Yang Junyao 201090191
Diff: N5110.cpp
- Revision:
- 24:342bdb6679a1
- Parent:
- 23:eb7e6632fc9e
- Child:
- 26:36be85c20ef4
--- a/N5110.cpp Wed Feb 01 16:26:22 2017 +0000 +++ b/N5110.cpp Tue Feb 07 10:21:43 2017 +0000 @@ -12,16 +12,13 @@ // 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) { - 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); - - clearBuffer(); + 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); } // overloaded constructor does not include power pin - LCD Vcc must be tied to +3V3 @@ -29,121 +26,118 @@ // drive the LCD. N5110::N5110(PinName scePin, PinName rstPin, PinName dcPin, PinName mosiPin, PinName sclkPin, PinName ledPin) { - spi = new SPI(mosiPin,NC,sclkPin); // create new SPI instance and initialise - // set up pins as required - pwr = NULL; - led = new PwmOut(ledPin); - sce = new DigitalOut(scePin); - rst = new DigitalOut(rstPin); - dc = new DigitalOut(dcPin); - - clearBuffer(); - + 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); } // initialise function - powers up and sends the initialisation commands void N5110::init() { - turnOn(); // power up - reset(); // reset LCD - must be done within 100 ms + turnOn(); // power up + reset(); // reset LCD - must be done within 100 ms - initSPI(); - // function set - extended - sendCommand(0x20 | CMD_FS_ACTIVE_MODE | CMD_FS_HORIZONTAL_MODE | CMD_FS_EXTENDED_MODE); - //printf("*"); - // Don't completely understand these parameters - they seem to work as they are - // Consult the datasheet if you need to change them - 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 + initSPI(); + // function set - extended + sendCommand(0x20 | CMD_FS_ACTIVE_MODE | CMD_FS_HORIZONTAL_MODE | CMD_FS_EXTENDED_MODE); + // Don't completely understand these parameters - they seem to work as they are + // Consult the datasheet if you need to change them + 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); // changing this can sometimes improve the contrast on some displays - // 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 + // 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 - // RAM is undefined at power-up so clear - clearRAM(); - clear(); - setBrightness(0.5); + clearRAM(); // RAM is undefined at power-up so clear + clear(); // clear buffer + setBrightness(0.5); } // sets normal video mode (black on white) void N5110::normalMode() { - sendCommand(CMD_DC_NORMAL_MODE); + sendCommand(CMD_DC_NORMAL_MODE); } // sets normal video mode (white on black) void N5110::inverseMode() { - sendCommand(CMD_DC_INVERT_VIDEO); + sendCommand(CMD_DC_INVERT_VIDEO); } -// function to power up the LCD and backlight +// 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 + } } // function to power down LCD void N5110::turnOff() { - setBrightness(0.0); // turn backlight off - clearRAM(); // clear RAM to ensure specified current consumption - // send command to ensure we are in basic mode - sendCommand(0x20 | CMD_FS_ACTIVE_MODE | CMD_FS_HORIZONTAL_MODE | CMD_FS_BASIC_MODE); - // clear the display - sendCommand(CMD_DC_CLEAR_DISPLAY); - // enter the extended mode and power down - sendCommand(0x20 | CMD_FS_POWER_DOWN_MODE | CMD_FS_HORIZONTAL_MODE | CMD_FS_EXTENDED_MODE); - // small delay and then turn off the power pin - wait_ms(10); + clear(); // clear buffer + refresh(); + setBrightness(0.0); // turn backlight off + clearRAM(); // clear RAM to ensure specified current consumption + // send command to ensure we are in basic mode + sendCommand(0x20 | CMD_FS_ACTIVE_MODE | CMD_FS_HORIZONTAL_MODE | CMD_FS_BASIC_MODE); + // clear the display + sendCommand(CMD_DC_CLEAR_DISPLAY); + // enter the extended mode and power down + sendCommand(0x20 | CMD_FS_POWER_DOWN_MODE | CMD_FS_HORIZONTAL_MODE | CMD_FS_EXTENDED_MODE); + // small delay and then turn off the power pin + 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 we are powering the LCD using the GPIO then make it low to turn off + if (pwr != NULL) { + pwr->write(0); // turn off power + } } // function to change LED backlight brightness void