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btstack/example/hog_keyboard_demo.c

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/*
* Copyright (C) 2014 BlueKitchen GmbH
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holders nor the names of
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
* 4. Any redistribution, use, or modification is done solely for
* personal benefit and not for any commercial purpose or for
* monetary gain.
*
* THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS
* RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
* THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Please inquire about commercial licensing options at
* contact@bluekitchen-gmbh.com
*
*/
#define BTSTACK_FILE__ "hog_keyboard_demo.c"
// *****************************************************************************
/* EXAMPLE_START(hog_keyboard_demo): HID-over-GATT Keyboard
*/
// *****************************************************************************
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include "hog_keyboard_demo.h"
#include "btstack.h"
#include "ble/gatt-service/battery_service_server.h"
#include "ble/gatt-service/device_information_service_server.h"
#include "ble/gatt-service/hids_device.h"
// from USB HID Specification 1.1, Appendix B.1
const uint8_t hid_descriptor_keyboard_boot_mode[] = {
0x05, 0x01, // Usage Page (Generic Desktop)
0x09, 0x06, // Usage (Keyboard)
0xa1, 0x01, // Collection (Application)
0x85, 0x01, // Report ID 1
// Modifier byte
0x75, 0x01, // Report Size (1)
0x95, 0x08, // Report Count (8)
0x05, 0x07, // Usage Page (Key codes)
0x19, 0xe0, // Usage Minimum (Keyboard LeftControl)
0x29, 0xe7, // Usage Maxium (Keyboard Right GUI)
0x15, 0x00, // Logical Minimum (0)
0x25, 0x01, // Logical Maximum (1)
0x81, 0x02, // Input (Data, Variable, Absolute)
// Reserved byte
0x75, 0x01, // Report Size (1)
0x95, 0x08, // Report Count (8)
0x81, 0x03, // Input (Constant, Variable, Absolute)
// LED report + padding
0x95, 0x05, // Report Count (5)
0x75, 0x01, // Report Size (1)
0x05, 0x08, // Usage Page (LEDs)
0x19, 0x01, // Usage Minimum (Num Lock)
0x29, 0x05, // Usage Maxium (Kana)
0x91, 0x02, // Output (Data, Variable, Absolute)
0x95, 0x01, // Report Count (1)
0x75, 0x03, // Report Size (3)
0x91, 0x03, // Output (Constant, Variable, Absolute)
// Keycodes
0x95, 0x06, // Report Count (6)
0x75, 0x08, // Report Size (8)
0x15, 0x00, // Logical Minimum (0)
0x25, 0xff, // Logical Maximum (1)
0x05, 0x07, // Usage Page (Key codes)
0x19, 0x00, // Usage Minimum (Reserved (no event indicated))
0x29, 0xff, // Usage Maxium (Reserved)
0x81, 0x00, // Input (Data, Array)
0xc0, // End collection
};
//
#define CHAR_ILLEGAL 0xff
#define CHAR_RETURN '\n'
#define CHAR_ESCAPE 27
#define CHAR_TAB '\t'
#define CHAR_BACKSPACE 0x7f
// Simplified US Keyboard with Shift modifier
/**
* English (US)
*/
static const uint8_t keytable_us_none [] = {
CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, /* 0-3 */
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', /* 4-13 */
'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', /* 14-23 */
'u', 'v', 'w', 'x', 'y', 'z', /* 24-29 */
'1', '2', '3', '4', '5', '6', '7', '8', '9', '0', /* 30-39 */
CHAR_RETURN, CHAR_ESCAPE, CHAR_BACKSPACE, CHAR_TAB, ' ', /* 40-44 */
'-', '=', '[', ']', '\\', CHAR_ILLEGAL, ';', '\'', 0x60, ',', /* 45-54 */
'.', '/', CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, /* 55-60 */
CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, /* 61-64 */
CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, /* 65-68 */
CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, /* 69-72 */
CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, /* 73-76 */
CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, /* 77-80 */
CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, /* 81-84 */
'*', '-', '+', '\n', '1', '2', '3', '4', '5', /* 85-97 */
'6', '7', '8', '9', '0', '.', 0xa7, /* 97-100 */
};
static const uint8_t keytable_us_shift[] = {
CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, /* 0-3 */
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', /* 4-13 */
'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', /* 14-23 */
'U', 'V', 'W', 'X', 'Y', 'Z', /* 24-29 */
'!', '@', '#', '$', '%', '^', '&', '*', '(', ')', /* 30-39 */
CHAR_RETURN, CHAR_ESCAPE, CHAR_BACKSPACE, CHAR_TAB, ' ', /* 40-44 */
