hw/ssd0303.c

   1 /*
   2  * SSD0303 OLED controller with OSRAM Pictiva 96x16 display.
   3  *
   4  * Copyright (c) 2006-2007 CodeSourcery.
   5  * Written by Paul Brook
   6  *
   7  * This code is licenced under the GPL.
   8  */
   9
  10 /* The controller can support a variety of different displays, but we only
  11    implement one.  Most of the commends relating to brightness and geometry
  12    setup are ignored. */
  13 #include "hw.h"
  14 #include "i2c.h"
  15 #include "console.h"
  16
  17 //#define DEBUG_SSD0303 1
  18
  19 #ifdef DEBUG_SSD0303
  20 #define DPRINTF(fmt, args...) \
  21 do { printf("ssd0303: " fmt , ##args); } while (0)
  22 #define BADF(fmt, args...) \
  23 do { fprintf(stderr, "ssd0303: error: " fmt , ##args); exit(1);} while (0)
  24 #else
  25 #define DPRINTF(fmt, args...) do {} while(0)
  26 #define BADF(fmt, args...) \
  27 do { fprintf(stderr, "ssd0303: error: " fmt , ##args);} while (0)
  28 #endif
  29
  30 /* Scaling factor for pixels.  */
  31 #define MAGNIFY 4
  32
  33 enum ssd0303_mode
  34 {
  35     SSD0303_IDLE,
  36     SSD0303_DATA,
  37     SSD0303_CMD
  38 };
  39
  40 enum ssd0303_cmd {
  41     SSD0303_CMD_NONE,
  42     SSD0303_CMD_SKIP1
  43 };
  44
  45 typedef struct {
  46     i2c_slave i2c;
  47     DisplayState *ds;
  48     QEMUConsole *console;
  49     int row;
  50     int col;
  51     int start_line;
  52     int mirror;
  53     int flash;
  54     int enabled;
  55     int inverse;
  56     int redraw;
  57     enum ssd0303_mode mode;
  58     enum ssd0303_cmd cmd_state;
  59     uint8_t framebuffer[132*8];
  60 } ssd0303_state;
  61
  62 static int ssd0303_recv(i2c_slave *i2c)
  63 {
  64     BADF("Reads not implemented\n");
  65     return -1;
  66 }
  67
  68 static int ssd0303_send(i2c_slave *i2c, uint8_t data)
  69 {
  70     ssd0303_state *s = (ssd0303_state *)i2c;
  71     enum ssd0303_cmd old_cmd_state;
  72     switch (s->mode) {
  73     case SSD0303_IDLE:
  74         DPRINTF("byte 0x%02x\n", data);
  75         if (data == 0x80)
  76             s->mode = SSD0303_CMD;
  77         else if (data == 0x40)
  78             s->mode = SSD0303_DATA;
  79         else
  80             BADF("Unexpected byte 0x%x\n", data);
  81         break;
  82     case SSD0303_DATA:
  83         DPRINTF("data 0x%02x\n", data);
  84         if (s->col < 132) {
  85             s->framebuffer[s->col + s->row * 132] = data;
  86             s->col++;
  87             s->redraw = 1;
  88         }
  89         break;
  90     case SSD0303_CMD:
  91         old_cmd_state = s->cmd_state;
  92         s->cmd_state = SSD0303_CMD_NONE;
  93         switch (old_cmd_state) {
  94         case SSD0303_CMD_NONE:
  95             DPRINTF("cmd 0x%02x\n", data);
  96             s->mode = SSD0303_IDLE;
  97             switch (data) {
  98             case 0x00 ... 0x0f: /* Set lower colum address.  */
  99                 s->col = (s->col & 0xf0) | (data & 0xf);
 100                 break;
 101             case 0x10 ... 0x20: /* Set higher column address.  */
 102                 s->col = (s->col & 0x0f) | ((data & 0xf) << 4);
 103                 break;
 104             case 0x40 ... 0x7f: /* Set start line.  */
 105                 s->start_line = 0;
 106                 break;
 107             case 0x81: /* Set contrast (Ignored).  */
 108                 s->cmd_state = SSD0303_CMD_SKIP1;
 109                 break;
 110             case 0xa0: /* Mirror off.  */
 111                 s->mirror = 0;
 112                 break;
 113             case 0xa1: /* Mirror off.  */
