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 "i2c.h"
  14 #include "console.h"
  15
  16 //#define DEBUG_SSD0303 1
  17
  18 #ifdef DEBUG_SSD0303
  19 #define DPRINTF(fmt, ...) \
  20 do { printf("ssd0303: " fmt , ## __VA_ARGS__); } while (0)
  21 #define BADF(fmt, ...) \
  22 do { fprintf(stderr, "ssd0303: error: " fmt , ## __VA_ARGS__); exit(1);} while (0)
  23 #else
  24 #define DPRINTF(fmt, ...) do {} while(0)
  25 #define BADF(fmt, ...) \
  26 do { fprintf(stderr, "ssd0303: error: " fmt , ## __VA_ARGS__);} while (0)
  27 #endif
  28
  29 /* Scaling factor for pixels.  */
  30 #define MAGNIFY 4
  31
  32 enum ssd0303_mode
  33 {
  34     SSD0303_IDLE,
  35     SSD0303_DATA,
  36     SSD0303_CMD
  37 };
  38
  39 enum ssd0303_cmd {
  40     SSD0303_CMD_NONE,
  41     SSD0303_CMD_SKIP1
  42 };
  43
  44 typedef struct {
  45     i2c_slave i2c;
  46     DisplayState *ds;
  47     int row;
  48     int col;
  49     int start_line;
  50     int mirror;
  51     int flash;
  52     int enabled;
  53     int inverse;
  54     int redraw;
  55     enum ssd0303_mode mode;
  56     enum ssd0303_cmd cmd_state;
  57     uint8_t framebuffer[132*8];
  58 } ssd0303_state;
  59
  60 static int ssd0303_recv(i2c_slave *i2c)
  61 {
  62     BADF("Reads not implemented\n");
  63     return -1;
  64 }
  65
  66 static int ssd0303_send(i2c_slave *i2c, uint8_t data)
  67 {
  68     ssd0303_state *s = (ssd0303_state *)i2c;
  69     enum ssd0303_cmd old_cmd_state;
  70     switch (s->mode) {
  71     case SSD0303_IDLE:
  72         DPRINTF("byte 0x%02x\n", data);
  73         if (data == 0x80)
  74             s->mode = SSD0303_CMD;
  75         else if (data == 0x40)
  76             s->mode = SSD0303_DATA;
  77         else
  78             BADF("Unexpected byte 0x%x\n", data);
  79         break;
  80     case SSD0303_DATA:
  81         DPRINTF("data 0x%02x\n", data);
  82         if (s->col < 132) {
  83             s->framebuffer[s->col + s->row * 132] = data;
  84             s->col++;
  85             s->redraw = 1;
  86         }
  87         break;
  88     case SSD0303_CMD:
  89         old_cmd_state = s->cmd_state;
  90         s->cmd_state = SSD0303_CMD_NONE;
  91         switch (old_cmd_state) {
  92         case SSD0303_CMD_NONE:
  93             DPRINTF("cmd 0x%02x\n", data);
  94             s->mode = SSD0303_IDLE;
  95             switch (data) {
  96             case 0x00 ... 0x0f: /* Set lower colum address.  */
  97                 s->col = (s->col & 0xf0) | (data & 0xf);
  98                 break;
  99             case 0x10 ... 0x20: /* Set higher column address.  */
 100                 s->col = (s->col & 0x0f) | ((data & 0xf) << 4);
 101                 break;
 102             case 0x40 ... 0x7f: /* Set start line.  */
 103                 s->start_line = 0;
 104                 break;
 105             case 0x81: /* Set contrast (Ignored).  */
 106                 s->cmd_state = SSD0303_CMD_SKIP1;
 107                 break;
 108             case 0xa0: /* Mirror off.  */
 109                 s->mirror = 0;
 110                 break;
 111             case 0xa1: /* Mirror off.  */
 112                 s->mirror = 1;
 113                 break;
 114             case 0xa4: /* Entire display off.  */
 115                 s->flash = 0;
 116                 break;
 117             case 0xa5: /* Entire display on.  */
 118                 s->flash = 1;
 119                 break;
 120             case 0xa6: /* Inverse off.  */
