void HD44780_74HC595::begin() {
pinMode(_SRDataPin, OUTPUT);
pinMode(_SRNextValuePin, OUTPUT);
pinMode(_SRValidatePin, OUTPUT);
pinMode(_SRResetPin, OUTPUT);
pinMode(_LCDRegisterSelectPin, OUTPUT);
pinMode(_LCDValidatePin, OUTPUT);
// Init all outputs
digitalWrite(_SRDataPin, LOW);
digitalWrite(_SRNextValuePin, LOW);
digitalWrite(_SRValidatePin, LOW);
digitalWrite(_SRResetPin, LOW);
digitalWrite(_LCDRegisterSelectPin, LOW);
digitalWrite(_LCDValidatePin, LOW);
delayMicroseconds(10);
// Init 74HC595
SRreset();
// Wait 50ms
delay(15);
// Init LCD
LCDcommand(_LCDSize);
LCDcommand(LCD_CLEARDISPLAY);
LCDcommand(LCD_ENTRYMODELEFT);
LCDcommand(_LCDDisplayMode);
}
void HD44780_74HC595::LCDonoff(bool value){
if (value == true) {
LCDcommand(_LCDDisplayMode);
LCDOn = true;
} else {
LCDcommand(LCD_DISPLAYOFF);
LCDOn = false;
}
}
void LCDsetContrast(uint8_t val)
{
if (val > 0x7f) {
val = 0x7f;
}
LCDcommand(PCD8544_FUNCTIONSET | PCD8544_EXTENDEDINSTRUCTION );
LCDcommand( PCD8544_SETVOP | val);
LCDcommand(PCD8544_FUNCTIONSET);
}
void LCDdisplay(void)
{
uint8_t col, maxcol, p;
for(p = 0; p < 6; p++)
{
#ifdef enablePartialUpdate
/* check if this page is part of update*/
if ( yUpdateMin >= ((p+1)*8) )
{
continue; /* nope, skip it! */
}
if (yUpdateMax < p*8)
{
break;
}
#endif
LCDcommand(PCD8544_SETYADDR | p);
#ifdef enablePartialUpdate
col = xUpdateMin;
maxcol = xUpdateMax;
#else
/* start at the beginning of the row */
col = 0;
maxcol = LCDWIDTH-1;
#endif
LCDcommand(PCD8544_SETXADDR | col);
for(; col <= maxcol; col++) {
/*uart_putw_dec(col); */
/*uart_putchar(' '); */
LCDdata(pcd8544_buffer[(LCDWIDTH*p)+col]);
}
}
LCDcommand(PCD8544_SETYADDR ); /* no idea why this is necessary but it is to finish the last byte? */
#ifdef enablePartialUpdate
xUpdateMin = LCDWIDTH - 1;
xUpdateMax = 0;
yUpdateMin = LCDHEIGHT-1;
yUpdateMax = 0;
#endif
}
void LCDInit(uint8_t SCLK, uint8_t DIN, uint8_t DC, uint8_t CS, uint8_t RST, uint8_t contrast)
{
_din = DIN;
_sclk = SCLK;
_dc = DC;
_rst = RST;
_cs = CS;
cursor_x = cursor_y = 0;
textsize = 1;
textcolor = BLACK;
/* set pin directions */
pinMode(_din, OUTPUT);
pinMode(_sclk, OUTPUT);
pinMode(_dc, OUTPUT);
pinMode(_rst, OUTPUT);
pinMode(_cs, OUTPUT);
/* toggle RST low to reset; CS low so it'll listen to us */
if (_cs > 0)
digitalWrite(_cs, LOW);
digitalWrite(_rst, LOW);
_delay_ms(500);
digitalWrite(_rst, HIGH);
/* get into the EXTENDED mode! */
LCDcommand(PCD8544_FUNCTIONSET | PCD8544_EXTENDEDINSTRUCTION );
/* LCD bias select (4 is optimal?) */
LCDcommand(PCD8544_SETBIAS | 0x4);
/* set VOP */
if (contrast > 0x7f)
contrast = 0x7f;
LCDcommand( PCD8544_SETVOP | contrast); /* Experimentally determined */
/* normal mode */
LCDcommand(PCD8544_FUNCTIONSET);
/* Set display to Normal */
LCDcommand(PCD8544_DISPLAYCONTROL | PCD8544_DISPLAYNORMAL);
/* set up a bounding box for screen updates */
updateBoundingBox(0, 0, LCDWIDTH-1, LCDHEIGHT-1);
}
int main (void)
{
// print infos
printf("Raspberry Pi PCD8544 test\n");
printf("========================================\n");
printf("CLK on Port %i \n", _sclk);
printf("DIN on Port %i \n", _din);
printf("DC on Port %i \n", _dc);
printf("CS on Port %i \n", _cs);
printf("RST on Port %i \n", _rst);
printf("========================================\n");
// check wiringPi setup
if (wiringPiSetup() == -1)
{
printf("wiringPi-Error\n");
exit(1);
}
// init and clear lcd
LCDInit(_sclk, _din, _dc, _cs, _rst, contrast);
LCDclear();
// turn all the pixels on (a handy test)
printf("Test: All pixels on.\n");
LCDcommand(PCD8544_DISPLAYCONTROL | PCD8544_DISPLAYALLON);
delay(1000);
// back to normal
printf("Test: All pixels off.\n");
LCDcommand(PCD8544_DISPLAYCONTROL | PCD8544_DISPLAYNORMAL);
LCDclear();
// display logo
printf("Test: Display logo.\n");
LCDshowLogo();
delay(2000);
LCDclear();
// draw a single pixel
printf("Test: Display single pixel.\n");
LCDsetPixel(10, 10, BLACK);
LCDdisplay();
delay(2000);
LCDclear();
// draw many lines
printf("Test: Draw many lines.\n");
int i;
for (i=0; i<84; i+=4) {
LCDdrawline(0, 0, i, 47, BLACK);
}
for (i=0; i<48; i+=4) {
LCDdrawline(0, 0, 83, i, BLACK);
}
LCDdisplay();
delay(2000);
LCDclear();
// draw rectangles
printf("Test: Draw rectangles.\n");
for (i=0; i<48; i+=2) {
LCDdrawrect(i, i, 96-i, 48-i, BLACK);
}
LCDdisplay();
delay(2000);
LCDclear();
// draw multiple rectangles
printf("Test: Draw multiple rectangles.\n");
for (i=0; i<48; i++) {
// alternate colors for moire effect
LCDfillrect(i, i, 84-i, 48-i, i%2);
}
LCDdisplay();
delay(2000);
LCDclear();
// draw mulitple circles
printf("Test: Draw multiple circles.\n");
for (i=0; i<48; i+=2) {
LCDdrawcircle(41, 23, i, BLACK);
}
LCDdisplay();
delay(2000);
LCDclear();
// draw the first ~120 characters in the font
printf("Test: Draw the first ~120 chars.\n");
for (i=0; i < 64; i++) {
LCDdrawchar((i % 14) * 6, (i/14) * 8, i);
}
LCDdisplay();
delay(2000);
for (i=0; i < 64; i++) {
LCDdrawchar((i % 14) * 6, (i/14) * 8, i + 64);
}
LCDdisplay();
delay(2000);
LCDclear();
return 0;
}
