Guangmin Tang
tr
Diff: N5110.cpp
- Revision:
- 34:626b873e6362
- Parent:
- 30:11986573659e
- Parent:
- 29:5bc91bd44c77
--- a/N5110.cpp Wed Feb 08 19:50:56 2017 +0000
+++ b/N5110.cpp Wed Mar 01 14:41:31 2017 +0000
@@ -4,29 +4,40 @@
// overloaded constructor includes power pin - LCD Vcc connected to GPIO pin
// this constructor works fine with LPC1768 - enough current sourced from GPIO
// to power LCD. Doesn't work well with K64F.
-N5110::N5110(PinName pwrPin, PinName scePin, PinName rstPin, PinName dcPin, PinName mosiPin, PinName sclkPin, PinName ledPin)
+N5110::N5110(PinName const pwrPin,
+ PinName const scePin,
+ PinName const rstPin,
+ PinName const dcPin,
+ PinName const mosiPin,
+ PinName const sclkPin,
+ PinName const ledPin)
{
- spi = new SPI(mosiPin,NC,sclkPin); // create new SPI instance and initialise
// set up pins as required
- led = new PwmOut(ledPin);
- pwr = new DigitalOut(pwrPin);
- sce = new DigitalOut(scePin);
- rst = new DigitalOut(rstPin);
- dc = new DigitalOut(dcPin);
+ _spi = new SPI(mosiPin,NC,sclkPin); // create new SPI instance and initialise
+ _led = new PwmOut(ledPin);
+ _pwr = new DigitalOut(pwrPin);
+ _sce = new DigitalOut(scePin);
+ _rst = new DigitalOut(rstPin);
+ _dc = new DigitalOut(dcPin);
}
// overloaded constructor does not include power pin - LCD Vcc must be tied to +3V3
// Best to use this with K64F as the GPIO hasn't sufficient output current to reliably
// drive the LCD.
-N5110::N5110(PinName scePin, PinName rstPin, PinName dcPin, PinName mosiPin, PinName sclkPin, PinName ledPin)
+N5110::N5110(PinName const scePin,
+ PinName const rstPin,
+ PinName const dcPin,
+ PinName const mosiPin,
+ PinName const sclkPin,
+ PinName const ledPin)
{
- spi = new SPI(mosiPin,NC,sclkPin); // create new SPI instance and initialise
// set up pins as required
- pwr = NULL; // pwr not needed so null it to be safe
- led = new PwmOut(ledPin);
- sce = new DigitalOut(scePin);
- rst = new DigitalOut(rstPin);
- dc = new DigitalOut(dcPin);
+ _spi = new SPI(mosiPin,NC,sclkPin); // create new SPI instance and initialise
+ _pwr = NULL; // pwr not needed so null it to be safe
+ _led = new PwmOut(ledPin);
+ _sce = new DigitalOut(scePin);
+ _rst = new DigitalOut(rstPin);
+ _dc = new DigitalOut(dcPin);
}
// initialise function - powers up and sends the initialisation commands
@@ -69,8 +80,8 @@
// function to power up the LCD and backlight - only works when using GPIO to power
void N5110::turnOn()
{
- if (pwr != NULL) {
- pwr->write(1); // apply power
+ if (_pwr != NULL) {
+ _pwr->write(1); // apply power
}
}
@@ -91,8 +102,8 @@
wait_ms(10);
// if we are powering the LCD using the GPIO then make it low to turn off
- if (pwr != NULL) {
- pwr->write(0); // turn off power
+ if (_pwr != NULL) {
+ _pwr->write(0); // turn off power
}
}
@@ -106,33 +117,32 @@
if (brightness > 1.0f)
brightness = 1.0f;
// set PWM duty cycle
- led->write(brightness);
+ _led->write(brightness);
}
// pulse the active low reset line
void N5110::reset()
{
- rst->write(0); // reset the LCD
- rst->write(1);
+ _rst->write(0); // reset the LCD
+ _rst->write(1);
}
// function to initialise SPI peripheral
void N5110::initSPI()
{
- spi->format(8,1); // 8 bits, Mode 1 - polarity 0, phase 1 - base value of clock is 0, data captured on falling edge/propagated on rising edge
- spi->frequency(4000000); // maximum of screen is 4 MHz
+ _spi->format(8,1); // 8 bits, Mode 1 - polarity 0, phase 1 - base value of clock is 0, data captured on falling edge/propagated on rising edge
+ _spi->frequency(4000000); // maximum of screen is 4 MHz
}
// send a command to the display
void N5110::sendCommand(unsigned char command)
{
- dc->write(0); // set DC low for command
- sce->write(0); // set CE low to begin frame
- spi->write(command); // send command
- dc->write(1); // turn back to data by default
- sce->write(1); // set CE high to end frame (expected for transmission of single byte)
-
+ _dc->write(0); // set DC low for command
+ _sce->write(0); // set CE low to begin frame
+ _spi->write(command); // send command
+ _dc->write(1); // turn back to data by default
+ _sce->write(1); // set CE high to end frame (expected for transmission of single byte)
}
// send data to the display at the current XY address
@@ -140,26 +150,26 @@
// be the default mode.