'_', '+', '{', '}', '|', CHAR_ILLEGAL, ':', '"', 0x7E, '<', /* 45-54 */
'>', '?', CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, /* 55-60 */
CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, /* 61-64 */
CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, /* 65-68 */
CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, /* 69-72 */
CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, /* 73-76 */
CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, /* 77-80 */
CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, CHAR_ILLEGAL, /* 81-84 */
'*', '-', '+', '\n', '1', '2', '3', '4', '5', /* 85-97 */
'6', '7', '8', '9', '0', '.', 0xb1, /* 97-100 */
};
// static btstack_timer_source_t heartbeat;
static btstack_packet_callback_registration_t hci_event_callback_registration;
static btstack_packet_callback_registration_t sm_event_callback_registration;
static uint8_t battery = 100;
static hci_con_handle_t con_handle = HCI_CON_HANDLE_INVALID;
static uint8_t protocol_mode = 1;
static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size);
const uint8_t adv_data[] = {
// Flags general discoverable, BR/EDR not supported
0x02, BLUETOOTH_DATA_TYPE_FLAGS, 0x06,
// Name
0x0d, BLUETOOTH_DATA_TYPE_COMPLETE_LOCAL_NAME, 'H', 'I', 'D', ' ', 'K', 'e', 'y', 'b', 'o', 'a', 'r', 'd',
// 16-bit Service UUIDs
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,
// Appearance HID - Keyboard (Category 15, Sub-Category 1)
0x03, BLUETOOTH_DATA_TYPE_APPEARANCE, 0xC1, 0x03,
};
const uint8_t adv_data_len = sizeof(adv_data);
static void le_keyboard_setup(void){
l2cap_init();
// setup le device db
le_device_db_init();
// setup SM: Display only
sm_init();
sm_set_io_capabilities(IO_CAPABILITY_DISPLAY_ONLY);
sm_set_authentication_requirements(SM_AUTHREQ_SECURE_CONNECTION | SM_AUTHREQ_BONDING);
// setup ATT server
att_server_init(profile_data, NULL, NULL);
// setup battery service
battery_service_server_init(battery);
// setup device information service
device_information_service_server_init();
// setup HID Device service
hids_device_init(0, hid_descriptor_keyboard_boot_mode, sizeof(hid_descriptor_keyboard_boot_mode));
// setup advertisements
uint16_t adv_int_min = 0x0030;
uint16_t adv_int_max = 0x0030;
uint8_t adv_type = 0;
bd_addr_t null_addr;
memset(null_addr, 0, 6);
gap_advertisements_set_params(adv_int_min, adv_int_max, adv_type, 0, null_addr, 0x07, 0x00);
gap_advertisements_set_data(adv_data_len, (uint8_t*) adv_data);
gap_advertisements_enable(1);
// register for HCI events
hci_event_callback_registration.callback = &packet_handler;
hci_add_event_handler(&hci_event_callback_registration);
// register for SM events
sm_event_callback_registration.callback = &packet_handler;
sm_add_event_handler(&sm_event_callback_registration);
// register for HIDS
hids_device_register_packet_handler(packet_handler);
}
// HID Keyboard lookup
static int lookup_keycode(uint8_t character, const uint8_t * table, int size, uint8_t * keycode){
int i;
for (i=0;i<size;i++){
if (table[i] != character) continue;
*keycode = i;
return 1;
}
return 0;
}
static int keycode_and_modifer_us_for_character(uint8_t character, uint8_t * keycode, uint8_t * modifier){
int found;
found = lookup_keycode(character, keytable_us_none, sizeof(keytable_us_none), keycode);
if (found) {
*modifier = 0; // none
return 1;
}
found = lookup_keycode(character, keytable_us_shift, sizeof(keytable_us_shift), keycode);
if (found) {
*modifier = 2; // shift
return 1;
}
return 0;
}
// HID Report sending
static void send_report(int modifier, int keycode){
uint8_t report[] = { modifier, 0, keycode, 0, 0, 0, 0, 0};
switch (protocol_mode){
case 0:
hids_device_send_boot_keyboard_input_report(con_handle, report, sizeof(report));
break;
case 1:
hids_device_send_input_report(con_handle, report, sizeof(report));
break;
default:
break;
}
}
// Demo Application
#ifdef HAVE_BTSTACK_STDIN
// On systems with STDIN, we can directly type on the console
static enum {
W4_INPUT,
W4_CAN_SEND_FROM_BUFFER,
W4_CAN_SEND_KEY_UP,
} state;
// Buffer for 20 characters
static uint8_t ascii_input_storage[20];
static btstack_ring_buffer_t ascii_input_buffer;
static void typing_can_send_now(void){
switch (state){
case W4_CAN_SEND_FROM_BUFFER:
while (1){
uint8_t c;
uint32_t num_bytes_read;
btstack_ring_buffer_read(&ascii_input_buffer, &c, 1, &num_bytes_read);
if (num_bytes_read == 0){
state = W4_INPUT;
break;
}
uint8_t modifier;
