lcd_2015

// ------------------------------  Pinos interface LCD --------------
#define	LCD_RS 		  RB4						// LCD_RS PINO4
#define LCD_EN 		  RB5						// LCD_EN PINO6
#define LCD_DATA 	  PORTB  					// Define a porta de dados a ser usada, bits 0,1,2,3
#define	LCD_STROBE() ((LCD_EN = 1),(LCD_EN=0))
// ------------------------------------------------------------------
void lcd_write(char c, char d)					// Escreve um byte no LCD em 4 bit bus mode
{												// d bit RS 0 = cmd  1 = dado
	__delay_us(40);
	LCD_DATA = ( ( c >> 4 ) & 0x0F | d  );  	// Envia MSb do byte
	LCD_STROBE();
	LCD_DATA = ( c & 0x0F | d );				// Envia LSb do byte
	LCD_STROBE();
}
// ------------------------------------------------------------------
void lcd_clear(void)							// Limpa LCD e vai para o home
{
	lcd_write(0x1,0x00);  		 				// 0x01 = clear 0x00 = cmd
	__delay_ms(2);								// Aguarde de 2 ms
}
// ------------------------------------------------------------------
void lcd_puts(const char * s)  					// Escreve uma string de chars no LCD
{												// É um sinalisador de pointer  *s s pointer
	while(*s)									// Enqunato houver
	lcd_write(*s++,0x10);  		 				// 0x10 = dado
}
// ------------------------------------------------------------------
void lcd_putch(char c)							// Escreve um character no LCD
{
	lcd_write( c,0x10 );   		 				// 0x10 dado
}
// ----------------------
void lcd_goto(char pos)							// Vai para uma posição especifica
{
	lcd_write(0x80+pos,0x00);   		 		// 0x80 = location pos = linha +  posição na linha
}
// ----------------------
void lcd_init()									// Initialisa o LCD - define 4 bit bus mode
{
	char init_value = 0x03;  					// Caracter especial de inicialização
	LCD_EN = 0;
	__delay_ms(15);								// Aguarde 15mSec após power on
	LCD_DATA	 = init_value;
	LCD_STROBE();
	__delay_ms(5);								// Aguarde 5 mSec
	LCD_STROBE();
	__delay_us(200);							// Aguarde 5 uSec
	LCD_STROBE();
	__delay_us(200);							// Aguarde 5 uSec
	lcd_write(0x28,0x00); 						// Bus 4 bit bus mode 2 linhas mode   0x00 = cmd
		// bit5 Function Set

		// bit4 DL: Interface data length control bit
		// bit4 = “High”, it means 8-bit bus mode with MPU.
		// bit4 = “Low”, it means 4-bit bus mode with MPU.
		//      When 4-bit bus mode, it needs to transfer 4-bit data twice.

		// bit3 N: Display line number control bit
		// bit3 = “Low”, 1-line display mode is set.
		// bit3 = “High”, 2-line display mode is set.

		// bit2 F: Display font type control bit
		// bit2 = “Low”, 5 ´8 dots format display mode is set.
		// bit2 = “High”, 5 ´11 dots format display mode.

	lcd_write(0x0C,0x00); 	// Display On, CURSOR OFF, Cursor Blink  // Alterei para + uma variavel no write
 		// bit3  Display ON/OFF Control

		// bit2 D: Display ON/OFF control bit
		// bit2 = “High”, entire display is turned on.
		// bit2 = “Low”, display is turned off, but display data remains in DDRAM.

		// bit1	C: Cursor ON/OFF control bit
		// bit1 = “High”, cursor is turned on.
		// bit1 = “Low”, cursor is disappeared in current display, but I/D register preserves its data.

		// bit0 B: Cursor Blink ON/OFF control bit
		// bit0 = “High”, cursor blink is on, which performs alternately between all the “High” data and
		// 			display characters at the cursor position.
		// bit0 = “Low”, blink is off.

	lcd_clear();			// Clear screen

	lcd_write(0x06,0x00); 	// Set entry Mode  // Alterei para + uma variavel no write
		//  bit1 = 2  Entry Mode Set

		//  bit1 I/D: Increment / decrement of DDRAM address (cursor or blink)
		//  bit1 = “High”  cursor/blink moves to right and DDRAM address is increased by 1.
		//  bit1 = “Low”  cursor/blink moves to left and DDRAM address is decreased by 1.

		//  bit0 SH: Shift of entire display
		//  bit0 If = “High” and DDRAM write operation, shift of entire display is performed according to I/D value
		//		(I/D = “High”: shift left, I/D = “Low”: shift right).
}