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_OFF, 110 H4_W4_PACKET_TYPE, 111 H4_W4_EVENT_HEADER, 112 H4_W4_ACL_HEADER, 113 H4_W4_SCO_HEADER, 114 H4_W4_PAYLOAD, 115 } H4_STATE; 116 117 typedef enum { 118 TX_OFF, 119 TX_IDLE, 120 TX_W4_PACKET_SENT, 121 #ifdef ENABLE_EHCILL 122 TX_W4_WAKEUP, 123 TX_W2_EHCILL_SEND, 124 TX_W4_EHCILL_SENT, 125 #endif 126 } TX_STATE; 127 128 // UART Driver + Config 129 static const btstack_uart_block_t * btstack_uart; 130 static btstack_uart_config_t uart_config; 131 132 // write state 133 static TX_STATE tx_state; 134 #ifdef ENABLE_EHCILL 135 static uint8_t * ehcill_tx_data; 136 static uint16_t ehcill_tx_len; // 0 == no outgoing packet 137 #endif 138 139 static uint8_t packet_sent_event[] = { HCI_EVENT_TRANSPORT_PACKET_SENT, 0}; 140 141 static void (*packet_handler)(uint8_t packet_type, uint8_t *packet, uint16_t size) = dummy_handler; 142 143 // packet reader state machine 144 static H4_STATE h4_state; 145 static uint16_t bytes_to_read; 146 static uint16_t read_pos; 147 148 // incoming packet buffer 149 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) 150 static uint8_t * hci_packet = &hci_packet_with_pre_buffer[HCI_INCOMING_PRE_BUFFER_SIZE]; 151 152 // Baudrate change bugs in TI CC256x and CYW20704 153 #ifdef ENABLE_CC256X_BAUDRATE_CHANGE_FLOWCONTROL_BUG_WORKAROUND 154 #define ENABLE_BAUDRATE_CHANGE_FLOWCONTROL_BUG_WORKAROUND 155 static const uint8_t baud_rate_command_prefix[] = { 0x01, 0x36, 0xff, 0x04}; 156 #endif 157 158 #ifdef ENABLE_CYPRESS_BAUDRATE_CHANGE_FLOWCONTROL_BUG_WORKAROUND 159 #ifdef ENABLE_BAUDRATE_CHANGE_FLOWCONTROL_BUG_WORKAROUND 160 #error "Please enable either ENABLE_CC256X_BAUDRATE_CHANGE_FLOWCONTROL_BUG_WORKAROUND or ENABLE_BAUDRATE_CHANGE_FLOWCONTROL_BUG_WORKAROUND" 161 #endif 162 #define ENABLE_BAUDRATE_CHANGE_FLOWCONTROL_BUG_WORKAROUND 163 static const uint8_t baud_rate_command_prefix[] = { 0x01, 0x18, 0xfc, 0x06}; 164 #endif 165 166 #ifdef ENABLE_BAUDRATE_CHANGE_FLOWCONTROL_BUG_WORKAROUND 167 static const uint8_t local_version_event_prefix[] = { 0x04, 0x0e, 0x0c, 0x01, 0x01, 0x10}; 168 static enum { 169 BAUDRATE_CHANGE_WORKAROUND_IDLE, 170 BAUDRATE_CHANGE_WORKAROUND_CHIPSET_DETECTED, 171 BAUDRATE_CHANGE_WORKAROUND_BAUDRATE_COMMAND_SENT, 172 BAUDRATE_CHANGE_WORKAROUND_DONE 173 } baudrate_change_workaround_state; 174 #endif 175 176 static int hci_transport_h4_set_baudrate(uint32_t baudrate){ 177 log_info("hci_transport_h4_set_baudrate %"PRIu32, baudrate); 178 return btstack_uart->set_baudrate(baudrate); 179 } 180 181 static void hci_transport_h4_reset_statemachine(void){ 182 h4_state = H4_W4_PACKET_TYPE; 183 read_pos = 0; 184 bytes_to_read = 1; 185 } 186 187 static void hci_transport_h4_trigger_next_read(void){ 188 // log_info("hci_transport_h4_trigger_next_read: %u bytes", bytes_to_read); 189 btstack_uart->receive_block(&hci_packet[read_pos], bytes_to_read); 