1 /* 2 * Copyright (C) 2014 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 24 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 #define BTSTACK_FILE__ "hci_transport_h4.c" 39 40 /* 41 * hci_h4_transport.c 42 * 43 * HCI Transport API implementation for H4 protocol over POSIX with optional support for eHCILL 44 * 45 * Created by Matthias Ringwald on 4/29/09. 46 */ 47 48 #include <inttypes.h> 49 50 #include "btstack_config.h" 51 52 #include "btstack_debug.h" 53 #include "hci.h" 54 #include "hci_transport.h" 55 #include "bluetooth_company_id.h" 56 #include "btstack_uart_block.h" 57 58 #define ENABLE_LOG_EHCILL 59 60 #ifdef ENABLE_EHCILL 61 62 // eHCILL commands 63 enum EHCILL_MESSAGES { 64 EHCILL_GO_TO_SLEEP_IND = 0x030, 65 EHCILL_GO_TO_SLEEP_ACK = 0x031, 66 EHCILL_WAKE_UP_IND = 0x032, 67 EHCILL_WAKE_UP_ACK = 0x033, 68 EHCILL_WAKEUP_SIGNAL = 0x034, 69 }; 70 71 static int hci_transport_h4_ehcill_outgoing_packet_ready(void); 72 static void hci_transport_h4_echill_send_wakeup_ind(void); 73 static void hci_transport_h4_ehcill_handle_command(uint8_t action); 74 static void hci_transport_h4_ehcill_handle_ehcill_command_sent(void); 75 static void hci_transport_h4_ehcill_handle_packet_sent(void); 76 static void hci_transport_h4_ehcill_open(void); 77 static void hci_transport_h4_ehcill_reset_statemachine(void); 78 static void hci_transport_h4_ehcill_send_ehcill_command(void); 79 static void hci_transport_h4_ehcill_sleep_ack_timer_setup(void); 80 static void hci_transport_h4_ehcill_trigger_wakeup(void); 81 82 typedef enum { 83 EHCILL_STATE_W2_SEND_SLEEP_ACK, 84 EHCILL_STATE_SLEEP, 85 EHCILL_STATE_W4_WAKEUP_IND_OR_ACK, 86 EHCILL_STATE_AWAKE 87 } EHCILL_STATE; 88 89 // eHCILL state machine 90 static EHCILL_STATE ehcill_state; 91 static uint8_t ehcill_command_to_send; 92 93 static btstack_uart_sleep_mode_t btstack_uart_sleep_mode; 94 95 // work around for eHCILL problem 96 static btstack_timer_source_t ehcill_sleep_ack_timer; 97 98 #endif 99 100 101 // assert pre-buffer for packet type is available 102 #if !defined(HCI_OUTGOING_PRE_BUFFER_SIZE) || (HCI_OUTGOING_PRE_BUFFER_SIZE == 0) 103 #error HCI_OUTGOING_PRE_BUFFER_SIZE not defined. Please update hci.h 104 #endif 105 106 static void dummy_handler(uint8_t packet_type, uint8_t *packet, uint16_t size); 107 108 typedef enum { 109 H4_W4_PACKET_TYPE, 110 H4_W4_EVENT_HEADER, 111 H4_W4_ACL_HEADER, 112 H4_W4_SCO_HEADER, 113 H4_W4_PAYLOAD, 114 } H4_STATE; 115 116 typedef enum { 117 TX_IDLE = 1, 118 TX_W4_PACKET_SENT, 119 #ifdef ENABLE_EHCILL 120 TX_W4_WAKEUP, 121 TX_W2_EHCILL_SEND, 122 TX_W4_EHCILL_SENT, 123 #endif 124 } TX_STATE; 125 126 // UART Driver + Config 127 static const btstack_uart_block_t * btstack_uart; 128 static btstack_uart_config_t uart_config; 129 130 // write state 131 static TX_STATE tx_state; 132 #ifdef