Library for interfacing to Nokia 5110 LCD display (as found on the SparkFun website).
Dependents: LV7_LCDtest LV7_Grupa5_Tim003_Zadatak1 lv7_Grupa5_Tim008_zad1 LV7_PAI_Grupa5_tim10_Zadatak1 ... more
This library is designed to make it easy to interface an mbed with a Nokia 5110 LCD display.
These can be found at Sparkfun (https://www.sparkfun.com/products/10168) and Adafruit (http://www.adafruit.com/product/338).
The library uses the SPI peripheral on the mbed which means it is much faster sending data to the display than other libraries available on other platforms that use software SPI.
The library can print strings as well as controlling individual pixels, meaning that both text and primitive graphics can be displayed.
N5110.cpp
- Committer:
- eencae
- Date:
- 2014-01-26
- Revision:
- 1:df68f34cd32d
- Parent:
- 0:d563e74f0ae9
- Child:
- 2:e93021cfb0a9
File content as of revision 1:df68f34cd32d:
#include "mbed.h" #include "N5110.h" N5110::N5110(PinName pwrPin, PinName scePin, PinName rstPin, PinName dcPin, PinName mosiPin, PinName sclkPin, PinName ledPin) { spi = new SPI(mosiPin,NC,sclkPin); // create new SPI instance and initialise initSPI(); led = new PwmOut(ledPin); pwr = new DigitalOut(pwrPin); sce = new DigitalOut(scePin); rst = new DigitalOut(rstPin); dc = new DigitalOut(dcPin); } void N5110::init() { turnOn(); // power up reset(); // reset LCD - must be done within 100 ms // function set - extended sendCommand(0x20 | CMD_FS_ACTIVE_MODE | CMD_FS_HORIZONTAL_MODE | CMD_FS_EXTENDED_MODE); sendCommand(CMD_VOP_7V38); // operating voltage - these values are from Chris Yan's Library sendCommand(CMD_TC_TEMP_2); // temperature control sendCommand(CMD_BI_MUX_48); // bias // function set - basic sendCommand(0x20 | CMD_FS_ACTIVE_MODE | CMD_FS_HORIZONTAL_MODE | CMD_FS_BASIC_MODE); normalMode(); // normal video mode by default sendCommand(CMD_DC_NORMAL_MODE); // black on white //sendCommand(CMD_DC_INVERT_VIDEO); // white on black // RAM is undefined at power-up so clear clearRAM(); } // sets normal video mode (black on white) void N5110::normalMode() { sendCommand(CMD_DC_NORMAL_MODE); } // sets normal video mode (white on black) void N5110::inverseMode() { sendCommand(CMD_DC_INVERT_VIDEO); } // function to power up the LCD and backlight void N5110::turnOn() { // set brightness of LED - 0.0 to 1.0 - default is 50% setBrightness(0.5); pwr->write(1); // apply power } // function to power down LCD void N5110::turnOff() { setBrightness(0.0); // turn backlight off clearRAM(); // clear RAM to ensure specified current consumption sendCommand(0x20 | CMD_FS_ACTIVE_MODE | CMD_FS_HORIZONTAL_MODE | CMD_FS_BASIC_MODE); sendCommand(CMD_DC_CLEAR_DISPLAY); sendCommand(0x20 | CMD_FS_POWER_DOWN_MODE | CMD_FS_HORIZONTAL_MODE | CMD_FS_EXTENDED_MODE); pwr->write(0); } // function to change LED backlight brightness void N5110::setBrightness(float brightness) { // check whether brightness is within range if (brightness < 0.0) brightness = 0.0; if (brightness > 1.0) brightness = 1.0; // set PWM duty cycle led->write(brightness); } // pulse the active low reset line void N5110::reset() { 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 } 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) } 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) } // this function writes 0 to the 504 bytes to clear the RAM void N5110::clearRAM() { int i; sce->write(0); //set CE low to begin frame for(i = 0; i < 504; i++) { // 48 x 84 bits = 504 bytes spi->write(0x00); // send 0's } sce->write(1); // set CE high to end frame } void N5110::setXYAddress(int x, int y) { // check whether address is in range if (x > 83) x=83; if (y > 5) y=5; sendCommand(0x80 | x); sendCommand(0x40 | y); } void N5110::setPixel(int x, int y) { // calculate bank and shift 1 to required position buffer[x][y/8] |= (1 << y%8); } void N5110::clearPixel(int x, int y) { // calculate bank and shift 1 to required position (using bit clear) buffer[x][y/8] &= ~(1 << y%8); } unsigned char N5110::getPixel(int x, int y) { // return relevant bank and mask required bit return buffer[x][y/8] & (1 << y%8); } void N5110::refreshDisplay() { int i,j; sce->write(0); //set CE low to begin frame for(j = 0; j < 6; j++) { // be careful to use correct order (j,i) for horizontal addressing for(i = 0; i < 84; i++) { spi->write(buffer[i][j]); // send buffer } } sce->write(1); // set CE high to end frame } void N5110::randomiseBuffer() { int i,j; for(j = 0; j < 6; j++) { // be careful to use correct order (j,i) for horizontal addressing for(i = 0; i < 84; i++) { buffer[i][j] = rand()%256; // generate random byte } } } // function to print 5x7 font void N5110::printChar(char c) { // loop through 5 columns for (int j = 0; j < 5 ; j++ ) { sendData(font5x7[(c - 32)*5 + j]); // array is offset by 32 relative to ASCII, each character is 5 pixels wide } sendData(0); // send an empty byte to introduce space between characters } // function to print string at specified position void N5110::printString(const char * str,int x,int y) { int n = 0 ; // counter for number of characters in string // loop through string and print character while(*str) { setXYAddress(x+6*n,y); // leave 1 pixel (6 = 5 + 1) between each character printChar(*str); str++; // go to next character in string n++; // increment index } } void N5110::clear() { clearBuffer(); refreshDisplay(); } void N5110::clearBuffer() { int i,j; for (i=0; i<84; i++) { for (j=0; j<6; j++) { buffer[i][j]=0; } } }