Simple library for interfacing to Nokia 5110 LCD display (as found on the SparkFun website).
Fork of N5110 by
Diff: N5110.cpp
- Revision:
- 17:780a542d5f8b
- Parent:
- 15:ee645611ff94
- Child:
- 18:1af393359298
diff -r b37a3a260598 -r 780a542d5f8b N5110.cpp --- a/N5110.cpp Tue Mar 10 19:33:55 2015 +0000 +++ b/N5110.cpp Tue Mar 17 12:56:03 2015 +0000 @@ -139,7 +139,7 @@ { int i; sce->write(0); //set CE low to begin frame - for(i = 0; i < 504; i++) { // 48 x 84 bits = 504 bytes + for(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 @@ -149,18 +149,10 @@ // function to set the XY address in RAM for subsequenct data write void N5110::setXYAddress(int x, int y) { - // check whether address is in range - if (x > 83) - x=83; - if (y > 5) - y=5; - if (x < 0) - x=0; - if (y < 0) - y=0; - - 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 @@ -168,21 +160,28 @@ // function must be called after set and clear in order to update the display void N5110::setPixel(int x, int y) { - // 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) { - // 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) { - // return relevant bank and mask required bit - return (int) buffer[x][y/8] & (1 << y%8); - + 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); + } else { + return 0; + } } // function to refresh the display @@ -196,8 +195,8 @@ 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++) { + for(j = 0; j < BANKS; j++) { // be careful to use correct order (j,i) for horizontal addressing + for(i = 0; i < WIDTH; i++) { spi->write(buffer[i][j]); // send buffer } } @@ -210,8 +209,8 @@ 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++) { + 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 } } @@ -223,10 +222,10 @@ { for (int i = 0; i < 5 ; i++ ) { buffer[x+i][y] = font5x7[(c - 32)*5 + i]; - // array is offset by 32 relative to ASCII, each character is 5 pixels wide + // 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 + + refresh(); // this sends the buffer to the display and sets address (cursor) back to 0,0 } // function to print string at specified position @@ -261,8 +260,8 @@ void N5110::clearBuffer() { int i,j; - for (i=0; i<84; i++) { // loop through the banks and set the buffer to 0 - for (j=0; j<6; 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; } } @@ -274,7 +273,7 @@ int i; - for (i=0; i<84; i++) { // loop through array + for (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 @@ -283,5 +282,113 @@ refresh(); +} -} \ No newline at end of file +// 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; + + 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 + + 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); + } + + + y++; + if (radiusError<0) { + radiusError += 2 * y + 1; + } else { + x--; + radiusError += 2 * (y - x) + 1; + } + } + + refresh(); +} + +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; + + // 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) ) { + + // 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); + + 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; + + 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 + + } + } + + refresh(); +} + +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 + } + } + +}