SDK • Connecting a bluetooth classic mouse to Pico W

Code:

# Generated Cmake Pico project filecmake_minimum_required(VERSION 3.13)set(CMAKE_C_STANDARD 11)set(CMAKE_CXX_STANDARD 17)set(CMAKE_EXPORT_COMPILE_COMMANDS ON)# Initialise pico_sdk from installed location# (note this can come from environment, CMake cache etc)# == DO NOT EDIT THE FOLLOWING LINES for the Raspberry Pi Pico VS Code Extension to work ==if(WIN32)    set(USERHOME $ENV{USERPROFILE})else()    set(USERHOME $ENV{HOME})endif()set(sdkVersion 2.0.0)set(toolchainVersion 13_2_Rel1)set(picotoolVersion 2.0.0)set(picoVscode ${USERHOME}/.pico-sdk/cmake/pico-vscode.cmake)if (EXISTS ${picoVscode})    include(${picoVscode})endif()# ====================================================================================set(PICO_BOARD pico_w CACHE STRING "Board type")# Pull in Raspberry Pi Pico SDK (must be before project)include(pico_sdk_import.cmake)project(hid_host C CXX ASM)# Initialise the Raspberry Pi Pico SDKpico_sdk_init()# Add executable. Default name is the project name, version 0.1add_executable(hid_host hid_host.c hid_host_demo.c)pico_set_program_name(hid_host "hid_host")pico_set_program_version(hid_host "0.1")# Modify the below lines to enable/disable output over UART/USBpico_enable_stdio_uart(hid_host 0)pico_enable_stdio_usb(hid_host 1)# Add the standard library to the buildtarget_link_libraries(hid_host PUBLICpico_stdlibpico_btstack_classicpico_btstack_blepico_btstack_cyw43pico_cyw43_arch_nonehardware_adc)# Add the standard include files to the buildtarget_include_directories(hid_host PRIVATE  ${CMAKE_CURRENT_LIST_DIR})# Add any user requested librariestarget_link_libraries(hid_host )pico_add_extra_outputs(hid_host)

Code:

#include <stdio.h>#include "pico/stdlib.h"#include "pico/cyw43_arch.h"extern int btstack_main(int argc, const char * argv[]);int main(){    stdio_init_all();        if (cyw43_arch_init()) {        printf("cyw43 init error");        return 0;    }                   btstack_main(0, NULL);      while(1) {        tight_loop_contents();    }    return 0;}

Code:

