| 1 | #include <stdint.h> |
| 2 | #include <stdio.h> |
| 3 | #include <string.h> |
| 4 | #include "teensy3/core_pins.h" |
| 5 | #include "teensy3/usb_seremu.h" |
| 6 | #include "teensy3/usb_rawhid.h" |
| 7 | #include "pkts.h" |
| 8 | |
| 9 | // use power of 2 |
| 10 | #define STREAM_BUF_SIZE 512 |
| 11 | #define STREAM_BUF_MASK (512 - 1) |
| 12 | |
| 13 | /* ?0SA 00DU, ?1CB RLDU */ |
| 14 | static struct { |
| 15 | uint8_t stream[STREAM_BUF_SIZE][2]; |
| 16 | uint8_t fixed_state[4]; |
| 17 | uint32_t stream_enable:1; |
| 18 | uint32_t stream_started:1; |
| 19 | uint32_t stream_received:1; |
| 20 | uint32_t use_readinc:1; |
| 21 | uint32_t frame_cnt; |
| 22 | uint32_t edge_cnt; |
| 23 | uint32_t i; |
| 24 | uint32_t o; |
| 25 | } g; |
| 26 | |
| 27 | #define STREAM_EL_SZ sizeof(g.stream[0]) |
| 28 | |
| 29 | ssize_t _write(int fd, const void *buf, size_t nbyte) |
| 30 | { |
| 31 | char tbuf[64]; |
| 32 | int ret; |
| 33 | |
| 34 | if (fd != 1 && fd != 2) { |
| 35 | snprintf(tbuf, sizeof(tbuf), "write to fd %d\n", fd); |
| 36 | usb_seremu_write(tbuf, strlen(tbuf)); |
| 37 | } |
| 38 | |
| 39 | ret = usb_seremu_write(buf, nbyte); |
| 40 | return ret < 0 ? ret : nbyte; |
| 41 | } |
| 42 | |
| 43 | void yield(void) |
| 44 | { |
| 45 | } |
| 46 | |
| 47 | static void portb_isr_fixed(void) |
| 48 | { |
| 49 | uint32_t isfr, th; |
| 50 | |
| 51 | isfr = PORTB_ISFR; |
| 52 | PORTB_ISFR = isfr; |
| 53 | th = (GPIOB_PDIR >> CORE_PIN0_BIT) & 1; |
| 54 | |
| 55 | GPIOD_PDOR = g.fixed_state[th]; |
| 56 | g.edge_cnt++; |
| 57 | } |
| 58 | |
| 59 | static void portb_isr_readinc(void) |
| 60 | { |
| 61 | uint32_t isfr, th; |
| 62 | |
| 63 | isfr = PORTB_ISFR; |
| 64 | PORTB_ISFR = isfr; |
| 65 | th = (GPIOB_PDIR >> CORE_PIN0_BIT) & 1; |
| 66 | |
| 67 | GPIOD_PDOR = g.stream[g.o][th]; |
| 68 | if (th) { |
| 69 | g.o = (g.o + 1) & STREAM_BUF_MASK; |
| 70 | if (g.o == g.i) |
| 71 | // done |
| 72 | attachInterruptVector(IRQ_PORTB, portb_isr_fixed); |
| 73 | g.frame_cnt++; |
| 74 | } |
| 75 | g.edge_cnt++; |
| 76 | } |
| 77 | |
| 78 | static void portb_isr_read(void) |
| 79 | { |
| 80 | uint32_t isfr, th; |
| 81 | |
| 82 | isfr = PORTB_ISFR; |
| 83 | PORTB_ISFR = isfr; |
| 84 | th = (GPIOB_PDIR >> CORE_PIN0_BIT) & 1; |
| 85 | |
| 86 | GPIOD_PDOR = g.stream[g.o][th]; |
| 87 | g.edge_cnt++; |
| 88 | } |
| 89 | |
| 90 | static void portc_isr_nop(void) |
| 91 | { |
| 92 | uint32_t isfr; |
| 93 | |
| 94 | isfr = PORTC_ISFR; |
| 95 | PORTC_ISFR = isfr; |
| 96 | } |
| 97 | |
| 98 | // /vsync starts at line 235/259 (ntsc/pal), just as vcounter jumps back |