190 } 191 192 static void hci_transport_h4_block_read(void){ 193 194 read_pos += bytes_to_read; 195 196 switch (h4_state) { 197 case H4_W4_PACKET_TYPE: 198 switch (hci_packet[0]){ 199 case HCI_EVENT_PACKET: 200 bytes_to_read = HCI_EVENT_HEADER_SIZE; 201 h4_state = H4_W4_EVENT_HEADER; 202 break; 203 case HCI_ACL_DATA_PACKET: 204 bytes_to_read = HCI_ACL_HEADER_SIZE; 205 h4_state = H4_W4_ACL_HEADER; 206 break; 207 case HCI_SCO_DATA_PACKET: 208 bytes_to_read = HCI_SCO_HEADER_SIZE; 209 h4_state = H4_W4_SCO_HEADER; 210 break; 211 #ifdef ENABLE_EHCILL 212 case EHCILL_GO_TO_SLEEP_IND: 213 case EHCILL_GO_TO_SLEEP_ACK: 214 case EHCILL_WAKE_UP_IND: 215 case EHCILL_WAKE_UP_ACK: 216 hci_transport_h4_ehcill_handle_command(hci_packet[0]); 217 hci_transport_h4_reset_statemachine(); 218 break; 219 #endif 220 default: 221 log_error("hci_transport_h4: invalid packet type 0x%02x", hci_packet[0]); 222 hci_transport_h4_reset_statemachine(); 223 break; 224 } 225 break; 226 227 case H4_W4_EVENT_HEADER: 228 bytes_to_read = hci_packet[2]; 229 // check Event length 230 if (bytes_to_read > (HCI_INCOMING_PACKET_BUFFER_SIZE - HCI_EVENT_HEADER_SIZE)){ 231 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); 232 hci_transport_h4_reset_statemachine(); 233 break; 234 } 235 h4_state = H4_W4_PAYLOAD; 236 break; 237 238 case H4_W4_ACL_HEADER: 239 bytes_to_read = little_endian_read_16( hci_packet, 3); 240 // check ACL length 241 if (bytes_to_read > (HCI_INCOMING_PACKET_BUFFER_SIZE - HCI_ACL_HEADER_SIZE)){ 242 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); 243 hci_transport_h4_reset_statemachine(); 244 break; 245 } 246 h4_state = H4_W4_PAYLOAD; 247 break; 248 249 case H4_W4_SCO_HEADER: 250 bytes_to_read = hci_packet[3]; 251 // check SCO length 252 if (bytes_to_read > (HCI_INCOMING_PACKET_BUFFER_SIZE - HCI_SCO_HEADER_SIZE)){ 253 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); 254 hci_transport_h4_reset_statemachine(); 255 break; 256 } 257 h4_state = H4_W4_PAYLOAD; 258 break; 259 260 case H4_W4_PAYLOAD: 261 #ifdef ENABLE_BAUDRATE_CHANGE_FLOWCONTROL_BUG_WORKAROUND 262 if (baudrate_change_workaround_state == BAUDRATE_CHANGE_WORKAROUND_IDLE 263 && memcmp(hci_packet, local_version_event_prefix, sizeof(local_version_event_prefix)) == 0){ 264 #ifdef ENABLE_CC256X_BAUDRATE_CHANGE_FLOWCONTROL_BUG_WORKAROUND 265 if (little_endian_read_16(hci_packet, 11) == BLUETOOTH_COMPANY_ID_TEXAS_INSTRUMENTS_INC){ 266 // detect TI CC256x controller based on manufacturer 267 log_info("Detected CC256x controller"); 268 baudrate_change_workaround_state = BAUDRATE_CHANGE_WORKAROUND_CHIPSET_DETECTED; 269 } else { 270 // work around not needed 271 log_info("Bluetooth controller not by TI"); 272 baudrate_change_workaround_state = BAUDRATE_CHANGE_WORKAROUND_DONE; 273 } 274 #endif 275 #ifdef ENABLE_CYPRESS_BAUDRATE_CHANGE_FLOWCONTROL_BUG_WORKAROUND 276 if (little_endian_read_16(hci_packet, 