LCD PORTD/16F877

[slahiri]

<font face="Courier New" size=-1>What do I need to change to make it to work on portD, as of now it is not working. This LCD has HD44780A00 controller.

LCD PIN OUT
1--GND
2--VCC
3--VEE--contrast
4--RS
5--R/W
6--E
7--14--DB0--DB7




// As defined in the following structure the pin connection is as follows:
// D0 enable
// D1 rs
// D2 rw
// D4 D4
// D5 D5
// D6 D6
// D7 D7
//
// LCD pins D0-D3 are not used and PIC D3 is not used.

// Un-comment the following define to use port B
// #define use_portb_lcd TRUE


struct lcd_pin_map { // This structure is overlayed
boolean enable; // on to an 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 B0.
} lcd;



#if defined(__PCH__)
#if defined use_portb_lcd
#byte lcd = 0xF81 // This puts the entire structure
#else
#byte lcd = 0xF83 // This puts the entire structure
#endif
#else
#if defined use_portb_lcd
#byte lcd = 6 // on to port B (at address 6)
#else
#byte lcd = 8 // on to port D (at address 8)
#endif
#endif

#if defined use_portb_lcd
#define set_tris_lcd(x) set_tris_b(x)
#else
#define set_tris_lcd(x) set_tris_d(x)
#endif



#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




byte lcd_read_byte() {
byte low,high;
set_tris_lcd(LCD_READ);
lcd.rw = 1;
delay_cycles(1);
lcd.enable = 1;
delay_cycles(1);
high = lcd.data;
lcd.enable = 0;
delay_cycles(1);
lcd.enable = 1;
delay_us(1);
low = lcd.data;
lcd.enable = 0;
set_tris_lcd(LCD_WRITE);
return( (high<<4) | low);
}


void lcd_send_nibble( byte n ) {
lcd.data = n;
delay_cycles(1);
lcd.enable = 1;
delay_us(2);
lcd.enable = 0;
}


void lcd_send_byte( byte address, byte n ) {

lcd.rs = 0;
while ( bit_test(lcd_read_byte(),7) ) ;
lcd.rs = address;
delay_cycles(1);
lcd.rw = 0;
delay_cycles(1);
lcd.enable = 0;
lcd_send_nibble(n >> 4);
lcd_send_nibble(n & 0xf);
}








</font>
___________________________
This message was ported from CCS's old forum
Original Post ID: 12303

[ISAAC AIYANYO]

:=<font face="Courier New" size=-1>What do I need to change to make it to work on portD, as of now it is not working. This LCD has HD44780A00 controller.
:=
:=LCD PIN OUT
:=1--GND
:=2--VCC
:=3--VEE--contrast
:=4--RS
:=5--R/W
:=6--E
:=7--14--DB0--DB7
:=
:=
:=
:=
:=// As defined in the following structure the pin connection is as follows:
:=// D0 enable
:=// D1 rs
:=// D2 rw
:=// D4 D4
:=// D5 D5
:=// D6 D6
:=// D7 D7
:=//
:=// LCD pins D0-D3 are not used and PIC D3 is not used.
:=
:=// Un-comment the following define to use port B
:=// #define use_portb_lcd TRUE
:=
:=
:=struct lcd_pin_map { // This structure is overlayed
:= boolean enable; // on to an 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 B0.
:= } lcd;
:=
:=
:=
:=#if defined(__PCH__)
:=#if defined use_portb_lcd
:= #byte lcd = 0xF81 // This puts the entire structure
:=#else
:= #byte lcd = 0xF83 // This puts the entire structure
:=#endif
:=#else
:=#if defined use_portb_lcd
:= #byte lcd = 6 // on to port B (at address 6)
:=#else
:= #byte lcd = 8 // on to port D (at address 8)
:=#endif
:=#endif
:=
:=#if defined use_portb_lcd
:= #define set_tris_lcd(x) set_tris_b(x)
:=#else
:= #define set_tris_lcd(x) set_tris_d(x)
:=#endif
:=
:=
:=
:=#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
:=
:=
:=
:=
:=byte lcd_read_byte() {
:= byte low,high;
:= set_tris_lcd(LCD_READ);
:= lcd.rw = 1;
:= delay_cycles(1);
:= lcd.enable = 1;
:= delay_cycles(1);
:= high = lcd.data;
:= lcd.enable = 0;
:= delay_cycles(1);
:= lcd.enable = 1;
:= delay_us(1);
:= low = lcd.data;
:= lcd.enable = 0;
:= set_tris_lcd(LCD_WRITE);
:= return( (high<<4) | low);
:=}
:=
:=
:=void lcd_send_nibble( byte n ) {
:= lcd.data = n;
:= delay_cycles(1);
:= lcd.enable = 1;
:= delay_us(2);
:= lcd.enable = 0;
:=}
:=
:=
:=void lcd_send_byte( byte address, byte n ) {
:=
:= lcd.rs = 0;
:= while ( bit_test(lcd_read_byte(),7) ) ;
:= lcd.rs = address;
:= delay_cycles(1);
:= lcd.rw = 0;
:= delay_cycles(1);
:= lcd.enable = 0;
:= lcd_send_nibble(n >> 4);
:= lcd_send_nibble(n & 0xf);
:=}
:=
:=
:=
:=
:=
:=
:=
:=
:=</font>
___________________________
This message was ported from CCS's old forum
Original Post ID: 144517132

[ISAAC AIYANYO]

I have got a similar problem using the same conections on portD of pic16f877
Did you ever get it working?

Isaac
___________________________
This message was ported from CCS's old forum
Original Post ID: 144517133