Fork of SSD1306 by
ssd1306.cpp@0:21cb91208386, 2013-02-05 (annotated)
- Committer:
- Byrn
- Date:
- Tue Feb 05 09:46:58 2013 +0000
- Revision:
- 0:21cb91208386
- Child:
- 1:1d58d378221c
[mbed] converted /OLED/SSD1306
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
Byrn | 0:21cb91208386 | 1 | |
Byrn | 0:21cb91208386 | 2 | #include "mbed.h" |
Byrn | 0:21cb91208386 | 3 | #include "ssd1306.h" |
Byrn | 0:21cb91208386 | 4 | |
Byrn | 0:21cb91208386 | 5 | SSD1306::SSD1306(PinName cs, PinName rs, PinName dc, PinName clk, PinName data) |
Byrn | 0:21cb91208386 | 6 | : _spi(data, NC, clk), _cs(cs), _reset(rs), _dc(dc) |
Byrn | 0:21cb91208386 | 7 | { |
Byrn | 0:21cb91208386 | 8 | } |
Byrn | 0:21cb91208386 | 9 | |
Byrn | 0:21cb91208386 | 10 | void SSD1306::set_low_column(int v) |
Byrn | 0:21cb91208386 | 11 | { |
Byrn | 0:21cb91208386 | 12 | _send_command(SSD1306_SETLOWCOLUMN | v); |
Byrn | 0:21cb91208386 | 13 | } |
Byrn | 0:21cb91208386 | 14 | |
Byrn | 0:21cb91208386 | 15 | void SSD1306::set_high_column(int v) |
Byrn | 0:21cb91208386 | 16 | { |
Byrn | 0:21cb91208386 | 17 | _send_command(SSD1306_SETHIGHCOLUMN | v); |
Byrn | 0:21cb91208386 | 18 | } |
Byrn | 0:21cb91208386 | 19 | |
Byrn | 0:21cb91208386 | 20 | void SSD1306::set_start_line(int v) |
Byrn | 0:21cb91208386 | 21 | { |
Byrn | 0:21cb91208386 | 22 | _send_command(SSD1306_SETSTARTLINE | v); |
Byrn | 0:21cb91208386 | 23 | } |
Byrn | 0:21cb91208386 | 24 | |
Byrn | 0:21cb91208386 | 25 | void SSD1306::off() |
Byrn | 0:21cb91208386 | 26 | { |
Byrn | 0:21cb91208386 | 27 | _send_command(SSD1306_DISPLAYOFF); |
Byrn | 0:21cb91208386 | 28 | } |
Byrn | 0:21cb91208386 | 29 | |
Byrn | 0:21cb91208386 | 30 | void SSD1306::on() |
Byrn | 0:21cb91208386 | 31 | { |
Byrn | 0:21cb91208386 | 32 | _send_command(SSD1306_DISPLAYON); |
Byrn | 0:21cb91208386 | 33 | } |
Byrn | 0:21cb91208386 | 34 | |
Byrn | 0:21cb91208386 | 35 | void SSD1306::invert(int i) |
Byrn | 0:21cb91208386 | 36 | { |
Byrn | 0:21cb91208386 | 37 | _send_command(i ? |
Byrn | 0:21cb91208386 | 38 | SSD1306_INVERTDISPLAY : |
Byrn | 0:21cb91208386 | 39 | SSD1306_NORMALDISPLAY); |
Byrn | 0:21cb91208386 | 40 | } |
Byrn | 0:21cb91208386 | 41 | |
Byrn | 0:21cb91208386 | 42 | void SSD1306::set_display_offset(int v) |
Byrn | 0:21cb91208386 | 43 | { |
Byrn | 0:21cb91208386 | 44 | _send_command(SSD1306_SETDISPLAYOFFSET); |
Byrn | 0:21cb91208386 | 45 | _send_command(v); |
Byrn | 0:21cb91208386 | 46 | } |
Byrn | 0:21cb91208386 | 47 | |
Byrn | 0:21cb91208386 | 48 | void SSD1306::initialise() |
Byrn | 0:21cb91208386 | 49 | { |
Byrn | 0:21cb91208386 | 50 | // Init |
Byrn | 0:21cb91208386 | 51 | _reset = 1; |