| 99 | // we care when it comes out (/vsync goes high) after 3 lines at 238/262 |
| 100 | static void portc_isr_frameinc(void) |
| 101 | { |
| 102 | uint32_t isfr; |
| 103 | |
| 104 | isfr = PORTC_ISFR; |
| 105 | PORTC_ISFR = isfr; |
| 106 | |
| 107 | g.o = (g.o + 1) & STREAM_BUF_MASK; |
| 108 | if (g.o == g.i) { |
| 109 | attachInterruptVector(IRQ_PORTB, portb_isr_fixed); |
| 110 | attachInterruptVector(IRQ_PORTC, portc_isr_nop); |
| 111 | } |
| 112 | g.frame_cnt++; |
| 113 | } |
| 114 | |
| 115 | static void udelay(uint32_t us) |
| 116 | { |
| 117 | uint32_t start = micros(); |
| 118 | |
| 119 | while ((micros() - start) < us) { |
| 120 | asm volatile("nop; nop; nop; nop"); |
| 121 | yield(); |
| 122 | } |
| 123 | } |
| 124 | |
| 125 | static void do_start_seq(void) |
| 126 | { |
| 127 | uint32_t edge_cnt_last; |
| 128 | uint32_t edge_cnt; |
| 129 | uint32_t start, t1, t2; |
| 130 | int tout; |
| 131 | |
| 132 | start = micros(); |
| 133 | edge_cnt = g.edge_cnt; |
| 134 | |
| 135 | /* magic value */ |
| 136 | g.fixed_state[0] = |
| 137 | g.fixed_state[1] = 0x25; |
| 138 | |
| 139 | for (tout = 10000; tout > 0; tout--) { |
| 140 | edge_cnt_last = edge_cnt; |
| 141 | udelay(100); |
| 142 | edge_cnt = g.edge_cnt; |
| 143 | |
| 144 | if (edge_cnt != edge_cnt_last) |
| 145 | continue; |
| 146 | if (!(GPIOB_PDIR & CORE_PIN0_BITMASK)) |
| 147 | break; |
| 148 | } |
| 149 | |
| 150 | g.fixed_state[0] = 0x33; |
| 151 | g.fixed_state[1] = 0x3f; |
| 152 | GPIOD_PDOR = 0x33; |
| 153 | |
| 154 | t1 = micros(); |
| 155 | if (tout == 0) { |
| 156 | printf("start_seq timeout1, t=%u\n", t1 - start); |
| 157 | return; |
| 158 | } |
| 159 | |
| 160 | for (tout = 100000; tout > 0; tout--) { |
| 161 | udelay(1); |
| 162 | |
| 163 | if (GPIOB_PDIR & CORE_PIN0_BITMASK) |
| 164 | break; |
| 165 | } |
| 166 | |
| 167 | t2 = micros(); |
| 168 | if (tout == 0) { |
| 169 | printf("start_seq timeout2, t1=%u, t2=%u\n", |
| 170 | t1 - start, t2 - t1); |
| 171 | return; |
| 172 | } |
| 173 | |
| 174 | //printf(" t1=%u, t2=%u\n", t1 - start, t2 - t1); |
| 175 | |
| 176 | if (g.stream_started) { |
| 177 | printf("got start_seq when already started\n"); |
| 178 | return; |
| 179 | } |
| 180 | |
| 181 | if (!g.stream_enable) { |
| 182 | printf("got start_seq, without enable from USB\n"); |
| 183 | return; |
| 184 | } |
| 185 | |
| 186 | if (g.i == g.o) { |
| 187 | printf("got start_seq while buffer is empty\n"); |
| 188 | return; |
| 189 | } |
| 190 | |
| 191 | __disable_irq(); |
| 192 | g.stream_started = 1; |
| 193 | if (g.use_readinc) { |
| 194 | attachInterruptVector(IRQ_PORTB, portb_isr_readinc); |