/* * Copyright (C) 2017 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 BLUEKITCHEN * GMBH 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__ "hid_host_demo.c"/* * hid_host_demo.c *//* EXAMPLE_START(hid_host_demo): HID Host Classic * * @text This example implements a HID Host. For now, it connects to a fixed device. * It will connect in Report protocol mode if this mode is supported by the HID Device, * otherwise it will fall back to BOOT protocol mode.  */#include <inttypes.h>#include <stdio.h>#include "btstack_config.h"#include "btstack.h"#define MAX_ATTRIBUTE_VALUE_SIZE 300// MBP 2016 static const char * remote_addr_string = "F4-0F-24-3B-1B-E1";// iMpulse static const char * remote_addr_string = "64:6E:6C:C1:AA:B5";// Logitec static const char * remote_addr_string = "00:06:66:19:7F:96";static bd_addr_t remote_addr;static btstack_packet_callback_registration_t hci_event_callback_registration;// Simplified US Keyboard with Shift modifier#define CHAR_ILLEGAL     0xff#define CHAR_RETURN     '\n'#define CHAR_ESCAPE      27#define CHAR_TAB         '\t'#define CHAR_BACKSPACE   0x7f/** * 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 */}; // SDPstatic uint8_t hid_descriptor_storage[MAX_ATTRIBUTE_VALUE_SIZE];// Appstatic enum {    APP_IDLE,    APP_CONNECTED} app_state = APP_IDLE;static uint16_t hid_host_cid = 0;static bool     hid_host_descriptor_available = false;static hid_protocol_mode_t hid_host_report_mode = HID_PROTOCOL_MODE_REPORT_WITH_FALLBACK_TO_BOOT;/* @section Main application configuration * * @text In the application configuration, L2CAP and HID host are initialized, and the link policies  * are set to allow sniff mode and role change.  *//* LISTING_START(PanuSetup): Panu setup */static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size);static void hid_host_setup(void){    // Initialize L2CAP    l2cap_init();#ifdef ENABLE_BLE    // Initialize LE Security Manager. Needed for cross-transport key derivation    sm_init();#endif    // Initialize HID Host    hid_host_init(hid_descriptor_storage, sizeof(hid_descriptor_storage));    hid_host_register_packet_handler(packet_handler);    // Allow sniff mode requests by HID device and support role switch    gap_set_default_link_policy_settings(LM_LINK_POLICY_ENABLE_SNIFF_MODE | LM_LINK_POLICY_ENABLE_ROLE_SWITCH);    // try to become master on incoming connections    hci_set_master_slave_policy(HCI_ROLE_MASTER);    // register for HCI events    hci_event_callback_registration.callback = &packet_handler;    hci_add_event_handler(&hci_event_callback_registration);    // Disable stdout buffering    setvbuf(stdin, NULL, _IONBF, 0);}/* LISTING_END *//* * @section HID Report Handler *  * @text Use BTstack's compact HID Parser to process incoming HID Report in Report protocol mode.  * Iterate over all fields and process fields with usage page = 0x07 / Keyboard * Check if SHIFT is down and process first character (don't handle multiple key presses) *  */#define NUM_KEYS 6static uint8_t last_keys[NUM_KEYS];static void hid_host_handle_interrupt_report(const uint8_t * report, uint16_t report_len){    // check if HID Input Report    if (report_len < 1) return;    if (*report != 0xa1) return;         report++;    report_len--;        btstack_hid_parser_t parser;    btstack_hid_parser_init(&parser,         hid_descriptor_storage_get_descriptor_data(hid_host_cid),         hid_descriptor_storage_get_descriptor_len(hid_host_cid),         HID_REPORT_TYPE_INPUT, report, report_len);    int shift = 0;    uint8_t new_keys[NUM_KEYS];    memset(new_keys, 0, sizeof(new_keys));    int     new_keys_count = 0;    while (btstack_hid_parser_has_more(&parser)){        uint16_t usage_page;        uint16_t usage;        int32_t  value;        btstack_hid_parser_get_field(&parser, &usage_page, &usage, &value);        if (usage_page != 0x07) continue;           switch (usage){            case 0xe1:            case 0xe6:                if (value){                    shift = 1;                }                continue;            case 0x00:                continue;            default:                break;        }        if (usage >= sizeof(keytable_us_none)) continue;        // store new keys        new_keys[new_keys_count++] = (uint8_t) usage;        // check if usage was used last time (and ignore in that case)        int i;        for (i=0;i<NUM_KEYS;i++){            if (usage == last_keys[i]){                usage = 0;            }        }        if (usage == 0) continue;        uint8_t key;        if (shift){            key = keytable_us_shift[usage];        } else {            key = keytable_us_none[usage];        }        if (key == CHAR_ILLEGAL) continue;        if (key == CHAR_BACKSPACE){             printf("\b \b");    // go back one char, print space, go back one char again            continue;        }        printf("%c", key);    }    memcpy(last_keys, new_keys, NUM_KEYS);}/* * @section Packet Handler *  * @text The packet handler responds to various HID events. *//* LISTING_START(packetHandler): Packet Handler */static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){    /* LISTING_PAUSE */    UNUSED(channel);    UNUSED(size);    uint8_t   event;    bd_addr_t event_addr;    uint8_t   status;    /* LISTING_RESUME */    switch (packet_type) {case HCI_EVENT_PACKET:            event = hci_event_packet_get_type(packet);                        switch (event) {            #ifndef HAVE_BTSTACK_STDIN                /* @text When BTSTACK_EVENT_STATE with state HCI_STATE_WORKING                 * is received and the example is started in client mode, the remote SDP HID query is started.                 */                case BTSTACK_EVENT_STATE:                    if (btstack_event_state_get_state(packet) == HCI_STATE_WORKING){                        status = hid_host_connect(remote_addr, hid_host_report_mode, &hid_host_cid);                        if (status != ERROR_CODE_SUCCESS){                            printf("HID host connect failed, status 0x%02x.\n", status);                        }                    }                    break;#endif                /* LISTING_PAUSE */                case HCI_EVENT_PIN_CODE_REQUEST:// inform about pin code request                    printf("Pin code request - using '1234'\n");                    hci_event_pin_code_request_get_bd_addr(packet, event_addr);                    gap_pin_code_response(event_addr, "1234");break;                case HCI_EVENT_USER_CONFIRMATION_REQUEST:                    // inform about user confirmation request                    printf("SSP User Confirmation Request with numeric value '%"PRIu32"'\n", little_endian_read_32(packet, 8));                    printf("SSP User Confirmation Auto accept\n");                    break;                /* LISTING_RESUME */                case HCI_EVENT_HID_META:                    switch (hci_event_hid_meta_get_subevent_code(packet)){                        case HID_SUBEVENT_INCOMING_CONNECTION:                            // There is an incoming connection: we can accept it or decline it.                            // The hid_host_report_mode in the hid_host_accept_connection function                             // allows the application to request a protocol mode.                             // For available protocol modes, see hid_protocol_mode_t in btstack_hid.h file.                             hid_host_accept_connection(hid_subevent_incoming_connection_get_hid_cid(packet), hid_host_report_mode);                            break;                                                case HID_SUBEVENT_CONNECTION_OPENED:                            // The status field of this event indicates if the control and interrupt                            // connections were opened successfully.                            status = hid_subevent_connection_opened_get_status(packet);                            if (status != ERROR_CODE_SUCCESS) {                                printf("Connection failed, status 0x%02x\n", status);                                app_state = APP_IDLE;                                hid_host_cid = 0;                                return;                            }                            app_state = APP_CONNECTED;                            hid_host_descriptor_available = false;                            hid_host_cid = hid_subevent_connection_opened_get_hid_cid(packet);                            printf("HID Host connected.\n");                            break;                        case HID_SUBEVENT_DESCRIPTOR_AVAILABLE:                            // This event will follows HID_SUBEVENT_CONNECTION_OPENED event.                             // For incoming connections, i.e. HID Device initiating the connection,                            // the HID_SUBEVENT_DESCRIPTOR_AVAILABLE is delayed, and some HID                              // reports may be received via HID_SUBEVENT_REPORT event. It is up to                             // the application if these reports should be buffered or ignored until                             // the HID descriptor is available.                            status = hid_subevent_descriptor_available_get_status(packet);                            if (status == ERROR_CODE_SUCCESS){                                hid_host_descriptor_available = true;                                printf("HID Descriptor available, please start typing.\n");                            } else {                                printf("Cannot handle input report, HID Descriptor is not available, status 0x%02x\n", status);                            }                            break;                        case HID_SUBEVENT_REPORT:                            // Handle input report.                            if (hid_host_descriptor_available){                                hid_host_handle_interrupt_report(hid_subevent_report_get_report(packet), hid_subevent_report_get_report_len(packet));                            } else {                                printf_hexdump(hid_subevent_report_get_report(packet), hid_subevent_report_get_report_len(packet));                            }                            break;                        case HID_SUBEVENT_SET_PROTOCOL_RESPONSE:                            // For incoming connections, the library will set the protocol mode of the                            // HID Device as requested in the call to hid_host_accept_connection. The event                             // reports the result. For connections initiated by calling hid_host_connect,                             // this event will occur only if the established report mode is boot mode.                            status = hid_subevent_set_protocol_response_get_handshake_status(packet);                            if (status != HID_HANDSHAKE_PARAM_TYPE_SUCCESSFUL){                                printf("Error set protocol, status 0x%02x\n", status);                                break;                            }                            switch ((hid_protocol_mode_t)hid_subevent_set_protocol_response_get_protocol_mode(packet)){                                case HID_PROTOCOL_MODE_BOOT:                                    printf("Protocol mode set: BOOT.\n");                                    break;                                  case HID_PROTOCOL_MODE_REPORT:                                    printf("Protocol mode set: REPORT.\n");                                    break;                                default:                                    printf("Unknown protocol mode.\n");                                    break;                             }                            break;                        case HID_SUBEVENT_CONNECTION_CLOSED:                            // The connection was closed.                            hid_host_cid = 0;                            hid_host_descriptor_available = false;                            printf("HID Host disconnected.\n");                            break;                                                default:                            break;                    }                    break;                default:                    break;            }            break;        default:            break;    }}/* LISTING_END */#ifdef HAVE_BTSTACK_STDINstatic void show_usage(void){    bd_addr_t      iut_address;    gap_local_bd_addr(iut_address);    printf("\n--- Bluetooth HID Host Console %s ---\n", bd_addr_to_str(iut_address));    printf("c      - Connect to %s in report mode, with fallback to boot mode.\n", remote_addr_string);    printf("C      - Disconnect\n");        printf("\n");    printf("Ctrl-c - exit\n");    printf("---\n");}static void stdin_process(char cmd){    uint8_t status = ERROR_CODE_SUCCESS;    switch (cmd){        case 'c':            printf("Connect to %s in report mode, with fallback to boot mode.\n", remote_addr_string);            status = hid_host_connect(remote_addr, hid_host_report_mode, &hid_host_cid);            break;        case 'C':            printf("Disconnect...\n");            hid_host_disconnect(hid_host_cid);            break;        case '\n':        case '\r':            break;        default:            show_usage();            break;    }    if (status != ERROR_CODE_SUCCESS){        printf("HID host cmd \'%c\' failed, status 0x%02x\n", cmd, status);    }}#endifint btstack_main(int argc, const char * argv[]);int btstack_main(int argc, const char * argv[]){    (void)argc;    (void)argv;    hid_host_setup();    // parse human readable Bluetooth address    sscanf_bd_addr(remote_addr_string, remote_addr);#ifdef HAVE_BTSTACK_STDIN    btstack_stdin_setup(stdin_process);#endif    // Turn on the device     hci_power_control(HCI_POWER_ON);    return 0;}/* EXAMPLE_END */