Allen Litton / ST7565R

A ST7565R display driver written with backbuffering capabilities. Model used and tested: NHD-C12832A1Z-FSW-FBW-3V3

Dependents:   xivelyboard

ST7565R.cpp@0:59cb20947fd6, 2011-08-11 (annotated)

Committer:
celeritous
Date:
Thu Aug 11 16:00:05 2011 +0000
Revision:
0:59cb20947fd6
Added doxygen tags.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
celeritous 0:59cb20947fd6 1
celeritous 0:59cb20947fd6 2 #include "ST7565R.h"
celeritous 0:59cb20947fd6 3 #include "mbed.h"
celeritous 0:59cb20947fd6 4
celeritous 0:59cb20947fd6 5 ST7565R::ST7565R(PinName cs, PinName a0, PinName scl, PinName si, PinName rst, bool BackBuffer) : _cs(cs), _a0(a0), _spi(si, NC, scl), _rst(rst)
celeritous 0:59cb20947fd6 6 {
celeritous 0:59cb20947fd6 7 _spi.format(8,3);
celeritous 0:59cb20947fd6 8 _spi.frequency(20000000); //datasheet 50 ns sclk
celeritous 0:59cb20947fd6 9 _rst=1;
celeritous 0:59cb20947fd6 10 _a0=0;
celeritous 0:59cb20947fd6 11 _cs=1;
celeritous 0:59cb20947fd6 12 scr=1;
celeritous 0:59cb20947fd6 13 reset();
celeritous 0:59cb20947fd6 14 UsingBackBuffer = BackBuffer;
celeritous 0:59cb20947fd6 15 }
celeritous 0:59cb20947fd6 16
celeritous 0:59cb20947fd6 17 void ST7565R::reset()
celeritous 0:59cb20947fd6 18 {
celeritous 0:59cb20947fd6 19 _rst = 0;
celeritous 0:59cb20947fd6 20 wait_ms(1);
celeritous 0:59cb20947fd6 21 _rst = 1;
celeritous 0:59cb20947fd6 22 wait_ms(1);
celeritous 0:59cb20947fd6 23 command(0xA0);
celeritous 0:59cb20947fd6 24 command(0xAF);
celeritous 0:59cb20947fd6 25 command(0xC0);
celeritous 0:59cb20947fd6 26 command(0xA2);
celeritous 0:59cb20947fd6 27 command(0x2F);
celeritous 0:59cb20947fd6 28 command(0x24);
celeritous 0:59cb20947fd6 29 command(0x81);
celeritous 0:59cb20947fd6 30 command(0x00);
celeritous 0:59cb20947fd6 31 command(0xA7);
celeritous 0:59cb20947fd6 32
celeritous 0:59cb20947fd6 33
celeritous 0:59cb20947fd6 34 clearBuffer();
celeritous 0:59cb20947fd6 35
celeritous 0:59cb20947fd6 36 }
celeritous 0:59cb20947fd6 37 #define FONT_SIZE_X 6
celeritous 0:59cb20947fd6 38 #define FONT_SIZE_Y 8
celeritous 0:59cb20947fd6 39 void ST7565R::moveto(int col, int row)
celeritous 0:59cb20947fd6 40 {
celeritous 0:59cb20947fd6 41 _column = col;
celeritous 0:59cb20947fd6 42 _row = row;
celeritous 0:59cb20947fd6 43 }
celeritous 0:59cb20947fd6 44 void ST7565R::character(int column, int row, char c)
celeritous 0:59cb20947fd6 45 {
celeritous 0:59cb20947fd6 46 char v = c - 0x20;
celeritous 0:59cb20947fd6 47 if (c >= 0x20 && c < 0x80)
celeritous 0:59cb20947fd6 48 {
celeritous 0:59cb20947fd6 49 c-=0x20;
celeritous 0:59cb20947fd6 50 bitblt(column*FONT_SIZE_X,row*FONT_SIZE_Y,
celeritous 0:59cb20947fd6 51 FONT_SIZE_X, FONT_SIZE_Y, (char*)TEXT,
celeritous 0:59cb20947fd6 52 TEXT_WIDTH, TEXT_HEIGHT,
celeritous 0:59cb20947fd6 53 (v%0x10) * FONT_SIZE_X, (v/0x10)*FONT_SIZE_Y,BITBLT_SRCCOPY);
celeritous 0:59cb20947fd6 54 }
celeritous 0:59cb20947fd6 55 }
celeritous 0:59cb20947fd6 56 int ST7565R::_putc(int value) {
celeritous 0:59cb20947fd6 57 if (value == '\n') {
celeritous 0:59cb20947fd6 58 _column = 0;
celeritous 0:59cb20947fd6 59 _row++;
celeritous 0:59cb20947fd6 60 if (_row >= rows()) {
celeritous 0:59cb20947fd6 61 _row = 0;
celeritous 0:59cb20947fd6 62 }
celeritous 0:59cb20947fd6 63 } else {
celeritous 0:59cb20947fd6 64 character(_column, _row, value);
