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Best way of splitting LCD pins between ports?

 
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doug_h



Joined: 26 Feb 2004
Posts: 11

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Best way of splitting LCD pins between ports?
PostPosted: Mon Mar 29, 2004 10:01 am     Reply with quote
Hi all,

Quick qn., the LCD driver that ships with PICC uses a contiguous port to control the display. The code maps a struct over the the port like this:

Code:
// As defined in the following structure the pin connection is as follows:
//      PORT_D_PIN   LCD_Fn   LCD_PIN#
//         D0       Enable      6
//           D1       RS         4
//           D2       R/W         5
//           D4       DB4         11
//           D5       DB5         12
//           D6       DB6         13
//           D7       DB7         14
//
//   LCD pins DB0-DB3 are not used and PORT_D_PIN 3 is not used.


struct lcd_pin_map {                // This structure is overlayed
           BOOLEAN enable;         // on to the I/O port to gain
           BOOLEAN rs;              // access to the LCD pins.
           BOOLEAN rw;              // The bits are allocated from
           BOOLEAN unused;          // low order up.  ENABLE will
           int     data : 4;        // be pin D0.
        } lcd;


#byte lcd = 8                  // This puts the entire structure
                           // on to port D (at address 8)
#define set_tris_lcd(x) set_tris_d(x)

#define lcd_type 2           // 0=5x7, 1=5x10, 2=2 lines
#define lcd_line_two 0x40    // LCD RAM address for the second line

BYTE const LCD_INIT_STRING[4] = {0x20 | (lcd_type << 2), 0xc, 1, 6};
                             // These bytes need to be sent to the LCD
                             // to start it up.


                             // The following are used for setting
                             // the I/O port direction register.

struct lcd_pin_map const LCD_WRITE = {0,0,0,0,0}; // For write mode all pins are out
struct lcd_pin_map const LCD_READ = {0,0,0,0,15}; // For read mode data pins are in

This all works fine, but I don't have an entire contiguous port available on my design, I need to split the pins between two ports. What is the best way to accomplish this?

Thanks.
GDetienne



Joined: 20 Sep 2003
Posts: 47
Location: Brussel - Belgium

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LCD drivers
PostPosted: Mon Mar 29, 2004 10:19 am     Reply with quote
Try the driver found at this addresse : http://www.vermontficks.org/lcdd.htm
It work fine and is easy to adapt at your PIC configuration.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon Mar 29, 2004 12:39 pm     Reply with quote
Also see this post by Mark:
http://www.ccsinfo.com/forum/viewtopic.php?t=17323
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