// write either command or data, with automatic 4/8-bit selection
void PCFCrystal::send(uint8_t value, uint8_t mode) {
/*
// ORIGINAL CODE
digitalWrite(_rs_pin, mode);
// if there is a RW pin indicated, set it low to Write
if (_rw_pin != -1) {
digitalWrite(_rw_pin, LOW);
}
*/
setBit(modeBuffer(), _rs_pin, mode);
// if there is a RW pin indicated, set it low to Write
if (_rw_pin) {
setBit(modeBuffer(), _rw_pin, LOW);
}
writePCF(modeAddress(), *modeBuffer());
//return;
if (_displayfunction & LCD_8BITMODE) {
write8bits(value);
} else {
write4bits(value>>4);
write4bits(value);
}
}
void PCFCrystal::pulseEnable(void) {
// Set the value if it's in a separate PCF
if (_addressextra)
writePCF(_address, *_data);
/*
// ORIGINAL CODE
digitalWrite(_enable_pin, LOW);
delayMicroseconds(1);
digitalWrite(_enable_pin, HIGH);
delayMicroseconds(1); // enable pulse must be >450ns
digitalWrite(_enable_pin, LOW);
delayMicroseconds(100); // commands need > 37us to settle
*/
uint8_t *buff = modeBuffer();
uint8_t address = modeAddress();
setBit(buff, _enable_pin, LOW);
writePCF(address, *buff);
// ORIGINAL CODE. These 3 delays are omitted as the PCF writing takes longer
// delayMicroseconds(1);
setBit(buff, _enable_pin, HIGH);
writePCF(address, *buff);
// delayMicroseconds(1); // enable pulse must be >450ns
setBit(buff, _enable_pin, LOW);
writePCF(address, *buff);
// delayMicroseconds(100); // commands need > 37us to settle
}
GS_CHANGE_MODE()
{
mem_req_t memReq;
memReq.rw = WRITE;
memReq.size = WORD;
memReq.addr = modeAddress(Input.pageId)
memReq.data = modeChange(memRep.data, Input.pageId)
memRep = mem(memReq);
rank = Input.rankUpdate;
State = GS_WRITE_RANK;
}
GS_CHANGE_MODE()
{
mem_req_t memReq2;
memReq2.rw = WRITE;
memReq2.size = WORD;
memReq2.addr = modeAddress(Input.pageId);
memReq2.data = modeWrite(memRep.data, Input.pageId);
memRep = mem(memReq2);
//rank = Input.rankUpdate;
State = GS_WRITE_RANK;
}
//Then see if page rank is initialized yet
//If not, zero it out. If yest, go to add.
GS_READ_MODE()
{
bit oldMode;
mem_req_t memReq;
memReq.rw = READ;
memReq.size = WORD;
memReq.addr = modeAddress(Input.pageId);
memRep = mem(memReq);
oldMode = modeRead(memRep.data);
if (oldMode ^ mode) {
State = GS_READ_RANK;
} else {
State = GS_CHANGE_MODE;
}
}
//Then see if page rank is initialized yet
//If not, zero it out. If yes, go to add.
GS_READ_MODE()
{
bit oldMode;
mem_req_t memReq1;
memReq1.rw = READ;
memReq1.size = WORD;
memReq1.addr = modeAddress(Input.pageId);
memRep = mem(memReq1);
oldMode = modeRead(memRep.data, Input.pageId);
// if (oldMode ^ mode) {
State = GS_READ_RANK;
// } else {
// State = GS_CHANGE_MODE;
// }
}
void PCFCrystal::begin(uint8_t cols, uint8_t lines, uint8_t dotsize) {
if (lines > 1) {
_displayfunction |= LCD_2LINE;
}
_numlines = lines;
_currline = 0;
// for some 1 line displays you can select a 10 pixel high font
if ((dotsize != 0) && (lines == 1)) {
_displayfunction |= LCD_5x10DOTS;
}
// SEE PAGE 45/46 FOR INITIALIZATION SPECIFICATION!
// according to datasheet, we need at least 40ms after power rises above 2.7V
// before sending commands. Arduino can turn on way befer 4.5V so we'll wait 50
delayMicroseconds(50000);
// Now we pull both RS and R/W low to begin commands
/*
// ORIGINAL CODE
digitalWrite(_rs_pin, LOW);
digitalWrite(_enable_pin, LOW);
if (_rw_pin != -1) {
digitalWrite(_rw_pin, LOW);
}
*/
uint8_t *buff = modeBuffer();
setBit(buff, _rs_pin, LOW);
setBit(buff, _enable_pin, LOW);
if (_rw_pin)
setBit(buff, _rw_pin, LOW);
writePCF(modeAddress(), *buff);
//put the LCD into 4 bit or 8 bit mode
if (! (_displayfunction & LCD_8BITMODE)) {
// this is according to the hitachi HD44780 datasheet
// figure 24, pg 46
// we start in 8bit mode, try to set 4 bit mode
write4bits(0x03);
delayMicroseconds(4500); // wait min 4.1ms
// second try
write4bits(0x03);
delayMicroseconds(4500); // wait min 4.1ms
// third go!
write4bits(0x03);
delayMicroseconds(150);
// finally, set to 8-bit interface
write4bits(0x02);
} else {
// this is according to the hitachi HD44780 datasheet
// page 45 figure 23
// Send function set command sequence
command(LCD_FUNCTIONSET | _displayfunction);
delayMicroseconds(4500); // wait more than 4.1ms
// second try
command(LCD_FUNCTIONSET | _displayfunction);
delayMicroseconds(150);
// third go
command(LCD_FUNCTIONSET | _displayfunction);
}
// finally, set # lines, font size, etc.
command(LCD_FUNCTIONSET | _displayfunction);
// turn the display on with no cursor or blinking default
_displaycontrol = LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKOFF;
display();
// clear it off
clear();
// Initialize to default text direction (for romance languages)
_displaymode = LCD_ENTRYLEFT | LCD_ENTRYSHIFTDECREMENT;
// set the entry mode
command(LCD_ENTRYMODESET | _displaymode);
}