celeritous 0:59cb20947fd6 65 _column++;
celeritous 0:59cb20947fd6 66 if (_column >= columns()) {
celeritous 0:59cb20947fd6 67 _column = 0;
celeritous 0:59cb20947fd6 68 _row++;
celeritous 0:59cb20947fd6 69 if (_row >= rows()) {
celeritous 0:59cb20947fd6 70 _row = 0;
celeritous 0:59cb20947fd6 71 }
celeritous 0:59cb20947fd6 72 }
celeritous 0:59cb20947fd6 73 }
celeritous 0:59cb20947fd6 74 return value;
celeritous 0:59cb20947fd6 75 }
celeritous 0:59cb20947fd6 76
celeritous 0:59cb20947fd6 77 int ST7565R::rows() { return 4; }
celeritous 0:59cb20947fd6 78 int ST7565R::columns() { return 21; }
celeritous 0:59cb20947fd6 79 int ST7565R::_getc() {
celeritous 0:59cb20947fd6 80 return -1;
celeritous 0:59cb20947fd6 81 }
celeritous 0:59cb20947fd6 82
celeritous 0:59cb20947fd6 83
celeritous 0:59cb20947fd6 84 void ST7565R::clearBuffer()
celeritous 0:59cb20947fd6 85 {
celeritous 0:59cb20947fd6 86
celeritous 0:59cb20947fd6 87 char * screen =getDrawingScreen();
celeritous 0:59cb20947fd6 88 int i=512;
celeritous 0:59cb20947fd6 89 while(i--)
celeritous 0:59cb20947fd6 90 screen[i]=0xff;
celeritous 0:59cb20947fd6 91
celeritous 0:59cb20947fd6 92
celeritous 0:59cb20947fd6 93 if (!UsingBackBuffer)
celeritous 0:59cb20947fd6 94 swapBuffers(); //should just commit the white to memory
celeritous 0:59cb20947fd6 95 }
celeritous 0:59cb20947fd6 96 void ST7565R::setpixel(int x, int y)
celeritous 0:59cb20947fd6 97 {
celeritous 0:59cb20947fd6 98 if (x < 0 || x > 127) return;
celeritous 0:59cb20947fd6 99 if (y < 0 || y > 31) return;
celeritous 0:59cb20947fd6 100 char * screen = getDrawingScreen();
celeritous 0:59cb20947fd6 101 loc_t byte = { x , (y / 8) * 128};
celeritous 0:59cb20947fd6 102 screen[byte.y + byte.x] |= 0x80 >> (y%8);
celeritous 0:59cb20947fd6 103
celeritous 0:59cb20947fd6 104 //if theres no backbuffer,then we'll do our writes immediately
celeritous 0:59cb20947fd6 105 if (!UsingBackBuffer)
celeritous 0:59cb20947fd6 106 {
celeritous 0:59cb20947fd6 107 command(0xb0 | ( (3-(y/8))+scr*4));
celeritous 0:59cb20947fd6 108 command(0x10 | (x >> 4)); //column upper
celeritous 0:59cb20947fd6 109 command(0x00 | (x & 0x0f)); //column lower
celeritous 0:59cb20947fd6 110 data(screen[byte.y +byte.x]);
celeritous 0:59cb20947fd6 111 }
celeritous 0:59cb20947fd6 112 }
celeritous 0:59cb20947fd6 113
celeritous 0:59cb20947fd6 114 void ST7565R::clearpixel(int x, int y)
celeritous 0:59cb20947fd6 115 {
celeritous 0:59cb20947fd6 116 if (x < 0 || x > 127) return;
celeritous 0:59cb20947fd6 117 if (y < 0 || y > 31) return;
celeritous 0:59cb20947fd6 118 char * screen = getDrawingScreen();
celeritous 0:59cb20947fd6 119 loc_t byte = { x , (y / 8) * 128};
celeritous 0:59cb20947fd6 120 screen[byte.y + byte.x] &= ~(0x80 >> (y%8));
celeritous 0:59cb20947fd6 121
celeritous 0:59cb20947fd6 122 //if theres no backbuffer,then we'll do our writes immediately
celeritous 0:59cb20947fd6 123 if (!UsingBackBuffer)
celeritous 0:59cb20947fd6 124 {
celeritous 0:59cb20947fd6 125 command(0xb0 | ( (3-(y/8))+scr*4));
celeritous 0:59cb20947fd6 126 command(0x10 | (x >> 4)); //column upper
celeritous 0:59cb20947fd6 127 command(0x00 | (x & 0x0f)); //column lower
celeritous 0:59cb20947fd6 128 data(screen[byte.y +byte.x]);
celeritous 0:59cb20947fd6 129 }
celeritous 0:59cb20947fd6 130 }
celeritous 0:59cb20947fd6 131