ENABLE_EHCILL 133 static uint8_t * ehcill_tx_data; 134 static uint16_t ehcill_tx_len; // 0 == no outgoing packet 135 #endif 136 137 static uint8_t packet_sent_event[] = { HCI_EVENT_TRANSPORT_PACKET_SENT, 0}; 138 139 static void (*packet_handler)(uint8_t packet_type, uint8_t *packet, uint16_t size) = dummy_handler; 140 141 // packet reader state machine 142 static H4_STATE h4_state; 143 static uint16_t bytes_to_read; 144 static uint16_t read_pos; 145 146 // incoming packet buffer 147 static uint8_t hci_packet_with_pre_buffer[HCI_INCOMING_PRE_BUFFER_SIZE + HCI_INCOMING_PACKET_BUFFER_SIZE + 1]; // packet type + max(acl header + acl payload, event header + event data) 148 static uint8_t * hci_packet = &hci_packet_with_pre_buffer[HCI_INCOMING_PRE_BUFFER_SIZE]; 149 150 // Baudrate change bugs in TI CC256x and CYW20704 151 #ifdef ENABLE_CC256X_BAUDRATE_CHANGE_FLOWCONTROL_BUG_WORKAROUND 152 #define ENABLE_BAUDRATE_CHANGE_FLOWCONTROL_BUG_WORKAROUND 153 static const uint8_t baud_rate_command_prefix[] = { 0x01, 0x36, 0xff, 0x04}; 154 #endif 155 156 #ifdef ENABLE_CYPRESS_BAUDRATE_CHANGE_FLOWCONTROL_BUG_WORKAROUND 157 #ifdef ENABLE_BAUDRATE_CHANGE_FLOWCONTROL_BUG_WORKAROUND 158 #error "Please enable either ENABLE_CC256X_BAUDRATE_CHANGE_FLOWCONTROL_BUG_WORKAROUND or ENABLE_BAUDRATE_CHANGE_FLOWCONTROL_BUG_WORKAROUND" 159 #endif 160 #define ENABLE_BAUDRATE_CHANGE_FLOWCONTROL_BUG_WORKAROUND 161 static const uint8_t baud_rate_command_prefix[] = { 0x01, 0x18, 0xfc, 0x06}; 162 #endif 163 164 #ifdef ENABLE_BAUDRATE_CHANGE_FLOWCONTROL_BUG_WORKAROUND 165 static const uint8_t local_version_event_prefix[] = { 0x04, 0x0e, 0x0c, 0x01, 0x01, 0x10}; 166 static enum { 167 BAUDRATE_CHANGE_WORKAROUND_IDLE, 168 BAUDRATE_CHANGE_WORKAROUND_CHIPSET_DETECTED, 169 BAUDRATE_CHANGE_WORKAROUND_BAUDRATE_COMMAND_SENT, 170 BAUDRATE_CHANGE_WORKAROUND_DONE 171 } baudrate_change_workaround_state; 172 #endif 173 174 static int hci_transport_h4_set_baudrate(uint32_t baudrate){ 175 log_info("hci_transport_h4_set_baudrate %"PRIu32, baudrate); 176 return btstack_uart->set_baudrate(baudrate); 177 } 178 179 static void hci_transport_h4_reset_statemachine(void){ 180 h4_state = H4_W4_PACKET_TYPE; 181 read_pos = 0; 182 bytes_to_read = 1; 183 } 184 185 static void hci_transport_h4_trigger_next_read(void){ 186 // log_info("hci_transport_h4_trigger_next_read: %u bytes", bytes_to_read); 187 btstack_uart->receive_block(&hci_packet[read_pos], bytes_to_read); 188 } 189 190 static void hci_transport_h4_block_read(void){ 191 192 read_pos += bytes_to_read; 193 194 switch (h4_state) { 195 case H4_W4_PACKET_TYPE: 196 switch (hci_packet[0]){ 197 case HCI_EVENT_PACKET: 198 bytes_to_read = HCI_EVENT_HEADER_SIZE; 199 h4_state = H4_W4_EVENT_HEADER; 200 break; 201 case HCI_ACL_DATA_PACKET: 202 bytes_to_read = HCI_ACL_HEADER_SIZE; 203 h4_state = H4_W4_ACL_HEADER; 204 break; 205 case HCI_SCO_DATA_PACKET: 206 bytes_to_read = HCI_SCO_HEADER_SIZE; 207 h4_state = H4_W4_SCO_HEADER; 208 break; 209 #ifdef ENABLE_EHCILL 210 case EHCILL_GO_TO_SLEEP_IND: 211 case EHCILL_GO_TO_SLEEP_ACK: 212 case EHCILL_WAKE_UP_IND: 213 case EHCILL_WAKE_UP_ACK: 214 hci_transport_h4_ehcill_handle_command(hci_packet[0]); 215 hci_transport_h4_reset_statemachine(); 216 break; 217 #endif 218 default: 219 log_error("hci_transport_h4: invalid packet type 0x%02x", hci_packet[0]); 220 hci_transport_h4_reset_statemachine(); 221 break; 222 } 223 break; 224 225 case H4_W4_EVENT_HEADER: 226 bytes_to_read = hci_packet[2]; 227 // check Event length 228 if (bytes_to_read > (HCI_INCOMING_PACKET_BUFFER_SIZE - HCI_EVENT_HEADER_SIZE)){ 229 log_error("hci_transport_h4: invalid Event len %d - only space for %u", bytes_to_read, HCI_INCOMING_PACKET_BUFFER_SIZE - HCI_EVENT_HEADER_SIZE); 230 hci_transport_h4_reset_statemachine(); 231 break; 232 } 233 h4_state = H4_W4_PAYLOAD; 234 break; 235 236 case H4_W4_ACL_HEADER: 237 bytes_to_read = little_endian_read_16( hci_packet, 3); 238 // check ACL length 239 if (bytes_to_read > (HCI_INCOMING_PACKET_BUFFER_SIZE - HCI_ACL_HEADER_SIZE)){ 240 log_error("hci_transport_h4: invalid ACL payload len %d - only space for %u", bytes_to_read, HCI_INCOMING_PACKET_BUFFER_SIZE - HCI_ACL_HEADER_SIZE); 241 hci_transport_h4_reset_statemachine(); 242 break; 243 } 244 h4_state = H4_W4_PAYLOAD; 245 break; 246 247 case H4_W4_SCO_HEADER: 248 bytes_to_read = hci_packet[3]; 249 // check SCO length 250 if (bytes_to_read > (HCI_INCOMING_PACKET_BUFFER_SIZE - HCI_SCO_HEADER_SIZE)){ 251 log_error("hci_transport_h4: invalid SCO payload len %d - only space for %u", bytes_to_read, HCI_INCOMING_PACKET_BUFFER_SIZE - HCI_SCO_HEADER_SIZE); 252 hci_transport_h4_reset_statemachine(); 253 break; 254 } 255 h4_state = H4_W4_PAYLOAD; 256 break; 257 258 case H4_W4_PAYLOAD: 259 #ifdef ENABLE_BAUDRATE_CHANGE_FLOWCONTROL_BUG_WORKAROUND 260 if (baudrate_change_workaround_state == BAUDRATE_CHANGE_WORKAROUND_IDLE 261 && memcmp(hci_packet, local_version_event_prefix, sizeof(local_version_event_prefix)) == 0){ 262 #ifdef ENABLE_CC256X_BAUDRATE_CHANGE_FLOWCONTROL_BUG_WORKAROUND 263 if (little_endian_read_16(hci_packet, 11) == BLUETOOTH_COMPANY_ID_TEXAS_INSTRUMENTS_INC){ 264 // detect TI CC256x controller based on manufacturer 265 log_info("Detected CC256x controller"); 266 baudrate_change_workaround_state = BAUDRATE_CHANGE_WORKAROUND_CHIPSET_DETECTED; 267 } else { 268 // work around not needed 269 log_info("Bluetooth controller not by TI"); 270 baudrate_change_workaround_state = BAUDRATE_CHANGE_WORKAROUND_DONE; 271 } 272 #endif 273 #ifdef ENABLE_CYPRESS_BAUDRATE_CHANGE_FLOWCONTROL_BUG_WORKAROUND 274 if (little_endian_read_16(hci_packet, 