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__ "hog_keyboard_demo.c" 39 40 // ***************************************************************************** 41 /* EXAMPLE_START(hog_keyboard_demo): HID-over-GATT Keyboard 42 */ 43 // ***************************************************************************** 44 45 #include <stdint.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <inttypes.h> 50 51 #include "hog_keyboard_demo.h" 52 53 #include "btstack.h" 54 55 #include "ble/gatt-service/battery_service_server.h" 56 #include "ble/gatt-service/device_information_service_server.h" 57 #include "ble/gatt-service/hids_device.h" 58 59 // from USB HID Specification 1.1, Appendix B.1 60 const uint8_t hid_descriptor_keyboard_boot_mode[] = { 61 62 0x05, 0x01, // Usage Page (Generic Desktop) 63 0x09, 0x06, // Usage (Keyboard) 64 0xa1, 0x01, // Collection (Application) 65 66 // Modifier byte 67 68 0x75, 0x01, // Report Size (1) 69 0x95, 0x08, // Report Count (8) 70 0x05, 0x07, // Usage Page (Key codes) 71 0x19, 0xe0, // Usage Minimum (Keyboard LeftControl) 72 0x29, 0xe7, // Usage Maxium (Keyboard Right GUI) 73 0x15, 0x00, // Logical Minimum (0) 74 0x25, 0x01, // Logical Maximum (1) 75 0x81, 0x02, // Input (Data, Variable, Absolute) 76 77 // Reserved byte 78 79 0x75, 0x01, // Report Size (1) 80 0x95, 0x08, // Report Count (8) 81 0x81, 0x03, // Input (Constant, Variable, Absolute) 82 83 // LED report + padding 84 85 0x95, 0x05, // Report Count (5) 86 0x75, 0x01, // Report Size (1) 87 0x05, 0x08, // Usage Page (LEDs) 88 0x19, 0x01, // Usage Minimum (Num Lock) 89 0x29, 0x05, // Usage Maxium (Kana) 90 0x91, 0x02, // Output (Data, Variable, Absolute) 91 92 0x95, 0x01, // Report Count (1) 93 0x75, 0x03, // Report Size (3) 94 0x91, 0x03, // Output (Constant, Variable, Absolute) 95 96 // Keycodes 97 98 0x95, 0x06, // Report Count (6) 99 0x75, 0x08, // Report Size (8) 100 0x15, 0x00, // Logical Minimum (0) 101 0x25, 0xff, // Logical Maximum (1) 102 0x05, 0x07, // Usage Page (Key codes) 103 0x19, 0x00, // Usage Minimum (Reserved (no event indicated)) 104 0x29, 0xff, // Usage Maxium (Reserved) 105 0x81, 0x00, // Input (Data, Array) 106 107 0xc0, // End collection 108 }; 109 110 111 112 // 113 #define CHAR_ILLEGAL 0xff 114 #define CHAR_RETURN '\n' 115 #define CHAR_ESCAPE 27 116 #define CHAR_TAB '\t' 117 #define CHAR_BACKSPACE 0x7f 118 119 // Simplified US Keyboard with Shift modifier 120 121 /** 122 * English (US) 123 */ 124 static const uint8_t keytable_us_none [] = { 125 CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, /* 0-3 */ 126 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', /* 4-13 */ 127 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', /* 14-23 */ 128 'u', 'v', 'w', 'x', 'y', 'z', /* 24-29 */ 129 '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', /* 30-39 */ 130 CHAR_RETURN, CHAR_ESCAPE, CHAR_BACKSPACE, CHAR_TAB, ' ', /* 40-44 */ 131 '-', '=', '[', ']', '\\', CHAR_ILLEGAL, ';', '\'', 0x60, ',', /* 45-54 */ 132 '.', '/', CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, /* 55-60 */ 133 CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, /* 61-64 */ 134 CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, /* 65-68 */ 135 CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, /* 69-72 */ 136 CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, /* 73-76 */ 137 CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, /* 77-80 */ 138 CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, /* 81-84 */ 139 '*', '-', '+', '\n', '1', '2', '3', '4', '5', /* 85-97 */ 140 '6', '7', '8', '9', '0', '.', 0xa7, /* 97-100 */ 141 }; 142 143 static const uint8_t keytable_us_shift[] = { 144 CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, /* 0-3 */ 145 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', /* 4-13 */ 146 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', /* 14-23 */ 147 'U', 'V', 'W', 'X', 'Y', 'Z', /* 24-29 */ 148 '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', /* 30-39 */ 149 CHAR_RETURN, CHAR_ESCAPE, CHAR_BACKSPACE, CHAR_TAB, ' ', /* 40-44 */ 150 '_', '+', '{', '}', '|', CHAR_ILLEGAL, ':', '"', 0x7E, '<', /* 45-54 */ 151 '>', '?', CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, /* 55-60 */ 152 CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, /* 61-64 */ 153 CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, /* 65-68 */ 154 CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, /* 69-72 */ 155 CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, /* 73-76 */ 156 CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, /* 77-80 */ 157 CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, /* 81-84 */ 158 '*', '-', '+', '\n', '1', '2', '3', '4', '5', /* 85-97 */ 159 '6', '7', '8', '9', '0', '.', 0xb1, /* 97-100 */ 160 }; 161 162 // static btstack_timer_source_t heartbeat; 163 static btstack_packet_callback_registration_t hci_event_callback_registration; 164 static btstack_packet_callback_registration_t sm_event_callback_registration; 165 static uint8_t battery = 100; 166 static hci_con_handle_t con_handle = HCI_CON_HANDLE_INVALID; 167 168 static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 169 170 const uint8_t adv_data[] = { 171 // Flags general discoverable, BR/EDR not supported 172 0x02, BLUETOOTH_DATA_TYPE_FLAGS, 0x06, 173 // Name 174 0x0d, BLUETOOTH_DATA_TYPE_COMPLETE_LOCAL_NAME, 'H', 'I', 'D', ' ', 'K', 'e', 'y', 'b', 'o', 'a', 'r', 'd', 175 // 16-bit Service UUIDs 176 0x03, BLUETOOTH_DATA_TYPE_COMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS, ORG_BLUETOOTH_SERVICE_HUMAN_INTERFACE_DEVICE & 0xff, ORG_BLUETOOTH_SERVICE_HUMAN_INTERFACE_DEVICE >> 8, 177 }; 178 const uint8_t adv_data_len = sizeof(adv_data); 179 180 static void le_keyboard_setup(void){ 181 182 // register for HCI events 183 hci_event_callback_registration.callback = &packet_handler; 184 hci_add_event_handler(&hci_event_callback_registration); 185 186 l2cap_init(); 187 188 // setup le device db 189 le_device_db_init(); 190 191 // setup SM: Display only 192 sm_init(); 193 sm_event_callback_registration.callback = &packet_handler; 194 sm_add_event_handler(&sm_event_callback_registration); 195 sm_set_io_capabilities(IO_CAPABILITY_DISPLAY_ONLY); 196 sm_set_authentication_requirements(SM_AUTHREQ_SECURE_CONNECTION | SM_AUTHREQ_BONDING); 197 198 // setup ATT server 199 att_server_init(profile_data, NULL, NULL); 200 201 // setup battery service 202 battery_service_server_init(battery); 203 204 // setup device information service 205 device_information_service_server_init(); 206 207 // setup HID Device service 208 hids_device_init(0, hid_descriptor_keyboard_boot_mode, sizeof(hid_descriptor_keyboard_boot_mode)); 209 hids_device_register_packet_handler(packet_handler); 210 211 // setup advertisements 212 uint16_t adv_int_min = 0x0030; 213 uint16_t adv_int_max = 0x0030; 214 uint8_t adv_type = 0; 215 bd_addr_t null_addr; 216 memset(null_addr, 0, 6); 217 gap_advertisements_set_params(adv_int_min, adv_int_max, adv_type, 0, null_addr, 0x07, 0x00); 218 gap_advertisements_set_data(adv_data_len, (uint8_t*) adv_data); 219 gap_advertisements_enable(1); 220 } 221 222 // HID Keyboard lookup 223 static int lookup_keycode(uint8_t character, const uint8_t * table, int size, uint8_t * keycode){ 224 int i; 225 for (i=0;i<size;i++){ 226 if (table[i] != character) continue; 227 *keycode = i; 228 return 1; 229 } 230 return 0; 231 } 232 233 static int keycode_and_modifer_us_for_character(uint8_t character, uint8_t * keycode, uint8_t * modifier){ 234 int found; 235 found = lookup_keycode(character, keytable_us_none, sizeof(keytable_us_none), keycode); 236 if (found) { 237 *modifier = 0; // none 238 return 1; 239 } 240 found = lookup_keycode(character, keytable_us_shift, sizeof(keytable_us_shift), keycode); 241 if (found) { 242 *modifier = 2; // shift 243 return 1; 244 } 245 return 0; 246 } 247 248 // HID Report sending 249 250 static void send_report(int modifier, int keycode){ 251 uint8_t report[] = { /* 0xa1, */ modifier, 0, 0, keycode, 0, 0, 0, 0, 0}; 252 hids_device_send_input_report(con_handle, report, sizeof(report)); 253 } 254 255 // Demo Application 256 257 #ifdef HAVE_BTSTACK_STDIN 258 259 // On systems with STDIN, we can directly type on the console 260 static enum { 261 W4_INPUT, 262 W4_CAN_SEND_FROM_BUFFER, 263 W4_CAN_SEND_KEY_UP, 264 } state; 265 266 // Buffer for 20 characters 267 static uint8_t ascii_input_storage[20]; 268 static btstack_ring_buffer_t ascii_input_buffer; 269 270 static void typing_can_send_now(void){ 271 switch (state){ 272 case W4_CAN_SEND_FROM_BUFFER: 273 while (1){ 274 uint8_t c; 275 uint32_t num_bytes_read; 276 277 btstack_ring_buffer_read(&ascii_input_buffer, &c, 1, &num_bytes_read); 278 if (num_bytes_read == 0){ 279 state = W4_INPUT; 280 break; 281 } 282 283 uint8_t modifier; 284 uint8_t keycode; 285 int found = keycode_and_modifer_us_for_character(c, &keycode, &modifier); 286 if (!found) continue; 287 288 printf("sending: %c\n", c); 289 290 send_report(modifier, keycode); 291 state = W4_CAN_SEND_KEY_UP; 292 hids_device_request_can_send_now_event(con_handle); 293 break; 294 } 295 break; 296 case W4_CAN_SEND_KEY_UP: 297 send_report(0, 0); 298 if (btstack_ring_buffer_bytes_available(&ascii_input_buffer)){ 299 state = W4_CAN_SEND_FROM_BUFFER; 300 hids_device_request_can_send_now_event(con_handle); 301 } else { 302 state = W4_INPUT; 303 } 304 break; 305 default: 306 break; 307 } 308 } 309 310 static void stdin_process(char character){ 311 uint8_t c = character; 312 btstack_ring_buffer_write(&ascii_input_buffer, &c, 1); 313 // start sending 314 if (state == W4_INPUT && con_handle != HCI_CON_HANDLE_INVALID){ 315 state = W4_CAN_SEND_FROM_BUFFER; 316 hids_device_request_can_send_now_event(con_handle); 317 } 318 } 319 320 #else 321 322 // On embedded systems, send constant demo text with fixed period 323 324 #define TYPING_PERIOD_MS 50 325 static const char * demo_text = "\n\nHello World!\n\nThis is the BTstack HID Keyboard Demo running on an Embedded Device.