11) == BLUETOOTH_COMPANY_ID_CYPRESS_SEMICONDUCTOR){ 277 // detect Cypress controller based on manufacturer 278 log_info("Detected Cypress controller"); 279 baudrate_change_workaround_state = BAUDRATE_CHANGE_WORKAROUND_CHIPSET_DETECTED; 280 } else { 281 // work around not needed 282 log_info("Bluetooth controller not by Cypress"); 283 baudrate_change_workaround_state = BAUDRATE_CHANGE_WORKAROUND_DONE; 284 } 285 #endif 286 } 287 #endif 288 // reset state machine before delivering packet to stack as it might close the transport 289 hci_transport_h4_reset_statemachine(); 290 packet_handler(hci_packet[0], &hci_packet[1], read_pos-1); 291 break; 292 293 case H4_OFF: 294 bytes_to_read = 0; 295 break; 296 } 297 298 #ifdef ENABLE_BAUDRATE_CHANGE_FLOWCONTROL_BUG_WORKAROUND 299 if (baudrate_change_workaround_state == BAUDRATE_CHANGE_WORKAROUND_BAUDRATE_COMMAND_SENT){ 300 baudrate_change_workaround_state = BAUDRATE_CHANGE_WORKAROUND_IDLE; 301 // avoid flowcontrol problem by reading expected hci command complete event of 7 bytes in a single block read 302 h4_state = H4_W4_PAYLOAD; 303 bytes_to_read = 7; 304 } 305 #endif 306 307 if (h4_state != H4_OFF) { 308 hci_transport_h4_trigger_next_read(); 309 } 310 } 311 312 static void hci_transport_h4_block_sent(void){ 313 switch (tx_state){ 314 case TX_W4_PACKET_SENT: 315 // packet fully sent, reset state 316 #ifdef ENABLE_EHCILL 317 ehcill_tx_len = 0; 318 #endif 319 tx_state = TX_IDLE; 320 321 #ifdef ENABLE_EHCILL 322 // notify eHCILL engine 323 hci_transport_h4_ehcill_handle_packet_sent(); 324 #endif 325 // notify upper stack that it can send again 326 packet_handler(HCI_EVENT_PACKET, &packet_sent_event[0], sizeof(packet_sent_event)); 327 break; 328 329 #ifdef ENABLE_EHCILL 330 case TX_W4_EHCILL_SENT: 331 case TX_W4_WAKEUP: 332 hci_transport_h4_ehcill_handle_ehcill_command_sent(); 333 break; 334 #endif 335 336 default: 337 break; 338 } 339 } 340 341 static int hci_transport_h4_can_send_now(uint8_t packet_type){ 342 return tx_state == TX_IDLE; 343 } 344 345 static int hci_transport_h4_send_packet(uint8_t packet_type, uint8_t * packet, int size){ 346 347 // store packet type before actual data and increase size 348 size++; 349 packet--; 350 *packet = packet_type; 351 352 #ifdef ENABLE_BAUDRATE_CHANGE_FLOWCONTROL_BUG_WORKAROUND 353 if ((baudrate_change_workaround_state == BAUDRATE_CHANGE_WORKAROUND_CHIPSET_DETECTED) 354 && (memcmp(packet, baud_rate_command_prefix, sizeof(baud_rate_command_prefix)) == 0)) { 355 log_info("Baud rate command detected, expect command complete event next"); 356 baudrate_change_workaround_state = BAUDRATE_CHANGE_WORKAROUND_BAUDRATE_COMMAND_SENT; 357 } 358 #endif 359 360 #ifdef ENABLE_EHCILL 361 // store request for later 362 ehcill_tx_len = size; 363 ehcill_tx_data = packet; 364 switch (ehcill_state){ 365 case EHCILL_STATE_SLEEP: 366 hci_transport_h4_ehcill_trigger_wakeup(); 