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1.1 root 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: int row;
49: int col;
50: int start_line;
51: int mirror;
52: int flash;
53: int enabled;
54: int inverse;
55: int redraw;
56: enum ssd0303_mode mode;
57: enum ssd0303_cmd cmd_state;
58: uint8_t framebuffer[132*8];
59: } ssd0303_state;
60:
61: static int ssd0303_recv(i2c_slave *i2c)
62: {
63: BADF("Reads not implemented\n");
64: return -1;
65: }
66:
67: static int ssd0303_send(i2c_slave *i2c, uint8_t data)
68: {
69: ssd0303_state *s = (ssd0303_state *)i2c;
70: enum ssd0303_cmd old_cmd_state;
71: switch (s->mode) {
72: case SSD0303_IDLE:
73: DPRINTF("byte 0x%02x\n", data);
74: if (data == 0x80)
75: s->mode = SSD0303_CMD;
76: else if (data == 0x40)
77: s->mode = SSD0303_DATA;
78: else
79: BADF("Unexpected byte 0x%x\n", data);
80: break;
81: case SSD0303_DATA:
82: DPRINTF("data 0x%02x\n", data);
83: if (s->col < 132) {
84: s->framebuffer[s->col + s->row * 132] = data;
85: s->col++;
86: s->redraw = 1;
87: }
88: break;
89: case SSD0303_CMD:
90: old_cmd_state = s->cmd_state;
91: s->cmd_state = SSD0303_CMD_NONE;
92: switch (old_cmd_state) {
93: case SSD0303_CMD_NONE:
94: DPRINTF("cmd 0x%02x\n", data);
95: s->mode = SSD0303_IDLE;
96: switch (data) {
97: case 0x00 ... 0x0f: /* Set lower colum address. */
98: s->col = (s->col & 0xf0) | (data & 0xf);
99: break;
100: case 0x10 ... 0x20: /* Set higher column address. */
101: s->col = (s->col & 0x0f) | ((data & 0xf) << 4);
102: break;
103: case 0x40 ... 0x7f: /* Set start line. */
104: s->start_line = 0;
105: break;
106: case 0x81: /* Set contrast (Ignored). */
107: s->cmd_state = SSD0303_CMD_SKIP1;
108: break;
109: case 0xa0: /* Mirror off. */
110: s->mirror = 0;
111: break;
112: case 0xa1: /* Mirror off. */
113: s->mirror = 1;
114: break;
115: case 0xa4: /* Entire display off. */
116: s->flash = 0;
117: break;
118: case 0xa5: /* Entire display on. */
119: s->flash = 1;
120: break;
121: case 0xa6: /* Inverse off. */
122: s->inverse = 0;
123: break;
124: case 0xa7: /* Inverse on. */
125: s->inverse = 1;
126: break;
127: case 0xa8: /* Set multipled ratio (Ignored). */
128: s->cmd_state = SSD0303_CMD_SKIP1;
129: break;
130: case 0xad: /* DC-DC power control. */
131: s->cmd_state = SSD0303_CMD_SKIP1;
132: break;
133: case 0xae: /* Display off. */
134: s->enabled = 0;
135: break;
136: case 0xaf: /* Display on. */
137: s->enabled = 1;
138: break;
139: case 0xb0 ... 0xbf: /* Set Page address. */
140: s->row = data & 7;
141: break;
142: case 0xc0 ... 0xc8: /* Set COM output direction (Ignored). */
143: break;
144: case 0xd3: /* Set display offset (Ignored). */
145: s->cmd_state = SSD0303_CMD_SKIP1;
146: break;
147: case 0xd5: /* Set display clock (Ignored). */
148: s->cmd_state = SSD0303_CMD_SKIP1;
149: break;
150: case 0xd8: /* Set color and power mode (Ignored). */
151: s->cmd_state = SSD0303_CMD_SKIP1;
152: break;
153: case 0xd9: /* Set pre-charge period (Ignored). */
154: s->cmd_state = SSD0303_CMD_SKIP1;
155: break;
156: case 0xda: /* Set COM pin configuration (Ignored). */
157: s->cmd_state = SSD0303_CMD_SKIP1;
158: break;
159: case 0xdb: /* Set VCOM dselect level (Ignored). */
160: s->cmd_state = SSD0303_CMD_SKIP1;
161: break;
162: case 0xe3: /* no-op. */
163: break;
164: default:
165: BADF("Unknown command: 0x%x\n", data);
166: }
167: break;
168: case SSD0303_CMD_SKIP1:
169: DPRINTF("skip 0x%02x\n", data);
170: break;
171: }
172: break;
173: }
174: return 0;
175: }
176:
177: static void ssd0303_event(i2c_slave *i2c, enum i2c_event event)
178: {
179: ssd0303_state *s = (ssd0303_state *)i2c;
180: switch (event) {
181: case I2C_FINISH:
182: s->mode = SSD0303_IDLE;
183: break;
184: case I2C_START_RECV:
185: case I2C_START_SEND:
186: case I2C_NACK:
187: /* Nothing to do. */
188: break;
189: }
190: }
191:
192: static void ssd0303_update_display(void *opaque)
193: {
194: ssd0303_state *s = (ssd0303_state *)opaque;
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: switch (s->ds->depth) {
207: case 0:
208: return;
209: case 15:
210: dest_width = 2;
211: break;
212: case 16:
213: dest_width = 2;
214: break;
215: case 24:
216: dest_width = 3;
217: break;
218: case 32:
219: dest_width = 4;
220: break;
221: default:
222: BADF("Bad color depth\n");
223: return;
224: }
225: dest_width *= MAGNIFY;
226: memset(colortab, 0xff, dest_width);
227: memset(colortab + dest_width, 0, dest_width);
228: if (s->flash) {
229: colors[0] = colortab;
230: colors[1] = colortab;
231: } else if (s->inverse) {
232: colors[0] = colortab;
233: colors[1] = colortab + dest_width;
234: } else {
235: colors[0] = colortab + dest_width;
236: colors[1] = colortab;
237: }
238: dest = s->ds->data;
239: for (y = 0; y < 16; y++) {
240: line = (y + s->start_line) & 63;
241: src = s->framebuffer + 132 * (line >> 3) + 36;
242: mask = 1 << (line & 7);
243: for (x = 0; x < 96; x++) {
244: memcpy(dest, colors[(*src & mask) != 0], dest_width);
245: dest += dest_width;
246: src++;
247: }
248: for (x = 1; x < MAGNIFY; x++) {
249: memcpy(dest, dest - dest_width * 96, dest_width * 96);
250: dest += dest_width * 96;
251: }
252: }
253: }
254: dpy_update(s->ds, 0, 0, 96 * MAGNIFY, 16 * MAGNIFY);
255: }
256:
257: static void ssd0303_invalidate_display(void * opaque)
258: {
259: ssd0303_state *s = (ssd0303_state *)opaque;
260: s->redraw = 1;
261: }
262:
263: void ssd0303_init(DisplayState *ds, i2c_bus *bus, int address)
264: {
265: ssd0303_state *s;
266:
267: s = (ssd0303_state *)i2c_slave_init(bus, address, sizeof(ssd0303_state));
268: s->ds = ds;
269: s->i2c.event = ssd0303_event;
270: s->i2c.recv = ssd0303_recv;
271: s->i2c.send = ssd0303_send;
272: graphic_console_init(ds, ssd0303_update_display, ssd0303_invalidate_display,
273: NULL, s);
274: dpy_resize(s->ds, 96 * MAGNIFY, 16 * MAGNIFY);
275: }
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