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Rev Author Line No. Line
199 Kevin 1 
#include "defines.h"
2 
#include "CUBE.h"
3 
#include "SPI1.h"
206 Kevin 4 
#include "glcdfont.h"
213 Kevin 5 
#include "UART1.h"
199 Kevin 6 
 
7 
static CUBE_DATA *cube_data_ptr;
8 
 
9 
inline void Cube_Delay() {
10 
    // Small delay to ensure that latch speeds are < 30Mhz
11 
    Nop();
12 
    Nop();
13 
    Nop();
14 
}
15 
 
231 Kevin 16 
void Cube_Init(CUBE_DATA *data, uint8_t BC) {
199 Kevin 17 
    cube_data_ptr = data;
201 Kevin 18 
    cube_data_ptr->current_layer = 0;
205 Kevin 19 
    cube_data_ptr->rotation_counter = 0;
212 Kevin 20 
    cube_data_ptr->frame_state = IDLE;
21 
    cube_data_ptr->frame_escape = 0;
199 Kevin 22 
 
23 
    SFT_D = 0;
24 
    SFT_S = 0;
25 
    SFT_K = 0;
26 
    SFT_R = 0;
27 
    GSLAT = 0;
28 
    XBLNK = 0;
29 
 
30 
    SFT_D_TRIS = 0;
31 
    SFT_S_TRIS = 0;
32 
    SFT_K_TRIS = 0;
33 
    SFT_R_TRIS = 0;
34 
    GSLAT_TRIS = 0;
35 
    XBLNK_TRIS = 0;
36 
 
37 
    // Clear the shift register
38 
    Cube_Delay();
39 
    SFT_K = 1;
40 
    Cube_Delay();
41 
    SFT_K = 0;
42 
    Cube_Delay();
43 
    SFT_S = 1;
44 
    Cube_Delay();
45 
    SFT_S = 0;
46 
    Cube_Delay();
47 
    SFT_R = 1;
48 
 
200 Kevin 49 
    Cube_Write_DCS(BC);
199 Kevin 50 
    Cube_Clear();
206 Kevin 51 
    Cube_Overlay_Clear();
199 Kevin 52 
}
53 
 
54 
void Cube_Timer_Interrupt(void) {
206 Kevin 55 
    // OR values in the overlay array with the display array
231 Kevin 56 
    uint8_t i;
57 
    uint16_t j;
206 Kevin 58 
    for (i = 0; i < CUBE_LAYER_COUNT; i++) {
59 
        for (j = 0; j < GCS_LAYER_SIZE; j++) {
60 
            cube_data_ptr->GCS_WRITE[i][j] = cube_data_ptr->GCS[i][j] | cube_data_ptr->GCS_OVERLAY[i][j];
61 
        }
62 
    }
199 Kevin 63 
    // Write to the GCS register
206 Kevin 64 
    SPI1_Write(cube_data_ptr->GCS_WRITE[cube_data_ptr->current_layer], GCS_LAYER_SIZE, &Cube_GCS_Write_Callback);
199 Kevin 65 
}
66 
 
212 Kevin 67 
////////////////////////
68 
// Callback functions //
69 
////////////////////////
70 
 
199 Kevin 71 
void Cube_DCS_Write_Callback(void) {
72 
    // GSLAT must be >7ms after DCS write
73 
    Delay_MS(7);
74 
    GSLAT = 0;
75 
    Cube_Delay();
76 
    GSLAT = 1;
77 
    Cube_Delay();
78 
    GSLAT = 0;
79 
}
80 
 
81 
void Cube_GCS_Write_Callback(void) {
82 
    // Disable LED output and latch in written data to GCS
83 
    XBLNK = 0;
84 
    Cube_Delay();
85 
    GSLAT = 1;
86 
    // Set the shift register to turn on the current layer
231 Kevin 87 
    uint8_t i;
199 Kevin 88 
    for (i = 0; i < CUBE_LAYER_COUNT; i++) {
89 
        Cube_Delay();
201 Kevin 90 
        SFT_D = (i == CUBE_LAYER_COUNT - cube_data_ptr->current_layer - 1) ? 1 : 0;
199 Kevin 91 
        Cube_Delay();
92 
        SFT_K = 1;
93 
        Cube_Delay();
94 
        SFT_K = 0;
95 
    }
96 
    Cube_Delay();
97 
    SFT_S = 1;
98 
    Cube_Delay();
99 
    SFT_S = 0;
100 
    Cube_Delay();
101 
    // Enable LED output
102 
    XBLNK = 1;
103 
    Cube_Delay();
104 
    GSLAT = 0;
105 
 
201 Kevin 106 
    cube_data_ptr->current_layer = (cube_data_ptr->current_layer == CUBE_LAYER_COUNT-1)
107 
            ? 0 : cube_data_ptr->current_layer + 1;
199 Kevin 108 
}
109 
 
212 Kevin 110 
////////////////////////////
111 
// Cube control functions //
112 
////////////////////////////
113 
 
231 Kevin 114 
void Cube_Write_DCS(uint8_t BC) {
200 Kevin 115 
    XBLNK = 0;
231 Kevin 116 
    uint8_t i,j;
200 Kevin 117 
    // Write configuration data to the DC/BC/FC/UD registers
231 Kevin 118 
    uint8_t DCS[GCS_LAYER_SIZE] = {0};
200 Kevin 119 
    for (i = 0; i < 8; i++) {
231 Kevin 120 
        uint16_t offset = i * GCS_REG_SIZE;
200 Kevin 121 
 
122 
        for (j = 0; j < 21; j++) {
123 
            DCS[offset + j] = 0xFF; // Dot correction
124 
        }
125 
 
126 
        // Warning: do not set BC > 0x6F
127 
        DCS[offset + 21] = BC; // Global red brightness
128 
        DCS[offset + 22] = BC; // Global green brightness
129 
        DCS[offset + 23] = BC; // Global blue brightness
130 
 
131 
        // DC low range, auto repeat, no timing reset, 8 bit counter mode
132 
        DCS[offset + 24] = 0x68; // 0110 1000
133 
    }
134 
 
135 
    GSLAT = 1;
136 
    SPI1_Write(DCS, GCS_LAYER_SIZE, &Cube_DCS_Write_Callback);
201 Kevin 137 
    Delay_MS(10); // Delay until the entire DCS write is finished
200 Kevin 138 
}
139 
 
199 Kevin 140 
void Cube_Clear(void) {
231 Kevin 141 
    uint8_t i;
142 
    uint16_t j;
199 Kevin 143 
    for (i = 0; i < CUBE_LAYER_COUNT; i++)
144 
        for (j = 0; j < GCS_LAYER_SIZE; j++)
145 
            cube_data_ptr->GCS[i][j] = 0x00;
146 
}
147 
 
