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circuitpython/devices/ble_hci/common-hal/_bleio/Adapter.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2020 Dan Halbert for Adafruit Industries
* Copyright (c) 2016 Glenn Ruben Bakke
* Copyright (c) 2018 Artur Pacholec
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <math.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include "hci.h"
#include "py/gc.h"
#include "py/mphal.h"
#include "py/objstr.h"
#include "py/runtime.h"
#include "supervisor/shared/safe_mode.h"
#include "supervisor/shared/tick.h"
#include "supervisor/usb.h"
#include "shared-bindings/_bleio/__init__.h"
#include "shared-bindings/_bleio/Adapter.h"
#include "shared-bindings/_bleio/Address.h"
#include "shared-bindings/_bleio/Characteristic.h"
#include "shared-bindings/_bleio/Service.h"
#include "shared-bindings/_bleio/Connection.h"
#include "shared-bindings/_bleio/ScanEntry.h"
#include "shared-bindings/time/__init__.h"
#if CIRCUITPY_OS_GETENV
#include "shared-bindings/os/__init__.h"
#endif
#define MSEC_TO_UNITS(TIME, RESOLUTION) (((TIME) * 1000) / (RESOLUTION))
#define SEC_TO_UNITS(TIME, RESOLUTION) (((TIME) * 1000000) / (RESOLUTION))
#define UNITS_TO_SEC(TIME, RESOLUTION) (((TIME)*(RESOLUTION)) / 1000000)
// 0.625 msecs (625 usecs)
#define ADV_INTERVAL_UNIT_FLOAT_SECS (0.000625)
// Microseconds is the base unit. The macros above know that.
#define UNIT_0_625_MS (625)
#define UNIT_1_25_MS (1250)
#define UNIT_10_MS (10000)
#define MAX_ADVERTISEMENT_SIZE (31)
// TODO make this settable from Python.
#define DEFAULT_TX_POWER 0 // 0 dBm
#define MAX_ANONYMOUS_ADV_TIMEOUT_SECS (60 * 15)
#define MAX_LIMITED_DISCOVERABLE_ADV_TIMEOUT_SECS (180)
#define BLE_MIN_CONN_INTERVAL MSEC_TO_UNITS(15, UNIT_0_625_MS)
#define BLE_MAX_CONN_INTERVAL MSEC_TO_UNITS(15, UNIT_0_625_MS)
#define BLE_SLAVE_LATENCY 0
#define BLE_CONN_SUP_TIMEOUT MSEC_TO_UNITS(4000, UNIT_10_MS)
bleio_connection_internal_t bleio_connections[BLEIO_TOTAL_CONNECTION_COUNT];
STATIC void add_generic_services(bleio_adapter_obj_t *adapter) {
// Create Generic Access UUID, Service, and Characteristics.
// Generic Access Service setup.
bleio_uuid_obj_t *generic_access_service_uuid = mp_obj_malloc(bleio_uuid_obj_t, &bleio_uuid_type);
common_hal_bleio_uuid_construct(generic_access_service_uuid, 0x1800, NULL);
bleio_uuid_obj_t *device_name_characteristic_uuid = mp_obj_malloc(bleio_uuid_obj_t, &bleio_uuid_type);
common_hal_bleio_uuid_construct(device_name_characteristic_uuid, 0x2A00, NULL);
bleio_uuid_obj_t *appearance_characteristic_uuid = mp_obj_malloc(bleio_uuid_obj_t, &bleio_uuid_type);
common_hal_bleio_uuid_construct(appearance_characteristic_uuid, 0x2A01, NULL);
// Not implemented:
// Peripheral Preferred Connection Parameters
// Central Address Resolution
bleio_service_obj_t *generic_access_service = mp_obj_malloc(bleio_service_obj_t, &bleio_service_type);
common_hal_bleio_service_construct(generic_access_service, generic_access_service_uuid, false);
adapter->device_name_characteristic = mp_obj_malloc(bleio_characteristic_obj_t, &bleio_characteristic_type);
char generic_name[] = { 'C', 'I', 'R', 'C', 'U', 'I', 'T', 'P', 'Y', 'n', 'n', 'n', 'n' };
mp_buffer_info_t generic_name_bufinfo = {
.buf = generic_name,
.len = sizeof(generic_name),
};
// Will be added to service by constructor.