void N5110::sendData(unsigned char data)
{
- sce->write(0); // set CE low to begin frame
- spi->write(data);
- sce->write(1); // set CE high to end frame (expected for transmission of single byte)
+ _sce->write(0); // set CE low to begin frame
+ _spi->write(data);
+ _sce->write(1); // set CE high to end frame (expected for transmission of single byte)
}
// this function writes 0 to the 504 bytes to clear the RAM
void N5110::clearRAM()
{
- sce->write(0); //set CE low to begin frame
+ _sce->write(0); //set CE low to begin frame
for(int i = 0; i < WIDTH * HEIGHT; i++) { // 48 x 84 bits = 504 bytes
- spi->write(0x00); // send 0's
+ _spi->write(0x00); // send 0's
}
- sce->write(1); // set CE high to end frame
-
+ _sce->write(1); // set CE high to end frame
}
// function to set the XY address in RAM for subsequenct data write
-void N5110::setXYAddress(int x, int y)
+void N5110::setXYAddress(unsigned int const x,
+ unsigned int const y)
{
- if (x>=0 && x<WIDTH && y>=0 && y<HEIGHT) { // check within range
+ if (x<WIDTH && y<HEIGHT) { // check within range
sendCommand(0x80 | x); // send addresses to display with relevant mask
sendCommand(0x40 | y);
}
@@ -168,25 +178,28 @@
// These functions are used to set, clear and get the value of pixels in the display
// Pixels are addressed in the range of 0 to 47 (y) and 0 to 83 (x). The refresh()
// function must be called after set and clear in order to update the display
-void N5110::setPixel(int x, int y)
+void N5110::setPixel(unsigned int const x,
+ unsigned int const y)
{
- if (x>=0 && x<WIDTH && y>=0 && y<HEIGHT) { // check within range
+ if (x<WIDTH && y<HEIGHT) { // check within range
// calculate bank and shift 1 to required position in the data byte
buffer[x][y/8] |= (1 << y%8);
}
}
-void N5110::clearPixel(int x, int y)
+void N5110::clearPixel(unsigned int const x,
+ unsigned int const y)
{
- if (x>=0 && x<WIDTH && y>=0 && y<HEIGHT) { // check within range
+ if (x<WIDTH && y<HEIGHT) { // check within range
// calculate bank and shift 1 to required position (using bit clear)
buffer[x][y/8] &= ~(1 << y%8);
}
}
-int N5110::getPixel(int x, int y)
+int N5110::getPixel(unsigned int const x,
+ unsigned int const y) const
{
- if (x>=0 && x<WIDTH && y>=0 && y<HEIGHT) { // check within range
+ if (x<WIDTH && y<HEIGHT) { // check within range
// return relevant bank and mask required bit
int pixel = (int) buffer[x][y/8] & (1 << y%8);
@@ -208,14 +221,14 @@
// address auto increments after printing string, so buffer[0][0] will not coincide
// with top-left pixel after priting string
- sce->write(0); //set CE low to begin frame
+ _sce->write(0); //set CE low to begin frame
for(int j = 0; j < BANKS; j++) { // be careful to use correct order (j,i) for horizontal addressing
for(int i = 0; i < WIDTH; i++) {
- spi->write(buffer[i][j]); // send buffer
+ _spi->write(buffer[i][j]); // send buffer
}
}
- sce->write(1); // set CE high to end frame
+ _sce->write(1); // set CE high to end frame
}
@@ -233,9 +246,11 @@
}
// function to print 5x7 font
-void N5110::printChar(char c,int x,int y)
+void N5110::printChar(char const c,
+ unsigned int const x,
+ unsigned int const y)
{
- if (y>=0 && y<BANKS) { // check if printing in range of y banks
+ if (y<BANKS) { // check if printing in range of y banks
for (int i = 0; i < 5 ; i++ ) {
int pixel_x = x+i;
@@ -244,14 +259,16 @@
buffer[pixel_x][y] = font5x7[(c - 32)*5 + i];
// array is offset by 32 relative to ASCII, each character is 5 pixels wide
}
-
+
}
}
// function to print string at specified position
-void N5110::printString(const char * str,int x,int y)
+void N5110::printString(const char *str,
+ unsigned int const x,
+ unsigned int const y)
{
- if (y>=0 && y<BANKS) { // check if printing in range of y banks
+ if (y<BANKS) { // check if printing in range of y banks
int n = 0 ; // counter for number of characters in string
// loop through string and print character
@@ -278,7 +295,7 @@
}
// function to plot array on display
-void N5110::plotArray(float array[])
+void N5110::plotArray(float const array[])
{
for (int i=0; i<WIDTH; i++) { // loop through array
// elements are normalised from 0.0 to 1.0, so multiply
@@ -290,7 +307,10 @@
}
// function to draw circle
-void N5110:: drawCircle(int x0,int y0,int radius,int fill)
+void N5110:: drawCircle(unsigned int const x0,
+ unsigned int const y0,
+ unsigned int const radius,
+ unsigned int const fill)
{
// from http://en.wikipedia.org/wiki/Midpoint_circle_algorithm
int x = radius;
@@ -330,7 +350,11 @@
}
-void N5110::drawLine(int x0,int y0,int x1,int y1,int type)
+void N5110::drawLine(unsigned int const x0,
+ unsigned int const y0,
+ unsigned int const x1,
+ unsigned int const y1,
+ unsigned int const type)
{
int y_range = y1-y0; // calc range of y and x
int x_range = x1-x0;
@@ -378,7 +402,11 @@
}
-void N5110::drawRect(int x0,int y0,int width,int height,int fill)
+void N5110::drawRect(unsigned int const x0,
+ unsigned int const y0,
+ unsigned int const width,
+ unsigned int const height,
+ unsigned int const fill)
{
if (fill == 0) { // transparent, just outline
drawLine(x0,y0,x0+(width-1),y0,1); // top
@@ -391,4 +419,4 @@
drawLine(x0,y,x0+(width-1),y,type); // draw line across screen
}
}
-}
+}
\ No newline at end of file