231 Kevin 148 
void Cube_Set_All(uint16_t R, uint16_t G, uint16_t B) {
201 Kevin 149 
    // Set all pixels in the cube to the given color
199 Kevin 150 
    R &= 0x0FFF;
151 
    G &= 0x0FFF;
152 
    B &= 0x0FFF;
231 Kevin 153 
    uint8_t i,j,k;
199 Kevin 154 
    for (i = 0; i < CUBE_LAYER_COUNT; i++) {
155 
        for (j = 0; j < CUBE_ROW_COUNT; j++) {
231 Kevin 156 
            uint16_t j_var = j * GCS_REG_SIZE;
199 Kevin 157 
            for (k = 0; k < 4; k++) {
231 Kevin 158 
                uint16_t k_var = j_var + (k * 9);
199 Kevin 159 
                cube_data_ptr->GCS[i][k_var+0] = R & 0xFF;;
160 
                cube_data_ptr->GCS[i][k_var+1] = (G << 4) | (R >> 8);
161 
                cube_data_ptr->GCS[i][k_var+2] = G >> 4;
162 
                cube_data_ptr->GCS[i][k_var+3] = B & 0xFF;
163 
                cube_data_ptr->GCS[i][k_var+4] = (R << 4) | (B >> 8);
164 
                cube_data_ptr->GCS[i][k_var+5] = R >> 4;
165 
                cube_data_ptr->GCS[i][k_var+6] = G & 0xFF;
166 
                cube_data_ptr->GCS[i][k_var+7] = (B << 4) | (G >> 8);
167 
                cube_data_ptr->GCS[i][k_var+8] = B >> 4;
168 
            }
169 
        }
170 
    }
171 
}
172 
 
231 Kevin 173 
void Cube_Set_Layer(uint8_t layer, uint16_t R, uint16_t G, uint16_t B) {
201 Kevin 174 
    // Set all pixels in the specified layer to the given color
199 Kevin 175 
    R &= 0x0FFF;
176 
    G &= 0x0FFF;
177 
    B &= 0x0FFF;
231 Kevin 178 
    uint8_t i,j;
199 Kevin 179 
    for (i = 0; i < CUBE_ROW_COUNT; i++) {
231 Kevin 180 
        uint16_t i_var = i * GCS_REG_SIZE;
199 Kevin 181 
        for (j = 0; j < 4; j++) {
231 Kevin 182 
            uint16_t j_var = i_var + (j * 9);
199 Kevin 183 
            cube_data_ptr->GCS[layer][j_var+0] = R & 0xFF;;
184 
            cube_data_ptr->GCS[layer][j_var+1] = (G << 4) | (R >> 8);
185 
            cube_data_ptr->GCS[layer][j_var+2] = G >> 4;
186 
            cube_data_ptr->GCS[layer][j_var+3] = B & 0xFF;
187 
            cube_data_ptr->GCS[layer][j_var+4] = (R << 4) | (B >> 8);
188 
            cube_data_ptr->GCS[layer][j_var+5] = R >> 4;
189 
            cube_data_ptr->GCS[layer][j_var+6] = G & 0xFF;
190 
            cube_data_ptr->GCS[layer][j_var+7] = (B << 4) | (G >> 8);
191 
            cube_data_ptr->GCS[layer][j_var+8] = B >> 4;
192 
        }
193 
    }
194 
}
195 
 
231 Kevin 196 
void Cube_Set_Pixel(uint8_t layer, uint8_t row, uint8_t column, uint16_t R, uint16_t G, uint16_t B) {
201 Kevin 197 
    // Set the specified pixel to the given color
199 Kevin 198 
    R &= 0x0FFF;
199 
    G &= 0x0FFF;
200 
    B &= 0x0FFF;
231 Kevin 201 
    uint16_t var = row * GCS_REG_SIZE + (column / 2 * 9);
199 Kevin 202 
    switch (column % 2) {
203 
        case 0:
204 
            cube_data_ptr->GCS[layer][var+0] = R & 0xFF;
205 
            cube_data_ptr->GCS[layer][var+1] = (G << 4) | (R >> 8);
206 
            cube_data_ptr->GCS[layer][var+2] = G >> 4;
207 
            cube_data_ptr->GCS[layer][var+3] = B & 0xFF;
208 
            cube_data_ptr->GCS[layer][var+4] = (cube_data_ptr->GCS[layer][var+4] & 0xF0) | (B >> 8);
209 
            break;
210 
        case 1:
211 
            cube_data_ptr->GCS[layer][var+4] = (cube_data_ptr->GCS[layer][var+4] & 0x0F) | (R << 4);
212 
            cube_data_ptr->GCS[layer][var+5] = R >> 4;
213 
            cube_data_ptr->GCS[layer][var+6] = G & 0xFF;
214 
            cube_data_ptr->GCS[layer][var+7] = (B << 4) | (G >> 8);
215 
            cube_data_ptr->GCS[layer][var+8] = B >> 4;
216 
            break;
217 
    }
205 Kevin 218 
}
219 
 
231 Kevin 220 
void Cube_Get_Pixel(uint8_t layer, uint8_t row, uint8_t column, uint16_t* R, uint16_t* G, uint16_t* B) {
221 
    uint16_t var = row * GCS_REG_SIZE + (column / 2 * 9);
205 Kevin 222 
    switch (column % 2) {
223 
        // Concatenate lower byte and upper byte of each color channel
224 
        case 0:
225 
            *R = cube_data_ptr->GCS[layer][var+0] | ((cube_data_ptr->GCS[layer][var+1] & 0x0F) << 8);
226 
            *G = (cube_data_ptr->GCS[layer][var+1] >> 4) | (cube_data_ptr->GCS[layer][var+2] << 4);
227 
            *B = cube_data_ptr->GCS[layer][var+3] | ((cube_data_ptr->GCS[layer][var+4] & 0x0F) << 8);
228 
            break;
229 
        case 1:
230 
            *R = (cube_data_ptr->GCS[layer][var+4] >> 4) | (cube_data_ptr->GCS[layer][var+5] << 4);
231 
            *G = cube_data_ptr->GCS[layer][var+6] | ((cube_data_ptr->GCS[layer][var+7] & 0x0F) << 8);
232 
            *B = (cube_data_ptr->GCS[layer][var+7] >> 4) | (cube_data_ptr->GCS[layer][var+8] << 4);
233 
            break;
234 
    }
235 
}
236 
 
231 Kevin 237 
void Cube_Move_Pixel(uint8_t layer1, uint8_t row1, uint8_t column1, uint8_t layer2, uint8_t row2, uint8_t column2) {
206 Kevin 238 
    // Copies data from pixel 1 to pixel 2
205 Kevin 239 
    // Note: destination pixel value is overwritten
231 Kevin 240 
    uint16_t prev_R, prev_G, prev_B;
205 Kevin 241 
    Cube_Get_Pixel(layer1, row1, column1, &prev_R, &prev_G, &prev_B);
242 
    Cube_Set_Pixel(layer2, row2, column2, prev_R, prev_G, prev_B);
243 
}
244 
 
