lcd_dog_m_spi

control for DOG-M (ST7036 based) LCD's

Author Richard Zengerink, Copyright © 2008, all rights reserved
Adapted-by
Compiler =2.4

Description

   Simple interface for DOG-M (st7036) alphanumeric LCD screens.
   Screens can range from 1x8  (1 lines, 8 chars), 2x16 and 3x16.
   Uses spi interface SI (data line), CLK (clock) RS (register select) and
   if necesery CSB (chip select) (total 4 PIC pins max.).
   Expects: - 1 pin for data: 'lcd_data'
            - 1 pin for clock: 'lcd_clk'
            - 1 pin for register/data select: 'lcd_rs'
            - 1 pin for Chip Select 'lcd_csb'  (if necesery, or CSB to gnd on lcd)
            - 1 var bit named not_connected to assign to lcd_csb if this pin
              is connected to ground.
   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 3 lines
         const byte LCD_CHARS    = 16             -- 8, or 16 chars per line
      and variables (aliases):
         var   bit not_connected
         var   bit  lcd_data      is  pin_A0      -- 1 data pin
         var   bit  lcd_clk       is  pin_A1      -- 1 data pin
         var   bit  lcd_rs        is  pin_A2      -- 1 data pin
         var   bit  lcd_csb       is  pin_A3      -- 1 data pin
     or if csb is connected to gnd:
         var   bit  lcd_csb       is  not_connected
.
   2. Include this library.
   and somewhere before actually using the lcd:
   3. Set the chosen LCD data and control pins to output:
         portA_low_direction = all_output  (in above case this is OK)
    OR assign each pin seperatly (when not every pin is on the same port):
         pin_A0_direction    = output      (each pin separately assigned)
         pin_A1_direction    = output
         pin_b0_direction    = output
         pin_b1_direction    = output
   4. Call lcd_init() to initialize the lcd controller.
   Above is an example for a 2x16 LCD:
.
   Available functions for application programs:
.
     _lcd_write()                     ends byte from value to
                                            register of the lcd  and
                                            shift cursor position 1 right
.
     _lcd_write_data()                write data to lcd using
                                            _lcd_write() lcd_rs high
.
     _lcd_write_data()                write command to lcd using
                                            _lcd_write() lcd_rs low
.
     lcd_init()                             initialize the LCD controller


Dependencies


Summary

Global variables/contants

Procedures

Private

Functions


API details

Global variables/contants

Procedures

  • lcd_init()

    Initialize display in 1 and 2 or 3 line, display on, no cursor shown an cursor
    moves to the right.
    
    

Private

Functions


Related samples

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