367 return 0; 368 case EHCILL_STATE_W2_SEND_SLEEP_ACK: 369 log_info("eHILL: send next packet, state EHCILL_STATE_W2_SEND_SLEEP_ACK"); 370 return 0; 371 default: 372 break; 373 } 374 #endif 375 376 // start sending 377 tx_state = TX_W4_PACKET_SENT; 378 btstack_uart->send_block(packet, size); 379 return 0; 380 } 381 382 static void hci_transport_h4_init(const void * transport_config){ 383 // check for hci_transport_config_uart_t 384 if (!transport_config) { 385 log_error("hci_transport_h4: no config!"); 386 return; 387 } 388 if (((hci_transport_config_t*)transport_config)->type != HCI_TRANSPORT_CONFIG_UART) { 389 log_error("hci_transport_h4: config not of type != HCI_TRANSPORT_CONFIG_UART!"); 390 return; 391 } 392 393 // extract UART config from transport config 394 hci_transport_config_uart_t * hci_transport_config_uart = (hci_transport_config_uart_t*) transport_config; 395 uart_config.baudrate = hci_transport_config_uart->baudrate_init; 396 uart_config.flowcontrol = hci_transport_config_uart->flowcontrol; 397 uart_config.device_name = hci_transport_config_uart->device_name; 398 399 // set state to off 400 tx_state = TX_OFF; 401 h4_state = H4_OFF; 402 403 // setup UART driver 404 btstack_uart->init(&uart_config); 405 btstack_uart->set_block_received(&hci_transport_h4_block_read); 406 btstack_uart->set_block_sent(&hci_transport_h4_block_sent); 407 } 408 409 static int hci_transport_h4_open(void){ 410 // open uart driver 411 int res = btstack_uart->open(); 412 if (res){ 413 return res; 414 } 415 416 // init rx + tx state machines 417 hci_transport_h4_reset_statemachine(); 418 hci_transport_h4_trigger_next_read(); 419 tx_state = TX_IDLE; 420 421 #ifdef ENABLE_EHCILL 422 hci_transport_h4_ehcill_open(); 423 #endif 424 return 0; 425 } 426 427 static int hci_transport_h4_close(void){ 428 // set state to off 429 tx_state = TX_OFF; 430 h4_state = H4_OFF; 431 432 // close uart driver 433 return btstack_uart->close(); 434 } 435 436 static void hci_transport_h4_register_packet_handler(void (*handler)(uint8_t packet_type, uint8_t *packet, uint16_t size)){ 437 packet_handler = handler; 438 } 439 440 static void dummy_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 441 } 442 443 // 444 // --- main part of eHCILL implementation --- 445 // 446 447 #ifdef ENABLE_EHCILL 448 449 static void hci_transport_h4_ehcill_emit_sleep_state(int sleep_active){ 450 static int last_state = 0; 451 if (sleep_active == last_state) return; 452 last_state = sleep_active; 453 454 log_info("hci_transport_h4_ehcill_emit_sleep_state: %u", sleep_active); 455 uint8_t event[3]; 456 event[0] = HCI_EVENT_TRANSPORT_SLEEP_MODE; 457 event[1] = sizeof(event) - 2; 458 event[2] = sleep_active; 459 packet_handler(HCI_EVENT_PACKET, &event[0], sizeof(event)); 460 } 461 462 static void hci_transport_h4_ehcill_wakeup_handler(void){ 463 #ifdef ENABLE_LOG_EHCILL 464 