 121                 s->inverse = 0;
 122                 break;
 123             case 0xa7: /* Inverse on.  */
 124                 s->inverse = 1;
 125                 break;
 126             case 0xa8: /* Set multipled ratio (Ignored).  */
 127                 s->cmd_state = SSD0303_CMD_SKIP1;
 128                 break;
 129             case 0xad: /* DC-DC power control.  */
 130                 s->cmd_state = SSD0303_CMD_SKIP1;
 131                 break;
 132             case 0xae: /* Display off.  */
 133                 s->enabled = 0;
 134                 break;
 135             case 0xaf: /* Display on.  */
 136                 s->enabled = 1;
 137                 break;
 138             case 0xb0 ... 0xbf: /* Set Page address.  */
 139                 s->row = data & 7;
 140                 break;
 141             case 0xc0 ... 0xc8: /* Set COM output direction (Ignored).  */
 142                 break;
 143             case 0xd3: /* Set display offset (Ignored).  */
 144                 s->cmd_state = SSD0303_CMD_SKIP1;
 145                 break;
 146             case 0xd5: /* Set display clock (Ignored).  */
 147                 s->cmd_state = SSD0303_CMD_SKIP1;
 148                 break;
 149             case 0xd8: /* Set color and power mode (Ignored).  */
 150                 s->cmd_state = SSD0303_CMD_SKIP1;
 151                 break;
 152             case 0xd9: /* Set pre-charge period (Ignored).  */
 153                 s->cmd_state = SSD0303_CMD_SKIP1;
 154                 break;
 155             case 0xda: /* Set COM pin configuration (Ignored).  */
 156                 s->cmd_state = SSD0303_CMD_SKIP1;
 157                 break;
 158             case 0xdb: /* Set VCOM dselect level (Ignored).  */
 159                 s->cmd_state = SSD0303_CMD_SKIP1;
 160                 break;
 161             case 0xe3: /* no-op.  */
 162                 break;
 163             default:
 164                 BADF("Unknown command: 0x%x\n", data);
 165             }
 166             break;
 167         case SSD0303_CMD_SKIP1:
 168             DPRINTF("skip 0x%02x\n", data);
 169             break;
 170         }
 171         break;
 172     }
 173     return 0;
 174 }
 175
 176 static void ssd0303_event(i2c_slave *i2c, enum i2c_event event)
 177 {
 178     ssd0303_state *s = (ssd0303_state *)i2c;
 179     switch (event) {
 180     case I2C_FINISH:
 181         s->mode = SSD0303_IDLE;
 182         break;
 183     case I2C_START_RECV:
 184     case I2C_START_SEND:
 185     case I2C_NACK:
 186         /* Nothing to do.  */
 187         break;
 188     }
 189 }
 190
 191 static void ssd0303_update_display(void *opaque)
 192 {
 193     ssd0303_state *s = (ssd0303_state *)opaque;
 194     uint8_t *dest;
 195     uint8_t *src;
 196     int x;
 197     int y;
 198     int line;
 199     char *colors[2];
 200     char colortab[MAGNIFY * 8];
 201     int dest_width;
 202     uint8_t mask;
 203
 204     if (!s->redraw)
 205         return;
 206
 207     switch (ds_get_bits_per_pixel(s->ds)) {
 208     case 0:
 209         return;
 210     case 15:
 211         dest_width = 2;
 212         break;
 213     case 16:
 214         dest_width = 2;
 215         break;
 216     case 24:
 217         dest_width = 3;
 218         break;
 219     case 32:
 220         dest_width = 4;
 221         break;
 222     default:
 223         BADF("Bad color depth\n");
 224         return;
 225     }