11) == BLUETOOTH_COMPANY_ID_CYPRESS_SEMICONDUCTOR){ 275 // detect Cypress controller based on manufacturer 276 log_info("Detected Cypress controller"); 277 baudrate_change_workaround_state = BAUDRATE_CHANGE_WORKAROUND_CHIPSET_DETECTED; 278 } else { 279 // work around not needed 280 log_info("Bluetooth controller not by Cypress"); 281 baudrate_change_workaround_state = BAUDRATE_CHANGE_WORKAROUND_DONE; 282 } 283 #endif 284 } 285 #endif 286 packet_handler(hci_packet[0], &hci_packet[1], read_pos-1); 287 hci_transport_h4_reset_statemachine(); 288 break; 289 default: 290 break; 291 } 292 293 #ifdef ENABLE_BAUDRATE_CHANGE_FLOWCONTROL_BUG_WORKAROUND 294 if (baudrate_change_workaround_state == BAUDRATE_CHANGE_WORKAROUND_BAUDRATE_COMMAND_SENT){ 295 baudrate_change_workaround_state = BAUDRATE_CHANGE_WORKAROUND_IDLE; 296 // avoid flowcontrol problem by reading expected hci command complete event of 7 bytes in a single block read 297 h4_state = H4_W4_PAYLOAD; 298 bytes_to_read = 7; 299 } 300 #endif 301 302 hci_transport_h4_trigger_next_read(); 303 } 304 305 static void hci_transport_h4_block_sent(void){ 306 switch (tx_state){ 307 case TX_W4_PACKET_SENT: 308 // packet fully sent, reset state 309 #ifdef ENABLE_EHCILL 310 ehcill_tx_len = 0; 311 #endif 312 tx_state = TX_IDLE; 313 314 #ifdef ENABLE_EHCILL 315 // notify eHCILL engine 316 hci_transport_h4_ehcill_handle_packet_sent(); 317 #endif 318 // notify upper stack that it can send again 319 packet_handler(HCI_EVENT_PACKET, &packet_sent_event[0], sizeof(packet_sent_event)); 320 break; 321 322 #ifdef ENABLE_EHCILL 323 case TX_W4_EHCILL_SENT: 324 case TX_W4_WAKEUP: 325 hci_transport_h4_ehcill_handle_ehcill_command_sent(); 326 break; 327 #endif 328 329 default: 330 break; 331 } 332 } 333 334 static int hci_transport_h4_can_send_now(uint8_t packet_type){ 335 return tx_state == TX_IDLE; 336 } 337 338 static int hci_transport_h4_send_packet(uint8_t packet_type, uint8_t * packet, int size){ 339 340 // store packet type before actual data and increase size 341 size++; 342 packet--; 343 *packet = packet_type; 344 345 #ifdef ENABLE_BAUDRATE_CHANGE_FLOWCONTROL_BUG_WORKAROUND 346 if ((baudrate_change_workaround_state == BAUDRATE_CHANGE_WORKAROUND_CHIPSET_DETECTED) 347 && (memcmp(packet, baud_rate_command_prefix, sizeof(baud_rate_command_prefix)) == 0)) { 348 log_info("Baud rate command detected, expect command complete event next"); 349 baudrate_change_workaround_state = BAUDRATE_CHANGE_WORKAROUND_BAUDRATE_COMMAND_SENT; 350 } 351 #endif 352 353 #ifdef ENABLE_EHCILL 354 // store request for later 355 ehcill_tx_len = size; 356 ehcill_tx_data = packet; 357 switch (ehcill_state){ 358 case EHCILL_STATE_SLEEP: 359 hci_transport_h4_ehcill_trigger_wakeup(); 360 return 0; 361 case EHCILL_STATE_W2_SEND_SLEEP_ACK: 362 log_info("eHILL: send next packet, state