common_hal_bleio_characteristic_construct(
adapter->device_name_characteristic,
generic_access_service,
BLE_GATT_HANDLE_INVALID,
device_name_characteristic_uuid,
CHAR_PROP_READ,
SECURITY_MODE_OPEN,
SECURITY_MODE_NO_ACCESS,
248, // max length, from Bluetooth spec
false, // not fixed length
&generic_name_bufinfo,
NULL
);
uint16_t zero_16 = 0;
mp_buffer_info_t zero_16_value = {
.buf = &zero_16,
.len = sizeof(zero_16),
};
adapter->appearance_characteristic = mp_obj_malloc(bleio_characteristic_obj_t, &bleio_characteristic_type);
common_hal_bleio_characteristic_construct(
adapter->appearance_characteristic,
generic_access_service,
BLE_GATT_HANDLE_INVALID,
appearance_characteristic_uuid,
CHAR_PROP_READ,
SECURITY_MODE_OPEN,
SECURITY_MODE_NO_ACCESS,
2, // max length, from Bluetooth spec
true, // fixed length
&zero_16_value,
NULL
);
// Generic Attribute Service setup.
bleio_uuid_obj_t *generic_attribute_service_uuid = mp_obj_malloc(bleio_uuid_obj_t, &bleio_uuid_type);
common_hal_bleio_uuid_construct(generic_attribute_service_uuid, 0x1801, NULL);
bleio_uuid_obj_t *service_changed_characteristic_uuid = mp_obj_malloc(bleio_uuid_obj_t, &bleio_uuid_type);
common_hal_bleio_uuid_construct(service_changed_characteristic_uuid, 0x2A05, NULL);
bleio_service_obj_t *generic_attribute_service = mp_obj_malloc(bleio_service_obj_t, &bleio_service_type);
common_hal_bleio_service_construct(generic_attribute_service, generic_attribute_service_uuid, false);
adapter->service_changed_characteristic = mp_obj_malloc(bleio_characteristic_obj_t, &bleio_characteristic_type);
uint32_t zero_32 = 0;
mp_buffer_info_t zero_32_value = {
.buf = &zero_32,
.len = sizeof(zero_32),
};
common_hal_bleio_characteristic_construct(
adapter->service_changed_characteristic,
generic_attribute_service,
BLE_GATT_HANDLE_INVALID,
service_changed_characteristic_uuid,
CHAR_PROP_INDICATE,
SECURITY_MODE_OPEN,
SECURITY_MODE_NO_ACCESS,
4, // max length, from Bluetooth spec
true, // fixed length
&zero_32_value,
NULL
);
}
STATIC void check_enabled(bleio_adapter_obj_t *adapter) {
if (!common_hal_bleio_adapter_get_enabled(adapter)) {
mp_raise_bleio_BluetoothError(MP_ERROR_TEXT("Adapter not enabled"));
}
}
// STATIC bool adapter_on_ble_evt(ble_evt_t *ble_evt, void *self_in) {
// bleio_adapter_obj_t *self = (bleio_adapter_obj_t*)self_in;
// // For debugging.
// // mp_printf(&mp_plat_print, "Adapter event: 0x%04x\n", ble_evt->header.evt_id);
// switch (ble_evt->header.evt_id) {
// case BLE_GAP_EVT_CONNECTED: {
// // Find an empty connection. One must always be available because the SD has the same
// // total connection limit.
// bleio_connection_internal_t *connection;
// for (size_t i = 0; i < BLEIO_TOTAL_CONNECTION_COUNT; i++) {
// connection = &bleio_connections[i];
// if (connection->conn_handle == BLE_CONN_HANDLE_INVALID) {
// break;
// }
// }
// // Central has connected.
// ble_gap_evt_connected_t* connected = &ble_evt->evt.gap_evt.params.connected;
// connection->conn_handle = ble_evt->evt.gap_evt.conn_handle;
// connection->connection_obj = mp_const_none;
// connection->pair_status = PAIR_NOT_PAIRED;
// connection->mtu = 0;
// ble_drv_add_event_handler_entry(&connection->handler_entry, connection_on_ble_evt, connection);
// self->connection_objs = NULL;
// // Save the current connection parameters.
// memcpy(&connection->conn_params, &connected->conn_params, sizeof(ble_gap_conn_params_t));
// #if CIRCUITPY_VERBOSE_BLE
// ble_gap_conn_params_t *cp = &connected->conn_params;
// mp_printf(&mp_plat_print, "conn params: min_ci %d max_ci %d s_l %d sup_timeout %d\n", cp->min_conn_interval, cp->max_conn_interval, cp->slave_latency, cp->conn_sup_timeout);
// #endif
// // See if connection interval set by Central is out of range.
