diff options
Diffstat (limited to 'bin')
| -rw-r--r-- | bin/i2c.py | 66 |
1 files changed, 42 insertions, 24 deletions
@@ -1,47 +1,65 @@ -import smbus2 as SMBus -import time +from smbus import SMBus +from time import sleep + +ALIGN_FUNC = {"left": "ljust", "right": "rjust", "center": "center"} +CLEAR_DISPLAY = 0x01 +ENABLE_BIT = 0b00000100 +LINES = {1: 0x80, 2: 0xC0, 3: 0x94, 4: 0xD4} LCD_BACKLIGHT = 0x08 LCD_NOBACKLIGHT = 0x00 -ENABLE_BIT = 0b00000100 -LINES = {1: 0x80, 2: 0xC0} -ALIGN_FUNC = {"left": "ljust", "right": "rjust", "center": "center"} -class LCD: +class LCD(object): def __init__(self, address=0x27, bus=1, width=20, rows=4, backlight=True): self.address = address self.bus = SMBus(bus) - self.width = width + self.delay = 0.0005 self.rows = rows + self.width = width self.backlight_status = backlight - self.delay = 0.0005 - for cmd in (0x33, 0x32, 0x06, 0x0C, 0x28, 0x01): - self.write(cmd) - time.sleep(self.delay) - - def write(self, byte, mode=0): - backlight = LCD_BACKLIGHT if self.backlight_status else LCD_NOBACKLIGHT - self._write_byte(mode | ((byte << 4) & 0xF0) | backlight) + self.write(0x33) + self.write(0x32) + self.write(0x06) + self.write(0x0C) + self.write(0x28) + self.write(CLEAR_DISPLAY) + sleep(self.delay) def _write_byte(self, byte): self.bus.write_byte(self.address, byte) self.bus.write_byte(self.address, (byte | ENABLE_BIT)) - time.sleep(self.delay) + sleep(self.delay) self.bus.write_byte(self.address, (byte & ~ENABLE_BIT)) - time.sleep(self.delay) + sleep(self.delay) - def display_text(self, text, line=1, align="left"): + def write(self, byte, mode=0): + backlight_mode = LCD_BACKLIGHT if self.backlight_status else LCD_NOBACKLIGHT + self._write_byte(mode | (byte & 0xF0) | backlight_mode) + self._write_byte(mode | ((byte << 4) & 0xF0) | backlight_mode) + + def text(self, text, line, align="left"): self.write(LINES.get(line, LINES[1])) - aligned_text = getattr(text, ALIGN_FUNC.get(align, "ljust"))(self.width) - for char in aligned_text: + text, other_lines = self.get_text_line(text) + text = getattr(text, ALIGN_FUNC.get(align, "ljust"))(self.width) + for char in text: self.write(ord(char), mode=1) + if other_lines and line <= self.rows - 1: + self.text(other_lines, line + 1, align=align) - def clear(self): - self.write(0x01) - - def set_backlight(self, turn_on=True): + def backlight(self, turn_on=True): self.backlight_status = turn_on self.write(0) + + def get_text_line(self, text): + line_break = self.width + if len(text) > self.width: + line_break = text[: self.width + 1].rfind(" ") + if line_break < 0: + line_break = self.width + return text[:line_break], text[line_break:].strip() + + def clear(self): + self.write(CLEAR_DISPLAY) |