EHCILL_STATE_W2_SEND_SLEEP_ACK"); 363 return 0; 364 default: 365 break; 366 } 367 #endif 368 369 // start sending 370 tx_state = TX_W4_PACKET_SENT; 371 btstack_uart->send_block(packet, size); 372 return 0; 373 } 374 375 static void hci_transport_h4_init(const void * transport_config){ 376 // check for hci_transport_config_uart_t 377 if (!transport_config) { 378 log_error("hci_transport_h4: no config!"); 379 return; 380 } 381 if (((hci_transport_config_t*)transport_config)->type != HCI_TRANSPORT_CONFIG_UART) { 382 log_error("hci_transport_h4: config not of type != HCI_TRANSPORT_CONFIG_UART!"); 383 return; 384 } 385 386 // extract UART config from transport config 387 hci_transport_config_uart_t * hci_transport_config_uart = (hci_transport_config_uart_t*) transport_config; 388 uart_config.baudrate = hci_transport_config_uart->baudrate_init; 389 uart_config.flowcontrol = hci_transport_config_uart->flowcontrol; 390 uart_config.device_name = hci_transport_config_uart->device_name; 391 392 // setup UART driver 393 btstack_uart->init(&uart_config); 394 btstack_uart->set_block_received(&hci_transport_h4_block_read); 395 btstack_uart->set_block_sent(&hci_transport_h4_block_sent); 396 } 397 398 static int hci_transport_h4_open(void){ 399 int res = btstack_uart->open(); 400 if (res){ 401 return res; 402 } 403 hci_transport_h4_reset_statemachine(); 404 hci_transport_h4_trigger_next_read(); 405 406 tx_state = TX_IDLE; 407 408 #ifdef ENABLE_EHCILL 409 hci_transport_h4_ehcill_open(); 410 #endif 411 return 0; 412 } 413 414 static int hci_transport_h4_close(void){ 415 return btstack_uart->close(); 416 } 417 418 static void hci_transport_h4_register_packet_handler(void (*handler)(uint8_t packet_type, uint8_t *packet, uint16_t size)){ 419 packet_handler = handler; 420 } 421 422 static void dummy_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 423 } 424 425 // 426 // --- main part of eHCILL implementation --- 427 // 428 429 #ifdef ENABLE_EHCILL 430 431 static void hci_transport_h4_ehcill_emit_sleep_state(int sleep_active){ 432 static int last_state = 0; 433 if (sleep_active == last_state) return; 434 last_state = sleep_active; 435 436 log_info("hci_transport_h4_ehcill_emit_sleep_state: %u", sleep_active); 437 uint8_t event[3]; 438 event[0] = HCI_EVENT_TRANSPORT_SLEEP_MODE; 439 event[1] = sizeof(event) - 2; 440 event[2] = sleep_active; 441 packet_handler(HCI_EVENT_PACKET, &event[0], sizeof(event)); 442 } 443 444 static void hci_transport_h4_ehcill_wakeup_handler(void){ 445 #ifdef ENABLE_LOG_EHCILL 446 log_info("eHCILL: UART wakeup received"); 447 #endif 448 hci_transport_h4_ehcill_handle_command(EHCILL_WAKEUP_SIGNAL); 449 } 450 451 static void hci_transport_h4_ehcill_open(void){ 452 hci_transport_h4_ehcill_reset_statemachine(); 453 454 // find best sleep mode to use: wake on CTS, wake on RX, none 