231 Kevin 245 
void Cube_Rotate_Shell(uint8_t shell, uint8_t direction) {
205 Kevin 246 
    // Shell is the layer to rotate, with the outermost being 0
231 Kevin 247 
    uint8_t layer;
248 
    uint16_t origin_R, origin_G, origin_B;
205 Kevin 249 
    for (layer = 0; layer < CUBE_LAYER_COUNT; layer++) {
206 Kevin 250 
        if (direction) {
251 
            switch(shell) {
252 
                case 0:
253 
                    // Rotate outermost layer
254 
                    Cube_Get_Pixel(layer, 0, 0, &origin_R, &origin_G, &origin_B);
255 
                    Cube_Move_Pixel(layer, 0, 1, layer, 0, 0);
256 
                    Cube_Move_Pixel(layer, 0, 2, layer, 0, 1);
257 
                    Cube_Move_Pixel(layer, 0, 3, layer, 0, 2);
258 
                    Cube_Move_Pixel(layer, 0, 4, layer, 0, 3);
259 
                    Cube_Move_Pixel(layer, 0, 5, layer, 0, 4);
260 
                    Cube_Move_Pixel(layer, 0, 6, layer, 0, 5);
261 
                    Cube_Move_Pixel(layer, 0, 7, layer, 0, 6);
262 
                    Cube_Move_Pixel(layer, 1, 7, layer, 0, 7);
263 
                    Cube_Move_Pixel(layer, 2, 7, layer, 1, 7);
264 
                    Cube_Move_Pixel(layer, 3, 7, layer, 2, 7);
265 
                    Cube_Move_Pixel(layer, 4, 7, layer, 3, 7);
266 
                    Cube_Move_Pixel(layer, 5, 7, layer, 4, 7);
267 
                    Cube_Move_Pixel(layer, 6, 7, layer, 5, 7);
268 
                    Cube_Move_Pixel(layer, 7, 7, layer, 6, 7);
269 
                    Cube_Move_Pixel(layer, 7, 6, layer, 7, 7);
270 
                    Cube_Move_Pixel(layer, 7, 5, layer, 7, 6);
271 
                    Cube_Move_Pixel(layer, 7, 4, layer, 7, 5);
272 
                    Cube_Move_Pixel(layer, 7, 3, layer, 7, 4);
273 
                    Cube_Move_Pixel(layer, 7, 2, layer, 7, 3);
274 
                    Cube_Move_Pixel(layer, 7, 1, layer, 7, 2);
275 
                    Cube_Move_Pixel(layer, 7, 0, layer, 7, 1);
276 
                    Cube_Move_Pixel(layer, 6, 0, layer, 7, 0);
277 
                    Cube_Move_Pixel(layer, 5, 0, layer, 6, 0);
278 
                    Cube_Move_Pixel(layer, 4, 0, layer, 5, 0);
279 
                    Cube_Move_Pixel(layer, 3, 0, layer, 4, 0);
280 
                    Cube_Move_Pixel(layer, 2, 0, layer, 3, 0);
281 
                    Cube_Move_Pixel(layer, 1, 0, layer, 2, 0);
282 
                    Cube_Set_Pixel(layer, 1, 0, origin_R, origin_G, origin_B);
283 
                    break;
284 
                case 1:
285 
                    // Rotate second to outermost layer
286 
                    Cube_Get_Pixel(layer, 1, 1, &origin_R, &origin_G, &origin_B);
287 
                    Cube_Move_Pixel(layer, 1, 2, layer, 1, 1);
288 
                    Cube_Move_Pixel(layer, 1, 3, layer, 1, 2);
289 
                    Cube_Move_Pixel(layer, 1, 4, layer, 1, 3);
290 
                    Cube_Move_Pixel(layer, 1, 5, layer, 1, 4);
291 
                    Cube_Move_Pixel(layer, 1, 6, layer, 1, 5);
292 
                    Cube_Move_Pixel(layer, 2, 6, layer, 1, 6);
293 
                    Cube_Move_Pixel(layer, 3, 6, layer, 2, 6);
294 
                    Cube_Move_Pixel(layer, 4, 6, layer, 3, 6);
295 
                    Cube_Move_Pixel(layer, 5, 6, layer, 4, 6);
296 
                    Cube_Move_Pixel(layer, 6, 6, layer, 5, 6);
297 
                    Cube_Move_Pixel(layer, 6, 5, layer, 6, 6);
298 
                    Cube_Move_Pixel(layer, 6, 4, layer, 6, 5);
299 
                    Cube_Move_Pixel(layer, 6, 3, layer, 6, 4);
300 
                    Cube_Move_Pixel(layer, 6, 2, layer, 6, 3);
301 
                    Cube_Move_Pixel(layer, 6, 1, layer, 6, 2);
302 
                    Cube_Move_Pixel(layer, 5, 1, layer, 6, 1);
303 
                    Cube_Move_Pixel(layer, 4, 1, layer, 5, 1);
304 
                    Cube_Move_Pixel(layer, 3, 1, layer, 4, 1);
305 
                    Cube_Move_Pixel(layer, 2, 1, layer, 3, 1);
306 
                    Cube_Set_Pixel(layer, 2, 1, origin_R, origin_G, origin_B);
307 
                    break;
308 
                case 2:
309 
                    // Rotate second to innermost layer
310 
                    Cube_Get_Pixel(layer, 2, 2, &origin_R, &origin_G, &origin_B);
311 
                    Cube_Move_Pixel(layer, 2, 3, layer, 2, 2);
312 
                    Cube_Move_Pixel(layer, 2, 4, layer, 2, 3);
313 
                    Cube_Move_Pixel(layer, 2, 5, layer, 2, 4);
314 
                    Cube_Move_Pixel(layer, 3, 5, layer, 2, 5);
315 
                    Cube_Move_Pixel(layer, 4, 5, layer, 3, 5);
316 
                    Cube_Move_Pixel(layer, 5, 5, layer, 4, 5);
317 
                    Cube_Move_Pixel(layer, 5, 4, layer, 5, 5);
318 
                    Cube_Move_Pixel(layer, 5, 3, layer, 5, 4);
319 
                    Cube_Move_Pixel(layer, 5, 2, layer, 5, 3);
320 
                    Cube_Move_Pixel(layer, 4, 2, layer, 5, 2);
321 
                    Cube_Move_Pixel(layer, 3, 2, layer, 4, 2);
322 
                    Cube_Set_Pixel(layer, 3, 2, origin_R, origin_G, origin_B);
323 
                    break;
324 
                case 3:
325 
                    // Rotate innermost layer
326 
                    Cube_Get_Pixel(layer, 3, 3, &origin_R, &origin_G, &origin_B);
327 
                    Cube_Move_Pixel(layer, 3, 4, layer, 3, 3);
328 
                    Cube_Move_Pixel(layer, 4, 4, layer, 3, 4);
329 
                    Cube_Move_Pixel(layer, 4, 3, layer, 4, 4);
330 
                    Cube_Set_Pixel(layer, 4, 3, origin_R, origin_G, origin_B);
331 
                    break;
332 
            }
333 
        } else {
334 
            switch(shell) {
335 
                case 0:
336 
                    // Rotate outermost layer
337 
                    Cube_Get_Pixel(layer, 0, 0, &origin_R, &origin_G, &origin_B);
338 
                    Cube_Move_Pixel(layer, 1, 0, layer, 0, 0);
339 
                    Cube_Move_Pixel(layer, 2, 0, layer, 1, 0);
340 
                    Cube_Move_Pixel(layer, 3, 0, layer, 2, 0);
341 
                    Cube_Move_Pixel(layer, 4, 0, layer, 3, 0);
342 
                    Cube_Move_Pixel(layer, 5, 0, layer, 4, 0);
343 
                    Cube_Move_Pixel(layer, 6, 0, layer, 5, 0);
344 
                    Cube_Move_Pixel(layer, 7, 0, layer, 6, 0);
345 
                    Cube_Move_Pixel(layer, 7, 1, layer, 7, 0);
346 
                    Cube_Move_Pixel(layer, 7, 2, layer, 7, 1);
347 
                    Cube_Move_Pixel(layer, 7, 3, layer, 7, 2);
348 
                    Cube_Move_Pixel(layer, 7, 4, layer, 7, 3);
349 
                    Cube_Move_Pixel(layer, 7, 5, layer, 7, 4);
350 
                    Cube_Move_Pixel(layer, 7, 6, layer, 7, 5);
351 
                    Cube_Move_Pixel(layer, 7, 7, layer, 7, 6);
352 
                    Cube_Move_Pixel(layer, 6, 7, layer, 7, 7);
353 
                    Cube_Move_Pixel(layer, 5, 7, layer, 6, 7);
354 
                    Cube_Move_Pixel(layer, 4, 7, layer, 5, 7);
355 
                    Cube_Move_Pixel(layer, 3, 7, layer, 4, 7);
356 
                    Cube_Move_Pixel(layer, 2, 7, layer, 3, 7);
357 
                    Cube_Move_Pixel(layer, 1, 7, layer, 2, 7);
358 
                    Cube_Move_Pixel(layer, 0, 7, layer, 1, 7);
359 
                    Cube_Move_Pixel(layer, 0, 6, layer, 0, 7);
360 
                    Cube_Move_Pixel(layer, 0, 5, layer, 0, 6);
361 
                    Cube_Move_Pixel(layer, 0, 4, layer, 0, 5);
362 
                    Cube_Move_Pixel(layer, 0, 3, layer, 0, 4);
363 
                    Cube_Move_Pixel(layer, 0, 2, layer, 0, 3);
364 
                    Cube_Move_Pixel(layer, 0, 1, layer, 0, 2);
365 
                    Cube_Set_Pixel(layer, 0, 1, origin_R, origin_G, origin_B);
366 
                    break;
367 
                case 1:
368 
                    // Rotate second to outermost layer
369 
                    Cube_Get_Pixel(layer, 1, 1, &origin_R, &origin_G, &origin_B);
370 
                    Cube_Move_Pixel(layer, 2, 1, layer, 1, 1);
371 
                    Cube_Move_Pixel(layer, 3, 1, layer, 2, 1);
372 
                    Cube_Move_Pixel(layer, 4, 1, layer, 3, 1);
373 
                    Cube_Move_Pixel(layer, 5, 1, layer, 4, 1);
374 
                    Cube_Move_Pixel(layer, 6, 1, layer, 5, 1);
375 
                    Cube_Move_Pixel(layer, 6, 2, layer, 6, 1);
376 
                    Cube_Move_Pixel(layer, 6, 3, layer, 6, 2);
377 
                    Cube_Move_Pixel(layer, 6, 4, layer, 6, 3);
378 
                    Cube_Move_Pixel(layer, 6, 5, layer, 6, 4);
379 
                    Cube_Move_Pixel(layer, 6, 6, layer, 6, 5);
380 
                    Cube_Move_Pixel(layer, 5, 6, layer, 6, 6);
381 
                    Cube_Move_Pixel(layer, 4, 6, layer, 5, 6);
382 
                    Cube_Move_Pixel(layer, 3, 6, layer, 4, 6);
383 
                    Cube_Move_Pixel(layer, 2, 6, layer, 3, 6);
384 
                    Cube_Move_Pixel(layer, 1, 6, layer, 2, 6);
385 
                    Cube_Move_Pixel(layer, 1, 5, layer, 1, 6);
386 
                    Cube_Move_Pixel(layer, 1, 4, layer, 1, 5);
387 
                    Cube_Move_Pixel(layer, 1, 3, layer, 1, 4);
388 
                    Cube_Move_Pixel(layer, 1, 2, layer, 1, 3);
389 
                    Cube_Set_Pixel(layer, 1, 2, origin_R, origin_G, origin_B);
390 
                    break;
391 
                case 2:
392 
                    // Rotate second to innermost layer
393 
                    Cube_Get_Pixel(layer, 2, 2, &origin_R, &origin_G, &origin_B);
394 
                    Cube_Move_Pixel(layer, 3, 2, layer, 2, 2);
395 
                    Cube_Move_Pixel(layer, 4, 2, layer, 3, 2);
396 
                    Cube_Move_Pixel(layer, 5, 2, layer, 4, 2);
397 
                    Cube_Move_Pixel(layer, 5, 3, layer, 5, 2);
398 
                    Cube_Move_Pixel(layer, 5, 4, layer, 5, 3);
399 
                    Cube_Move_Pixel(layer, 5, 5, layer, 5, 4);
400 
                    Cube_Move_Pixel(layer, 4, 5, layer, 5, 5);
401 
                    Cube_Move_Pixel(layer, 3, 5, layer, 4, 5);
402 
                    Cube_Move_Pixel(layer, 2, 5, layer, 3, 5);
403 
                    Cube_Move_Pixel(layer, 2, 4, layer, 2, 5);
404 
                    Cube_Move_Pixel(layer, 2, 3, layer, 2, 4);
405 
                    Cube_Set_Pixel(layer, 2, 3, origin_R, origin_G, origin_B);
406 
                    break;
407 
                case 3:
408 
                    // Rotate innermost layer
409 
                    Cube_Get_Pixel(layer, 3, 3, &origin_R, &origin_G, &origin_B);
410 
                    Cube_Move_Pixel(layer, 4, 3, layer, 3, 3);
411 
                    Cube_Move_Pixel(layer, 4, 4, layer, 4, 3);
412 
                    Cube_Move_Pixel(layer, 3, 4, layer, 4, 4);
413 
                    Cube_Set_Pixel(layer, 3, 4, origin_R, origin_G, origin_B);
414 
                    break;
415 
            }
205 Kevin 416 
        }
417 
    }
418 
}
419 
 
