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Diff: N5110.cpp
- Revision:
- 0:d563e74f0ae9
- Child:
- 1:df68f34cd32d
diff -r 000000000000 -r d563e74f0ae9 N5110.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/N5110.cpp Sun Jan 26 18:55:16 2014 +0000 @@ -0,0 +1,218 @@ +#include "mbed.h" +#include "N5110.h" + +N5110::N5110(PinName pwrPin, PinName ledPin, PinName scePin, PinName rstPin, PinName dcPin, PinName mosiPin, PinName sclkPin) +{ + + 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 + + // function set - extended + sendCommand(0x20 | CMD_FS_ACTIVE_MODE | CMD_FS_HORIZONTAL_MODE | CMD_FS_EXTENDED_MODE); + + sendCommand(CMD_VOP_7V38); // operating voltage + 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); + sendCommand(CMD_DC_NORMAL_MODE); // black on white + //sendLCDCommand(CMD_DC_INVERT_VIDEO); // white on black + + // RAM is undefined at power-up so clear + clearRAM(); + +} + +// 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 + } + +} + +// 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; + } + } +} \ No newline at end of file