 114                 s->mirror = 1;
 115                 break;
 116             case 0xa4: /* Entire display off.  */
 117                 s->flash = 0;
 118                 break;
 119             case 0xa5: /* Entire display on.  */
 120                 s->flash = 1;
 121                 break;
 122             case 0xa6: /* Inverse off.  */
 123                 s->inverse = 0;
 124                 break;
 125             case 0xa7: /* Inverse on.  */
 126                 s->inverse = 1;
 127                 break;
 128             case 0xa8: /* Set multipled ratio (Ignored).  */
 129                 s->cmd_state = SSD0303_CMD_SKIP1;
 130                 break;
 131             case 0xad: /* DC-DC power control.  */
 132                 s->cmd_state = SSD0303_CMD_SKIP1;
 133                 break;
 134             case 0xae: /* Display off.  */
 135                 s->enabled = 0;
 136                 break;
 137             case 0xaf: /* Display on.  */
 138                 s->enabled = 1;
 139                 break;
 140             case 0xb0 ... 0xbf: /* Set Page address.  */
 141                 s->row = data & 7;
 142                 break;
 143             case 0xc0 ... 0xc8: /* Set COM output direction (Ignored).  */
 144                 break;
 145             case 0xd3: /* Set display offset (Ignored).  */
 146                 s->cmd_state = SSD0303_CMD_SKIP1;
 147                 break;
 148             case 0xd5: /* Set display clock (Ignored).  */
 149                 s->cmd_state = SSD0303_CMD_SKIP1;
 150                 break;
 151             case 0xd8: /* Set color and power mode (Ignored).  */
 152                 s->cmd_state = SSD0303_CMD_SKIP1;
 153                 break;
 154             case 0xd9: /* Set pre-charge period (Ignored).  */
 155                 s->cmd_state = SSD0303_CMD_SKIP1;
 156                 break;
 157             case 0xda: /* Set COM pin configuration (Ignored).  */
 158                 s->cmd_state = SSD0303_CMD_SKIP1;
 159                 break;
 160             case 0xdb: /* Set VCOM dselect level (Ignored).  */
 161                 s->cmd_state = SSD0303_CMD_SKIP1;
 162                 break;
 163             case 0xe3: /* no-op.  */
 164                 break;
 165             default:
 166                 BADF("Unknown command: 0x%x\n", data);
 167             }
 168             break;
 169         case SSD0303_CMD_SKIP1:
 170             DPRINTF("skip 0x%02x\n", data);
 171             break;
 172         }
 173         break;
 174     }
 175     return 0;
 176 }
 177
 178 static void ssd0303_event(i2c_slave *i2c, enum i2c_event event)
 179 {
 180     ssd0303_state *s = (ssd0303_state *)i2c;
 181     switch (event) {
 182     case I2C_FINISH:
 183         s->mode = SSD0303_IDLE;
 184         break;
 185     case I2C_START_RECV:
 186     case I2C_START_SEND:
 187     case I2C_NACK:
 188         /* Nothing to do.  */
 189         break;
 190     }
 191 }
 192
 193 static void ssd0303_update_display(void *opaque)
 194 {
 195     ssd0303_state *s = (ssd0303_state *)opaque;
 196     uint8_t *dest;
 197     uint8_t *src;
 198     int x;
 199     int y;
 200     int line;
 201     char *colors[2];
 202     char colortab[MAGNIFY * 8];
 203     int dest_width;
 204     uint8_t mask;
 205
 206     if (!s->redraw)
 207         return;
 208
 209     switch (ds_get_bits_per_pixel(s->ds)) {
 210     case 0:
 211         return;
 212     case 15:
 213         dest_width = 2;
 214         break;
 215     case 16:
 216         dest_width = 2;
 217         break;
