source: buchla-68k/vlib/glcinit.c@ 9bf0f86

Last change on this file since 9bf0f86 was f40a309, checked in by Thomas Lopatic <thomas@…>, 7 years ago

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[f40a309]1/*
2 =============================================================================
3 glcinit.c -- LCD drivers for the Epson GLC controller chip
4 Version 5 -- 1988-08-03 -- D.N. Lynx Crowe
5 (c) Copyright 1987, 1988 -- D.N. Lynx Crowe
6
7 GLCinit()
8
9 Initializes the GLC.
10
11 unsigned
12 GLCcrc(row, col)
13 unsigned row, col;
14
15 Positions the GLC cursor at ('row', 'col') preparatory
16 to writing text. Returns the calculated cursor address.
17
18 unsigned
19 GLCcxy(x, y)
20 unsigned x, y;
21
22 Positions the GLC cursor at ('x', 'y') preparatory to
23 writing graphics. Returns a bit mask for the pixel.
24 Leaves the cursor address in lcdcurs.
25 Limits: 0 LE x LE 511, 0 LE y LE 63.
26
27 GLCwrts(s)
28 char *s;
29
30 Writes the character string pointed to by 's' at the
31 current cursor position on the LCD display.
32 Cursor must start and end on the same line.
33 No error checks are done.
34
35 GLCtext(row, col, s)
36 unsigned row, col;
37 char *s;
38
39 Sets the GLC cursor to ('row', 'col'), then writes the
40 character string pointed to by 's'.
41 Cursor must start and end on the same line.
42 No error checks are done.
43
44
45 GLCdisp(dsp, crs, blk1, blk2, blk3)
46 short dsp, crs, blk1, blk2, blk3;
47
48 Sets the overall display, cursor and block status values.
49
50 GLCcurs(crs)
51 short crs;
52
53 Turns the cursor on or off.
54 =============================================================================
55*/
56
57/*
58
59*/
60
61#include "stddefs.h"
62#include "hwdefs.h"
63#include "glcdefs.h"
64
65unsigned lcdbase; /* LCD graphics base address */
66unsigned lcdbit; /* LCD graphics pixel bit mask */
67unsigned lcdcol; /* LCD text column */
68unsigned lcdctl1; /* LCD display control -- command */
69unsigned lcdctl2; /* LCD display control -- data */
70unsigned lcdcurs; /* LCD graphics pixel byte address */
71unsigned lcdrow; /* LCD text row */
72unsigned lcdx; /* LCD graphics x */
73unsigned lcdy; /* LCD graphics y */
74
75/* GLC initialization values */
76
77char glc_is1[] = { 0x12, 0x05, 0x07, 0x54, 0x58, 0x3F, 0x55, 0x00 };
78char glc_is2[] = { 0x00, 0x00, 0x3F, 0x00, 0x20, 0x3F, 0x00, 0x00 };
79
80/*
81
82*/
83
84/*
85 =============================================================================
86 GLCdisp(dsp, crs, blk1, blk2, blk3) -- set GLC display status
87 Sets the overall display, cursor and block status values.
88 =============================================================================
89*/
90
91GLCdisp(dsp, crs, blk1, blk2, blk3)
92short dsp, crs, blk1, blk2, blk3;
93{
94 register short val;
95
96 val = ((blk3 & 3) << 6) | ((blk2 & 3) << 4) | ((blk1 & 3) << 2) |
97 (crs & 3);
98
99 lcdctl1 = G_DSPCTL | (dsp & 1);
100 lcdctl2 = val;
101
102 LCD_WC = lcdctl1;
103 LCD_WD = lcdctl2;
104
105}
106
107/*
108 =============================================================================
109 GLCcurs() -- turns the cursor on or off
110 =============================================================================
111*/
112
113GLCcurs(crs)
114short crs;
115{
116 lcdctl2 = (crs & 3) | (lcdctl2 & ~3);
117
118 LCD_WC = lcdctl1;
119 LCD_WD = lcdctl2;
120}
121
122/*
123
124*/
125
126/*
127 =============================================================================