231 Kevin 420 
void Cube_Rotate(uint8_t direction) {
205 Kevin 421 
    // Rotate outermost layer
206 Kevin 422 
    Cube_Rotate_Shell(0, direction);
205 Kevin 423 
    // Rotate second to outermost layer
424 
    if ((cube_data_ptr->rotation_counter != 1) && (cube_data_ptr->rotation_counter != 5)) {
206 Kevin 425 
        Cube_Rotate_Shell(1, direction);
205 Kevin 426 
    }
427 
    // Rotate second to innermost layer
428 
    if ((cube_data_ptr->rotation_counter != 0) && (cube_data_ptr->rotation_counter != 2) &&
429 
        (cube_data_ptr->rotation_counter != 4) && (cube_data_ptr->rotation_counter != 6)) {
206 Kevin 430 
        Cube_Rotate_Shell(2, direction);
205 Kevin 431 
    }
432 
    // Rotate innermost layer
433 
    if ((cube_data_ptr->rotation_counter == 3) || (cube_data_ptr->rotation_counter == 7)) {
206 Kevin 434 
        Cube_Rotate_Shell(3, direction);
205 Kevin 435 
    }
436 
 
209 Kevin 437 
    if (direction == 0) {
438 
        cube_data_ptr->rotation_counter = (cube_data_ptr->rotation_counter == CUBE_ROTATIONS - 1)
439 
                ? 0 : cube_data_ptr->rotation_counter + 1;
440 
    } else {
441 
        cube_data_ptr->rotation_counter = (cube_data_ptr->rotation_counter == 0)
442 
                ? CUBE_ROTATIONS - 1 : cube_data_ptr->rotation_counter - 1;
443 
    }
206 Kevin 444 
}
445 
 
212 Kevin 446 
///////////////////////////////
447 
// Overlay control functions //
448 
///////////////////////////////
206 Kevin 449 
 
450 
void Cube_Overlay_Clear(void) {
231 Kevin 451 
    uint16_t i,j;
452 
    for (i = 0; i < CUBE_LAYER_COUNT; i++) {
453 
        for (j = 0; j < GCS_LAYER_SIZE; j++) {
206 Kevin 454 
            cube_data_ptr->GCS_OVERLAY[i][j] = 0x00;
231 Kevin 455 
        }
456 
    }
206 Kevin 457 
}
458 
 
231 Kevin 459 
void Cube_Overlay_Set_Pixel(uint8_t layer, uint8_t row, uint8_t column, uint16_t R, uint16_t G, uint16_t B) {
206 Kevin 460 
    // Set the specified pixel to the given color
461 
    R &= 0x0FFF;
462 
    G &= 0x0FFF;
463 
    B &= 0x0FFF;
231 Kevin 464 
    uint16_t var = row * GCS_REG_SIZE + (column / 2 * 9);
206 Kevin 465 
    switch (column % 2) {
466 
        case 0:
467 
            cube_data_ptr->GCS_OVERLAY[layer][var+0] = R & 0xFF;
468 
            cube_data_ptr->GCS_OVERLAY[layer][var+1] = (G << 4) | (R >> 8);
469 
            cube_data_ptr->GCS_OVERLAY[layer][var+2] = G >> 4;
470 
            cube_data_ptr->GCS_OVERLAY[layer][var+3] = B & 0xFF;
471 
            cube_data_ptr->GCS_OVERLAY[layer][var+4] = (cube_data_ptr->GCS_OVERLAY[layer][var+4] & 0xF0) | (B >> 8);
472 
            break;
473 
        case 1:
474 
            cube_data_ptr->GCS_OVERLAY[layer][var+4] = (cube_data_ptr->GCS_OVERLAY[layer][var+4] & 0x0F) | (R << 4);
475 
            cube_data_ptr->GCS_OVERLAY[layer][var+5] = R >> 4;
476 
            cube_data_ptr->GCS_OVERLAY[layer][var+6] = G & 0xFF;
477 
            cube_data_ptr->GCS_OVERLAY[layer][var+7] = (B << 4) | (G >> 8);
478 
            cube_data_ptr->GCS_OVERLAY[layer][var+8] = B >> 4;
479 
            break;
480 
    }
481 
}
482 
 
231 Kevin 483 
void Cube_Overlay_Get_Pixel(uint8_t layer, uint8_t row, uint8_t column, uint16_t* R, uint16_t* G, uint16_t* B) {
484 
    uint16_t var = row * GCS_REG_SIZE + (column / 2 * 9);
206 Kevin 485 
    switch (column % 2) {
486 
        // Concatenate lower byte and upper byte of each color channel
487 
        case 0:
488 
            *R = cube_data_ptr->GCS_OVERLAY[layer][var+0] | ((cube_data_ptr->GCS_OVERLAY[layer][var+1] & 0x0F) << 8);
489 
            *G = (cube_data_ptr->GCS_OVERLAY[layer][var+1] >> 4) | (cube_data_ptr->GCS_OVERLAY[layer][var+2] << 4);
490 
            *B = cube_data_ptr->GCS_OVERLAY[layer][var+3] | ((cube_data_ptr->GCS_OVERLAY[layer][var+4] & 0x0F) << 8);
491 
            break;
492 
        case 1:
493 
            *R = (cube_data_ptr->GCS_OVERLAY[layer][var+4] >> 4) | (cube_data_ptr->GCS_OVERLAY[layer][var+5] << 4);
494 
            *G = cube_data_ptr->GCS_OVERLAY[layer][var+6] | ((cube_data_ptr->GCS_OVERLAY[layer][var+7] & 0x0F) << 8);
495 
            *B = (cube_data_ptr->GCS_OVERLAY[layer][var+7] >> 4) | (cube_data_ptr->GCS_OVERLAY[layer][var+8] << 4);
496 
            break;
497 
    }
498 
}
499 
 
231 Kevin 500 
void Cube_Overlay_Move_Pixel(uint8_t layer1, uint8_t row1, uint8_t column1, uint8_t layer2, uint8_t row2, uint8_t column2) {
206 Kevin 501 
    // Copies data from pixel 1 to pixel 2
502 
    // Note: destination pixel value is overwritten
231 Kevin 503 
    uint16_t prev_R, prev_G, prev_B;
206 Kevin 504 
    Cube_Overlay_Get_Pixel(layer1, row1, column1, &prev_R, &prev_G, &prev_B);
505 
    Cube_Overlay_Set_Pixel(layer2, row2, column2, prev_R, prev_G, prev_B);
506 
}
507 
 
