/*
** Liquid.c
** Interfacing to an LCD display
** 
** 11/10/07 v2.0 LDJ PIC32 porting
*/
// configuration bit settings, Fcy=72MHz, Fpb=36MHz
#pragma config POSCMOD=XT, FNOSC=PRIPLL 
#pragma config FPLLIDIV=DIV_2, FPLLMUL=MUL_18, FPLLODIV=DIV_1
#pragma config FPBDIV=DIV_2, FWDTEN=OFF, CP=OFF, BWP=OFF

#include <p32xxxx.h>

#define LCDDATA 1
#define LCDCMD  0
#define PMDATA  PMDIN

void initLCD( void)
{
    // PMP initialization changed considerably!!!
    PMCON = 0x8303;    // Enable the PMP, demuxed, RD/WR and E  
    PMMODE = 0x3FF;    // 8-bit, Master Mode 1, max wait states
	PMAEN = 0x0001;    // only PMA0 enabled
    
    // init TMR1
    T1CON = 0x8030;    // Fpb/2, prescaled 1:256, 6us/tick

    // wait for >30ms
    TMR1 = 0; while( TMR1<6000);// 6000 x 6us = 36ms   
    
    //initiate the HD44780 display 8-bit init sequence
    PMADDR = LCDCMD;            // command register
    PMDATA = 0x38;              // 8-bit int, 2 lines, 5x7
    TMR1 = 0; while( TMR1<8);   // 8 x 6us = 48us   
    
    PMDATA = 0x0c;              // disp.ON, no cursor, no blink
    TMR1 = 0; while( TMR1<8);   // 8 x 6us = 48us   
    
    PMDATA = 1;                 // clear display
    TMR1 = 0; while( TMR1<300); // 300 x 6us = 1.8ms   
    
    PMDATA = 6;                 // increment cursor, no shift
    TMR1 = 0; while( TMR1<300); // 300 x 6us = 1.8ms   
} // initLCD


char readLCD( int addr)
{
    int dummy;
    while( PMMODEbits.BUSY);    // wait for PMP to be available
    PMADDR = addr;              // select the command address
    dummy = PMDATA;             // init read cycle, dummy read
    while( PMMODEbits.BUSY);    // wait for PMP to be available
    return( PMDATA);            // read the status register
    
} // readLCD

#define busyLCD() readLCD( LCDCMD) & 0x80
#define addrLCD() readLCD( LCDCMD) & 0x7F
#define getLCD()  readLCD( LCDDATA)


void writeLCD( int addr, char c)    
{
    while( busyLCD());
    while( PMMODEbits.BUSY);    // wait for PMP to be available
    PMADDR = addr;
    PMDATA = c;
} // writeLCD
    
#define putLCD( d)  writeLCD( LCDDATA, (d))
#define cmdLCD( c)  writeLCD( LCDCMD, (c))

void putsLCD( char *s)
{
    while( *s) putLCD( *s++);
} //putsLCD


main( void)
{
    int i;
        
    // initializations
    initLCD();
    
    // put a title on the first line    
    putsLCD( "Exploring      ");

    // put the cursor on the second line
    cmdLCD( 0x80 | 0x40);		
    putsLCD( "      the PIC32");

    // main loop
    while( 1)
    {        
    } // main loop
} // main