| 195 | attachInterruptVector(IRQ_PORTC, portc_isr_nop); |
| 196 | } |
| 197 | else { |
| 198 | attachInterruptVector(IRQ_PORTB, portb_isr_read); |
| 199 | attachInterruptVector(IRQ_PORTC, portc_isr_frameinc); |
| 200 | } |
| 201 | __enable_irq(); |
| 202 | } |
| 203 | |
| 204 | static int get_space(void) |
| 205 | { |
| 206 | return STREAM_BUF_SIZE - ((g.i - g.o) & STREAM_BUF_MASK); |
| 207 | } |
| 208 | |
| 209 | static void do_usb(void *buf) |
| 210 | { |
| 211 | struct tas_pkt *pkt = buf; |
| 212 | uint32_t i, g_i; |
| 213 | int space; |
| 214 | |
| 215 | switch (pkt->type) { |
| 216 | case PKT_FIXED_STATE: |
| 217 | memcpy(g.fixed_state, pkt->data, sizeof(g.fixed_state)); |
| 218 | break; |
| 219 | case PKT_STREAM_ENABLE: |
| 220 | __disable_irq(); |
| 221 | /* wait for start from MD */ |
| 222 | g.stream_enable = 1; |
| 223 | g.stream_started = 0; |
| 224 | g.stream_received = 0; |
| 225 | g.use_readinc = pkt->start.use_readinc; |
| 226 | g.i = g.o = 0; |
| 227 | g.frame_cnt = 0; |
| 228 | attachInterruptVector(IRQ_PORTB, portb_isr_fixed); |
| 229 | attachInterruptVector(IRQ_PORTC, portc_isr_nop); |
| 230 | __enable_irq(); |
| 231 | break; |
| 232 | case PKT_STREAM_END: |
| 233 | g.stream_received = 1; |
| 234 | printf("end of stream\n"); |
| 235 | break; |
| 236 | case PKT_STREAM_DATA: |
| 237 | g_i = g.i; |
| 238 | space = get_space(); |
| 239 | if (space <= sizeof(pkt->data) / STREAM_EL_SZ) { |
| 240 | printf("got data pkt while space=%d\n", space); |
| 241 | return; |
| 242 | } |
| 243 | for (i = 0; i < sizeof(pkt->data) / STREAM_EL_SZ; i++) { |
| 244 | memcpy(&g.stream[g_i++], |
| 245 | pkt->data + i * STREAM_EL_SZ, |
| 246 | STREAM_EL_SZ); |
| 247 | g_i &= STREAM_BUF_MASK; |
| 248 | } |
| 249 | g.i = g_i; |
| 250 | break; |
| 251 | default: |
| 252 | printf("got unknown pkt type: %04x\n", pkt->type); |
| 253 | break; |
| 254 | } |
| 255 | } |
| 256 | |
| 257 | int main(void) |
| 258 | { |
| 259 | uint32_t edge_cnt_last; |
| 260 | uint32_t edge_cnt; |
| 261 | uint8_t buf[64]; |
| 262 | int timeout; |
| 263 | int ret; |
| 264 | |
| 265 | delay(1000); // wait for usb.. |
| 266 | |
| 267 | /* ?0SA 00DU, ?1CB RLDU */ |
| 268 | g.fixed_state[0] = 0x33; |
| 269 | g.fixed_state[1] = 0x3f; |
| 270 | |
| 271 | printf("starting, rawhid: %d\n", usb_rawhid_available()); |
| 272 | |
| 273 | // md pin th tr tl r l d u vsync |
| 274 | // md bit* 6 5 4 3 2 1 0 |
| 275 | // t bit b16 d5 d4 d3 d2 d1 d0 c6 |
| 276 | // t pin 0 20 6 8 7 14 2 11 |
| 277 | // * - note: tl/tr mixed in most docs |
| 278 | pinMode(0, INPUT); |
| 279 | attachInterrupt(0, portb_isr_fixed, CHANGE); |