455 btstack_uart_sleep_mode = BTSTACK_UART_SLEEP_OFF; 456 int supported_sleep_modes = 0; 457 if (btstack_uart->get_supported_sleep_modes){ 458 supported_sleep_modes = btstack_uart->get_supported_sleep_modes(); 459 } 460 if (supported_sleep_modes & BTSTACK_UART_SLEEP_MASK_RTS_HIGH_WAKE_ON_CTS_PULSE){ 461 log_info("eHCILL: using wake on CTS"); 462 btstack_uart_sleep_mode = BTSTACK_UART_SLEEP_RTS_HIGH_WAKE_ON_CTS_PULSE; 463 } else if (supported_sleep_modes & BTSTACK_UART_SLEEP_MASK_RTS_LOW_WAKE_ON_RX_EDGE){ 464 log_info("eHCILL: using wake on RX"); 465 btstack_uart_sleep_mode = BTSTACK_UART_SLEEP_RTS_LOW_WAKE_ON_RX_EDGE; 466 } else { 467 log_info("eHCILL: UART driver does not provide compatible sleep mode"); 468 } 469 if (btstack_uart->set_wakeup_handler){ 470 btstack_uart->set_wakeup_handler(&hci_transport_h4_ehcill_wakeup_handler); 471 } 472 } 473 474 static void hci_transport_h4_echill_send_wakeup_ind(void){ 475 #ifdef ENABLE_LOG_EHCILL 476 log_info("eHCILL: send WAKEUP_IND"); 477 #endif 478 // update state 479 tx_state = TX_W4_WAKEUP; 480 ehcill_state = EHCILL_STATE_W4_WAKEUP_IND_OR_ACK; 481 ehcill_command_to_send = EHCILL_WAKE_UP_IND; 482 btstack_uart->send_block(&ehcill_command_to_send, 1); 483 } 484 485 static int hci_transport_h4_ehcill_outgoing_packet_ready(void){ 486 return ehcill_tx_len != 0; 487 } 488 489 static void hci_transport_h4_ehcill_reset_statemachine(void){ 490 ehcill_state = EHCILL_STATE_AWAKE; 491 } 492 493 static void hci_transport_h4_ehcill_send_ehcill_command(void){ 494 #ifdef ENABLE_LOG_EHCILL 495 log_info("eHCILL: send command %02x", ehcill_command_to_send); 496 #endif 497 tx_state = TX_W4_EHCILL_SENT; 498 if (ehcill_command_to_send == EHCILL_GO_TO_SLEEP_ACK){ 499 ehcill_state = EHCILL_STATE_SLEEP; 500 } 501 btstack_uart->send_block(&ehcill_command_to_send, 1); 502 } 503 504 static void hci_transport_h4_ehcill_sleep_ack_timer_handler(btstack_timer_source_t * timer){ 505 UNUSED(timer); 506 #ifdef ENABLE_LOG_EHCILL 507 log_info("eHCILL: timer triggered"); 508 #endif 509 hci_transport_h4_ehcill_send_ehcill_command(); 510 } 511 512 static void hci_transport_h4_ehcill_sleep_ack_timer_setup(void){ 513 // setup timer 514 #ifdef ENABLE_LOG_EHCILL 515 log_info("eHCILL: set timer for sending command %02x", ehcill_command_to_send); 516 #endif 517 btstack_run_loop_set_timer_handler(&ehcill_sleep_ack_timer, &hci_transport_h4_ehcill_sleep_ack_timer_handler); 518 btstack_run_loop_set_timer(&ehcill_sleep_ack_timer, 50); 519 btstack_run_loop_add_timer(&ehcill_sleep_ack_timer); 520 } 521 522 static void hci_transport_h4_ehcill_trigger_wakeup(void){ 523 switch (tx_state){ 524 case TX_W2_EHCILL_SEND: 525 case TX_W4_EHCILL_SENT: 526 // wake up / sleep ack in progress, nothing to do now 527 return; 528 case TX_IDLE: 529 default: 530 // all clear, prepare