log_info("eHCILL: UART wakeup received"); 465 #endif 466 hci_transport_h4_ehcill_handle_command(EHCILL_WAKEUP_SIGNAL); 467 } 468 469 static void hci_transport_h4_ehcill_open(void){ 470 hci_transport_h4_ehcill_reset_statemachine(); 471 472 // find best sleep mode to use: wake on CTS, wake on RX, none 473 btstack_uart_sleep_mode = BTSTACK_UART_SLEEP_OFF; 474 int supported_sleep_modes = 0; 475 if (btstack_uart->get_supported_sleep_modes){ 476 supported_sleep_modes = btstack_uart->get_supported_sleep_modes(); 477 } 478 if (supported_sleep_modes & BTSTACK_UART_SLEEP_MASK_RTS_HIGH_WAKE_ON_CTS_PULSE){ 479 log_info("eHCILL: using wake on CTS"); 480 btstack_uart_sleep_mode = BTSTACK_UART_SLEEP_RTS_HIGH_WAKE_ON_CTS_PULSE; 481 } else if (supported_sleep_modes & BTSTACK_UART_SLEEP_MASK_RTS_LOW_WAKE_ON_RX_EDGE){ 482 log_info("eHCILL: using wake on RX"); 483 btstack_uart_sleep_mode = BTSTACK_UART_SLEEP_RTS_LOW_WAKE_ON_RX_EDGE; 484 } else { 485 log_info("eHCILL: UART driver does not provide compatible sleep mode"); 486 } 487 if (btstack_uart->set_wakeup_handler){ 488 btstack_uart->set_wakeup_handler(&hci_transport_h4_ehcill_wakeup_handler); 489 } 490 } 491 492 static void hci_transport_h4_echill_send_wakeup_ind(void){ 493 #ifdef ENABLE_LOG_EHCILL 494 log_info("eHCILL: send WAKEUP_IND"); 495 #endif 496 // update state 497 tx_state = TX_W4_WAKEUP; 498 ehcill_state = EHCILL_STATE_W4_WAKEUP_IND_OR_ACK; 499 ehcill_command_to_send = EHCILL_WAKE_UP_IND; 500 btstack_uart->send_block(&ehcill_command_to_send, 1); 501 } 502 503 static int hci_transport_h4_ehcill_outgoing_packet_ready(void){ 504 return ehcill_tx_len != 0; 505 } 506 507 static void hci_transport_h4_ehcill_reset_statemachine(void){ 508 ehcill_state = EHCILL_STATE_AWAKE; 509 } 510 511 static void hci_transport_h4_ehcill_send_ehcill_command(void){ 512 #ifdef ENABLE_LOG_EHCILL 513 log_info("eHCILL: send command %02x", ehcill_command_to_send); 514 #endif 515 tx_state = TX_W4_EHCILL_SENT; 516 if (ehcill_command_to_send == EHCILL_GO_TO_SLEEP_ACK){ 517 ehcill_state = EHCILL_STATE_SLEEP; 518 } 519 btstack_uart->send_block(&ehcill_command_to_send, 1); 520 } 521 522 static void hci_transport_h4_ehcill_sleep_ack_timer_handler(btstack_timer_source_t * timer){ 523 UNUSED(timer); 524 #ifdef ENABLE_LOG_EHCILL 525 log_info("eHCILL: timer triggered"); 526 #endif 527 hci_transport_h4_ehcill_send_ehcill_command(); 528 } 529 530 static void hci_transport_h4_ehcill_sleep_ack_timer_setup(void){ 531 // setup timer 532 #ifdef ENABLE_LOG_EHCILL 533 log_info("eHCILL: set timer for sending command %02x", ehcill_command_to_send); 534 #endif 535 btstack_run_loop_set_timer_handler(&ehcill_sleep_ack_timer, &hci_transport_h4_ehcill_sleep_ack_timer_handler); 536 btstack_run_loop_set_timer(&ehcill_sleep_ack_timer, 50); 537 btstack_run_loop_add_timer(&ehcill_sleep_ack_timer); 538 } 539 540 static void hci_transport_h4_ehcill_trigger_wakeup(void){ 