231 Kevin 508 
void Cube_Overlay_Rotate_Shell(uint8_t shell, uint8_t direction) {
206 Kevin 509 
    // Shell is the layer to rotate, with the outermost being 0
231 Kevin 510 
    uint8_t layer;
511 
    uint16_t origin_R, origin_G, origin_B;;
206 Kevin 512 
    for (layer = 0; layer < CUBE_LAYER_COUNT; layer++) {
513 
        if (direction) {
514 
            switch(shell) {
515 
                case 0:
516 
                    // Rotate outermost layer
517 
                    Cube_Overlay_Get_Pixel(layer, 0, 0, &origin_R, &origin_G, &origin_B);
518 
                    Cube_Overlay_Move_Pixel(layer, 0, 1, layer, 0, 0);
519 
                    Cube_Overlay_Move_Pixel(layer, 0, 2, layer, 0, 1);
520 
                    Cube_Overlay_Move_Pixel(layer, 0, 3, layer, 0, 2);
521 
                    Cube_Overlay_Move_Pixel(layer, 0, 4, layer, 0, 3);
522 
                    Cube_Overlay_Move_Pixel(layer, 0, 5, layer, 0, 4);
523 
                    Cube_Overlay_Move_Pixel(layer, 0, 6, layer, 0, 5);
524 
                    Cube_Overlay_Move_Pixel(layer, 0, 7, layer, 0, 6);
525 
                    Cube_Overlay_Move_Pixel(layer, 1, 7, layer, 0, 7);
526 
                    Cube_Overlay_Move_Pixel(layer, 2, 7, layer, 1, 7);
527 
                    Cube_Overlay_Move_Pixel(layer, 3, 7, layer, 2, 7);
528 
                    Cube_Overlay_Move_Pixel(layer, 4, 7, layer, 3, 7);
529 
                    Cube_Overlay_Move_Pixel(layer, 5, 7, layer, 4, 7);
530 
                    Cube_Overlay_Move_Pixel(layer, 6, 7, layer, 5, 7);
531 
                    Cube_Overlay_Move_Pixel(layer, 7, 7, layer, 6, 7);
532 
                    Cube_Overlay_Move_Pixel(layer, 7, 6, layer, 7, 7);
533 
                    Cube_Overlay_Move_Pixel(layer, 7, 5, layer, 7, 6);
534 
                    Cube_Overlay_Move_Pixel(layer, 7, 4, layer, 7, 5);
535 
                    Cube_Overlay_Move_Pixel(layer, 7, 3, layer, 7, 4);
536 
                    Cube_Overlay_Move_Pixel(layer, 7, 2, layer, 7, 3);
537 
                    Cube_Overlay_Move_Pixel(layer, 7, 1, layer, 7, 2);
538 
                    Cube_Overlay_Move_Pixel(layer, 7, 0, layer, 7, 1);
539 
                    Cube_Overlay_Move_Pixel(layer, 6, 0, layer, 7, 0);
540 
                    Cube_Overlay_Move_Pixel(layer, 5, 0, layer, 6, 0);
541 
                    Cube_Overlay_Move_Pixel(layer, 4, 0, layer, 5, 0);
542 
                    Cube_Overlay_Move_Pixel(layer, 3, 0, layer, 4, 0);
543 
                    Cube_Overlay_Move_Pixel(layer, 2, 0, layer, 3, 0);
544 
                    Cube_Overlay_Move_Pixel(layer, 1, 0, layer, 2, 0);
545 
                    Cube_Overlay_Set_Pixel(layer, 1, 0, origin_R, origin_G, origin_B);
546 
                    break;
547 
                case 1:
548 
                    // Rotate second to outermost layer
549 
                    Cube_Overlay_Get_Pixel(layer, 1, 1, &origin_R, &origin_G, &origin_B);
550 
                    Cube_Overlay_Move_Pixel(layer, 1, 2, layer, 1, 1);
551 
                    Cube_Overlay_Move_Pixel(layer, 1, 3, layer, 1, 2);
552 
                    Cube_Overlay_Move_Pixel(layer, 1, 4, layer, 1, 3);
553 
                    Cube_Overlay_Move_Pixel(layer, 1, 5, layer, 1, 4);
554 
                    Cube_Overlay_Move_Pixel(layer, 1, 6, layer, 1, 5);
555 
                    Cube_Overlay_Move_Pixel(layer, 2, 6, layer, 1, 6);
556 
                    Cube_Overlay_Move_Pixel(layer, 3, 6, layer, 2, 6);
557 
                    Cube_Overlay_Move_Pixel(layer, 4, 6, layer, 3, 6);
558 
                    Cube_Overlay_Move_Pixel(layer, 5, 6, layer, 4, 6);
559 
                    Cube_Overlay_Move_Pixel(layer, 6, 6, layer, 5, 6);
560 
                    Cube_Overlay_Move_Pixel(layer, 6, 5, layer, 6, 6);
561 
                    Cube_Overlay_Move_Pixel(layer, 6, 4, layer, 6, 5);
562 
                    Cube_Overlay_Move_Pixel(layer, 6, 3, layer, 6, 4);
563 
                    Cube_Overlay_Move_Pixel(layer, 6, 2, layer, 6, 3);
564 
                    Cube_Overlay_Move_Pixel(layer, 6, 1, layer, 6, 2);
565 
                    Cube_Overlay_Move_Pixel(layer, 5, 1, layer, 6, 1);
566 
                    Cube_Overlay_Move_Pixel(layer, 4, 1, layer, 5, 1);
567 
                    Cube_Overlay_Move_Pixel(layer, 3, 1, layer, 4, 1);
568 
                    Cube_Overlay_Move_Pixel(layer, 2, 1, layer, 3, 1);
569 
                    Cube_Overlay_Set_Pixel(layer, 2, 1, origin_R, origin_G, origin_B);
570 
                    break;
571 
                case 2:
572 
                    // Rotate second to innermost layer
573 
                    Cube_Overlay_Get_Pixel(layer, 2, 2, &origin_R, &origin_G, &origin_B);
574 
                    Cube_Overlay_Move_Pixel(layer, 2, 3, layer, 2, 2);
575 
                    Cube_Overlay_Move_Pixel(layer, 2, 4, layer, 2, 3);
576 
                    Cube_Overlay_Move_Pixel(layer, 2, 5, layer, 2, 4);
577 
                    Cube_Overlay_Move_Pixel(layer, 3, 5, layer, 2, 5);
578 
                    Cube_Overlay_Move_Pixel(layer, 4, 5, layer, 3, 5);
579 
                    Cube_Overlay_Move_Pixel(layer, 5, 5, layer, 4, 5);
580 
                    Cube_Overlay_Move_Pixel(layer, 5, 4, layer, 5, 5);
581 
                    Cube_Overlay_Move_Pixel(layer, 5, 3, layer, 5, 4);
582 
                    Cube_Overlay_Move_Pixel(layer, 5, 2, layer, 5, 3);
583 
                    Cube_Overlay_Move_Pixel(layer, 4, 2, layer, 5, 2);
584 
                    Cube_Overlay_Move_Pixel(layer, 3, 2, layer, 4, 2);
585 
                    Cube_Overlay_Set_Pixel(layer, 3, 2, origin_R, origin_G, origin_B);
586 
                    break;
587 
                case 3:
588 
                    // Rotate innermost layer
589 
                    Cube_Overlay_Get_Pixel(layer, 3, 3, &origin_R, &origin_G, &origin_B);
590 
                    Cube_Overlay_Move_Pixel(layer, 3, 4, layer, 3, 3);
591 
                    Cube_Overlay_Move_Pixel(layer, 4, 4, layer, 3, 4);
592 
                    Cube_Overlay_Move_Pixel(layer, 4, 3, layer, 4, 4);