for wakeup 531 break; 532 } 533 // UART needed again 534 hci_transport_h4_ehcill_emit_sleep_state(0); 535 if (btstack_uart_sleep_mode){ 536 btstack_uart->set_sleep(BTSTACK_UART_SLEEP_OFF); 537 } 538 hci_transport_h4_echill_send_wakeup_ind(); 539 } 540 541 static void hci_transport_h4_ehcill_schedule_ehcill_command(uint8_t command){ 542 #ifdef ENABLE_LOG_EHCILL 543 log_info("eHCILL: schedule eHCILL command %02x", command); 544 #endif 545 ehcill_command_to_send = command; 546 switch (tx_state){ 547 case TX_IDLE: 548 if (ehcill_command_to_send == EHCILL_WAKE_UP_ACK){ 549 // send right away 550 hci_transport_h4_ehcill_send_ehcill_command(); 551 } else { 552 // change state so BTstack cannot send and setup timer 553 tx_state = TX_W2_EHCILL_SEND; 554 hci_transport_h4_ehcill_sleep_ack_timer_setup(); 555 } 556 break; 557 default: 558 break; 559 } 560 } 561 562 static void hci_transport_h4_ehcill_handle_command(uint8_t action){ 563 // log_info("hci_transport_h4_ehcill_handle: %x, state %u, defer_rx %u", action, ehcill_state, ehcill_defer_rx_size); 564 switch(ehcill_state){ 565 case EHCILL_STATE_AWAKE: 566 switch(action){ 567 case EHCILL_GO_TO_SLEEP_IND: 568 ehcill_state = EHCILL_STATE_W2_SEND_SLEEP_ACK; 569 #ifdef ENABLE_LOG_EHCILL 570 log_info("eHCILL: Received GO_TO_SLEEP_IND RX"); 571 #endif 572 hci_transport_h4_ehcill_schedule_ehcill_command(EHCILL_GO_TO_SLEEP_ACK); 573 break; 574 default: 575 break; 576 } 577 break; 578 579 case EHCILL_STATE_W2_SEND_SLEEP_ACK: 580 switch(action){ 581 case EHCILL_WAKE_UP_IND: 582 ehcill_state = EHCILL_STATE_AWAKE; 583 hci_transport_h4_ehcill_emit_sleep_state(0); 584 if (btstack_uart_sleep_mode){ 585 btstack_uart->set_sleep(BTSTACK_UART_SLEEP_OFF); 586 } 587 #ifdef ENABLE_LOG_EHCILL 588 log_info("eHCILL: Received WAKE_UP_IND RX"); 589 #endif 590 hci_transport_h4_ehcill_schedule_ehcill_command(EHCILL_WAKE_UP_ACK); 591 break; 592 593 default: 594 break; 595 } 596 break; 597 598 case EHCILL_STATE_SLEEP: 599 switch(action){ 600 case EHCILL_WAKEUP_SIGNAL: 601 hci_transport_h4_ehcill_emit_sleep_state(0); 602 if (btstack_uart_sleep_mode){ 603 btstack_uart->set_sleep(BTSTACK_UART_SLEEP_OFF); 604 } 605 break; 606 case EHCILL_WAKE_UP_IND: 607 ehcill_state = EHCILL_STATE_AWAKE; 608 hci_transport_h4_ehcill_emit_sleep_state(0); 609 if (btstack_uart_sleep_mode){ 610 btstack_uart->set_sleep(BTSTACK_UART_SLEEP_OFF); 611 } 612 #ifdef ENABLE_LOG_EHCILL 613 log_info("eHCILL: Received WAKE_UP_IND RX"); 614 #endif 615 hci_transport_h4_ehcill_schedule_ehcill_command(EHCILL_WAKE_UP_ACK); 616 break; 617 618 default: 619 break; 620 } 621 break; 622 623 case EHCILL_STATE_W4_WAKEUP_IND_OR_ACK: 624 switch(action){ 625 case EHCILL_WAKE_UP_IND: 626 case EHCILL_WAKE_UP_ACK: 627 #ifdef ENABLE_LOG_EHCILL 628 log_info("eHCILL: Received WAKE_UP (%02x)", action); 629 #endif 