lcd.rar_16x4 lcd_Imagecraft_atmega8535_lcd 16x4

// ************************************************************** // *** LCD Driver V1.0 *** // *** Written By P. Fletcher-Jones 9/5/01 *** // *** Last MOD 9/5/01 *** // *** Compiled with ImageCraft C compiler Version 6.21E *** // ************************************************************** #include "LCD.h" #include <iom8515v.h> #include <macros.h> // ***** Define I/O pins ***** // #define BIT7 0x80 #define BIT6 0x40 #define BIT5 0x20 #define BIT4 0x10 #define BIT3 0x08 #define BIT2 0x04 #define BIT1 0x02 #define BIT0 0x01 #if 0 // *** Set port for LCD Data Bus 8 bit mode *** // #define LCD_OP_PORT PORTA #define LCD_IP_PORT PINA #define LCD_DIR_PORT DDRA // *** Set LCD Enable Port and Bit values *** // #define LCD_EN_PORT PORTC #define EN_BIT BIT7 // *** Set LCD Register Select Port and Bit values *** // #define LCD_RS_PORT PORTC #define RS_BIT BIT6 // *** Set LCD Read/Write Port and Bit values *** // #define LCD_RW_PORT PORTC #define RW_BIT BIT5 #endif volatile unsigned char *LCD_EN_PORT = &PORTC; volatile unsigned char *LCD_DIR_PORT = &DDRA; volatile unsigned char *LCD_IP_PORT = &PINA; volatile unsigned char *LCD_OP_PORT = &PORTA; volatile unsigned char *LCD_RS_PORT = &PORTC; volatile unsigned char *LCD_RW_PORT = &PORTC; char LCD_EN_BIT = BIT(7); char LCD_RS_BIT = BIT(6); char LCD_RW_BIT = BIT(5); #define SET_LCD_E *LCD_EN_PORT |= LCD_EN_BIT #define CLEAR_LCD_E *LCD_EN_PORT &= ~LCD_EN_BIT #define SET_LCD_DATA *LCD_RS_PORT |= LCD_RS_BIT #define SET_LCD_CMD *LCD_RS_PORT &= ~LCD_RS_BIT #define SET_LCD_READ *LCD_RW_PORT |= LCD_RW_BIT #define SET_LCD_WRITE *LCD_RW_PORT &= ~LCD_RW_BIT #define LCD_ON 0x0C #define LCD_CURS_ON 0x0D #define LCD_OFF 0x08 #define LCD_HOME 0x02 #define LCD_CLEAR 0x01 #define LCD_NEW_LINE 0xC0 #define LCD_FUNCTION_SET 0x38 #define LCD_MODE_SET 0x06 //*****************************************************// // This routine will return the busy flag from the LCD // //*****************************************************// unsigned char LCD_Busy ( void ) { unsigned char temp; CLEAR_LCD_E; // Disable LCD *LCD_DIR_PORT = 0x00; // Make I/O Port input SET_LCD_READ; // Set LCD to READ SET_LCD_CMD; // Set LCD to command SET_LCD_E; // asm("nop"); temp = *LCD_IP_PORT; // Load data from port CLEAR_LCD_E; // Disable LCD return temp; // return busy flag } // ********************************************** // // *** Write a control instruction to the LCD *** // // ********************************************** // void LCD_WriteControl (unsigned char CMD) { while (LCD_Busy()& 0X80); // Test if LCD busy CLEAR_LCD_E; // Disable LCD SET_LCD_WRITE ; // Set LCD to write SET_LCD_CMD; // Set LCD to command *LCD_DIR_PORT = 0xFF; // LCD port output *LCD_OP_PORT = CMD; // Load data to port SET_LCD_E; // Write data to LCD asm("nop"); CLEAR_LCD_E; // Disable LCD } // ***************************************** // // *** Write one byte of data to the LCD *** // // ***************************************** // void LCD_WriteData (unsigned char Data) { while (LCD_Busy() & 0X80); // Test if LCD Busy CLEAR_LCD_E; // Disable LCD SET_LCD_WRITE ; // Set LCD to write SET_LCD_DATA; // Set LCD to data *LCD_DIR_PORT = 0xFF; // LCD port output *LCD_OP_PORT = Data; // Load data to port SET_LCD_E; // Write data to LCD asm("nop"); CLEAR_LCD_E; // Disable LCD } // ********************************* // // *** Initialize the LCD driver *** // // ********************************* // void Init_LCD(void) { LCD_WriteControl (LCD_FUNCTION_SET); LCD_WriteControl (LCD_OFF); LCD_WriteControl (LCD_CLEAR); LCD_WriteControl (LCD_MODE_SET); LCD_WriteControl (LCD_ON); LCD_WriteControl (LCD_HOME); } // ************************************************ // // *** Clear the LCD screen (also homes cursor) *** // // ************************************************ // void LCD_Clear(void) { LCD_WriteControl(0x01); } // *********************************************** // // *** Position the LCD cursor at row 1, col 1 *** // // *********************************************** // void LCD_Home(void) { LCD_WriteControl(0x02); } // ****************************************************************** // // *** Display a single character, at the current cursor location *** // // ****************************************************************** // void LCD_DisplayCharacter (char Char) { LCD_WriteData (Char); } // ********************************************************************* // // *** Display a string at the specified row and column, using FLASH *** // // ********************************************************************* // void LCD_DisplayString_F (char row, char column ,const unsigned char *string) { LCD_Cursor (row, column); while (*string) LCD_DisplayCharacter (*string++); } // ******************************************************************* // // *** Display a string at the specified row and column, using RAM *** // // ******************************************************************* // void LCD_DisplayString (char row, char column ,unsigned char *string) { LCD_Cursor (row, column); while (*string) LCD_DisplayCharacter (*string++); } // *************************************************** // // *** Position the LCD cursor at "row", "column". *** // // *************************************************** // void LCD_Cursor (char row, char column) { switch (row) { case 1: LCD_WriteControl (0x80 + column - 1); break; case 2: LCD_WriteControl (0xc0 + column - 1); break; case 3: LCD_WriteControl (0x94 + column - 1); break; case 4: LCD_WriteControl (0xd4 + column - 1); break; default: break; } } // ************************** // // *** Turn the cursor on *** // // ************************** // void LCD_Cursor_On (void) { LCD_WriteControl (LCD_CURS_ON); } // *************************** // // *** Turn the cursor off *** // // *************************** // void LCD_Cursor_Off (void) { LCD_WriteControl (LCD_ON); } // ******************** // // *** Turn Off LCD *** // // ******************** // void LCD_Display_Off (void) { LCD_WriteControl(LCD_OFF); } // ******************* // // *** Turn On LCD *** // // ******************* // void LCD_Display_On (void) { LCD_WriteControl(LCD_ON); } void delay(int k) { int i; for (i=0;i<800*k;i++) i++; }