-
Notifications
You must be signed in to change notification settings - Fork 0
/
calc.cpp
369 lines (330 loc) · 8.78 KB
/
calc.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
#include "common.h"
#include "data.h"
/* Defines */
#define RADIX 10
#define LENGTH_MAX 8
#define STACK_SIZE 16
#define DECODE_MAX 12
#define BIG_NUMBER 999999999UL
#define EXP_MAX 99
/* Typedefs */
typedef struct {
int32_t m;
int8_t exp;
} NUM_T;
/* Local Functions */
static void prepareNumber(void);
static bool modifyNumber(uint8_t button);
static bool enterNumber(void);
static bool clearNumber(void);
static bool operate(void (*opFunc)(NUM_T *a, NUM_T *b));
static void add(NUM_T *a, NUM_T *b);
static void sub(NUM_T *a, NUM_T *b);
static void multi(NUM_T *a, NUM_T *b);
static void div(NUM_T *a, NUM_T *b);
static void setZero(NUM_T *n);
static int8_t getLength(NUM_T *n);
static void align(NUM_T *a, NUM_T *b);
static void normalize(NUM_T *n);
static int8_t decodeNumber(NUM_T *n);
static void drawStack(uint8_t *pBuffer);
static void drawNumber(uint8_t *pBuffer, int16_t x, int8_t row);
static void drawEntering(uint8_t *pBuffer);
/* Local Variables */
PROGMEM static void (*const opFuncTable[])(NUM_T *a, NUM_T *b) = {
add, sub, multi, div
};
static NUM_T stack[STACK_SIZE], *pStack;
static uint8_t decodeBuffer[DECODE_MAX];
static bool isEntering, isDotted, isError;
/*---------------------------------------------------------------------------*/
/* Main Functions */
/*---------------------------------------------------------------------------*/
void initCalc(void)
{
pStack = &stack[0];
prepareNumber();
isError = false;
}
bool updateCalc(uint8_t button)
{
if (button == BTN_ALLCLEAR) {
initCalc();
return true;
} else if (button == BTN_CLEAR) {
return clearNumber();
} else if (!isError) {
if (button == BTN_ENTER) {
return enterNumber();
} else if (button >= BTN_PLUS && button <= BTN_DIV) {
void *opFunc = pgm_read_ptr(&opFuncTable[button - BTN_PLUS]);
return operate((void (*)(NUM_T *a, NUM_T *b))opFunc);
} else {
return modifyNumber(button);
}
}
return false;
}
void drawCalc(int16_t y, uint8_t *pBuffer)
{
clearScreenBuffer();
if (y == 0) {
drawStack(pBuffer);
decodeNumber(pStack);
} else {
drawNumber(pBuffer, WIDTH + IMG_PADDING, (y - 8) >> 3);
if (y == 8 && isEntering) drawEntering(pBuffer);
}
}
/*---------------------------------------------------------------------------*/
/* Control Functions */
/*---------------------------------------------------------------------------*/
static void prepareNumber(void)
{
setZero(pStack);
isEntering = true;
isDotted = false;
}
static bool modifyNumber(uint8_t button)
{
bool ret = false;
if (!isEntering && pStack < &stack[STACK_SIZE - 1]) {
pStack++;
prepareNumber();
ret = true;
}
if (isEntering) {
if (button >= BTN_0 && button <= BTN_9) {
if (getLength(pStack) < LENGTH_MAX && 1 - pStack->exp < LENGTH_MAX) {
int8_t num = button - BTN_0;
if (pStack->m < 0) num = -num;
pStack->m = pStack->m * RADIX + num;
if (isDotted) pStack->exp--;
ret = true;
}
} else if (button == BTN_DOT) {
if (!isDotted) {
isDotted = true;
ret = true;
}
} else if (button == BTN_INVERT) {
if (pStack->m != 0) {
pStack->m = -pStack->m;
ret = true;
}
}
}
return ret;
}
static bool enterNumber(void)
{
if (isEntering) {
normalize(pStack);
isEntering = false;
} else if (pStack < &stack[STACK_SIZE - 1]) {
pStack++;
*pStack = *(pStack - 1);
}
return true;
}
static bool clearNumber(void)
{
if (pStack > &stack[0]) {
pStack--;
isEntering = false;
} else {
prepareNumber();
}
isError = false;
return true;
}
static bool operate(void (*opFunc)(NUM_T *a, NUM_T *b))
{