// // If so, negotiate our preferred range.
// ble_gap_conn_params_t conn_params;
// sd_ble_gap_ppcp_get(&conn_params);
// if (conn_params.min_conn_interval < connected->conn_params.min_conn_interval ||
// conn_params.min_conn_interval > connected->conn_params.max_conn_interval) {
// sd_ble_gap_conn_param_update(ble_evt->evt.gap_evt.conn_handle, &conn_params);
// }
// self->current_advertising_data = NULL;
// break;
// }
// case BLE_GAP_EVT_DISCONNECTED: {
// // Find the connection that was disconnected.
// bleio_connection_internal_t *connection;
// for (size_t i = 0; i < BLEIO_TOTAL_CONNECTION_COUNT; i++) {
// connection = &bleio_connections[i];
// if (connection->conn_handle == ble_evt->evt.gap_evt.conn_handle) {
// break;
// }
// }
// ble_drv_remove_event_handler(connection_on_ble_evt, connection);
// connection->conn_handle = BLE_CONN_HANDLE_INVALID;
// connection->pair_status = PAIR_NOT_PAIRED;
// if (connection->connection_obj != mp_const_none) {
// bleio_connection_obj_t* obj = connection->connection_obj;
// obj->connection = NULL;
// obj->disconnect_reason = ble_evt->evt.gap_evt.params.disconnected.reason;
// }
// self->connection_objs = NULL;
// break;
// }
// case BLE_GAP_EVT_ADV_SET_TERMINATED:
// self->current_advertising_data = NULL;
// break;
// default:
// // For debugging.
// // mp_printf(&mp_plat_print, "Unhandled adapter event: 0x%04x\n", ble_evt->header.evt_id);
// return false;
// break;
// }
// return true;
// }
char default_ble_name[] = { 'C', 'I', 'R', 'C', 'U', 'I', 'T', 'P', 'Y', 0, 0, 0, 0};
// Get various values and limits set by the adapter.
// Set event mask.
STATIC void bleio_adapter_hci_init(bleio_adapter_obj_t *self) {
mp_int_t name_len = 0;
#if CIRCUITPY_OS_GETENV
mp_obj_t name = common_hal_os_getenv("CIRCUITPY_BLE_NAME", mp_const_none);
if (name != mp_const_none) {
mp_arg_validate_type_string(name, MP_QSTR_CIRCUITPY_BLE_NAME);
self->name = name;
}
#endif
if (!self->name) {
name_len = sizeof(default_ble_name);
bt_addr_t addr;
hci_check_error(hci_read_bd_addr(&addr));
default_ble_name[name_len - 4] = nibble_to_hex_lower[addr.val[1] >> 4 & 0xf];
default_ble_name[name_len - 3] = nibble_to_hex_lower[addr.val[1] & 0xf];
default_ble_name[name_len - 2] = nibble_to_hex_lower[addr.val[0] >> 4 & 0xf];
default_ble_name[name_len - 1] = nibble_to_hex_lower[addr.val[0] & 0xf];
self->name = mp_obj_new_str(default_ble_name, (uint8_t)name_len);
}
// Get version information.
if (hci_read_local_version(&self->hci_version, &self->hci_revision, &self->lmp_version,
&self->manufacturer, &self->lmp_subversion) != HCI_OK) {
mp_raise_bleio_BluetoothError(MP_ERROR_TEXT("Could not read HCI version"));
}
// Get supported features.
if (hci_le_read_local_supported_features(self->features) != HCI_OK) {
mp_raise_bleio_BluetoothError(MP_ERROR_TEXT("Could not read BLE features"));
}
// Enabled desired events.
// Most importantly, includes:
// BT_EVT_MASK_LE_META_EVENT BT_EVT_BIT(61)
if (hci_set_event_mask(0x3FFFFFFFFFFFFFFF) != HCI_OK) {
mp_raise_bleio_BluetoothError(MP_ERROR_TEXT("Could not set event mask"));
}
// The default events for LE are:
// BT_EVT_MASK_LE_CONN_COMPLETE, BT_EVT_MASK_LE_ADVERTISING_REPORT,
// BT_EVT_MASK_LE_CONN_UPDATE_COMPLETE, BT_EVT_MASK_LE_REMOTE_FEAT_COMPLETE
// BT_EVT_MASK_LE_LTK_REQUEST.
// That's all we need right now, so we don't bother to set the LE event mask.
