Author | Rob Hamerling, Copyright (c) 2008..2009, all rights reserved. |
Adapted-by | Eur van Andel, Joep Suijs (refactoring),Richard Zengerink (lcd_init) |
Compiler | >=2.4g |
Port interface for HD44780 compatible alphanumeric LCD screens. Uses 8 bit wide datapath + 2 handshake lines (total 10 PIC pins). Expects: - 2 pins for handshake: 'lcd_rs' and 'lcd_en' - 1 complete port for data: 'lcd_dataport' or - 2 pins for handshake: 'lcd_rs' and 'lcd_en' - 8 lines for data: 'lcd_d0' .. 'lcd_d7' note: a 'port nibble' - the lower or higher 4 bits of a port - give faster and more compact code then random selected data lines. . Directions for use of this library in application programs (in this sequence): 1. Declare the following constants: const byte LCD_ROWS = 2 -- 1, 2 or 4 lines const byte LCD_CHARS = 16 -- 8, 16 or 20 chars per line and variables (aliases): var bit lcd_rs is pin_D2 -- cmd/data select var bit lcd_en is pin_D3 -- trigger and variables (aliases): var byte lcd_dataport is portF -- 8 data pins or var byte lcd_dataport_low is portD_high -- 4 low order data pins var byte lcd_dataport_high is portC_high -- 4 high order data pins or var bit lcd_d0 is pin_D0 -- databit d0 pin var bit lcd_d1 is pin_D1 -- databit d1 pin var bit lcd_d2 is pin_C6 -- databit d2 pin var bit lcd_d3 is pin_C7 -- databit d3 pin var bit lcd_d4 is pin_B0 -- databit d4 pin var bit lcd_d5 is pin_B1 -- databit d5 pin var bit lcd_d6 is pin_C0 -- databit d6 pin var bit lcd_d7 is pin_C2 -- databit d7 pin . 2. Set the chosen LCD handshake pins to output: pin_D2_direction = output pin_D3_direction = output and the data port to output: portF_direction = ALL_OUTPUT or 2 half data ports to output: portD_high_direction = ALL_OUTPUT portC_high_direction = ALL_OUTPUT or 8 individual pins to outout pin_D0_direction = output -- set data pin as output pin_D1_direction = output -- set data pin as output pin_C6_direction = output -- set data pin as output pin_C7_direction = output -- set data pin as output pin_B0_direction = output -- set data pin as output pin_B1_direction = output -- set data pin as output pin_C0_direction = output -- set data pin as output pin_C2_direction = output -- set data pin as output . 3. Include this library. . 4. Call lcd_init() to initialize the lcd controller. . Above is an example for a 2x16 LCD. . See hd_44780_common for the LCD API.
lcd_init()
Initialise the LCD controller and API
_lcd_write_data(byte in value)
Sends data byte into LCD
__lcd_write( byte in value )
Sends byte into the LCD (this procedure is only used inside this file).
_lcd_write_command(byte in value)
Sends command byte into LCD For slow commands an extra delay should be added
16f727 | 16f727_lcd_hd44780_8_1.jal |
16f727 | 16f727_lcd_hd44780_8_4.jal |
16f877a | 16f877a_lcd_hd44780_8_4.jal |
16f877a | 16f877a_lcd_hd44780_8_1.jal |
16f887 | 16f887_lcd_hd44780_8_1.jal |
16f887 | 16f887_lcd_hd44780_8_4.jal |
18f4685 | 18f4685_lcd_hd44780_8_4.jal |
18f4685 | 18f4685_lcd_hd44780_8_1.jal |
18f6310 | 18f6310_lcd_hd44780_8_1.jal |
18f6310 | 18f6310_lcd_hd44780_8_8.jal |
18f6310 | 18f6310_lcd_hd44780_8_4.jal |