kenji/pico_ble_hid
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kenji
2025-08-13 06:37:47 -04:00
commit 77fe11c758
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bt_device.c
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#define BTSTACK_FILE__ "bt_device.c"
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include "pico/cyw43_arch.h"
#include "pico/btstack_cyw43.h"
#include "pico/multicore.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"
#include "hid_report.h"
#include "usb_device.h"
#include "usb_host.h"
#include "bt_device.h"
#include "ble_hid.h"
static btstack_packet_callback_registration_t hci_event_callback_registration;
static btstack_packet_callback_registration_t l2cap_event_callback_registration;
static btstack_packet_callback_registration_t sm_event_callback_registration;
static uint8_t battery = 100;
hci_con_handle_t con_handle = HCI_CON_HANDLE_INVALID;
static uint8_t protocol_mode = 1;
static hids_device_report_t *dev_report_storage;
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, 'P', 'i', 'c', 'o', ' ', 'B', 'L', 'E', ' ', 'H','I','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 bt_hid_setup(void);
static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size);
//extern uint8_t desc_hid_report[];
//extern uint16_t desc_hid_report_len;
// start BTstack
void btstack_main(void){
bt_hid_setup();
init_report_buf();
hci_power_control(HCI_POWER_ON);
}
static void bt_hid_setup(void) {
cyw43_arch_init();
l2cap_init();
// setup SM: Display only
sm_init();
sm_set_io_capabilities(IO_CAPABILITY_NO_INPUT_NO_OUTPUT);
//sm_set_authentication_requirements(SM_AUTHREQ_SECURE_CONNECTION | SM_AUTHREQ_BONDING);
sm_set_authentication_requirements(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
dev_report_storage = (hids_device_report_t *)malloc(sizeof(hids_device_report_t)*NUM_REPORT_IDS);
hids_device_init_with_storage(0, get_desc_hid_report(), get_desc_hid_report_len(), NUM_REPORT_IDS, dev_report_storage);
// 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 connection parameter updates
l2cap_event_callback_registration.callback = &packet_handler;
l2cap_add_event_handler(&l2cap_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);
}
// handler for BTStack packets
static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
(void) channel;
(void) size;
uint16_t conn_interval;
if (packet_type != HCI_EVENT_PACKET) return;
switch (hci_event_packet_get_type(packet)) {
case HCI_EVENT_DISCONNECTION_COMPLETE:
con_handle = HCI_CON_HANDLE_INVALID;
printf("Disconnected\n");
set_host_state(HOST_STOP_LISTEN);
cyw43_arch_gpio_put(CYW43_WL_GPIO_LED_PIN, 0);
break;
case SM_EVENT_JUST_WORKS_REQUEST:
printf("Just Works requested\n");
sm_just_works_confirm(sm_event_just_works_request_get_handle(packet));
cyw43_arch_gpio_put(CYW43_WL_GPIO_LED_PIN, 0);
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 L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_RESPONSE:
printf("L2CAP Connection Parameter Update Complete, response: %x\n", l2cap_event_connection_parameter_update_response_get_result(packet));
break;
case HCI_EVENT_LE_META:
switch (hci_event_le_meta_get_subevent_code(packet)) {
case HCI_SUBEVENT_LE_CONNECTION_COMPLETE:
// print connection parameters (without using float operations)
conn_interval = hci_subevent_le_connection_complete_get_conn_interval(packet);
printf("LE Connection Complete:\n");
printf("- Connection Interval: %u.%02u ms\n", conn_interval * 125 / 100, 25 * (conn_interval & 3));
printf("- Connection Latency: %u\n", hci_subevent_le_connection_complete_get_conn_latency(packet));
break;
case HCI_SUBEVENT_LE_CONNECTION_UPDATE_COMPLETE:
// print connection parameters (without using float operations)
conn_interval = hci_subevent_le_connection_update_complete_get_conn_interval(packet);
printf("LE Connection Update:\n");
printf("- Connection Interval: %u.%02u ms\n", conn_interval * 125 / 100, 25 * (conn_interval & 3));
printf("- Connection Latency: %u\n", hci_subevent_le_connection_update_complete_get_conn_latency(packet));
break;
default:
break;
}
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));
set_host_state(HOST_START_LISTEN);
cyw43_arch_gpio_put(CYW43_WL_GPIO_LED_PIN, 1);
// request connection param update via L2CAP following Apple Bluetooth Design Guidelines
// gap_request_connection_parameter_update(con_handle, 12, 12, 4, 100); // 15 ms, 4, 1s
// directly update connection params via HCI following Apple Bluetooth Design Guidelines
// gap_update_connection_parameters(con_handle, 12, 12, 4, 100); // 60-75 ms, 4, 1s
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:
printf("HIDS_SUBEVENT_CAN_SEND_NOW\n");
send_report();
cyw43_arch_gpio_put(CYW43_WL_GPIO_LED_PIN, 1-cyw43_arch_gpio_get(CYW43_WL_GPIO_LED_PIN));
break;
default:
break;
}
break;
default:
break;
}
}
// called to update the report map aka HID report descriptor on the BT interface
void update_desc_hid_report(void) {
hci_power_control(HCI_POWER_OFF);
uint16_t len = get_desc_hid_report_len();
if (len>0) {
hids_device_init_with_storage(0, get_desc_hid_report(), len, NUM_REPORT_IDS, dev_report_storage);
hci_power_control(HCI_POWER_ON);
}
}