128 GLCinit() -- initialize GLC
129 Initializes the GLC.
130 =============================================================================
131*/
132
133GLCinit()
134{
135 register int i;
136 register long ic;
137 register char *gp;
138
139 lcdbase = G_PLANE2; /* set defaults for graphics variables */
140 lcdx = 0;
141 lcdy = 0;
142 lcdbit = 0x01;
143
144 lcdrow = 0; /* set default for text variables */
145 lcdcol = 0;
146
147 lcdctl1 = G_DSPCTL;
148 lcdctl2 = 0;
149
150 LCD_WC = G_INIT; /* initialize the GLC */
151 gp = &glc_is1[0];
152
153 for (i = 0; i < 8; i++)
154 LCD_WD= *gp++;
155
156 LCD_WC = G_SETSAD; /* setup scroll registers */
157 gp = &glc_is2[0];
158
159 for (i = 0; i < 8; i++)
160 LCD_WD = *gp++;
161
162 LCD_WC = G_HSCRL; /* clear the horizontal scroll counter */
163 LCD_WD = 0;
164
165 LCD_WC = G_OVRLAY; /* setup the display mode */
166 LCD_WD = 0x08;
167
168 GLCdisp(G_OFF, G_B2, G_ON, G_ON, G_OFF);
169
170/*
171
172*/
173 LCD_WC = G_CRSWR; /* set cursor at (0,0) in G_PLANE1 */
174 LCD_WD = G_PLANE1 & 0xFF;
175 LCD_WD = (G_PLANE1 >> 8) & 0xFF;
176
177 LCD_WC = G_CRSMRT; /* set cursor motion forward */
178
179 LCD_WC = G_MWRITE; /* write zeros to GLC RAM */
180
181 for (ic = 0; ic < 65536L; ic++)
182 LCD_WD = 0;
183
184 LCD_WC = G_CRSWR; /* set cursor to (0,0) in G_PLANE1 */
185 LCD_WD = G_PLANE1 & 0xFF;
186 LCD_WD = (G_PLANE1 >> 8) & 0xFF;
187
188 LCD_WC = G_CRSFRM; /* setup a blinking underline cursor */
189 LCD_WD = 0x04;
190 LCD_WD = 0x06;
191
192 /* enable display */
193
194 GLCdisp(G_ON, G_B2, G_ON, G_ON, G_OFF);
195}
196
197/*
198
199*/
200
201/*
202 =============================================================================
203 GLCcrc(row, col) -- position GLC text cursor
204 Positions the GLC cursor at ('row', 'col') preparatory
205 to writing text. Returns calculated cursor address.
206 =============================================================================
207*/
208
209unsigned
210GLCcrc(row, col)
211unsigned row, col;
212{
213 unsigned curad;
214
215 curad = col + (row * 85); /* calculate cursor location */
216
217 LCD_WC = G_CRSWR; /* send cursor address to GLC */
218 LCD_WD = curad & 0xFF;
219 LCD_WD = (curad >> 8) & 0xFF;
220
221 lcdrow = row; /* set text cursor variables */
222 lcdcol = col;
223
224 return(curad); /* return calculated cursor address */
225}
226
227/*
228
229*/
230
231/*
232 =============================================================================
233 GLCcxy(x, y) -- position GLC graphics cursor
234 Positions the GLC cursor at ('x', 'y') preparatory to
235 writing graphics. Returns a bit mask for the pixel.
236 Leaves cursor address in lcdcurs.
237 Limits: 0 LE x LE 511, 0 LE y LE 63.
238 =============================================================================
239*/
240
241unsigned
242GLCcxy(x, y)
243register unsigned x, y;
244{
245 register unsigned curad, xby6;
246
247 /* calculate cursor address */
248
249 xby6 = x % 6;
250 curad = lcdbase + (85 * (63 - y)) + (x / 6) + (xby6 >> 3);
251 lcdcurs = curad;
252
253 /* send cursor address to GLC */
254
255 LCD_WC = G_CRSWR;
256 LCD_WD = curad & 0xFF;
257 LCD_WD = (curad >> 8) & 0xFF;
258
259 /* set graphics variables */
260
261 lcdx = x;
262 lcdy = y;
263
264 /* calculate bit mask */
265
266 lcdbit = 0x01 << (xby6 & 0x07);
267
268 return(lcdbit);
269}
270
271/*
272
273*/
274
275/*
276 =============================================================================
277 GLCwrts(s) -- write text string to GLC
278 Writes the character string pointed to by 's' at the
279 current cursor position on the LCD display.
280 Cursor must start and end on the same line.
281 No error checks are done.
282 =============================================================================
283*/
284
285GLCwrts(s)
286register char *s;
287{
288 LCD_WC = G_CRSMRT; /* set cursor motion = right */
289
290 LCD_WC = G_MWRITE; /* set to write data */
291
292 while (*s) { /* write string to GLC */
293
294 LCD_WD = *s++;
295 lcdcol++; /* keep column variable up to date */
296 }
297}
298
299/*
300
301*/
302
303/*
304 =============================================================================
305 GLCtext(row, col, s) -- position GLC cursor and write text
306 Sets the GLC cursor to ('row', 'col'), then writes the
307 character string pointed to by 's'.
308 Cursor must start and end on the same line.
309 No error checks are done.
310 =============================================================================
311*/
312
313GLCtext(row, col, s)
314register unsigned row, col;
315register char *s;
316{
317 register unsigned curad;
318
319 curad = col + (row * 85); /* calculate cursor address */
320
321 LCD_WC = G_CRSWR; /* send cursor address to GLC */
322 LCD_WD = curad & 0xFF;
323 LCD_WD = (curad >> 8) & 0xFF;
324
325 lcdrow = row; /* set GLC text cursor variables */
326 lcdcol = col;
327
328 LCD_WC = G_CRSMRT; /* set cursor motion = right */
329
330 LCD_WC = G_MWRITE; /* set to write data */
331
332 while (*s) { /* write string to GLC */
333
334 LCD_WD = *s++;
335 lcdcol++; /* keep cursor column up to date */
336 }
337}
338
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