Byrn | 0:21cb91208386 | 52 | wait(0.01); |
Byrn | 0:21cb91208386 | 53 | _reset = 0; |
Byrn | 0:21cb91208386 | 54 | wait(0.10); |
Byrn | 0:21cb91208386 | 55 | _reset = 1; |
Byrn | 0:21cb91208386 | 56 | |
Byrn | 0:21cb91208386 | 57 | off(); |
Byrn | 0:21cb91208386 | 58 | |
Byrn | 0:21cb91208386 | 59 | set_low_column(0); |
Byrn | 0:21cb91208386 | 60 | set_high_column(0); |
Byrn | 0:21cb91208386 | 61 | set_start_line(0); |
Byrn | 0:21cb91208386 | 62 | |
Byrn | 0:21cb91208386 | 63 | _send_command(SSD1306_SETCONTRAST); |
Byrn | 0:21cb91208386 | 64 | _send_command(0xCF); // chargepump, could be 0x9F for external 9V |
Byrn | 0:21cb91208386 | 65 | |
Byrn | 0:21cb91208386 | 66 | _send_command(0xA1); // setment remap 95 to 0 (??) |
Byrn | 0:21cb91208386 | 67 | |
Byrn | 0:21cb91208386 | 68 | invert(0); |
Byrn | 0:21cb91208386 | 69 | |
Byrn | 0:21cb91208386 | 70 | _send_command(SSD1306_DISPLAYALLON_RESUME); |
Byrn | 0:21cb91208386 | 71 | _send_command(SSD1306_SETMULTIPLEX); |
Byrn | 0:21cb91208386 | 72 | _send_command(0x3F); // 1/64 duty |
Byrn | 0:21cb91208386 | 73 | |
Byrn | 0:21cb91208386 | 74 | set_display_offset(0); |
Byrn | 0:21cb91208386 | 75 | |
Byrn | 0:21cb91208386 | 76 | _send_command(SSD1306_SETDISPLAYCLOCKDIV); |
Byrn | 0:21cb91208386 | 77 | _send_command(0x80); // suggested value = 0x80 |
Byrn | 0:21cb91208386 | 78 | _send_command(SSD1306_SETPRECHARGE); |
Byrn | 0:21cb91208386 | 79 | _send_command(0xF1); // dc/dc, could be 0x22 for external 9V |
Byrn | 0:21cb91208386 | 80 | _send_command(SSD1306_SETCOMPINS); |
Byrn | 0:21cb91208386 | 81 | _send_command(0x12); // disable COM left/right remap |
Byrn | 0:21cb91208386 | 82 | _send_command(SSD1306_SETVCOMDETECT); |
Byrn | 0:21cb91208386 | 83 | _send_command(0x40); // apparently, 0x20 is default... |
Byrn | 0:21cb91208386 | 84 | _send_command(SSD1306_MEMORYMODE); |
Byrn | 0:21cb91208386 | 85 | _send_command(0x0); // act like KS0108 |
Byrn | 0:21cb91208386 | 86 | |
Byrn | 0:21cb91208386 | 87 | // left-to-right scan |
Byrn | 0:21cb91208386 | 88 | _send_command(SSD1306_SEGREMAP | 0x1); |
Byrn | 0:21cb91208386 | 89 | _send_command(SSD1306_COMSCANDEC); |
Byrn | 0:21cb91208386 | 90 | _send_command(SSD1306_CHARGEPUMP); |
Byrn | 0:21cb91208386 | 91 | _send_command(0x14); // disable, for external 9v 0x10 disable |
Byrn | 0:21cb91208386 | 92 | |
Byrn | 0:21cb91208386 | 93 | // turn it on |
Byrn | 0:21cb91208386 | 94 | on(); |
Byrn | 0:21cb91208386 | 95 | } |
Byrn | 0:21cb91208386 | 96 | |
Byrn | 0:21cb91208386 | 97 | void SSD1306::update() |
Byrn | 0:21cb91208386 | 98 | { |
Byrn | 0:21cb91208386 | 99 | set_low_column(0); |
