writecmdxlcd.c

Mplab C30编译器

#include "xlcd.h"
#include "delay.h"

#ifdef _RD10

/*******************************************************************
Function Name :         WriteCmdXLCD
Description:            This function write a command to the 
                        Instruction Register of the LCD controller.
                        The user must first check if the controller 
                        is busy or not by calling the BusyXLCD()
                        function.
Input parameters:       char cmd
Return value:           void
********************************************************************/
void WriteCmdXLCD(char cmd)
{

	RW_PIN = 0;   /* enable write */
	RS_PIN = 0;   /* select Instruction 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)((cmd & 0x80)>>7);
	DATA_PIN_6 = (unsigned int)((cmd & 0x40)>>6);
	DATA_PIN_5 = (unsigned int)((cmd & 0x20)>>5);
	DATA_PIN_4 = (unsigned int)((cmd & 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)((cmd & 0x08)>>3);
		DATA_PIN_2 = (unsigned int)((cmd & 0x04)>>2);
		DATA_PIN_1 = (unsigned int)((cmd & 0x02)>>1);
		DATA_PIN_0 = (unsigned int)(cmd & 0x01);
		
		E_PIN = 1;
		DelayEPulseWidth();
		E_PIN = 0;
	# else
		E_PIN = 1;
		DelayEPulseWidth();
		E_PIN = 0;
		
		RW_PIN = 0;  /* enable write */
		RS_PIN = 0;  /* select Instruction Reg */
		
		DATA_PIN_7 = (unsigned int)((cmd & 0x08)>>3);
		DATA_PIN_6 = (unsigned int)((cmd & 0x04)>>2);
		DATA_PIN_5 = (unsigned int)((cmd & 0x02)>>1);
		DATA_PIN_4 = (unsigned int)(cmd & 0x01);
		
		E_PIN = 1;
		DelayEPulseWidth();
		E_PIN = 0;
	#endif
	
while(BusyXLCD());

}  /* end of function */

#else 
#warning "Does not build on this target"
#endif