 218     case 24:
 219         dest_width = 3;
 220         break;
 221     case 32:
 222         dest_width = 4;
 223         break;
 224     default:
 225         BADF("Bad color depth\n");
 226         return;
 227     }
 228     dest_width *= MAGNIFY;
 229     memset(colortab, 0xff, dest_width);
 230     memset(colortab + dest_width, 0, dest_width);
 231     if (s->flash) {
 232         colors[0] = colortab;
 233         colors[1] = colortab;
 234     } else if (s->inverse) {
 235         colors[0] = colortab;
 236         colors[1] = colortab + dest_width;
 237     } else {
 238         colors[0] = colortab + dest_width;
 239         colors[1] = colortab;
 240     }
 241     dest = ds_get_data(s->ds);
 242     for (y = 0; y < 16; y++) {
 243         line = (y + s->start_line) & 63;
 244         src = s->framebuffer + 132 * (line >> 3) + 36;
 245         mask = 1 << (line & 7);
 246         for (x = 0; x < 96; x++) {
 247             memcpy(dest, colors[(*src & mask) != 0], dest_width);
 248             dest += dest_width;
 249             src++;
 250         }
 251         for (x = 1; x < MAGNIFY; x++) {
 252             memcpy(dest, dest - dest_width * 96, dest_width * 96);
 253             dest += dest_width * 96;
 254         }
 255     }
 256     s->redraw = 0;
 257     dpy_update(s->ds, 0, 0, 96 * MAGNIFY, 16 * MAGNIFY);
 258 }
 259
 260 static void ssd0303_invalidate_display(void * opaque)
 261 {
 262     ssd0303_state *s = (ssd0303_state *)opaque;
 263     s->redraw = 1;
 264 }
 265
 266 static void ssd0303_save(QEMUFile *f, void *opaque)
 267 {
 268     ssd0303_state *s = (ssd0303_state *)opaque;
 269
 270     qemu_put_be32(f, s->row);
 271     qemu_put_be32(f, s->col);
 272     qemu_put_be32(f, s->start_line);
 273     qemu_put_be32(f, s->mirror);
 274     qemu_put_be32(f, s->flash);
 275     qemu_put_be32(f, s->enabled);
 276     qemu_put_be32(f, s->inverse);
 277     qemu_put_be32(f, s->redraw);
 278     qemu_put_be32(f, s->mode);
 279     qemu_put_be32(f, s->cmd_state);
 280     qemu_put_buffer(f, s->framebuffer, sizeof(s->framebuffer));
 281
 282     i2c_slave_save(f, &s->i2c);
 283 }
 284
 285 static int ssd0303_load(QEMUFile *f, void *opaque, int version_id)
 286 {
 287     ssd0303_state *s = (ssd0303_state *)opaque;
 288
 289     if (version_id != 1)
 290         return -EINVAL;
 291
 292     s->row = qemu_get_be32(f);
 293     s->col = qemu_get_be32(f);
 294     s->start_line = qemu_get_be32(f);
 295     s->mirror = qemu_get_be32(f);
 296     s->flash = qemu_get_be32(f);
 297     s->enabled = qemu_get_be32(f);
 298     s->inverse = qemu_get_be32(f);
 299     s->redraw = qemu_get_be32(f);
 300     s->mode = qemu_get_be32(f);
 301     s->cmd_state = qemu_get_be32(f);
 302     qemu_get_buffer(f, s->framebuffer, sizeof(s->framebuffer));
 303
 304     i2c_slave_load(f, &s->i2c);
 305
 306     return 0;
 307 }
 308
 309 void ssd0303_init(DisplayState *ds, i2c_bus *bus, int address)
 310 {
 311     ssd0303_state *s;
 312
 313     s = (ssd0303_state *)i2c_slave_init(bus, address, sizeof(ssd0303_state));
 314     s->ds = ds;
 315     s->i2c.event = ssd0303_event;
 316     s->i2c.recv = ssd0303_recv;
 317     s->i2c.send = ssd0303_send;
 318     s->console = graphic_console_init(ds, ssd0303_update_display,
 319                                       ssd0303_invalidate_display,
 320                                       NULL, NULL, s);
 321     qemu_console_resize(s->console, 96 * MAGNIFY, 16 * MAGNIFY);
 322     register_savevm("ssd0303_oled", -1, 1, ssd0303_save, ssd0303_load, s);
 323 }