delay to prevent writing too quickly.
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time.sleep(0.001)
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# set character/data bit. (charmode = False)
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self.rs.value = char_mode
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# WRITE upper 4 bits
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self.d4.value = ((value >> 4) & 1) > 0
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self.d5.value = ((value >> 5) & 1) > 0
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self.d6.value = ((value >> 6) & 1) > 0
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self.d7.value = ((value >> 7) & 1) > 0
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# send command
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self.pulse_enable()
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# WRITE lower 4 bits
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self.d4.value = (value & 1) > 0
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self.d5.value = ((value >> 1) & 1) > 0
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self.d6.value = ((value >> 2) & 1) > 0
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self.d7.value = ((value >> 3) & 1) > 0
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self.pulse_enable()
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# pulse the clock en line on, off to send cmd
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def pulse_enable(self):
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self.en.value = False
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# 1microsec pause
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time.sleep(0.0000001)
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self.en.value = True
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time.sleep(0.0000001)
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self.en.value = False
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time.sleep(0.0000001)
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# write text to display
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def message(self, text):
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line = 0
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# iterate thru each char
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for char in text:
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# if character is \n, go to next line
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if char == '\n':
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line += 1
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# move to left/right depending on text direction
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col = 0 if self.displaymode & LCD_ENTRYLEFT > 0 else self.cols-1
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self.set_cursor(col, line)
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# Write character to display
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else:
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self.write8(ord(char), True)
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