writedataxlcd.c

来自「Microchip的官方PIC24H系列16位单片机的外设源程序库。」· C语言 代码 · 共 84 行

#include <p30fxxxx.h>
#include <xlcd.h>

/*External LCD functions are only defined for the following devices */
#if defined(__dsPIC30F5011__) || defined(__dsPIC30F5013__) || defined(__dsPIC30F6010__) || \
    defined(__dsPIC30F6011__) || defined(__dsPIC30F6012__) || defined(__dsPIC30F6013__) || \
    defined(__dsPIC30F6014__)

/*******************************************************************
Function Name:            WriteDataXLCD
Description:              This function writes a data byte into the 
                          DDRam/CGRam of the LCD controller.The user
                          must first check the busy  status of the 
                          LCD controller  by calling the BusyXLCD()
                          function.The data written can go to the 
                          DDRam or CGRam depending on the previous
                          SetXXRamAddr( char) that was  called.
Input parameters:         char data
Return value:             void
********************************************************************/

void WriteDataXLCD( char data)
{
    RW_PIN = 0;  /* enable write */
    RS_PIN = 1;  /* select Data Reg */
                     
    /* configure the common data pins as output */
    TRIS_DATA_PIN_7 = 0;
    TRIS_DATA_PIN_6 = 0;
    TRIS_DATA_PIN_5 = 0;
    TRIS_DATA_PIN_4 = 0;

    DATA_PIN_7 = (unsigned int)((data & 0x80)>>7);
    DATA_PIN_6 = (unsigned int)((data & 0x40)>>6);
    DATA_PIN_5 = (unsigned int)((data & 0x20)>>5);
    DATA_PIN_4 = (unsigned int)((data & 0x10)>>4);

# ifdef EIGHT_BIT_INTERFACE
    /* configure the other pins as output */
    TRIS_DATA_PIN_3 = 0;
    TRIS_DATA_PIN_2 = 0;
    TRIS_DATA_PIN_1 = 0;
    TRIS_DATA_PIN_0 = 0;

    DATA_PIN_3 = (unsigned int)((data & 0x08)>>3);
    DATA_PIN_2 = (unsigned int)((data & 0x04)>>2);
    DATA_PIN_1 = (unsigned int)((data & 0x02)>>1);
    DATA_PIN_0 = (unsigned int)(data & 0x01);

    E_PIN = 1;
    Delay18Tcy();
    E_PIN = 0;
# else
    E_PIN = 1;
    Delay18Tcy();
    E_PIN = 0;

    RW_PIN = 0;   /* enable write */
    RS_PIN = 1;   /* select Data Reg */
    DATA_PIN_7 = (unsigned int)((data & 0x08)>>3);
    DATA_PIN_6 = (unsigned int)((data & 0x04)>>2);
    DATA_PIN_5 = (unsigned int)((data & 0x02)>>1);
    DATA_PIN_4 = (unsigned int)(data & 0x01);

    E_PIN = 1;
    Delay18Tcy( );
    E_PIN = 0;
#endif
    /*configure all pins to input mode*/
    TRIS_DATA_PIN_7 = 1;
    TRIS_DATA_PIN_6 = 1;
    TRIS_DATA_PIN_5 = 1;
    TRIS_DATA_PIN_4 = 1;
# ifdef EIGHT_BIT_INTERFACE
    TRIS_DATA_PIN_3 = 1;
    TRIS_DATA_PIN_2 = 1;
    TRIS_DATA_PIN_1 = 1;
    TRIS_DATA_PIN_0 = 1;
#endif
}  /* end of function */

#endif
/* end of file */