// Get ACL buffer info.
uint16_t le_max_len;
uint8_t le_max_num;
if (hci_le_read_buffer_size(&le_max_len, &le_max_num) == HCI_OK) {
self->max_acl_buffer_len = le_max_len;
self->max_acl_num_buffers = le_max_num;
} else {
// LE Read Buffer Size not available; use the general Read Buffer Size.
uint16_t acl_max_len;
uint8_t sco_max_len;
uint16_t acl_max_num;
uint16_t sco_max_num;
if (hci_read_buffer_size(&acl_max_len, &sco_max_len, &acl_max_num, &sco_max_num) != HCI_OK) {
mp_raise_bleio_BluetoothError(MP_ERROR_TEXT("Could not read BLE buffer info"));
}
self->max_acl_buffer_len = acl_max_len;
self->max_acl_num_buffers = acl_max_num;
}
// Get max advertising length if extended advertising is supported.
if (BT_FEAT_LE_EXT_ADV(self->features)) {
uint16_t max_adv_data_len;
if (hci_le_read_maximum_advertising_data_length(&max_adv_data_len) != HCI_OK) {
mp_raise_bleio_BluetoothError(MP_ERROR_TEXT("Could not get max advertising length"));
}
self->max_adv_data_len = max_adv_data_len;
} else {
self->max_adv_data_len = MAX_ADVERTISEMENT_SIZE;
}
}
void common_hal_bleio_adapter_construct_hci_uart(bleio_adapter_obj_t *self, busio_uart_obj_t *uart, digitalio_digitalinout_obj_t *rts, digitalio_digitalinout_obj_t *cts) {
self->allocated = true;
self->hci_uart = uart;
self->rts_digitalinout = rts;
self->cts_digitalinout = cts;
// Advertising-related fields are initialized by common_hal_bleio_adapter_set_enabled().
self->enabled = false;
common_hal_bleio_adapter_set_enabled(self, true);
bleio_adapter_hci_init(self);
common_hal_bleio_adapter_set_name(self, default_ble_name);
}
void common_hal_bleio_adapter_set_enabled(bleio_adapter_obj_t *self, bool enabled) {
const bool is_enabled = common_hal_bleio_adapter_get_enabled(self);
// Don't enable or disable twice
if (is_enabled == enabled) {
return;
}
self->enabled = enabled;
// We must poll for input from the HCI adapter.
// TODO Can we instead trigger an interrupt on UART input traffic?
if (enabled) {
supervisor_enable_tick();
} else {
supervisor_disable_tick();
}
// Enabling or disabling: stop any current activity; reset to known state.
hci_reset();
self->now_advertising = false;
self->extended_advertising = false;
self->circuitpython_advertising = false;
self->advertising_timeout_msecs = 0;
if (enabled) {
// Reset list of known attributes.
// Indices into the list are handles. Handle 0x0000 designates an invalid handle,
// so store None there to skip it.
self->attributes = mp_obj_new_list(0, NULL);
bleio_adapter_add_attribute(self, mp_const_none);
add_generic_services(self);
}
}
bool common_hal_bleio_adapter_get_enabled(bleio_adapter_obj_t *self) {
return self->enabled;
}
bleio_address_obj_t *common_hal_bleio_adapter_get_address(bleio_adapter_obj_t *self) {
check_enabled(self);
bt_addr_t addr;
hci_check_error(hci_read_bd_addr(&addr));
bleio_address_obj_t *address = mp_obj_malloc(bleio_address_obj_t, &bleio_address_type);
common_hal_bleio_address_construct(address, addr.val, BT_ADDR_LE_PUBLIC);
return address;
}
bool common_hal_bleio_adapter_set_address(bleio_adapter_obj_t *self, bleio_address_obj_t *address) {
mp_buffer_info_t bufinfo;
if (!mp_get_buffer(address->bytes, &bufinfo, MP_BUFFER_READ)) {
return false;
}
return hci_le_set_random_address(bufinfo.buf) == HCI_OK;
}
mp_obj_str_t *common_hal_bleio_adapter_get_name(bleio_adapter_obj_t *self) {
return self->name;
}
void common_hal_bleio_adapter_set_name(bleio_adapter_obj_t *self, const char *name) {
self->name = mp_obj_new_str(name, strlen(name));
mp_buffer_info_t bufinfo;
mp_get_buffer_raise(self->name, &bufinfo, MP_BUFFER_READ);
bleio_characteristic_set_local_value(self->device_name_characteristic, &bufinfo);
}
// STATIC bool scan_on_ble_evt(ble_evt_t *ble_evt, void *scan_results_in) {
// bleio_scanresults_obj_t *scan_results = (bleio_scanresults_obj_t*)scan_results_in;
// if (ble_evt->header.evt_id == BLE_GAP_EVT_TIMEOUT &&
// ble_evt->evt.gap_evt.params.timeout.src == BLE_GAP_TIMEOUT_SRC_SCAN) {
// shared_module_bleio_scanresults_set_done(scan_results, true);
// ble_drv_remove_event_handler(scan_on_ble_evt, scan_results);
// return true;
// }
// if (ble_evt->header.evt_id != BLE_GAP_EVT_ADV_REPORT) {
// return false;
// }
// ble_gap_evt_adv_report_t *report = &ble_evt->evt.gap_evt.params.adv_report;
// shared_module_bleio_scanresults_append(scan_results,
// supervisor_ticks_ms64(),
// report->type.connectable,
// report->type.scan_response,
// report->rssi,
// report->peer_addr.addr,
// report->peer_addr.addr_type,
// report->data.p_data,
// report->data.len);
// const uint32_t err_code = sd_ble_gap_scan_start(NULL, scan_results->common_hal_data);
// if (err_code != NRF_SUCCESS) {
// // TODO: Pass the error into the scan results so it can throw an exception.