| 280 | attachInterruptVector(IRQ_PORTB, portb_isr_fixed); |
| 281 | pinMode(11, INPUT); |
| 282 | attachInterrupt(11, portc_isr_nop, RISING); |
| 283 | attachInterruptVector(IRQ_PORTC, portc_isr_nop); |
| 284 | |
| 285 | NVIC_SET_PRIORITY(IRQ_PORTB, 0); |
| 286 | NVIC_SET_PRIORITY(IRQ_PORTC, 16); |
| 287 | |
| 288 | pinMode( 2, OUTPUT); |
| 289 | pinMode(14, OUTPUT); |
| 290 | pinMode( 7, OUTPUT); |
| 291 | pinMode( 8, OUTPUT); |
| 292 | pinMode( 6, OUTPUT); |
| 293 | pinMode(20, OUTPUT); |
| 294 | |
| 295 | // led |
| 296 | pinMode(13, OUTPUT); |
| 297 | |
| 298 | // CORE_PIN0_PORTSET CORE_PIN0_BITMASK PORTB_PCR16 |
| 299 | printf("GPIOB PDDR, PDIR: %08x %08x\n", GPIOB_PDIR, GPIOB_PDDR); |
| 300 | printf("GPIOC PDDR, PDIR: %08x %08x\n", GPIOC_PDIR, GPIOC_PDDR); |
| 301 | printf("GPIOD PDDR, PDIR: %08x %08x\n", GPIOD_PDIR, GPIOD_PDDR); |
| 302 | printf("PORTB_PCR16: %08x\n", PORTB_PCR16); |
| 303 | printf("PORTC_PCR6: %08x\n", PORTC_PCR6); |
| 304 | |
| 305 | asm("mrs %0, BASEPRI" : "=r"(ret)); |
| 306 | printf("BASEPRI: %d\n", ret); |
| 307 | |
| 308 | timeout = 1000; |
| 309 | edge_cnt_last = g.edge_cnt; |
| 310 | |
| 311 | while (1) { |
| 312 | struct tas_pkt pkt; |
| 313 | while (g.stream_enable && !g.stream_received |
| 314 | && get_space() > sizeof(pkt.data) / STREAM_EL_SZ) |
| 315 | { |
| 316 | pkt.type = PKT_STREAM_REQ; |
| 317 | pkt.req.frame = g.frame_cnt; |
| 318 | |
| 319 | ret = usb_rawhid_send(&pkt, 1000); |
| 320 | if (ret != sizeof(pkt)) { |
| 321 | printf("send STREAM_REQ: %d\n", ret); |
| 322 | break; |
| 323 | } |
| 324 | |
| 325 | ret = usb_rawhid_recv(buf, 1000); |
| 326 | if (ret != 64) |
| 327 | printf("usb_rawhid_recv/s: %d\n", ret); |
| 328 | else |
| 329 | do_usb(buf); |
| 330 | } |
| 331 | |
| 332 | if (timeout == 1000) { |
| 333 | edge_cnt = g.edge_cnt; |
| 334 | //printf("e: %d th: %d\n", edge_cnt - edge_cnt_last, |
| 335 | // (GPIOB_PDIR >> CORE_PIN0_BIT) & 1); |
| 336 | if (edge_cnt - edge_cnt_last > 10000) { |
| 337 | do_start_seq(); |
| 338 | edge_cnt = g.edge_cnt; |
| 339 | } |
| 340 | edge_cnt_last = edge_cnt; |
| 341 | } |
| 342 | |
| 343 | ret = usb_rawhid_recv(buf, timeout); |
| 344 | if (ret == 64) { |
| 345 | CORE_PIN13_PORTSET = CORE_PIN13_BITMASK; |
| 346 | |
| 347 | do_usb(buf); |
| 348 | timeout = 20; |
| 349 | } |
| 350 | else if (ret == 0) { |
| 351 | CORE_PIN13_PORTCLEAR = CORE_PIN13_BITMASK; |
| 352 | timeout = 1000; |
| 353 | } |
| 354 | else { |
| 355 | printf("usb_rawhid_recv: %d\n", ret); |
| 356 | timeout = 1000; |
| 357 | } |
| 358 | } |
| 359 | |
| 360 | return 0; |
| 361 | } |