541 switch (tx_state){ 542 case TX_W2_EHCILL_SEND: 543 case TX_W4_EHCILL_SENT: 544 // wake up / sleep ack in progress, nothing to do now 545 return; 546 case TX_IDLE: 547 default: 548 // all clear, prepare for wakeup 549 break; 550 } 551 // UART needed again 552 hci_transport_h4_ehcill_emit_sleep_state(0); 553 if (btstack_uart_sleep_mode){ 554 btstack_uart->set_sleep(BTSTACK_UART_SLEEP_OFF); 555 } 556 hci_transport_h4_echill_send_wakeup_ind(); 557 } 558 559 static void hci_transport_h4_ehcill_schedule_ehcill_command(uint8_t command){ 560 #ifdef ENABLE_LOG_EHCILL 561 log_info("eHCILL: schedule eHCILL command %02x", command); 562 #endif 563 ehcill_command_to_send = command; 564 switch (tx_state){ 565 case TX_IDLE: 566 if (ehcill_command_to_send == EHCILL_WAKE_UP_ACK){ 567 // send right away 568 hci_transport_h4_ehcill_send_ehcill_command(); 569 } else { 570 // change state so BTstack cannot send and setup timer 571 tx_state = TX_W2_EHCILL_SEND; 572 hci_transport_h4_ehcill_sleep_ack_timer_setup(); 573 } 574 break; 575 default: 576 break; 577 } 578 } 579 580 static void hci_transport_h4_ehcill_handle_command(uint8_t action){ 581 // log_info("hci_transport_h4_ehcill_handle: %x, state %u, defer_rx %u", action, ehcill_state, ehcill_defer_rx_size); 582 switch(ehcill_state){ 583 case EHCILL_STATE_AWAKE: 584 switch(action){ 585 case EHCILL_GO_TO_SLEEP_IND: 586 ehcill_state = EHCILL_STATE_W2_SEND_SLEEP_ACK; 587 #ifdef ENABLE_LOG_EHCILL 588 log_info("eHCILL: Received GO_TO_SLEEP_IND RX"); 589 #endif 590 hci_transport_h4_ehcill_schedule_ehcill_command(EHCILL_GO_TO_SLEEP_ACK); 591 break; 592 default: 593 break; 594 } 595 break; 596 597 case EHCILL_STATE_W2_SEND_SLEEP_ACK: 598 switch(action){ 599 case EHCILL_WAKE_UP_IND: 600 ehcill_state = EHCILL_STATE_AWAKE; 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 #ifdef ENABLE_LOG_EHCILL 606 log_info("eHCILL: Received WAKE_UP_IND RX"); 607 #endif 608 hci_transport_h4_ehcill_schedule_ehcill_command(EHCILL_WAKE_UP_ACK); 609 break; 610 611 default: 612 break; 613 } 614 break; 615 616 case EHCILL_STATE_SLEEP: 617 switch(action){ 618 case EHCILL_WAKEUP_SIGNAL: 619 hci_transport_h4_ehcill_emit_sleep_state(0); 620 if (btstack_uart_sleep_mode){ 621 btstack_uart->set_sleep(BTSTACK_UART_SLEEP_OFF); 622 } 623 break; 624 case EHCILL_WAKE_UP_IND: 625 ehcill_state = EHCILL_STATE_AWAKE; 626 hci_transport_h4_ehcill_emit_sleep_state(0); 627 if (btstack_uart_sleep_mode){ 628 btstack_uart->set_sleep(BTSTACK_UART_SLEEP_OFF); 629 } 630 #ifdef ENABLE_LOG_EHCILL 631 log_info("eHCILL: Received WAKE_UP_IND RX"); 632 #endif 633 hci_transport_h4_ehcill_schedule_ehcill_command(EHCILL_WAKE_UP_ACK); 634 break; 635 636 default: 637 break; 638 } 639 break; 640 641 case EHCILL_STATE_W4_WAKEUP_IND_OR_ACK: 642 switch(action){ 643 case EHCILL_WAKE_UP_IND: 644 case EHCILL_WAKE_UP_ACK: 645 #ifdef ENABLE_LOG_EHCILL 