593 
                    Cube_Overlay_Set_Pixel(layer, 4, 3, origin_R, origin_G, origin_B);
594 
                    break;
595 
            }
596 
        } else {
597 
            switch(shell) {
598 
                case 0:
599 
                    // Rotate outermost layer
600 
                    Cube_Overlay_Get_Pixel(layer, 0, 0, &origin_R, &origin_G, &origin_B);
601 
                    Cube_Overlay_Move_Pixel(layer, 1, 0, layer, 0, 0);
602 
                    Cube_Overlay_Move_Pixel(layer, 2, 0, layer, 1, 0);
603 
                    Cube_Overlay_Move_Pixel(layer, 3, 0, layer, 2, 0);
604 
                    Cube_Overlay_Move_Pixel(layer, 4, 0, layer, 3, 0);
605 
                    Cube_Overlay_Move_Pixel(layer, 5, 0, layer, 4, 0);
606 
                    Cube_Overlay_Move_Pixel(layer, 6, 0, layer, 5, 0);
607 
                    Cube_Overlay_Move_Pixel(layer, 7, 0, layer, 6, 0);
608 
                    Cube_Overlay_Move_Pixel(layer, 7, 1, layer, 7, 0);
609 
                    Cube_Overlay_Move_Pixel(layer, 7, 2, layer, 7, 1);
610 
                    Cube_Overlay_Move_Pixel(layer, 7, 3, layer, 7, 2);
611 
                    Cube_Overlay_Move_Pixel(layer, 7, 4, layer, 7, 3);
612 
                    Cube_Overlay_Move_Pixel(layer, 7, 5, layer, 7, 4);
613 
                    Cube_Overlay_Move_Pixel(layer, 7, 6, layer, 7, 5);
614 
                    Cube_Overlay_Move_Pixel(layer, 7, 7, layer, 7, 6);
615 
                    Cube_Overlay_Move_Pixel(layer, 6, 7, layer, 7, 7);
616 
                    Cube_Overlay_Move_Pixel(layer, 5, 7, layer, 6, 7);
617 
                    Cube_Overlay_Move_Pixel(layer, 4, 7, layer, 5, 7);
618 
                    Cube_Overlay_Move_Pixel(layer, 3, 7, layer, 4, 7);
619 
                    Cube_Overlay_Move_Pixel(layer, 2, 7, layer, 3, 7);
620 
                    Cube_Overlay_Move_Pixel(layer, 1, 7, layer, 2, 7);
621 
                    Cube_Overlay_Move_Pixel(layer, 0, 7, layer, 1, 7);
622 
                    Cube_Overlay_Move_Pixel(layer, 0, 6, layer, 0, 7);
623 
                    Cube_Overlay_Move_Pixel(layer, 0, 5, layer, 0, 6);
624 
                    Cube_Overlay_Move_Pixel(layer, 0, 4, layer, 0, 5);
625 
                    Cube_Overlay_Move_Pixel(layer, 0, 3, layer, 0, 4);
626 
                    Cube_Overlay_Move_Pixel(layer, 0, 2, layer, 0, 3);
627 
                    Cube_Overlay_Move_Pixel(layer, 0, 1, layer, 0, 2);
628 
                    Cube_Overlay_Set_Pixel(layer, 0, 1, origin_R, origin_G, origin_B);
629 
                    break;
630 
                case 1:
631 
                    // Rotate second to outermost layer
632 
                    Cube_Overlay_Get_Pixel(layer, 1, 1, &origin_R, &origin_G, &origin_B);
633 
                    Cube_Overlay_Move_Pixel(layer, 2, 1, layer, 1, 1);
634 
                    Cube_Overlay_Move_Pixel(layer, 3, 1, layer, 2, 1);
635 
                    Cube_Overlay_Move_Pixel(layer, 4, 1, layer, 3, 1);
636 
                    Cube_Overlay_Move_Pixel(layer, 5, 1, layer, 4, 1);
637 
                    Cube_Overlay_Move_Pixel(layer, 6, 1, layer, 5, 1);
638 
                    Cube_Overlay_Move_Pixel(layer, 6, 2, layer, 6, 1);
639 
                    Cube_Overlay_Move_Pixel(layer, 6, 3, layer, 6, 2);
640 
                    Cube_Overlay_Move_Pixel(layer, 6, 4, layer, 6, 3);
641 
                    Cube_Overlay_Move_Pixel(layer, 6, 5, layer, 6, 4);
642 
                    Cube_Overlay_Move_Pixel(layer, 6, 6, layer, 6, 5);
643 
                    Cube_Overlay_Move_Pixel(layer, 5, 6, layer, 6, 6);
644 
                    Cube_Overlay_Move_Pixel(layer, 4, 6, layer, 5, 6);
645 
                    Cube_Overlay_Move_Pixel(layer, 3, 6, layer, 4, 6);
646 
                    Cube_Overlay_Move_Pixel(layer, 2, 6, layer, 3, 6);
647 
                    Cube_Overlay_Move_Pixel(layer, 1, 6, layer, 2, 6);
648 
                    Cube_Overlay_Move_Pixel(layer, 1, 5, layer, 1, 6);
649 
                    Cube_Overlay_Move_Pixel(layer, 1, 4, layer, 1, 5);
650 
                    Cube_Overlay_Move_Pixel(layer, 1, 3, layer, 1, 4);
651 
                    Cube_Overlay_Move_Pixel(layer, 1, 2, layer, 1, 3);
652 
                    Cube_Overlay_Set_Pixel(layer, 1, 2, origin_R, origin_G, origin_B);
653 
                    break;
654 
                case 2:
655 
                    // Rotate second to innermost layer
656 
                    Cube_Overlay_Get_Pixel(layer, 2, 2, &origin_R, &origin_G, &origin_B);
657 
                    Cube_Overlay_Move_Pixel(layer, 3, 2, layer, 2, 2);
658 
                    Cube_Overlay_Move_Pixel(layer, 4, 2, layer, 3, 2);
659 
                    Cube_Overlay_Move_Pixel(layer, 5, 2, layer, 4, 2);
660 
                    Cube_Overlay_Move_Pixel(layer, 5, 3, layer, 5, 2);
661 
                    Cube_Overlay_Move_Pixel(layer, 5, 4, layer, 5, 3);
662 
                    Cube_Overlay_Move_Pixel(layer, 5, 5, layer, 5, 4);
663 
                    Cube_Overlay_Move_Pixel(layer, 4, 5, layer, 5, 5);
664 
                    Cube_Overlay_Move_Pixel(layer, 3, 5, layer, 4, 5);
665 
                    Cube_Overlay_Move_Pixel(layer, 2, 5, layer, 3, 5);
666 
                    Cube_Overlay_Move_Pixel(layer, 2, 4, layer, 2, 5);
667 
                    Cube_Overlay_Move_Pixel(layer, 2, 3, layer, 2, 4);
668 
                    Cube_Overlay_Set_Pixel(layer, 2, 3, origin_R, origin_G, origin_B);
669 
                    break;
670 
                case 3:
671 
                    // Rotate innermost layer
672 
                    Cube_Overlay_Get_Pixel(layer, 3, 3, &origin_R, &origin_G, &origin_B);
673 
                    Cube_Overlay_Move_Pixel(layer, 4, 3, layer, 3, 3);
674 
                    Cube_Overlay_Move_Pixel(layer, 4, 4, layer, 4, 3);
675 
                    Cube_Overlay_Move_Pixel(layer, 3, 4, layer, 4, 4);
676 
                    Cube_Overlay_Set_Pixel(layer, 3, 4, origin_R, origin_G, origin_B);
677 
                    break;
678 
            }
679 
        }
680 
    }
681 
}
682 
 