celeritous 0:59cb20947fd6 132 void ST7565R::data(int value)
celeritous 0:59cb20947fd6 133 {
celeritous 0:59cb20947fd6 134 _cs = 0;
celeritous 0:59cb20947fd6 135 _a0 = 1;
celeritous 0:59cb20947fd6 136 _spi.write(value);
celeritous 0:59cb20947fd6 137 _cs = 1;
celeritous 0:59cb20947fd6 138
celeritous 0:59cb20947fd6 139 }
celeritous 0:59cb20947fd6 140 void ST7565R::command(int value)
celeritous 0:59cb20947fd6 141 {
celeritous 0:59cb20947fd6 142 _cs = 0;
celeritous 0:59cb20947fd6 143 _a0 = 0;
celeritous 0:59cb20947fd6 144 _spi.write(value);
celeritous 0:59cb20947fd6 145 _cs = 1;
celeritous 0:59cb20947fd6 146 }
celeritous 0:59cb20947fd6 147
celeritous 0:59cb20947fd6 148 void ST7565R::swapBuffers()
celeritous 0:59cb20947fd6 149 {
celeritous 0:59cb20947fd6 150 char * screen = getDrawingScreen();
celeritous 0:59cb20947fd6 151 for (int i=0; i<4; i++)
celeritous 0:59cb20947fd6 152 {
celeritous 0:59cb20947fd6 153
celeritous 0:59cb20947fd6 154 command(0xb0 | ( (3-i)+scr*4));
celeritous 0:59cb20947fd6 155 command(0x10);
celeritous 0:59cb20947fd6 156 command(0x00);
celeritous 0:59cb20947fd6 157 for (int j=0; j<128; j++)
celeritous 0:59cb20947fd6 158 {
celeritous 0:59cb20947fd6 159 data(screen[i*128+j]);
celeritous 0:59cb20947fd6 160 }
celeritous 0:59cb20947fd6 161 }
celeritous 0:59cb20947fd6 162 command(0x40 | scr * 32);
celeritous 0:59cb20947fd6 163 if (UsingBackBuffer) scr^=1;
celeritous 0:59cb20947fd6 164 }
celeritous 0:59cb20947fd6 165 #define SCREEN_1 0
celeritous 0:59cb20947fd6 166 #define SCREEN_2 1
celeritous 0:59cb20947fd6 167
celeritous 0:59cb20947fd6 168
celeritous 0:59cb20947fd6 169 char * ST7565R::getDrawingScreen()
celeritous 0:59cb20947fd6 170 {
celeritous 0:59cb20947fd6 171 if (scr)
celeritous 0:59cb20947fd6 172 return screen.screen1;
celeritous 0:59cb20947fd6 173 else
celeritous 0:59cb20947fd6 174 return screen.screen2;
celeritous 0:59cb20947fd6 175 }
celeritous 0:59cb20947fd6 176 void ST7565R::bitblt(int dstx, int dsty,
celeritous 0:59cb20947fd6 177 int blit_width, int blit_height,
celeritous 0:59cb20947fd6 178 char* img,
celeritous 0:59cb20947fd6 179 int img_width, int img_height,
celeritous 0:59cb20947fd6 180 int srcx, int srcy,
celeritous 0:59cb20947fd6 181 int format)
celeritous 0:59cb20947fd6 182 {
celeritous 0:59cb20947fd6 183 char * current_draw_buffer = getDrawingScreen();
celeritous 0:59cb20947fd6 184 bool pixel = 0;
celeritous 0:59cb20947fd6 185 int byte_size_wide = img_width / 8;
celeritous 0:59cb20947fd6 186 for (int i=0; i < blit_height; i++)
celeritous 0:59cb20947fd6 187 {
celeritous 0:59cb20947fd6 188 for (int j=0; j < blit_width; j++)
celeritous 0:59cb20947fd6 189 {
celeritous 0:59cb20947fd6 190 pixel = img[ byte_size_wide*(srcy+i) + (srcx+j)/8] & (0x80 >> ((srcx+j)%8));
celeritous 0:59cb20947fd6 191
celeritous 0:59cb20947fd6 192 switch(format)
celeritous 0:59cb20947fd6 193 {
celeritous 0:59cb20947fd6 194 case BITBLT_SRCCOPY: if (pixel) setpixel(dstx+j,dsty+i); else
celeritous 0:59cb20947fd6 195 clearpixel(dstx+j,dsty+i); break;
celeritous 0:59cb20947fd6 196 case BITBLT_SRCOR: if (pixel) setpixel(dstx+j,dsty+i); break;
celeritous 0:59cb20947fd6 197 case BITBLT_SRCAND: if (!pixel) clearpixel(dstx+j,dsty+i); break;
celeritous 0:59cb20947fd6 198 }
celeritous 0:59cb20947fd6 199 }
celeritous 0:59cb20947fd6 200 }
celeritous 0:59cb20947fd6 201
celeritous 0:59cb20947fd6 202 }