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LCD&pic18F452 setup

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Silver

Joined: 10 Jun 2005
Posts: 4
Location: Italy

LCD&pic18F452 setup

Posted: Tue Jun 14, 2005 2:02 am

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Can you help me to set up my pic18F452 in order to write on LCD display?My electric connections are:

Quote:

LCD Pic18F452
D0 D0
D1 D1
D2 D2
D3 D3
RS D4
RW D5
En A5

How can I modify the pin map structure of LCD.C to match this configuration?
Thank you

Guest


Posted: Tue Jun 14, 2005 4:26 am

LCD PIC18F452 DB4 RD4 DB5 RD5 DB6 RD6 DB7 RD7 LCD_EN RD0 RW RD2 RS RD1 with this pin assignment u can use the posted code by chingB at http://ccsinfo.com/forum/viewtopic.php?t=23234&sid=53884f7160ba0e1a4696d801fbce3906

PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Tue Jun 14, 2005 2:11 pm

Reply with quote

Quote:

Can you help me to set up my pic18F452 in order to write on LCD
display ? My electric connections are:
LCD Pic18F452

D0 D0
D1 D1
D2 D2
D3 D3
RS D4
RW D5
En A5

How can I modify the pin map structure of LCD.C to match this configuration?

To modify Mark's LCD driver for your pin map, you need to make
the changes shown below. Here is the link to Mark's driver:
http://www.ccsinfo.com/forum/viewtopic.php?t=20182

You need to use the following lcd_pin_map structure:

Code:

struct lcd_pin_map
{
int unusedA0_A4 : 5; // Pins A0-A4 are not used
BOOLEAN enable : 1; // Pin A5 = LCD Enable
int unusedA6_A7 : 2; // Pins A6,A7 are not used
int unusedB; // Port B is not used
int unusedC; // Port C is not used
int data : 4; // Pins D0-D3 = LCD Data (LCD pins DB4-DB7)
BOOLEAN rs : 1; // Pin D4 = LCD rs
BOOLEAN rw : 1; // Pin D5 = LCD rw
int unusedD : 2; // Pins D6,D7 are not used
} lcd;

The TRIS map must also be changed to the following:

Code:

struct lcd_tris_map
{
int unusedA0_A4 : 5; // Pins A0-A4 are not used
BOOLEAN enable : 1; // Pin A5 = LCD Enable
int unusedA6_A7 : 2; // Pins A6,A7 are not used
int unusedB; // Port B is not used
int unusedC; // Port C is not used
int data : 4; // Pins D0-D3 = LCD data (LCD pins DB4-DB7)
BOOLEAN rs : 1; // Pin D4 = LCD rs
BOOLEAN rw : 1; // Pin D5 = LCD rw
int unusedD : 2; // Pins D6-D7 are not used
} lcdtris;

The set_tris_lcd() macro must be changed to this:

Code:

#define set_tris_lcd(x) lcdtris.data = (x); \
lcdtris.rs = 0; \
lcdtris.rw = 0; \
lcdtris.enable = 0;

Important Note:
When you operate the LCD in 4-bit data bus mode, it's the upper 4 bits
of the LCD data bus that are used -- pins DB4 to DB7. So you must
connect the LCD data pins to the PIC as follows:

Code:

LCD pin PIC pin
DB4 D0
DB5 D1
DB6 D2
DB7 D3

Silver

Joined: 10 Jun 2005
Posts: 4
Location: Italy


Posted: Wed Jun 15, 2005 10:17 am

Thank you for the code!!! Now my lcd works properly

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