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 licensed 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/i2c.h"
  14 #include "ui/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     I2CSlave i2c;
  46     QemuConsole *con;
  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(I2CSlave *i2c)
  61 {
  62     BADF("Reads not implemented\n");
  63     return -1;
  64 }
  65
  66 static int ssd0303_send(I2CSlave *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 column 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 multiplied 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(I2CSlave *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     DisplaySurface *surface = qemu_console_surface(s->con);
 195     uint8_t *dest;
 196     uint8_t *src;
 197     int x;
 198     int y;
 199     int line;
 200     char *colors[2];
 201     char colortab[MAGNIFY * 8];
 202     int dest_width;
 203     uint8_t mask;
 204
 205     if (!s->redraw)
 206         return;
 207
 208     switch (surface_bits_per_pixel(surface)) {
 209     case 0:
 210         return;
 211     case 15:
 212         dest_width = 2;
 213         break;
 214     case 16:
 215         dest_width = 2;
 216         break;
 217     case 24:
 218         dest_width = 3;
 219         break;
 220     case 32:
 221         dest_width = 4;
 222         break;
 223     default:
 224         BADF("Bad color depth\n");
 225         return;
 226     }
 227     dest_width *= MAGNIFY;
 228     memset(colortab, 0xff, dest_width);
 229     memset(colortab + dest_width, 0, dest_width);
 230     if (s->flash) {
 231         colors[0] = colortab;
 232         colors[1] = colortab;
 233     } else if (s->inverse) {
 234         colors[0] = colortab;
 235         colors[1] = colortab + dest_width;
 236     } else {
 237         colors[0] = colortab + dest_width;
 238         colors[1] = colortab;
 239     }
 240     dest = surface_data(surface);
 241     for (y = 0; y < 16; y++) {
 242         line = (y + s->start_line) & 63;
 243         src = s->framebuffer + 132 * (line >> 3) + 36;
 244         mask = 1 << (line & 7);
 245         for (x = 0; x < 96; x++) {
 246             memcpy(dest, colors[(*src & mask) != 0], dest_width);
 247             dest += dest_width;
 248             src++;
 249         }
 250         for (x = 1; x < MAGNIFY; x++) {
 251             memcpy(dest, dest - dest_width * 96, dest_width * 96);
 252             dest += dest_width * 96;
 253         }
 254     }
 255     s->redraw = 0;
 256     dpy_gfx_update(s->con, 0, 0, 96 * MAGNIFY, 16 * MAGNIFY);
 257 }
 258
 259 static void ssd0303_invalidate_display(void * opaque)
 260 {
 261     ssd0303_state *s = (ssd0303_state *)opaque;
 262     s->redraw = 1;
 263 }
 264
 265 static const VMStateDescription vmstate_ssd0303 = {
 266     .name = "ssd0303_oled",
 267     .version_id = 1,
 268     .minimum_version_id = 1,
 269     .minimum_version_id_old = 1,
 270     .fields      = (VMStateField []) {
 271         VMSTATE_INT32(row, ssd0303_state),
 272         VMSTATE_INT32(col, ssd0303_state),
 273         VMSTATE_INT32(start_line, ssd0303_state),
 274         VMSTATE_INT32(mirror, ssd0303_state),
 275         VMSTATE_INT32(flash, ssd0303_state),
 276         VMSTATE_INT32(enabled, ssd0303_state),
 277         VMSTATE_INT32(inverse, ssd0303_state),
 278         VMSTATE_INT32(redraw, ssd0303_state),
 279         VMSTATE_UINT32(mode, ssd0303_state),
 280         VMSTATE_UINT32(cmd_state, ssd0303_state),
 281         VMSTATE_BUFFER(framebuffer, ssd0303_state),
 282         VMSTATE_I2C_SLAVE(i2c, ssd0303_state),
 283         VMSTATE_END_OF_LIST()
 284     }
 285 };
 286
 287 static int ssd0303_init(I2CSlave *i2c)
 288 {
 289     ssd0303_state *s = FROM_I2C_SLAVE(ssd0303_state, i2c);
 290
 291     s->con = graphic_console_init(ssd0303_update_display,
 292                                   ssd0303_invalidate_display,
 293                                   NULL, NULL, s);
 294     qemu_console_resize(s->con, 96 * MAGNIFY, 16 * MAGNIFY);
 295     return 0;
 296 }
 297
 298 static void ssd0303_class_init(ObjectClass *klass, void *data)
 299 {
 300     DeviceClass *dc = DEVICE_CLASS(klass);
 301     I2CSlaveClass *k = I2C_SLAVE_CLASS(klass);
 302
 303     k->init = ssd0303_init;
 304     k->event = ssd0303_event;
 305     k->recv = ssd0303_recv;
 306     k->send = ssd0303_send;
 307     dc->vmsd = &vmstate_ssd0303;
 308 }
 309
 310 static const TypeInfo ssd0303_info = {
 311     .name          = "ssd0303",
 312     .parent        = TYPE_I2C_SLAVE,
 313     .instance_size = sizeof(ssd0303_state),
 314     .class_init    = ssd0303_class_init,
 315 };
 316
 317 static void ssd0303_register_types(void)
 318 {
 319     type_register_static(&ssd0303_info);
 320 }
 321
 322 type_init(ssd0303_register_types)