diff options
Diffstat (limited to 'bin/source/hardware_driver.py')
| -rw-r--r-- | bin/source/hardware_driver.py | 71 |
1 files changed, 0 insertions, 71 deletions
diff --git a/bin/source/hardware_driver.py b/bin/source/hardware_driver.py deleted file mode 100644 index 7d48e69..0000000 --- a/bin/source/hardware_driver.py +++ /dev/null | |||
| @@ -1,71 +0,0 @@ | |||
| 1 | from smbus import SMBus | ||
| 2 | from time import sleep | ||
| 3 | |||
| 4 | ALIGN_FUNC = { | ||
| 5 | 'left': 'ljust', | ||
| 6 | 'right': 'rjust', | ||
| 7 | 'center': 'center'} | ||
| 8 | CLEAR_DISPLAY = 0x01 | ||
| 9 | ENABLE_BIT = 0b00000100 | ||
| 10 | LINES = { | ||
| 11 | 1: 0x80, | ||
| 12 | 2: 0xC0, | ||
| 13 | 3: 0x94, | ||
| 14 | 4: 0xD4} | ||
| 15 | |||
| 16 | LCD_BACKLIGHT = 0x08 | ||
| 17 | LCD_NOBACKLIGHT = 0x00 | ||
| 18 | |||
| 19 | class LCD(object): | ||
| 20 | |||
| 21 | def __init__(self, address=0x27, bus=1, width=20, rows=4, backlight=True): | ||
| 22 | self.address = address | ||
| 23 | self.bus = SMBus(bus) | ||
| 24 | self.delay = 0.0005 | ||
| 25 | self.rows = rows | ||
| 26 | self.width = width | ||
| 27 | self.backlight_status = backlight | ||
| 28 | |||
| 29 | self.write(0x33) | ||
| 30 | self.write(0x32) | ||
| 31 | self.write(0x06) | ||
| 32 | self.write(0x0C) | ||
| 33 | self.write(0x28) | ||
| 34 | self.write(CLEAR_DISPLAY) | ||
| 35 | sleep(self.delay) | ||
| 36 | |||
| 37 | def _write_byte(self, byte): | ||
| 38 | self.bus.write_byte(self.address, byte) | ||
| 39 | self.bus.write_byte(self.address, (byte | ENABLE_BIT)) | ||
| 40 | sleep(self.delay) | ||
| 41 | self.bus.write_byte(self.address,(byte & ~ENABLE_BIT)) | ||
| 42 | sleep(self.delay) | ||
| 43 | |||
| 44 | def write(self, byte, mode=0): | ||
| 45 | backlight_mode = LCD_BACKLIGHT if self.backlight_status else LCD_NOBACKLIGHT | ||
| 46 | self._write_byte(mode | (byte & 0xF0) | backlight_mode) | ||
| 47 | self._write_byte(mode | ((byte << 4) & 0xF0) | backlight_mode) | ||
| 48 | |||
| 49 | def text(self, text, line, align='left'): | ||
| 50 | self.write(LINES.get(line, LINES[1])) | ||
| 51 | text, other_lines = self.get_text_line(text) | ||
| 52 | text = getattr(text, ALIGN_FUNC.get(align, 'ljust'))(self.width) | ||
| 53 | for char in text: | ||
| 54 | self.write(ord(char), mode=1) | ||
| 55 | if other_lines and line <= self.rows - 1: | ||
| 56 | self.text(other_lines, line + 1, align=align) | ||
| 57 | |||
| 58 | def backlight(self, turn_on=True): | ||
| 59 | self.backlight_status = turn_on | ||
| 60 | self.write(0) | ||
| 61 | |||
| 62 | def get_text_line(self, text): | ||
| 63 | line_break = self.width | ||
| 64 | if len(text) > self.width: | ||
| 65 | line_break = text[:self.width + 1].rfind(' ') | ||
| 66 | if line_break < 0: | ||
| 67 | line_break = self.width | ||
| 68 | return text[:line_break], text[line_break:].strip() | ||
| 69 | |||
| 70 | def clear(self): | ||
| 71 | self.write(CLEAR_DISPLAY) | ||