630 tx_state = TX_W4_PACKET_SENT; 631 ehcill_state = EHCILL_STATE_AWAKE; 632 btstack_uart->send_block(ehcill_tx_data, ehcill_tx_len); 633 break; 634 default: 635 break; 636 } 637 break; 638 } 639 } 640 641 static void hci_transport_h4_ehcill_handle_packet_sent(void){ 642 #ifdef ENABLE_LOG_EHCILL 643 log_info("eHCILL: handle packet sent, command to send %02x", ehcill_command_to_send); 644 #endif 645 // now, send pending ehcill command if neccessary 646 switch (ehcill_command_to_send){ 647 case EHCILL_GO_TO_SLEEP_ACK: 648 hci_transport_h4_ehcill_sleep_ack_timer_setup(); 649 break; 650 case EHCILL_WAKE_UP_IND: 651 hci_transport_h4_ehcill_send_ehcill_command(); 652 break; 653 default: 654 break; 655 } 656 } 657 658 static void hci_transport_h4_ehcill_handle_ehcill_command_sent(void){ 659 tx_state = TX_IDLE; 660 int command = ehcill_command_to_send; 661 ehcill_command_to_send = 0; 662 663 #ifdef ENABLE_LOG_EHCILL 664 log_info("eHCILL: handle eHCILL sent, command was %02x", command); 665 #endif 666 667 if (command == EHCILL_GO_TO_SLEEP_ACK) { 668 #ifdef ENABLE_LOG_EHCILL 669 log_info("eHCILL: GO_TO_SLEEP_ACK sent, enter sleep mode"); 670 #endif 671 // UART not needed after EHCILL_GO_TO_SLEEP_ACK was sent 672 if (btstack_uart_sleep_mode != BTSTACK_UART_SLEEP_OFF){ 673 btstack_uart->set_sleep(btstack_uart_sleep_mode); 674 } 675 hci_transport_h4_ehcill_emit_sleep_state(1); 676 } 677 // already packet ready? then start wakeup 678 if (hci_transport_h4_ehcill_outgoing_packet_ready()){ 679 hci_transport_h4_ehcill_emit_sleep_state(0); 680 if (btstack_uart_sleep_mode != BTSTACK_UART_SLEEP_OFF){ 681 btstack_uart->set_sleep(BTSTACK_UART_SLEEP_OFF); 682 } 683 if (command != EHCILL_WAKE_UP_IND){ 684 hci_transport_h4_echill_send_wakeup_ind(); 685 } 686 } 687 } 688 689 #endif 690 // --- end of eHCILL implementation --------- 691 692 static const hci_transport_t hci_transport_h4 = { 693 /* const char * name; */ "H4", 694 /* void (*init) (const void *transport_config); */ &hci_transport_h4_init, 695 /* int (*open)(void); */ &hci_transport_h4_open, 696 /* int (*close)(void); */ &hci_transport_h4_close, 697 /* void (*register_packet_handler)(void (*handler)(...); */ &hci_transport_h4_register_packet_handler, 698 /* int (*can_send_packet_now)(uint8_t packet_type); */ &hci_transport_h4_can_send_now, 699 /* int (*send_packet)(...); */ &hci_transport_h4_send_packet, 700 /* int (*set_baudrate)(uint32_t baudrate); */ &hci_transport_h4_set_baudrate, 701 /* void (*reset_link)(void); */ NULL, 702 /* void (*set_sco_config)(uint16_t voice_setting, int num_connections); */ NULL, 703 }; 704 705 // configure and return h4 singleton 706 const hci_transport_t * hci_transport_h4_instance(const btstack_uart_block_t * uart_driver) { 707 btstack_uart = uart_driver; 708 return &hci_transport_h4; 709 } 710