\n\n"; 326 327 static int demo_pos; 328 static btstack_timer_source_t typing_timer; 329 330 static int send_keycode; 331 static int send_modifier; 332 static int send_keyup; 333 334 static void send_key(int modifier, int keycode){ 335 send_keycode = keycode; 336 send_modifier = modifier; 337 hids_device_request_can_send_now_event(con_handle); 338 } 339 340 static void typing_can_send_now(void){ 341 send_report(send_modifier, send_keycode); 342 } 343 344 static void typing_timer_handler(btstack_timer_source_t * ts){ 345 346 if (send_keyup){ 347 // just send key up 348 send_keyup = 0; 349 send_key(0, 0); 350 } else { 351 // get next character 352 uint8_t character = demo_text[demo_pos++]; 353 if (demo_text[demo_pos] == 0){ 354 demo_pos = 0; 355 } 356 357 // get keycode and send 358 uint8_t modifier; 359 uint8_t keycode; 360 int found = keycode_and_modifer_us_for_character(character, &keycode, &modifier); 361 if (found){ 362 printf("%c\n", character); 363 send_key(modifier, keycode); 364 send_keyup = 1; 365 } 366 } 367 368 // set next timer 369 btstack_run_loop_set_timer(ts, TYPING_PERIOD_MS); 370 btstack_run_loop_add_timer(ts); 371 } 372 373 static void hid_embedded_start_typing(void){ 374 printf("Start typing..\n"); 375 376 demo_pos = 0; 377 // set one-shot timer 378 typing_timer.process = &typing_timer_handler; 379 btstack_run_loop_set_timer(&typing_timer, TYPING_PERIOD_MS); 380 btstack_run_loop_add_timer(&typing_timer); 381 } 382 383 #endif 384 385 static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 386 UNUSED(channel); 387 UNUSED(size); 388 389 switch (packet_type) { 390 case HCI_EVENT_PACKET: 391 switch (hci_event_packet_get_type(packet)) { 392 case HCI_EVENT_DISCONNECTION_COMPLETE: 393 con_handle = HCI_CON_HANDLE_INVALID; 394 printf("Disconnected\n"); 395 break; 396 case SM_EVENT_JUST_WORKS_REQUEST: 397 printf("Just Works requested\n"); 398 sm_just_works_confirm(sm_event_just_works_request_get_handle(packet)); 399 break; 400 case SM_EVENT_NUMERIC_COMPARISON_REQUEST: 401 printf("Confirming numeric comparison: %"PRIu32"\n", sm_event_numeric_comparison_request_get_passkey(packet)); 402 sm_numeric_comparison_confirm(sm_event_passkey_display_number_get_handle(packet)); 403 break; 404 case SM_EVENT_PASSKEY_DISPLAY_NUMBER: 405 printf("Display Passkey: %"PRIu32"\n", sm_event_passkey_display_number_get_passkey(packet)); 406 break; 407 case HCI_EVENT_HIDS_META: 408 switch (hci_event_hids_meta_get_subevent_code(packet)){ 409 case HIDS_SUBEVENT_INPUT_REPORT_ENABLE: 410 con_handle = hids_subevent_input_report_enable_get_con_handle(packet); 411 printf("Report Characteristic Subscribed %u\n", hids_subevent_input_report_enable_get_enable(packet)); 412 #ifndef HAVE_BTSTACK_STDIN 413 hid_embedded_start_typing(); 414 #endif 415 break; 416 case HIDS_SUBEVENT_BOOT_KEYBOARD_INPUT_REPORT_ENABLE: 417 con_handle = hids_subevent_input_report_enable_get_con_handle(packet); 418 printf("Boot Keyboard Characteristic Subscribed %u\n", hids_subevent_boot_keyboard_input_report_enable_get_enable(packet)); 419 break; 420 case HIDS_SUBEVENT_PROTOCOL_MODE: 421 printf("Protocol Mode: %s mode\n", hids_subevent_protocol_mode_get_protocol_mode(packet) ? "Report" : "Boot"); 422 break; 423 case HIDS_SUBEVENT_CAN_SEND_NOW: 424 typing_can_send_now(); 425 break; 426 default: 427 break; 428 } 429 } 430 break; 431 } 432 } 433 434 int btstack_main(void); 435 int btstack_main(void) 436 { 437 le_keyboard_setup(); 438 439 #ifdef HAVE_BTSTACK_STDIN 440 btstack_ring_buffer_init(&ascii_input_buffer, ascii_input_storage, sizeof(ascii_input_storage)); 441 btstack_stdin_setup(stdin_process); 442 #endif 443 444 // turn on! 445 hci_power_control(HCI_POWER_ON); 446 447 return 0; 448 } 449 /* EXAMPLE_END */ 450