646 log_info("eHCILL: Received WAKE_UP (%02x)", action); 647 #endif 648 tx_state = TX_W4_PACKET_SENT; 649 ehcill_state = EHCILL_STATE_AWAKE; 650 btstack_uart->send_block(ehcill_tx_data, ehcill_tx_len); 651 break; 652 default: 653 break; 654 } 655 break; 656 } 657 } 658 659 static void hci_transport_h4_ehcill_handle_packet_sent(void){ 660 #ifdef ENABLE_LOG_EHCILL 661 log_info("eHCILL: handle packet sent, command to send %02x", ehcill_command_to_send); 662 #endif 663 // now, send pending ehcill command if neccessary 664 switch (ehcill_command_to_send){ 665 case EHCILL_GO_TO_SLEEP_ACK: 666 hci_transport_h4_ehcill_sleep_ack_timer_setup(); 667 break; 668 case EHCILL_WAKE_UP_IND: 669 hci_transport_h4_ehcill_send_ehcill_command(); 670 break; 671 default: 672 break; 673 } 674 } 675 676 static void hci_transport_h4_ehcill_handle_ehcill_command_sent(void){ 677 tx_state = TX_IDLE; 678 int command = ehcill_command_to_send; 679 ehcill_command_to_send = 0; 680 681 #ifdef ENABLE_LOG_EHCILL 682 log_info("eHCILL: handle eHCILL sent, command was %02x", command); 683 #endif 684 685 if (command == EHCILL_GO_TO_SLEEP_ACK) { 686 #ifdef ENABLE_LOG_EHCILL 687 log_info("eHCILL: GO_TO_SLEEP_ACK sent, enter sleep mode"); 688 #endif 689 // UART not needed after EHCILL_GO_TO_SLEEP_ACK was sent 690 if (btstack_uart_sleep_mode != BTSTACK_UART_SLEEP_OFF){ 691 btstack_uart->set_sleep(btstack_uart_sleep_mode); 692 } 693 hci_transport_h4_ehcill_emit_sleep_state(1); 694 } 695 // already packet ready? then start wakeup 696 if (hci_transport_h4_ehcill_outgoing_packet_ready()){ 697 hci_transport_h4_ehcill_emit_sleep_state(0); 698 if (btstack_uart_sleep_mode != BTSTACK_UART_SLEEP_OFF){ 699 btstack_uart->set_sleep(BTSTACK_UART_SLEEP_OFF); 700 } 701 if (command != EHCILL_WAKE_UP_IND){ 702 hci_transport_h4_echill_send_wakeup_ind(); 703 } 704 } 705 } 706 707 #endif 708 // --- end of eHCILL implementation --------- 709 710 static const hci_transport_t hci_transport_h4 = { 711 /* const char * name; */ "H4", 712 /* void (*init) (const void *transport_config); */ &hci_transport_h4_init, 713 /* int (*open)(void); */ &hci_transport_h4_open, 714 /* int (*close)(void); */ &hci_transport_h4_close, 715 /* void (*register_packet_handler)(void (*handler)(...); */ &hci_transport_h4_register_packet_handler, 716 /* int (*can_send_packet_now)(uint8_t packet_type); */ &hci_transport_h4_can_send_now, 717 /* int (*send_packet)(...); */ &hci_transport_h4_send_packet, 718 /* int (*set_baudrate)(uint32_t baudrate); */ &hci_transport_h4_set_baudrate, 719 /* void (*reset_link)(void); */ NULL, 720 /* void (*set_sco_config)(uint16_t voice_setting, int num_connections); */ NULL, 721 }; 722 723 // configure and return h4 singleton 724 const hci_transport_t * hci_transport_h4_instance(const btstack_uart_block_t * uart_driver) { 725 btstack_uart = uart_driver; 726 return &hci_transport_h4; 727 } 728