Byrn | 0:21cb91208386 | 100 | set_high_column(0); |
Byrn | 0:21cb91208386 | 101 | set_start_line(0); |
Byrn | 0:21cb91208386 | 102 | |
Byrn | 0:21cb91208386 | 103 | for (int i = 0; i < 1024; i++) |
Byrn | 0:21cb91208386 | 104 | _send_data(_screen[i]); |
Byrn | 0:21cb91208386 | 105 | } |
Byrn | 0:21cb91208386 | 106 | |
Byrn | 0:21cb91208386 | 107 | void SSD1306::set_pixel(int x, int y) |
Byrn | 0:21cb91208386 | 108 | { |
Byrn | 0:21cb91208386 | 109 | if (x >= SSD1306_LCDWIDTH || y >= SSD1306_LCDHEIGHT) return; |
Byrn | 0:21cb91208386 | 110 | |
Byrn | 0:21cb91208386 | 111 | _screen[x + (y / 8) * 128] |= 1 << (y % 8); |
Byrn | 0:21cb91208386 | 112 | } |
Byrn | 0:21cb91208386 | 113 | |
Byrn | 0:21cb91208386 | 114 | void SSD1306::clear_pixel(int x, int y) |
Byrn | 0:21cb91208386 | 115 | { |
Byrn | 0:21cb91208386 | 116 | if (x >= SSD1306_LCDWIDTH || y >= SSD1306_LCDHEIGHT) return; |
Byrn | 0:21cb91208386 | 117 | |
Byrn | 0:21cb91208386 | 118 | _screen[x + (y / 8) * 128] &= ~(1 << (y % 8)); |
Byrn | 0:21cb91208386 | 119 | } |
Byrn | 0:21cb91208386 | 120 | |
Byrn | 0:21cb91208386 | 121 | void SSD1306::line(int x0, int y0, int x1, int y1) { |
Byrn | 0:21cb91208386 | 122 | int steep = abs(y1 - y0) > abs(x1 - x0); |
Byrn | 0:21cb91208386 | 123 | int t; |
Byrn | 0:21cb91208386 | 124 | |
Byrn | 0:21cb91208386 | 125 | if (steep) { |
Byrn | 0:21cb91208386 | 126 | t = x0; x0 = y0; y0 = t; |
Byrn | 0:21cb91208386 | 127 | t = x1; x1 = y1; y1 = t; |
Byrn | 0:21cb91208386 | 128 | } |
Byrn | 0:21cb91208386 | 129 | |
Byrn | 0:21cb91208386 | 130 | if (x0 > x1) { |
Byrn | 0:21cb91208386 | 131 | t = x0; x0 = x1; x1 = t; |
Byrn | 0:21cb91208386 | 132 | t = y0; y0 = y1; y1 = t; |
Byrn | 0:21cb91208386 | 133 | } |
Byrn | 0:21cb91208386 | 134 | |
Byrn | 0:21cb91208386 | 135 | int dx, dy; |
Byrn | 0:21cb91208386 | 136 | |
Byrn | 0:21cb91208386 | 137 | dx = x1 - x0; |
Byrn | 0:21cb91208386 | 138 | dy = abs(y1 - y0); |
Byrn | 0:21cb91208386 | 139 | |
Byrn | 0:21cb91208386 | 140 | int err = dx / 2; |
Byrn | 0:21cb91208386 | 141 | int ystep; |
Byrn | 0:21cb91208386 | 142 | |
Byrn | 0:21cb91208386 | 143 | if (y0 < y1) { |
Byrn | 0:21cb91208386 | 144 | ystep = 1; |
Byrn | 0:21cb91208386 | 145 | } else { |
Byrn | 0:21cb91208386 | 146 | ystep = -1;} |
Byrn | 0:21cb91208386 | 147 | |
Byrn | 0:21cb91208386 | 148 | for (; x0<x1; x0++) { |
Byrn | 0:21cb91208386 | 149 | if (steep) { |
Byrn | 0:21cb91208386 | 150 | set_pixel(y0, x0); |
Byrn | 0:21cb91208386 | 151 | } else { |
Byrn | 0:21cb91208386 | 152 | set_pixel(x0, y0); |
Byrn | 0:21cb91208386 | 153 | } |
Byrn | 0:21cb91208386 | 154 | err -= dy; |
Byrn | 0:21cb91208386 | 155 | if (err < 0) { |
