inline void Adafruit_PCD8544::spiWrite(uint8_t d) {
if (isHardwareSPI()) {
// Hardware SPI write.
SPI.transfer(d);
}
else {
printf ("Software SPI is not supported\n");
}
}
inline void Adafruit_PCD8544::spiWrite(uint8_t d) {
if (isHardwareSPI()) {
// Hardware SPI write.
SPI.transfer(d);
}
else {
// Software SPI write with bit banging.
for(uint8_t bit = 0x80; bit; bit >>= 1) {
*clkport &= ~clkpinmask;
if(d & bit) *mosiport |= mosipinmask;
else *mosiport &= ~mosipinmask;
*clkport |= clkpinmask;
}
}
}
void Adafruit_PCD8544::begin(uint8_t contrast, uint8_t bias) {
if (isHardwareSPI()) {
// Setup hardware SPI.
SPI.begin();
SPI.setClockDivider(PCD8544_SPI_CLOCK_DIV);
SPI.setDataMode(SPI_MODE0);
SPI.setBitOrder(MSBFIRST);
}
else {
// Setup software SPI.
// Set software SPI specific pin outputs.
pinMode(_din, OUTPUT);
pinMode(_sclk, OUTPUT);
// Set software SPI ports and masks.
clkport = portOutputRegister(digitalPinToPort(_sclk));
clkpinmask = digitalPinToBitMask(_sclk);
mosiport = portOutputRegister(digitalPinToPort(_din));
mosipinmask = digitalPinToBitMask(_din);
}
// Set common pin outputs.
pinMode(_dc, OUTPUT);
if (_rst > 0)
pinMode(_rst, OUTPUT);
if (_cs > 0)
pinMode(_cs, OUTPUT);
// toggle RST low to reset
if (_rst > 0) {
digitalWrite(_rst, LOW);
delay(500);
digitalWrite(_rst, HIGH);
}
// get into the EXTENDED mode!
command(PCD8544_FUNCTIONSET | PCD8544_EXTENDEDINSTRUCTION );
// LCD bias select (4 is optimal?)
command(PCD8544_SETBIAS | bias);
// set VOP
if (contrast > 0x7f)
contrast = 0x7f;
command( PCD8544_SETVOP | contrast); // Experimentally determined
// normal mode
command(PCD8544_FUNCTIONSET);
// Set display to Normal
command(PCD8544_DISPLAYCONTROL | PCD8544_DISPLAYNORMAL);
// initial display line
// set page address
// set column address
// write display data
// set up a bounding box for screen updates
updateBoundingBox(0, 0, LCDWIDTH-1, LCDHEIGHT-1);
// Push out pcd8544_buffer to the Display (will show the AFI logo)
display();
}
