/* * SSD0303 OLED controller with OSRAM Pictiva 96x16 display. * * Copyright (c) 2006-2007 CodeSourcery. * Written by Paul Brook * * This code is licenced under the GPL. */ /* The controller can support a variety of different displays, but we only implement one. Most of the commends relating to brightness and geometry setup are ignored. */ #include "hw.h" #include "i2c.h" #include "console.h" //#define DEBUG_SSD0303 1 #ifdef DEBUG_SSD0303 #define DPRINTF(fmt, args...) \ do { printf("ssd0303: " fmt , ##args); } while (0) #define BADF(fmt, args...) \ do { fprintf(stderr, "ssd0303: error: " fmt , ##args); exit(1);} while (0) #else #define DPRINTF(fmt, args...) do {} while(0) #define BADF(fmt, args...) \ do { fprintf(stderr, "ssd0303: error: " fmt , ##args);} while (0) #endif /* Scaling factor for pixels. */ #define MAGNIFY 4 enum ssd0303_mode { SSD0303_IDLE, SSD0303_DATA, SSD0303_CMD }; enum ssd0303_cmd { SSD0303_CMD_NONE, SSD0303_CMD_SKIP1 }; typedef struct { i2c_slave i2c; DisplayState *ds; int row; int col; int start_line; int mirror; int flash; int enabled; int inverse; int redraw; enum ssd0303_mode mode; enum ssd0303_cmd cmd_state; uint8_t framebuffer[132*8]; } ssd0303_state; static int ssd0303_recv(i2c_slave *i2c) { BADF("Reads not implemented\n"); return -1; } static int ssd0303_send(i2c_slave *i2c, uint8_t data) { ssd0303_state *s = (ssd0303_state *)i2c; enum ssd0303_cmd old_cmd_state; switch (s->mode) { case SSD0303_IDLE: DPRINTF("byte 0x%02x\n", data); if (data == 0x80) s->mode = SSD0303_CMD; else if (data == 0x40) s->mode = SSD0303_DATA; else BADF("Unexpected byte 0x%x\n", data); break; case SSD0303_DATA: DPRINTF("data 0x%02x\n", data); if (s->col < 132) { s->framebuffer[s->col + s->row * 132] = data; s->col++; s->redraw = 1; } break; case SSD0303_CMD: old_cmd_state = s->cmd_state; s->cmd_state = SSD0303_CMD_NONE; switch (old_cmd_state) { case SSD0303_CMD_NONE: DPRINTF("cmd 0x%02x\n", data); s->mode = SSD0303_IDLE; switch (data) { case 0x00 ... 0x0f: /* Set lower colum address. */ s->col = (s->col & 0xf0) | (data & 0xf); break; case 0x10 ... 0x20: /* Set higher column address. */ s->col = (s->col & 0x0f) | ((data & 0xf) << 4); break; case 0x40 ... 0x7f: /* Set start line. */ s->start_line = 0; break; case 0x81: /* Set contrast (Ignored). */ s->cmd_state = SSD0303_CMD_SKIP1; break; case 0xa0: /* Mirror off. */ s->mirror = 0; break; case 0xa1: /* Mirror off. */ s->mirror = 1; break; case 0xa4: /* Entire display off. */ s->flash = 0; break; case 0xa5: /* Entire display on. */ s->flash = 1; break; case 0xa6: /* Inverse off. */ s->inverse = 0; break; case 0xa7: /* Inverse on. */ s->inverse = 1; break; case 0xa8: /* Set multipled ratio (Ignored). */ s->cmd_state = SSD0303_CMD_SKIP1; break; case 0xad: /* DC-DC power control. */ s->cmd_state = SSD0303_CMD_SKIP1; break; case 0xae: /* Display off. */ s->enabled = 0; break; case 0xaf: /* Display on. */ s->enabled = 1; break; case 0xb0 ... 0xbf: /* Set Page address. */ s->row = data & 7; break; case 0xc0 ... 0xc8: /* Set COM output direction (Ignored). */ break; case 0xd3: /* Set display offset (Ignored). */ s->cmd_state = SSD0303_CMD_SKIP1; break; case 0xd5: /* Set display clock (Ignored). */ s->cmd_state = SSD0303_CMD_SKIP1; break; case 0xd8: /* Set color and power mode (Ignored). */ s->cmd_state = SSD0303_CMD_SKIP1; break; case 0xd9: /* Set pre-charge period (Ignored). */ s->cmd_state = SSD0303_CMD_SKIP1; break; case 0xda: /* Set COM pin configuration (Ignored). */ s->cmd_state = SSD0303_CMD_SKIP1; break; case 0xdb: /* Set VCOM dselect level (Ignored). */ s->cmd_state = SSD0303_CMD_SKIP1; break; case 0xe3: /* no-op. */ break; default: BADF("Unknown command: 0x%x\n", data); } break; case SSD0303_CMD_SKIP1: DPRINTF("skip 0x%02x\n", data); break; } break; } return 0; } static void ssd0303_event(i2c_slave *i2c, enum i2c_event event) { ssd0303_state *s = (ssd0303_state *)i2c; switch (event) { case I2C_FINISH: s->mode = SSD0303_IDLE; break; case I2C_START_RECV: case I2C_START_SEND: case I2C_NACK: /* Nothing to do. */ break; } } static void ssd0303_update_display(void *opaque) { ssd0303_state *s = (ssd0303_state *)opaque; uint8_t *dest; uint8_t *src; int x; int y; int line; char *colors[2]; char colortab[MAGNIFY * 8]; int dest_width; uint8_t mask; if (s->redraw) { switch (s->ds->depth) { case 0: return; case 15: dest_width = 2; break; case 16: dest_width = 2; break; case 24: dest_width = 3; break; case 32: dest_width = 4; break; default: BADF("Bad color depth\n"); return; } dest_width *= MAGNIFY; memset(colortab, 0xff, dest_width); memset(colortab + dest_width, 0, dest_width); if (s->flash) { colors[0] = colortab; colors[1] = colortab; } else if (s->inverse) { colors[0] = colortab; colors[1] = colortab + dest_width; } else { colors[0] = colortab + dest_width; colors[1] = colortab; } dest = s->ds->data; for (y = 0; y < 16; y++) { line = (y + s->start_line) & 63; src = s->framebuffer + 132 * (line >> 3) + 36; mask = 1 << (line & 7); for (x = 0; x < 96; x++) { memcpy(dest, colors[(*src & mask) != 0], dest_width); dest += dest_width; src++; } for (x = 1; x < MAGNIFY; x++) { memcpy(dest, dest - dest_width * 96, dest_width * 96); dest += dest_width * 96; } } } dpy_update(s->ds, 0, 0, 96 * MAGNIFY, 16 * MAGNIFY); } static void ssd0303_invalidate_display(void * opaque) { ssd0303_state *s = (ssd0303_state *)opaque; s->redraw = 1; } void ssd0303_init(DisplayState *ds, i2c_bus *bus, int address) { ssd0303_state *s; s = (ssd0303_state *)i2c_slave_init(bus, address, sizeof(ssd0303_state)); s->ds = ds; s->i2c.event = ssd0303_event; s->i2c.recv = ssd0303_recv; s->i2c.send = ssd0303_send; graphic_console_init(ds, ssd0303_update_display, ssd0303_invalidate_display, NULL, s); dpy_resize(s->ds, 96 * MAGNIFY, 16 * MAGNIFY); }