Zilog750
Joined: 19 Oct 2013
Posts: 6
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| LCD05 i2c LCD 4x20 |
 Posted: Fri Dec 06, 2013 1:39 pm |
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Hi all,
I'm using this LCD
http://www.robot-electronics.co.uk/htm/Lcd05tech.htm
And using code above. I think I've a data type conversion problem (float to string array). In this case I want to show max_temp on the LCD. MESSAGE_LCD() function works properly. Any suggestions ?
Code
| Code: | #include <16F877.h>
#DEVICE PASS_STRINGS=IN_RAM
#include <string.h>
#fuses XT,NOWDT,NOPROTECT,NOLVP,BROWNOUT
#use delay(clock=4000000)
#use standard_io(C)
#use standard_io(B)
#use standard_io(A)
float max_temp;
char txt[20];
#include "LCD05_i2c.c"
void main()
{
clear_lcd();
message_lcd();
show_cursor();
max_temp = 25.16;
while(1)
{
light_lcd();
delay_ms (500);
clear_lcd();
text_on_lcd ((char)max_temp);
}
} |
And LCD driver
| Code: | /************************************************************/
/* G L O B A L V A R I A B L E S */
/************************************************************/
int LCD03_ID = 0xC6; // I2C addrres for LCD03
char text[20];
char texto[20];
int i; // text buffer pos
int n; // Char number
short int light; // Turn ON-Off display light
int command; // LCD Command
int row; // Row Posición
int line; // Line Position
int contrast;
/************************************************************/
/* F U N C T I O N S */
/************************************************************/
void cursor_lcd(LCD03_ID, line, row);
void write_lcd(byte LCD03_ID);
void command_lcd ( byte LCD03_ID, byte command );
void light_lcd ();
void clear_lcd ();
void carrier_return ();
void text_hello ();
void text_on_lcd();
void message_lcd();
void text_lcd();
/******************** FUNCTION write TEXT LCD **************************/
void write_lcd(byte LCD03_ID)
{
for ( i=0; i<n; i++) {
i2c_start(); // Start i2c communication ...
i2c_write(LCD03_ID); //...with LCD03 address ...
i2c_write(0); //...poiting to zero pos on the LCD03 register
i2c_write(text[i]); //...write char into i position on text[i]
i2c_stop (); // ending transmission
delay_ms(10);
}
}
/********************* FUNTCION write command LCD **************************/
void command_lcd ( byte LCD03_ID, byte command )
{
i2c_start(); // Start i2c communication ...
i2c_write(LCD03_ID); //...with LCD03 address .....
i2c_write(0); //...poiting to zero pos on the LCD03 register
i2c_write(command); //...write action
i2c_stop (); // ending transmission
}
/***************** FUNCTION TURN ON-OFF display light ************************/
void light_lcd ()
{
light=light+1; // Swap light state
if (light==1) command=19; // turn on light command
else command=20; // turn off light command
command_lcd(LCD03_ID, command); // Send action to LCD
delay_ms(300);
}
/********************** FUNCTION clear DISPLAY ********************************/
void clear_lcd ()
{
command=12; // clear display command
command_lcd(LCD03_ID, command); // Send action to LCD
delay_ms(150);
}
/******************* FUNCTION clear previou char *************************/
void clear_character ()
{
command=8; // clear display command
command_lcd(LCD03_ID, command); // Send action to LCD
delay_ms(300);
}
/*********************** FUNCTION HIDE CURSOR *******************************/
void clear_cursor ()
{
command=4; // Hide cursor command
command_lcd(LCD03_ID, command); // send action to LCD
delay_ms(150);
}
/*********************** FUNCTION SHOW CURSOR *******************************/
void show_cursor ()
{
command=6; // Show cursor command
command_lcd(LCD03_ID, command); // Send action to LCD
delay_ms(150);
}
/********************** FUNCTION CARRIER RETURN ******************************/
void carrier_return ()
{
command=13; // LCD Carrier Return command
command_lcd(LCD03_ID, command); // Send action to LCD
delay_ms(300);
}
/********************* FUNCTION CONTRAST *********************************/
void lcd_contrast (contrast)
{
i2c_start(); // Start i2c comunication ...
i2c_write(LCD03_ID); // ...with LCD03 address...
i2c_write(0); // ... pointing into zero register position on LCD03
i2c_write(30); // cursor position ...
i2c_write(contrast); // ... and row
i2c_stop (); // End transmission
}
/********************* FUNCTION LCD_TYPE *********************************/
void lcd_type (void)
{
i2c_start(); // Start i2c comunication ...
i2c_write(LCD03_ID); // ...with LCD03 address...
i2c_write(0); // ... pointing into zero register position on LCD03
i2c_write(24); // cursor position ...
i2c_write(3); // ... and row
i2c_stop (); // End transmission
}
/********************* FUNCTION write TEXT ********************************/
void text_hello (line, row)
{
strcpy (text, "Hello"); // First Line Text
n=strlen(text); // Getting number of chars
cursor_lcd (LCD03_ID, line, row); // Send cursor position
write_lcd (LCD03_ID); // Send first line text
}
/************************* FUNCTION TEXT_ON_LCD*******************************/
void text_on_lcd (text)
{
strcpy (texto, text); // First Line tex
n=strlen(texto); // Get number of chars
row=((20-n)/2)+1; // Centered Text position
line=1; // ... in the first line
cursor_lcd (LCD03_ID, line, row); // Send cursor position
write_lcd (LCD03_ID); // Send text on the first line
}
/********************* FUNCTION MESSAGE *********************************/
void message_lcd()
{
strcpy (text, "This is a"); // First Line text
n=strlen(text); // Get number of chars
row=((20-n)/2)+1; // Centered Text position
line=1; // ... in the first line
cursor_lcd (LCD03_ID, line, row); // Send cursor position
write_lcd (LCD03_ID); // Send text on the first line
strcpy (text, "welcome message"); // second line text
n=strlen(text); // Get number of chars
row=((20-n)/2)+1; // Centered Text position
line=2; // ... on the second line
cursor_lcd (LCD03_ID, line, row); // Send cursor position
write_lcd (LCD03_ID); // Send text on the second line
strcpy (text, "--------------------"); // on the fourth line
n=strlen(text); // Get number of chars
row=((20-n)/2)+1; // Centered Text position
line=3;
cursor_lcd(LCD03_ID, line, row); // Send cursor position
write_lcd (LCD03_ID); // Send text on the fourth line
strcpy (text, "PIC (c)"); // on the fourth line
n=strlen(text); // Get number of chars
row=((20-n)/2)+1; // Centered Text position
line=4;
cursor_lcd(LCD03_ID, line, row); // Send cursor position
write_lcd (LCD03_ID); // Send text on the fourth line
}
/********************** FUNCTION CURSOR POSITION *****************************/
void cursor_lcd (byte LCD03_ID, byte line, byte row)
{
i2c_start(); // Start i2c comunication ...
i2c_write(LCD03_ID); // ...with LCD03 address...
i2c_write(0); // ... pointing into zero register position on LCD03
i2c_write(3); // cursor position ...
i2c_write(line); // ...on line...
i2c_write(row); // ... and row
i2c_stop (); // End transmission
} |
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