bool ret = false;
if (pStack > &stack[0]) {
if (isEntering) normalize(pStack);
pStack--;
opFunc(pStack, pStack + 1);
normalize(pStack);
if (pStack->exp > 0) isError = true; // too large
isEntering = false;
ret = true;
}
return ret;
}
static void add(NUM_T *a, NUM_T *b)
{
align(a, b);
a->m += b->m;
}
static void sub(NUM_T *a, NUM_T *b)
{
align(a, b);
a->m -= b->m;
}
static void multi(NUM_T *a, NUM_T *b)
{
int32_t mA = abs(a->m), mB = abs(b->m);
if (mB != 0) {
while (BIG_NUMBER / mB < mA) {
a->exp++;
if (mA % RADIX == 0) {
mA /= RADIX;
} else if (mB % RADIX == 0 || mB > mA) {
mB /= RADIX;
} else {
mA /= RADIX;
}
}
}
a->m = ((a->m < 0) == (b->m < 0)) ? mA * mB : -mA * mB;
a->exp += b->exp;
}
static void div(NUM_T *a, NUM_T *b)
{
if (b->m == 0) {
a->m = BIG_NUMBER;
a->exp = EXP_MAX;
isError = true;
return;
}
int32_t odd = a->m % b->m;
a->m /= b->m;
a->exp -= b->exp;
int8_t len = getLength(a);
while (odd != 0 && len < LENGTH_MAX) {
odd *= RADIX;
int32_t d = odd / b->m;
a->m = a->m * RADIX + d;
len += (a->m != 0);
a->exp--;
odd -= d * b->m;
}
}
static void setZero(NUM_T *n)
{
n->m = 0;
n->exp = 0;
}
static int8_t getLength(NUM_T *n)
{
int8_t len = 0;
int32_t m = abs(n->m);
int32_t z = 1;
while (m >= z) {
len++;
z *= RADIX;
}
return len;
}
static void align(NUM_T *a, NUM_T *b)
{
if (a->exp < b->exp) {
align(b, a);
return;
}
int8_t len = getLength(a);
while (a->exp > b->exp) {
if (len < LENGTH_MAX) {
len++;
a->exp--;
a->m *= RADIX;
} else {
b->exp++;
b->m /= RADIX;
}
}
}
static void normalize(NUM_T *n)
{
if (n->m == 0) {
setZero(n);
return;
}
int8_t len = getLength(n);
while (len > LENGTH_MAX || n->exp < 0 && n->m % RADIX == 0) {
len--;
n->exp++;
n->m /= RADIX;
}
while (n->exp > 0 && len < LENGTH_MAX) {
len++;
n->exp--;
n->m *= RADIX;
}
if (len + n->exp <= 1 - LENGTH_MAX) setZero(n); // too small
}
/*---------------------------------------------------------------------------*/
/* Draw Functions */
/*---------------------------------------------------------------------------*/
static int8_t decodeNumber(NUM_T *n)
{
uint8_t *pBuf = decodeBuffer;
int32_t m = abs(n->m);
int8_t len = getLength(n) + (m == 0);
int8_t exp = n->exp;
if (len < 1 - exp) len = 1 - exp;
if (exp > 0) {
*pBuf++ = IMG_ID_BAR;
*pBuf++ = IMG_ID_E;
*pBuf++ = IMG_ID_BAR;
} else {
while (len > 0) {
if (len <= LENGTH_MAX) {
if (exp == 0) *pBuf++ = IMG_ID_DOT;
*pBuf++ = m % RADIX;
}
len--;
exp++;
m /= RADIX;
}
if (n->m < 0) *pBuf++ = IMG_ID_BAR;
}
*pBuf = IMG_ID_MAX;
return pBuf - decodeBuffer;
}
static void drawStack(uint8_t *pBuffer)
{
int16_t x = WIDTH + IMG_SUB_PADDING;
for (NUM_T *n = pStack - 1; n >= &stack[0] && x >= STACK_SIZE * 2; n--) {
int16_t len = decodeNumber(n);
drawNumber(pBuffer, x, -1);
x -= (len + 1) * (IMG_SUB_DIGIT_W + IMG_SUB_PADDING) - (IMG_SUB_DIGIT_W - IMG_SUB_DOT_W);
}
int8_t stackPos = &stack[STACK_SIZE - 1] - pStack;
uint8_t *p = pBuffer;
*p++ = 0x7F;
for (int8_t i = 0; i < STACK_SIZE - 1; i++) {
if (i >= stackPos) {
*p++ = 0x55;
*p++ = 0x6B;
} else {
*p++ = 0x41;
*p++ = 0x41;
}
}
*p++ = 0x7F;
}
static void drawNumber(uint8_t *pBuffer, int16_t x, int8_t row)
{
for (uint8_t *pBuf = decodeBuffer; *pBuf < IMG_ID_MAX; pBuf++) {
const uint8_t *pImg;
int8_t w;
if (row >= 0) {
pImg = &imgDigit[*pBuf][row * IMG_DIGIT_W];
w = (*pBuf == IMG_ID_DOT) ? IMG_DOT_W : IMG_DIGIT_W;
x -= IMG_PADDING;
} else {
pImg = imgSubDigit[*pBuf];
w = (*pBuf == IMG_ID_DOT) ? IMG_SUB_DOT_W : IMG_SUB_DIGIT_W;
x -= IMG_SUB_PADDING;
}
x -= w;
if (x < 0) break;
memcpy_P(&pBuffer[x], pImg, w);
}
}
static void drawEntering(uint8_t *pBuffer)
{
memcpy_P(&pBuffer[0], imgEntering, IMG_ENTERING_W);
}