?? tg_4bitlcd.c
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//===================================================================
// This file contains some basic LCD functions (4bit mode). =
// The R/W-pin of the LCD is permanently set to "write". =
// =
// Used MCU : Intel D87C51FA ( 256 Byte RAM, 8 KByte EPROM, =
// 3 Timer, UART, @ 11.0592 MHz ) =
// =
// Compiler commandline : sdcc program.c --stack-after-data =
// Compiler version SDCC V2.19Ba =
//===================================================================
//===================================================================
// Port-map of the MCU : =
// =
// P0_0 -> unused =
// P0_1 -> unused =
// P0_2 -> unused =
// P0_3 -> unused =
// P0_4 -> unused =
// P0_5 -> unused =
// P0_6 -> unused =
// P0_7 -> unused =
// =
// P1_0 -> unused =
// P1_1 -> unused =
// P1_2 -> unused =
// P1_3 -> unused =
// P1_4 -> unused =
// P1_5 -> unused =
// P1_6 -> unused =
// P1_7 -> unused =
// =
// P2_0 -> unused =
// P2_1 -> unused =
// P2_2 -> LCD RS =
// P2_3 -> LCD E =
// P2_4 -> LCD D4 =
// P2_5 -> LCD D5 =
// P2_6 -> LCD D6 =
// P2_7 -> LCD D7 =
// =
// P3_0 -> [RXD] unused =
// P3_1 -> [TXD] unused =
// P3_2 -> [INT0] unused =
// P3_3 -> [INT1] unused =
// P3_4 -> [T0] unused =
// P3_5 -> [T1] unused =
// P3_6 -> [WR] unused =
// P3_7 -> [RD] unused =
// =
//===================================================================
// INCLUDES =========================================================
#include <regc51fx.h> // Definitions of registers, SFRs and Bits
// END INCLUDES =====================================================
// DEFINES ==========================================================
#define LCD_DATA P2 // Dataport of LCD-Display (D4..D7)
#define LCD_RS P2_2 // Register Select of LCD-Display
#define LCD_E P2_3 // Enable of LCD-Display
#define CTRL_REG 0 // Select instruction register
#define DATA_REG 1 // Select data register
#define BLINK 0x01 // Alias for blinking cursor
#define NOBLINK 0x00 // Alias for non blinking cursor
#define SHOW 0x02 // Alias for cursor on
#define HIDE 0x00 // Alias for cursor off
#define ON 0x04 // Alias for display on
#define OFF 0x00 // Alias for display off
// END DEFINES ======================================================
// ISR-Prototypes ===================================================
void External0_ISR(void) interrupt 0; // ISR for the external input INT0
void Timer0_ISR(void) interrupt 1 using 2; // ISR for Timer0 overflow
void External1_ISR(void) interrupt 2; // ISR for the external input INT1
void Timer1_ISR(void) interrupt 3 using 3; // ISR for Timer1 overflow
void Serial_ISR(void) interrupt 4 using 1; // ISR for serial reception
void Timer2_ISR(void) interrupt 5; // ISR for Timer2 overflow
// END ISR-Prototypes ===============================================
// Prototypes =======================================================
void init_MCU(void); // Initialize the MCU
void delay(unsigned int time_100us); // Timer dependend delay-routine
void putchar(unsigned char value); // Send a character via UART
void UART_puts(unsigned char *text); // Sends a string to the UART
void init_LCD(void); // Initialize the LCD display
void clrscr(void); // Clears LCD screen
void LCD_putchar(unsigned char value); // Writes a character to display
// Prints a text to x/y position
void LCD_printxy(unsigned char x,unsigned char y, unsigned char *text);
// Controls the display
void control_LCD(unsigned char dsp,unsigned char blink,unsigned char cursor);
// Sets LCD write position
void gotoxy(unsigned char x,unsigned char y);
// END Prototypes ===================================================
// Globals ==========================================================
// Table to select DD-RAM address (including instruction and address)
// 0x00..0x0F -> Line 1, 0x40..0x4F -> Line 2
static unsigned char code LOCATION[2][16] = { {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,
0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F},
{0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,
0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF} };
volatile unsigned int DELAY; // Global delaytime
// END Globals ======================================================
/********************************************************************/
/* Function : External0_ISR() ISR */
/*------------------------------------------------------------------*/
/* Description : Interrupt-Service-Routine on vector #0 for */
/* handling interrupt requests on external pin P3_2. */
/*------------------------------------------------------------------*/
/* Author : Thorsten Godau NT8 */
/*------------------------------------------------------------------*/
/* Input : none */
/*------------------------------------------------------------------*/
/* Returnvalue : none */
/*------------------------------------------------------------------*/
/* History : 06/99 V1.0 Basic routine */
/* */
/********************************************************************/
void External0_ISR(void) interrupt 0
{
// Safety-routine
_asm
nop
_endasm;
return;
}
/********************************************************************/
/* Function : Timer0_ISR() ISR */
/*------------------------------------------------------------------*/
/* Description : Interrupt-Service-Routine on vector #1 for */
/* handling Timer0 interrupts. Register set #2 is */
/* used to store important registers. */
/* The routine is called every 200祍. */
/*------------------------------------------------------------------*/
/* Author : Thorsten Godau NT8 */
/*------------------------------------------------------------------*/
/* Input : none */
/*------------------------------------------------------------------*/
/* Returnvalue : none */
/*------------------------------------------------------------------*/
/* History : 06/99 V1.0 Basic routine */
/* */
/********************************************************************/
void Timer0_ISR(void) interrupt 1 using 2
{
ET0 = 0; // Disable Timer0-interrupt
if ( DELAY > 0 ) DELAY--; // Timebase ticks for delay-routine
ET0 = 1; // Enable Timer0-interrupt
return;
}
/********************************************************************/
/* Function : External1_ISR() ISR */
/*------------------------------------------------------------------*/
/* Description : Interrupt-Service-Routine on vector #2 for */
/* handling interrupt requests on external pin P3_3. */
/* Free for further use. */
/*------------------------------------------------------------------*/
/* Author : Thorsten Godau NT8 */
/*------------------------------------------------------------------*/
/* Input : none */
/*------------------------------------------------------------------*/
/* Returnvalue : none */
/*------------------------------------------------------------------*/
/* History : 06/99 V1.0 Basic routine */
/* */
/********************************************************************/
void External1_ISR(void) interrupt 2
{
// Safety-routine
_asm
nop
_endasm;
return;
}
/********************************************************************/
/* Function : Timer1_ISR() ISR */
/*------------------------------------------------------------------*/
/* Description : Interrupt-Service-Routine on vector #3 for */
/* handling Timer1 interrupts. Register set #3 is */
/* used to store important registers. */
/* Free for further use. */
/*------------------------------------------------------------------*/
/* Author : Thorsten Godau NT8 */
/*------------------------------------------------------------------*/
/* Input : none */
/*------------------------------------------------------------------*/
/* Returnvalue : none */
/*------------------------------------------------------------------*/
/* History : 06/99 V1.0 Basic routine */
/* */
/********************************************************************/
void Timer1_ISR(void) interrupt 3 using 3
{
ET1 = 0; // Disable Timer1-interrupt
// Safety-routine
_asm
nop
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