N5110::setBrightness(float brightness) { - // check whether brightness is within range - if (brightness < 0.0f) - brightness = 0.0f; - if (brightness > 1.0f) - brightness = 1.0f; - // set PWM duty cycle - led->write(brightness); + // check whether brightness is within range + if (brightness < 0.0f) + brightness = 0.0f; + if (brightness > 1.0f) + brightness = 1.0f; + // 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); + 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) } @@ -152,29 +146,29 @@ // 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 - for(int i = 0; i < WIDTH * HEIGHT; i++) { // 48 x 84 bits = 504 bytes - spi->write(0x00); // send 0's - } - sce->write(1); // set CE high to end 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 + } + 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) { - if (x>=0 && x<WIDTH && y>=0 && y<HEIGHT) { // check within range - sendCommand(0x80 | x); // send addresses to display with relevant mask - sendCommand(0x40 | y); - } + if (x>=0 && x<WIDTH && y>=0 && y<HEIGHT) { // check within range + sendCommand(0x80 | x); // send addresses to display with relevant mask + sendCommand(0x40 | y); + } } // These functions are used to set, clear and get the value of pixels in the display @@ -182,47 +176,52 @@ // function must be called after set and clear in order to update the display void N5110::setPixel(int x, int y) { - if (x>=0 && x<WIDTH && y>=0 && y<HEIGHT) { // check within range - // calculate bank and shift 1 to required position in the data byte - buffer[x][y/8] |= (1 << y%8); - } + if (x>=0 && x<WIDTH && y>=0 && 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) { - if (x>=0 && x<WIDTH && y>=0 && y<HEIGHT) { // check within range - // calculate bank and shift 1 to required position (using bit clear) - buffer[x][y/8] &= ~(1 << y%8); - } + if (x>=0 && x<WIDTH && y>=0 && 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) { - if (x>=0 && x<WIDTH && y>=0 && y<HEIGHT) { // check within range - // return relevant bank and mask required bit - return (int) buffer[x][y/8] & (1 << y%8); - // note this does not necessarily return 1 - a non-zero number represents a pixel - } else { + if (x>=0 && x<WIDTH && y>=0 && y<HEIGHT) { // check within range + // return relevant bank and mask required bit + + int pixel = (int) buffer[x][y/8] & (1 << y%8); + + if (pixel) + return 1; + else + return 0; + } + return 0; - } + } // function to refresh the display void N5110::refresh() { + setXYAddress(0,0); // important to set address back to 0,0 before refreshing display + // address auto increments after printing string, so buffer[0][0] will not coincide + // with top-left pixel after priting string - setXYAddress(0,0); // important to set address back to 0,0 before refreshing display - // 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 + 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 + } } - } - sce->write(1); // set CE high to end frame + sce->write(1); // set CE high to end frame } @@ -230,199 +229,172 @@ // The rand() function isn't seeded so it probably creates the same pattern everytime void N5110::randomiseBuffer() { - int i,j; - for(j = 0; j < BANKS; j++) { // be careful to use correct order (j,i) for horizontal addressing - for(i = 0; i < WIDTH; i++) { - buffer[i][j] = rand()%256; // generate random byte + int i,j; + for(j = 0; j < BANKS; j++) { // be careful to use correct order (j,i) for horizontal addressing + for(i = 0; i < WIDTH; i++) { + buffer[i][j] = rand()%256; // generate random byte + } } - } } // function to print 5x7 font void N5110::printChar(char c,int x,int y) { - if (y>=0 && y<BANKS) { // check if printing in range of y banks + if (y>=0 && y<BANKS) { // check if printing in range of y banks - for (int i = 0; i < 5 ; i++ ) { - int pixel_x = x+i; - if (pixel_x > WIDTH-1) // ensure pixel isn't outside the buffer size (0 - 83) - break; - buffer[pixel_x][y] = font5x7[(c - 32)*5 + i]; - // array is offset by 32 relative to ASCII, each character is 5 pixels wide + for (int i = 0; i < 5 ; i++ ) { + int pixel_x = x+i; + if (pixel_x > WIDTH-1) // ensure pixel isn't outside the buffer size (0 - 83) + break; + buffer[pixel_x][y] = font5x7[(c - 32)*5 + i]; + // array is offset by 32 relative to ASCII, each character is 5 pixels wide + } + } - - refresh(); // this sends the buffer to the display and sets address (cursor) back to 0,0 - } } // function to print string at specified position void N5110::printString(const char * str,int x,int y) { - if (y>=0 && y<BANKS) { // check if printing in range of y banks + if (y>=0 && 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 - while(*str) { + int n = 0 ; // counter for number of characters in string + // loop through string and print character + while(*str) { - // writes the character bitmap data to the buffer, so that - // text and pixels can be displayed at the same time - for (int i = 0; i < 5 ; i++ ) { - int pixel_x = x+i+n*6; - if (pixel_x > WIDTH-1) // ensure pixel isn't outside the buffer size (0 - 83) - break; - buffer[pixel_x][y] = font5x7[(*str - 32)*5 + i]; - } - - str++; // go to next character in string - - n++; // increment index - + // writes the character bitmap data to the buffer, so that + // text and pixels can be displayed at the same time + for (int i = 0; i < 5 ; i++ ) { + int pixel_x = x+i+n*6; + if (pixel_x > WIDTH-1) // ensure pixel isn't outside the buffer size (0 - 83) + break; + buffer[pixel_x][y] = font5x7[(*str - 32)*5 + i]; + } + str++; // go to next character in string + n++; // increment index + } } - - refresh(); // this sends the buffer to the display and sets address (cursor) back to 0,0 - } } -// function to clear the screen +// function to clear the screen buffer void N5110::clear() { - clearBuffer(); // clear the buffer then call the refresh function - refresh(); -} - -// function to clear the buffer -void N5110::clearBuffer() -{ - memset(buffer,0,sizeof(buffer)); - - /*int i,j; - for (i=0; i<WIDTH; i++) { // loop through the banks and set the buffer to 0 - for (j=0; j<BANKS; j++) { - buffer[i][j]=0; - } - } - */ + memset(buffer,0,sizeof(buffer)); } // function to plot array on display void N5110::plotArray(float array[]) { - - for (int i=0; i<WIDTH; i++) { // loop through array - // elements are normalised from 0.0 to 1.0, so multiply - // by 47 to convert to pixel range, and subtract from 47 - // since top-left is 0,0 in the display geometry - setPixel(i,47 - int(array[i]*47.0f)); - } - - refresh(); + for (int i=0; i<WIDTH; i++) { // loop through array + // elements are normalised from 0.0 to 1.0, so multiply + // by 47 to convert to pixel range, and subtract from 47 + // since top-left is 0,0 in the display geometry + setPixel(i,47 - int(array[i]*47.0f)); + } } // function to draw circle void N5110:: drawCircle(int x0,int y0,int radius,int fill) { - // from http://en.wikipedia.org/wiki/Midpoint_circle_algorithm - int x = radius; - int y = 0; - int radiusError = 1-x; + // from http://en.wikipedia.org/wiki/Midpoint_circle_algorithm + int x = radius; + int y = 0; + int radiusError = 1-x; - while(x >= y) { + while(x >= y) { - // if transparent, just draw outline - if (fill == 0) { - setPixel( x + x0, y + y0); - setPixel(-x + x0, y + y0); - setPixel( y + x0, x + y0); - setPixel(-y + x0, x + y0); - setPixel(-y + x0, -x + y0); - setPixel( y + x0, -x + y0); - setPixel( x + x0, -y + y0); - setPixel(-x + x0, -y + y0); - } else { // drawing filled circle, so draw lines between points at same y value + // if transparent, just draw outline + if (fill == 0) { + setPixel( x + x0, y + y0); + setPixel(-x + x0, y + y0); + setPixel( y + x0, x + y0); + setPixel(-y + x0, x + y0); + setPixel(-y + x0, -x + y0); + setPixel( y + x0, -x + y0); + setPixel( x + x0, -y + y0); + setPixel(-x + x0, -y + y0); + } else { // drawing filled circle, so draw lines between points at same y value - int type = (fill==1) ? 1:0; // black or white fill + int type = (fill==1) ? 