lcd.c

瑞萨(Renesas)M16C系列芯片的函数库

#include "lcd1.h"	// LCD utility (written in assembler) header file
#include "lcd.h"	// LCD utility (writeen in C) header file

/*""FUNC COMMENT""*************************************************************
* ID         		: ---
* Function name     : void _init_lcd(void)
* Function     		: initialize the LCD 
* Paramenter   		: none
* Return 	 		: none
* Function used		: _lcd1__initial() : initialize the LCD control port
*					: _lcd1__wait(unsigned int) : software wait for t*100us
*					: _lcd1__wr_nibble_creg(int) : write command to LCD (4bit)
*					: write_creg(char) : write command to LCD (8bit)
*					: is_busy(void)	: wait for busy flag free
* Notice	   		: none
* History    		: ---
*""FUNC COMMENT END""*********************************************************/
void init_lcd(void)
{
    _lcd1__initial();                   /* initialize the LCD control port          */

    /*--- initial process after LCD reset ---*/
    _lcd1__wait(150);                   /* wait 15ms after VDD is steady        */
    _lcd1__wr_nibble_creg(0x03);        /* function set 8bit(0x03)   */

    _lcd1__wait(41);                    /* wait 4.1ms                        */
    _lcd1__wr_nibble_creg(0x03);        /* function set 8bit(0x03)   */

    _lcd1__wait(1);                     /* wait 0.1ms                        */
    _lcd1__wr_nibble_creg(0x03);        /* function set 8bit(0x03)   */

    _lcd1__wait(1);                     /* wait 0.1ms                        */
    _lcd1__wr_nibble_creg(0x02);        /* function set 4bit (0x02)   */
    _lcd1__wait(1);                     /* wait 0.1ms                         */
    write_creg(CMD_FUNC_D4_N2_F7);      /* set interface data length as 4 bit    */
                                        /* 2 lines, 5*7 dots                */

    _lcd1__wait(1);                     /* wait 0.1ms                       */
    write_creg(CMD_DISP_DS);            /* display off                        */
    while(is_busy());                   /* wait for busy flag free            */
    write_creg(CMD_CLEAR);              /* clear display                       */
    while(is_busy());                   /* wait for busy flag free           */
    write_creg(CMD_ENTRY_INC);         /* entry mode, increment  */
    while(is_busy());                   /* wait for busy flag free           */
    write_creg(CMD_DISP_EN);            /* display on, cursol off          */
                                        /* blink off                    */
}


/*""FUNC COMMENT""*************************************************************
* ID         		: ---
* Function name     : void set_cursol(int x, int y)
* Function     		: set cursol position
* Paramenter   		: int x : X axis
*					: int y : Y axis
* Return 	 		: none
* Function used		: write_creg(char) : write command to LCD (8bit)
*					: is_busy(void)	: wait for busy flag free
* Notice	   		: none
* History    		: ---
*""FUNC COMMENT END""*********************************************************/
void set_cursol(int x, int y)
{
    while(is_busy());
    write_creg(0x80 | y*0x40 + x);      /* internal address of the second line is from 0x40 to 0x4f  */
}


/*""FUNC COMMENT""*************************************************************
* ID         		: ---
* Function name     : void write_lcd(const char* msg)
* Function     		: write string to LCD
* Paramenter   		: const char* : address of string to write to LCD
* Return 	 		: none
* Function used		: write_dreg(char) : write data to LCD (8bit)
*					: is_busy(void)	: wait for busy flag free
* Notice	   		: none
* History    		: ---
*""FUNC COMMENT END""*********************************************************/
void write_lcd(const char *msg)
{
    for( ; '\0' != *msg; msg++){
        while(is_busy());
        write_dreg(*msg);
    }
}

void write_lcd_char(const char msg)
{
	while(is_busy());
    write_dreg(msg);
}

/*""FUNC COMMENT""*************************************************************
* ID         		: ---
* Function name     : int is_busy(void)
* Function     		: check busy flag
* Paramenter   		: none
* Return 	 		: int : state of busy flag
* Function used		: read_creg() : read command from LCD
* Notice	   		: none
* History    		: ---
*""FUNC COMMENT END""*********************************************************/
int is_busy(void)
{
    if(0x80 & read_creg()){                     /* if(BusyFlag)             */
        return TRUE;
    }
    else{
        return FALSE;
    }
}


/*""FUNC COMMENT""*************************************************************
* ID         		: ---
* Function name     : char read_creg(void)
* Function     		: read command from LCD
* Paramenter   		: none
* Return 	 		: char : command read from LCD
* Function used		: _lcd1__rd_nibble_creg() : read command from LCD
* Notice	   		: none
* History    		: ---
*""FUNC COMMENT END""*********************************************************/
char read_creg(void)
{
    char command;
    command  = _lcd1__rd_nibble_creg() << 4;    /* interface length 4bit     */
    command |= _lcd1__rd_nibble_creg();
    return command;
}


/*""FUNC COMMENT""*************************************************************
* ID         		: ---
* Function name     : void write_creg(char data)
* Function     		: write command to LCD
* Paramenter   		: char data : command to write to LCD
* Return 	 		: none
* Function used		: _lcd1__wr_nibble_creg() : write command to LCD
* Notice	   		: none
* History    		: ---
*""FUNC COMMENT END""*********************************************************/
void write_creg(char data)
{
    _lcd1__wr_nibble_creg(data>>4 & 0x000f);    /* interface length 4bit     */
    _lcd1__wr_nibble_creg(data    & 0x000f);
}


/*""FUNC COMMENT""*************************************************************
* ID         		: ---
* Function name     : char read_dreg(void)
* Function     		: read data from LCD
* Paramenter   		: none
* Return 	 		: char : data read from LCD
* Function used		: _lcd1__rd_nibble_dreg() : read data from LCD
* Notice	   		: none
* History    		: ---
*""FUNC COMMENT END""*********************************************************/
char read_dreg(void)
{
    char data;
    data  = _lcd1__rd_nibble_dreg() << 4;       /* interface length 4bit     */
    data |= _lcd1__rd_nibble_dreg();
    return data;
}


/*""FUNC COMMENT""*************************************************************
* ID         		: ---
* Function name     : void write_dreg(char data)
* Function     		: write data to LCD
* Paramenter   		: char data : data to write to LCD
* Return 	 		: none
* Function used		: _lcd1__wr_nibble_dreg() : write data to LCD
* Notice	   		: none
* History    		: ---
*""FUNC COMMENT END""*********************************************************/
void write_dreg(char data)
{
    _lcd1__wr_nibble_dreg(data>>4 & 0x000f);    /* interface length 4bit     */
    _lcd1__wr_nibble_dreg(data    & 0x000f);
}