212 Kevin 683 
////////////////////////////
684 
// Text control functions //
685 
////////////////////////////
206 Kevin 686 
 
231 Kevin 687 
void Cube_Text_Init(uint8_t *string, uint8_t length, uint16_t R, uint16_t G, uint16_t B) {
206 Kevin 688 
    // Ensure that the length of the string does not exceed the storage buffer
689 
    if (length > CUBE_STRING_MAX_LENGTH) length = CUBE_STRING_MAX_LENGTH;
690 
 
215 Kevin 691 
    Cube_Overlay_Clear();
692 
 
206 Kevin 693 
    // Copy the passed data into the buffer
231 Kevin 694 
    uint8_t i;
206 Kevin 695 
    for (i = 0; i < length; i++)
696 
        cube_data_ptr->string[i] = string[i];
697 
    cube_data_ptr->string_length = length;
698 
    cube_data_ptr->string_index = 0;
699 
    cube_data_ptr->string_line = 0;
700 
    cube_data_ptr->string_R = R;
701 
    cube_data_ptr->string_G = G;
702 
    cube_data_ptr->string_B = B;
703 
}
704 
 
705 
void Cube_Text_Interrupt(void) {
231 Kevin 706 
    uint8_t layer;
707 
    uint16_t line;
206 Kevin 708 
 