1:0; // black or white fill - drawLine(x+x0,y+y0,-x+x0,y+y0,type); - drawLine(y+x0,x+y0,-y+x0,x+y0,type); - drawLine(y+x0,-x+y0,-y+x0,-x+y0,type); - drawLine(x+x0,-y+y0,-x+x0,-y+y0,type); - } - + drawLine(x+x0,y+y0,-x+x0,y+y0,type); + drawLine(y+x0,x+y0,-y+x0,x+y0,type); + drawLine(y+x0,-x+y0,-y+x0,-x+y0,type); + drawLine(x+x0,-y+y0,-x+x0,-y+y0,type); + } - y++; - if (radiusError<0) { - radiusError += 2 * y + 1; - } else { - x--; - radiusError += 2 * (y - x) + 1; + y++; + if (radiusError<0) { + radiusError += 2 * y + 1; + } else { + x--; + radiusError += 2 * (y - x) + 1; + } } - } } void N5110::drawLine(int x0,int y0,int x1,int y1,int type) { - int y_range = y1-y0; // calc range of y and x - int x_range = x1-x0; - int start,stop,step; + int y_range = y1-y0; // calc range of y and x + int x_range = x1-x0; + int start,stop,step; - // if dotted line, set step to 2, else step is 1 - step = (type==2) ? 2:1; + // if dotted line, set step to 2, else step is 1 + step = (type==2) ? 2:1; - // make sure we loop over the largest range to get the most pixels on the display - // for instance, if drawing a vertical line (x_range = 0), we need to loop down the y pixels - // or else we'll only end up with 1 pixel in the x column - if ( abs(x_range) > abs(y_range) ) { + // make sure we loop over the largest range to get the most pixels on the display + // for instance, if drawing a vertical line (x_range = 0), we need to loop down the y pixels + // or else we'll only end up with 1 pixel in the x column + if ( abs(x_range) > abs(y_range) ) { - // ensure we loop from smallest to largest or else for-loop won't run as expected - start = x1>x0 ? x0:x1; - stop = x1>x0 ? x1:x0; + // ensure we loop from smallest to largest or else for-loop won't run as expected + start = x1>x0 ? x0:x1; + stop = x1>x0 ? x1:x0; - // loop between x pixels - for (int x = start; x<= stop ; x+=step) { - // do linear interpolation - int y = y0 + (y1-y0)*(x-x0)/(x1-x0); + // loop between x pixels + for (int x = start; x<= stop ; x+=step) { + // do linear interpolation + int y = y0 + (y1-y0)*(x-x0)/(x1-x0); - if (type == 0) // if 'white' line, turn off pixel - clearPixel(x,y); - else - setPixel(x,y); // else if 'black' or 'dotted' turn on pixel - } - } else { + if (type == 0) // if 'white' line, turn off pixel + clearPixel(x,y); + else + setPixel(x,y); // else if 'black' or 'dotted' turn on pixel + } + } else { - // ensure we loop from smallest to largest or else for-loop won't run as expected - start = y1>y0 ? y0:y1; - stop = y1>y0 ? y1:y0; + // ensure we loop from smallest to largest or else for-loop won't run as expected + start = y1>y0 ? y0:y1; + stop = y1>y0 ? y1:y0; - for (int y = start; y<= stop ; y+=step) { - // do linear interpolation - int x = x0 + (x1-x0)*(y-y0)/(y1-y0); + for (int y = start; y<= stop ; y+=step) { + // do linear interpolation + int x = x0 + (x1-x0)*(y-y0)/(y1-y0); - if (type == 0) // if 'white' line, turn off pixel - clearPixel(x,y); - else - setPixel(x,y); // else if 'black' or 'dotted' turn on pixel + if (type == 0) // if 'white' line, turn off pixel + clearPixel(x,y); + else + setPixel(x,y); // else if 'black' or 'dotted' turn on pixel + } } - } } void N5110::drawRect(int x0,int y0,int width,int height,int fill) { - - if (fill == 0) { // transparent, just outline - drawLine(x0,y0,x0+width,y0,1); // top - drawLine(x0,y0+height,x0+width,y0+height,1); // bottom - drawLine(x0,y0,x0,y0+height,1); // left - drawLine(x0+width,y0,x0+width,y0+height,1); // right - } else { // filled rectangle - int type = (fill==1) ? 1:0; // black or white fill - for (int y = y0; y<= y0+height; y++) { // loop through rows of rectangle - drawLine(x0,y,x0+width,y,type); // draw line across screen + if (fill == 0) { // transparent, just outline + drawLine(x0,y0,x0+width,y0,1); // top + drawLine(x0,y0+height,x0+width,y0+height,1); // bottom + drawLine(x0,y0,x0,y0+height,1); // left + drawLine(x0+width,y0,x0+width,y0+height,1); // right + } else { // filled rectangle + int type = (fill==1) ? 1:0; // black or white fill + for (int y = y0; y<= y0+height; y++) { // loop through rows of rectangle + drawLine(x0,y,x0+width,y,type); // draw line across screen + } } - } - }