 226     dest_width *= MAGNIFY;
 227     memset(colortab, 0xff, dest_width);
 228     memset(colortab + dest_width, 0, dest_width);
 229     if (s->flash) {
 230         colors[0] = colortab;
 231         colors[1] = colortab;
 232     } else if (s->inverse) {
 233         colors[0] = colortab;
 234         colors[1] = colortab + dest_width;
 235     } else {
 236         colors[0] = colortab + dest_width;
 237         colors[1] = colortab;
 238     }
 239     dest = ds_get_data(s->ds);
 240     for (y = 0; y < 16; y++) {
 241         line = (y + s->start_line) & 63;
 242         src = s->framebuffer + 132 * (line >> 3) + 36;
 243         mask = 1 << (line & 7);
 244         for (x = 0; x < 96; x++) {
 245             memcpy(dest, colors[(*src & mask) != 0], dest_width);
 246             dest += dest_width;
 247             src++;
 248         }
 249         for (x = 1; x < MAGNIFY; x++) {
 250             memcpy(dest, dest - dest_width * 96, dest_width * 96);
 251             dest += dest_width * 96;
 252         }
 253     }
 254     s->redraw = 0;
 255     dpy_update(s->ds, 0, 0, 96 * MAGNIFY, 16 * MAGNIFY);
 256 }
 257
 258 static void ssd0303_invalidate_display(void * opaque)
 259 {
 260     ssd0303_state *s = (ssd0303_state *)opaque;
 261     s->redraw = 1;
 262 }
 263
 264 static void ssd0303_save(QEMUFile *f, void *opaque)
 265 {
 266     ssd0303_state *s = (ssd0303_state *)opaque;
 267
 268     qemu_put_be32(f, s->row);
 269     qemu_put_be32(f, s->col);
 270     qemu_put_be32(f, s->start_line);
 271     qemu_put_be32(f, s->mirror);
 272     qemu_put_be32(f, s->flash);
 273     qemu_put_be32(f, s->enabled);
 274     qemu_put_be32(f, s->inverse);
 275     qemu_put_be32(f, s->redraw);
 276     qemu_put_be32(f, s->mode);
 277     qemu_put_be32(f, s->cmd_state);
 278     qemu_put_buffer(f, s->framebuffer, sizeof(s->framebuffer));
 279
 280     i2c_slave_save(f, &s->i2c);
 281 }
 282
 283 static int ssd0303_load(QEMUFile *f, void *opaque, int version_id)
 284 {
 285     ssd0303_state *s = (ssd0303_state *)opaque;
 286
 287     if (version_id != 1)
 288         return -EINVAL;
 289
 290     s->row = qemu_get_be32(f);
 291     s->col = qemu_get_be32(f);
 292     s->start_line = qemu_get_be32(f);
 293     s->mirror = qemu_get_be32(f);
 294     s->flash = qemu_get_be32(f);
 295     s->enabled = qemu_get_be32(f);
 296     s->inverse = qemu_get_be32(f);
 297     s->redraw = qemu_get_be32(f);
 298     s->mode = qemu_get_be32(f);
 299     s->cmd_state = qemu_get_be32(f);
 300     qemu_get_buffer(f, s->framebuffer, sizeof(s->framebuffer));
 301
 302     i2c_slave_load(f, &s->i2c);
 303
 304     return 0;
 305 }
 306
 307 static void ssd0303_init(i2c_slave *i2c)
 308 {
 309     ssd0303_state *s = FROM_I2C_SLAVE(ssd0303_state, i2c);
 310
 311     s->ds = graphic_console_init(ssd0303_update_display,
 312                                  ssd0303_invalidate_display,
 313                                  NULL, NULL, s);
 314     qemu_console_resize(s->ds, 96 * MAGNIFY, 16 * MAGNIFY);
 315     register_savevm("ssd0303_oled", -1, 1, ssd0303_save, ssd0303_load, s);
 316 }
 317
 318 static I2CSlaveInfo ssd0303_info = {
 319     .init = ssd0303_init,
 320     .event = ssd0303_event,
 321     .recv = ssd0303_recv,
 322     .send = ssd0303_send
 323 };
 324
 325 static void ssd0303_register_devices(void)
 326 {
 327     i2c_register_slave("ssd0303", sizeof(ssd0303_state), &ssd0303_info);
 328 }
 329
 330 device_init(ssd0303_register_devices)