uint8_t keycode;
int found = keycode_and_modifer_us_for_character(c, &keycode, &modifier);
if (!found) continue;
printf("sending: %c\n", c);
send_report(modifier, keycode);
state = W4_CAN_SEND_KEY_UP;
hids_device_request_can_send_now_event(con_handle);
break;
}
break;
case W4_CAN_SEND_KEY_UP:
send_report(0, 0);
if (btstack_ring_buffer_bytes_available(&ascii_input_buffer)){
state = W4_CAN_SEND_FROM_BUFFER;
hids_device_request_can_send_now_event(con_handle);
} else {
state = W4_INPUT;
}
break;
default:
break;
}
}
static void stdin_process(char character){
uint8_t c = character;
btstack_ring_buffer_write(&ascii_input_buffer, &c, 1);
// start sending
if (state == W4_INPUT && con_handle != HCI_CON_HANDLE_INVALID){
state = W4_CAN_SEND_FROM_BUFFER;
hids_device_request_can_send_now_event(con_handle);
}
}
#else
// On embedded systems, send constant demo text with fixed period
#define TYPING_PERIOD_MS 50
static const char * demo_text = "\n\nHello World!\n\nThis is the BTstack HID Keyboard Demo running on an Embedded Device.\n\n";
static int demo_pos;
static btstack_timer_source_t typing_timer;
static int send_keycode;
static int send_modifier;
static int send_keyup;
static void send_key(int modifier, int keycode){
send_keycode = keycode;
send_modifier = modifier;
hids_device_request_can_send_now_event(con_handle);
}
static void typing_can_send_now(void){
send_report(send_modifier, send_keycode);
}
static void typing_timer_handler(btstack_timer_source_t * ts){
if (send_keyup){
// just send key up
send_keyup = 0;
send_key(0, 0);
} else {
// get next character
uint8_t character = demo_text[demo_pos++];
if (demo_text[demo_pos] == 0){
demo_pos = 0;
}
// get keycode and send
uint8_t modifier;
uint8_t keycode;
int found = keycode_and_modifer_us_for_character(character, &keycode, &modifier);
if (found){
printf("%c\n", character);
send_key(modifier, keycode);
send_keyup = 1;
}
}
// set next timer
btstack_run_loop_set_timer(ts, TYPING_PERIOD_MS);
btstack_run_loop_add_timer(ts);
}
static void hid_embedded_start_typing(void){
printf("Start typing..\n");
demo_pos = 0;
// set one-shot timer
typing_timer.process = &typing_timer_handler;
btstack_run_loop_set_timer(&typing_timer, TYPING_PERIOD_MS);
btstack_run_loop_add_timer(&typing_timer);
}
#endif
static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
UNUSED(channel);
UNUSED(size);
switch (packet_type) {
case HCI_EVENT_PACKET:
switch (hci_event_packet_get_type(packet)) {
case HCI_EVENT_DISCONNECTION_COMPLETE:
con_handle = HCI_CON_HANDLE_INVALID;
printf("Disconnected\n");
break;
case SM_EVENT_JUST_WORKS_REQUEST:
printf("Just Works requested\n");
sm_just_works_confirm(sm_event_just_works_request_get_handle(packet));
break;
case SM_EVENT_NUMERIC_COMPARISON_REQUEST:
printf("Confirming numeric comparison: %"PRIu32"\n", sm_event_numeric_comparison_request_get_passkey(packet));
sm_numeric_comparison_confirm(sm_event_passkey_display_number_get_handle(packet));
break;
case SM_EVENT_PASSKEY_DISPLAY_NUMBER:
printf("Display Passkey: %"PRIu32"\n", sm_event_passkey_display_number_get_passkey(packet));
break;
case HCI_EVENT_HIDS_META:
switch (hci_event_hids_meta_get_subevent_code(packet)){
case HIDS_SUBEVENT_INPUT_REPORT_ENABLE:
con_handle = hids_subevent_input_report_enable_get_con_handle(packet);
printf("Report Characteristic Subscribed %u\n", hids_subevent_input_report_enable_get_enable(packet));
#ifndef HAVE_BTSTACK_STDIN
hid_embedded_start_typing();
#endif
break;
case HIDS_SUBEVENT_BOOT_KEYBOARD_INPUT_REPORT_ENABLE:
con_handle = hids_subevent_boot_keyboard_input_report_enable_get_con_handle(packet);
printf("Boot Keyboard Characteristic Subscribed %u\n", hids_subevent_boot_keyboard_input_report_enable_get_enable(packet));
break;
case HIDS_SUBEVENT_PROTOCOL_MODE:
protocol_mode = hids_subevent_protocol_mode_get_protocol_mode(packet);
printf("Protocol Mode: %s mode\n", hids_subevent_protocol_mode_get_protocol_mode(packet) ? "Report" : "Boot");
break;
case HIDS_SUBEVENT_CAN_SEND_NOW:
typing_can_send_now();
break;
default:
break;
}
}
break;
}
}
int btstack_main(void);
int btstack_main(void)
{
le_keyboard_setup();
#ifdef HAVE_BTSTACK_STDIN
btstack_ring_buffer_init(&ascii_input_buffer, ascii_input_storage, sizeof(ascii_input_storage));
btstack_stdin_setup(stdin_process);
#endif
// turn on!
hci_power_control(HCI_POWER_ON);
return 0;
}
/* EXAMPLE_END */
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