Prosta biblioteka do obsługi sterownika LCD HD44780 dla mikrokontrolerów PIC

Z braku dobrze działających i prostych w użyciu bibliotek postanowiłem napisać swoją, jak najprostszą w pisaniu i użyciu.

Poniżej umieściłem zestaw funkcji z biblioteki. Działa ona w 4-bitowym interfejsie z odczytem flagi BF. Można podpiąć RW wyświetlacza do masy i wtedy trzeba zastąpić funkcję busy opóźnieniem około 50us.

void BUS_set(unsigned char dataToSet){

    LCD_DATA4_LAT = (dataToSet & ( 1 << 0 )) >> 0;  

    LCD_DATA5_LAT = (dataToSet & ( 1 << 1 )) >> 1;   

    LCD_DATA6_LAT = (dataToSet & ( 1 << 2 )) >> 2;   

    LCD_DATA7_LAT = (dataToSet & ( 1 << 3 )) >> 3;   

}

void BUS_write(unsigned char dataToWrite){

LCD_RW_LAT = LOW;

LCD_E_LAT = HIGH;

BUS_set(dataToWrite >> 4);

LCD_E_LAT = LOW;

LCD_E_LAT = HIGH;

BUS_set(dataToWrite);

LCD_E_LAT = LOW;

while(LCD_busy());

}

void LCD_command(unsigned char commandToWrite){

LCD_RS_LAT = LOW;

BUS_write(commandToWrite);

}

void LCD_data(unsigned char dataToWrite)

{

LCD_RS_LAT = HIGH;

BUS_write(dataToWrite);

}

void LCD_text(char * text)

{

while(*text)

LCD_data(*text++);

}

void LCD_fills(unsigned char j)

{

while(j > 0){

LCD_data(0xFF);

j--;

}

}

void LCD_clear(void)

{

LCD_command(0x01);

delay(2);

}

void LCD_home(void)

{

LCD_command(0x02);

delay(2);

}

void LCD_pos(unsigned char row, unsigned char position)

{

    if(row == 0){

        LCD_command(0x80);

        while(position > 0){

            LCD_command(0x14);

            position--;

        }

    } else {

        LCD_command(0xC0);

        while(position > 0){

            LCD_command(0x14);

            position--;

        }

    }

}

void LCD_int(unsigned long  tmp){

char buffer[16]; 

sprintf(buffer,"%ld", tmp);

LCD_text(buffer);

}

void LCD_float(double  tmp){

char buffer[16]; 

sprintf(buffer,"%.3f", tmp);

LCD_text(buffer);

}

void LCD_initalize(void)

{

LCD_RW_DIR = OUTPUT;

LCD_E_DIR = OUTPUT;

LCD_RS_DIR = OUTPUT;

LCD_BUS_OUTPUT;

delay(15); 

LCD_RW_LAT = LOW;

LCD_RS_LAT = LOW;

LCD_E_LAT = HIGH;

for(unsigned char i = 0; i < 3; i++)

  {

  LCD_E_LAT = HIGH;

  BUS_set(0x03);

  LCD_E_LAT = LOW;

  delay(5);

  }

  LCD_E_LAT = HIGH;

  BUS_set(0x02);

  LCD_E_LAT = LOW;

  delay(1);

   LCD_command(40);

   LCD_command(1);

   delay(2);

   LCD_command(12);

   LCD_command(1);

   delay(5);

}

unsigned char LCD_busy(){

LCD_BUS_INPUT;

LCD_RW_LAT = HIGH;

LCD_RS_LAT = LOW;

unsigned char bf = LCD_DATA7_REA;

LCD_RW_LAT = LOW;

LCD_RS_LAT = LOW;

LCD_BUS_OUTPUT;

return bf;

}