709 
    // Rotate before drawing the new line at (0,0)
710 
    Cube_Overlay_Rotate_Shell(0, 0);
711 
 
231 Kevin 712 
    // Get the next vertical line of the int8_tacter currently being drawn
206 Kevin 713 
    if (cube_data_ptr->string_line == 5) {
231 Kevin 714 
        line = 0x0; // Leave a space between int8_tacters
206 Kevin 715 
    } else {
716 
        line = font[(cube_data_ptr->string[cube_data_ptr->string_index] * 5)
717 
                + cube_data_ptr->string_line];
718 
    }
719 
 
720 
    // Draw the line onto (0,0) using the specified color
231 Kevin 721 
    for (layer = 8; layer != 0; layer--) {
206 Kevin 722 
        if (line & 0x1) {
231 Kevin 723 
            Cube_Overlay_Set_Pixel(layer-1, 0, 0, cube_data_ptr->string_R,
206 Kevin 724 
                    cube_data_ptr->string_G, cube_data_ptr->string_B);
725 
        } else {
231 Kevin 726 
            Cube_Overlay_Set_Pixel(layer-1, 0, 0, 0x00, 0x00, 0x00);
206 Kevin 727 
        }
728 
        line >>= 1;
729 
    }
730 
 
231 Kevin 731 
    // Increment the vertical line and the int8_tacter as needed
206 Kevin 732 
    if (cube_data_ptr->string_line == 5) {
733 
        cube_data_ptr->string_line = 0;
734 
        if (cube_data_ptr->string_index == cube_data_ptr->string_length-1) {
735 
            cube_data_ptr->string_index = 0;
736 
        } else {
737 
            cube_data_ptr->string_index += 1;
738 
        }
739 
    } else {
740 
        cube_data_ptr->string_line += 1;
741 
    }
212 Kevin 742 
}
743 
 
744 
/////////////////////////////////////////////
745 
// Functions for processing streaming data //
746 
/////////////////////////////////////////////
747 
 
231 Kevin 748 
void Cube_Data_In(uint8_t c) {
749 
    // Reset upon receiving the start int8_t
212 Kevin 750 
    if (c == CUBE_START_CHAR) {
751 
        cube_data_ptr->frame_length = 0;
752 
        cube_data_ptr->frame_index = 0;
753 
        cube_data_ptr->frame_checksum = 0;
754 
        cube_data_ptr->frame_command = 0;
215 Kevin 755 
        cube_data_ptr->frame_escape = 0;
212 Kevin 756 
        cube_data_ptr->frame_state = READ_LENGTH_MSB;
215 Kevin 757 
        return;
758 
    }
231 Kevin 759 
    // If the input is the escape int8_t, XOR the next int8_t received
215 Kevin 760 
    if (c == CUBE_ESCAPE_CHAR) {
761 
        cube_data_ptr->frame_escape = 1;
762 
        return;
763 
    }
231 Kevin 764 
    // XOR the input int8_t if needed
215 Kevin 765 
    if (cube_data_ptr->frame_escape) {
766 
        c ^= CUBE_ESCAPE_XOR;
767 
        cube_data_ptr->frame_escape = 0;
768 
    }
769 
    // Process data
770 
    switch (cube_data_ptr->frame_state) {
771 
        case IDLE:
231 Kevin 772 
            // Reflect the int8_tacter back to the transmitter
215 Kevin 773 
            UART1_Write(&c, 1);
774 
            break;
775 
        case READ_LENGTH_MSB: // Save MSB of length
776 
            cube_data_ptr->frame_length |= (c << 8);
777 
            cube_data_ptr->frame_state = READ_LENGTH_LSB;
778 
            break;
779 
        case READ_LENGTH_LSB: // Save LSB of length
780 
            cube_data_ptr->frame_length |= c;
781 
            cube_data_ptr->frame_state = READ_COMMAND;
782 
            break;
783 
        case READ_COMMAND: // Store the command byte
784 
            cube_data_ptr->frame_checksum += c;
785 
            cube_data_ptr->frame_command = c;
786 
            if (cube_data_ptr->frame_length == 1)
787 
                cube_data_ptr->frame_state = READ_CHECKSUM;
788 
            else
212 Kevin 789 
                cube_data_ptr->frame_state = READ_DATA;
215 Kevin 790 
            break;
791 
        case READ_DATA: // Read the passed data into the buffer
792 
            cube_data_ptr->frame_checksum += c;
793 
            cube_data_ptr->frame_buffer[cube_data_ptr->frame_index] = c;
794 
            cube_data_ptr->frame_index++;
795 
            if (cube_data_ptr->frame_index == cube_data_ptr->frame_length - 1)
796 
                cube_data_ptr->frame_state = READ_CHECKSUM;
797 
            break;
798 
        case READ_CHECKSUM: // Process frame if checksum is valid
799 
            cube_data_ptr->frame_checksum = 0xFF - cube_data_ptr->frame_checksum;
800 
            if (cube_data_ptr->frame_checksum == c) {
801 
                Cube_Data_In_Process_Frame();
802 
            }
803 
            cube_data_ptr->frame_state = IDLE;
804 
            cube_data_ptr->frame_index = 0;
805 
            cube_data_ptr->frame_length = 0;
806 
            break;
807 
        default:
808 
            break;
212 Kevin 809 
    }
810 
}
811 
 
812 
void Cube_Data_In_Process_Frame(void) {
215 Kevin 813 
    // Here we process received frames depending on the command
231 Kevin 814 
    uint8_t *frame = cube_data_ptr->frame_buffer;
212 Kevin 815 
    switch (cube_data_ptr->frame_command) {
215 Kevin 816 
        case CUBE_COMMAND_SET_BC:
817 
            TIMER5_Stop();
818 
            Delay_MS(1); // Need to wait for all SPI writes to complete
819 
            Cube_Write_DCS(frame[0]);
820 
            TIMER5_Start();
821 
            break;
822 
        case CUBE_COMMAND_CLEAR:
823 
            Cube_Clear();
824 
            break;
212 Kevin 825 
        case CUBE_COMMAND_SET_PIXEL:
826 
            Cube_Set_Pixel(frame[0], frame[1], frame[2], frame[3], frame[4], frame[5]);
827 
            break;
216 Kevin 828 
        case CUBE_COMMAND_SET_ALL:
829 
            Cube_Data_Direct_Write_All(&frame[0]);
215 Kevin 830 
            break;
831 
        case CUBE_COMMAND_START_TEXT:
832 
            Cube_Text_Init(&frame[3], cube_data_ptr->frame_length - 4, frame[0], frame[1], frame[2]);
833 
            TIMER4_Start();
834 
            break;
835 
        case CUBE_COMMAND_STOP_TEXT:
836 
            TIMER4_Stop();
837 
            Cube_Overlay_Clear();
838 
            break;
212 Kevin 839 
        default:
840 
            break;
841 
    }
215 Kevin 842 
}
843 
 
231 Kevin 844 
void Cube_Data_Direct_Write_All(uint8_t *buffer) {
216 Kevin 845 
    memcpy(cube_data_ptr->GCS, buffer, CUBE_LAYER_COUNT * GCS_LAYER_SIZE);
199 Kevin 846 
}