Byrn | 0:21cb91208386 | 156 | y0 += ystep; |
Byrn | 0:21cb91208386 | 157 | err += dx; |
Byrn | 0:21cb91208386 | 158 | } |
Byrn | 0:21cb91208386 | 159 | } |
Byrn | 0:21cb91208386 | 160 | } |
Byrn | 0:21cb91208386 | 161 | |
Byrn | 0:21cb91208386 | 162 | void SSD1306::draw_string(char *font, int x, int y, const char *string) |
Byrn | 0:21cb91208386 | 163 | { |
Byrn | 0:21cb91208386 | 164 | _cursor_x = x; |
Byrn | 0:21cb91208386 | 165 | _cursor_y = y; |
Byrn | 0:21cb91208386 | 166 | |
Byrn | 0:21cb91208386 | 167 | for (int i = 0; i < strlen(string); i++) |
Byrn | 0:21cb91208386 | 168 | draw_char(font, _cursor_x, _cursor_y, string[i]); |
Byrn | 0:21cb91208386 | 169 | } |
Byrn | 0:21cb91208386 | 170 | |
Byrn | 0:21cb91208386 | 171 | void SSD1306::draw_char(char *font, int x, int y, char c) |
Byrn | 0:21cb91208386 | 172 | { |
Byrn | 0:21cb91208386 | 173 | int height = font[FONT_HEIGHT_OFFSET]; |
Byrn | 0:21cb91208386 | 174 | int max_width = font[FONT_SIZE_OFFSET]; |
Byrn | 0:21cb91208386 | 175 | int char_size_bytes = max_width * height + 1; |
Byrn | 0:21cb91208386 | 176 | int char_width = font[(c - FONT_START) * char_size_bytes + FONT_DATA_OFFSET]; |
Byrn | 0:21cb91208386 | 177 | for (int i = 0; i < char_width; i++) |
Byrn | 0:21cb91208386 | 178 | _screen[(x + i) + (y * SSD1306_LCDWIDTH)] = font[(c - FONT_START) * (char_size_bytes) + i + FONT_DATA_OFFSET + 1]; |
Byrn | 0:21cb91208386 | 179 | |
Byrn | 0:21cb91208386 | 180 | _cursor_x = x + char_width; |
Byrn | 0:21cb91208386 | 181 | _cursor_y = y; |
Byrn | 0:21cb91208386 | 182 | } |
Byrn | 0:21cb91208386 | 183 | |
Byrn | 0:21cb91208386 | 184 | void SSD1306::clear() |
Byrn | 0:21cb91208386 | 185 | { |
Byrn | 0:21cb91208386 | 186 | for (int i = 0; i < 1024; i++) |
Byrn | 0:21cb91208386 | 187 | _screen[i] = 0; |
Byrn | 0:21cb91208386 | 188 | } |
Byrn | 0:21cb91208386 | 189 | |
Byrn | 0:21cb91208386 | 190 | void SSD1306::_send_command(int code) |
Byrn | 0:21cb91208386 | 191 | { |
Byrn | 0:21cb91208386 | 192 | _cs = 1; |
Byrn | 0:21cb91208386 | 193 | _dc = 0; |
Byrn | 0:21cb91208386 | 194 | _cs = 0; |
Byrn | 0:21cb91208386 | 195 | _spi.write(code); |
Byrn | 0:21cb91208386 | 196 | _cs = 1; |
Byrn | 0:21cb91208386 | 197 | } |
Byrn | 0:21cb91208386 | 198 | |
Byrn | 0:21cb91208386 | 199 | void SSD1306::_send_data(int value) |
Byrn | 0:21cb91208386 | 200 | { |
Byrn | 0:21cb91208386 | 201 | _cs = 1; |
Byrn | 0:21cb91208386 | 202 | _dc = 1; |
Byrn | 0:21cb91208386 | 203 | _cs = 0; |
Byrn | 0:21cb91208386 | 204 | _spi.write(value); |
Byrn | 0:21cb91208386 | 205 | _cs = 1; |
Byrn | 0:21cb91208386 | 206 | } |
Byrn | 0:21cb91208386 | 207 |