// scan_results->done = true;
// }
// return true;
// }
mp_obj_t common_hal_bleio_adapter_start_scan(bleio_adapter_obj_t *self, uint8_t *prefixes, size_t prefix_length, bool extended, mp_int_t buffer_size, mp_float_t timeout, mp_float_t interval, mp_float_t window, mp_int_t minimum_rssi, bool active) {
// TODO
mp_raise_NotImplementedError(NULL);
check_enabled(self);
if (self->scan_results != NULL) {
if (!shared_module_bleio_scanresults_get_done(self->scan_results)) {
mp_raise_bleio_BluetoothError(MP_ERROR_TEXT("Scan already in progress. Stop with stop_scan."));
}
self->scan_results = NULL;
}
self->scan_results = shared_module_bleio_new_scanresults(buffer_size, prefixes, prefix_length, minimum_rssi);
// size_t max_packet_size = extended ? BLE_GAP_SCAN_BUFFER_EXTENDED_MAX_SUPPORTED : BLE_GAP_SCAN_BUFFER_MAX;
// uint8_t *raw_data = m_malloc(sizeof(ble_data_t) + max_packet_size);
// ble_data_t * sd_data = (ble_data_t *) raw_data;
// self->scan_results->common_hal_data = sd_data;
// sd_data->len = max_packet_size;
// sd_data->p_data = raw_data + sizeof(ble_data_t);
// ble_drv_add_event_handler(scan_on_ble_evt, self->scan_results);
// uint32_t nrf_timeout = SEC_TO_UNITS(timeout, UNIT_10_MS);
// if (timeout <= 0.0001) {
// nrf_timeout = BLE_GAP_SCAN_TIMEOUT_UNLIMITED;
// }
// ble_gap_scan_params_t scan_params = {
// .extended = extended,
// .interval = SEC_TO_UNITS(interval, UNIT_0_625_MS),
// .timeout = nrf_timeout,
// .window = SEC_TO_UNITS(window, UNIT_0_625_MS),
// .scan_phys = BLE_GAP_PHY_1MBPS,
// .active = active
// };
// uint32_t err_code;
// vm_used_ble = true;
// err_code = sd_ble_gap_scan_start(&scan_params, sd_data);
// if (err_code != NRF_SUCCESS) {
// self->scan_results = NULL;
// ble_drv_remove_event_handler(scan_on_ble_evt, self->scan_results);
// check_nrf_error(err_code);
// }
return MP_OBJ_FROM_PTR(self->scan_results);
}
void common_hal_bleio_adapter_stop_scan(bleio_adapter_obj_t *self) {
// TODO
mp_raise_NotImplementedError(NULL);
check_enabled(self);
// If not already scanning, no problem.
if (hci_le_set_scan_enable(BT_HCI_LE_SCAN_DISABLE, BT_HCI_LE_SCAN_FILTER_DUP_DISABLE) == HCI_OK) {
shared_module_bleio_scanresults_set_done(self->scan_results, true);
self->scan_results = NULL;
}
}
// typedef struct {
// uint16_t conn_handle;
// volatile bool done;
// } connect_info_t;
// STATIC bool connect_on_ble_evt(ble_evt_t *ble_evt, void *info_in) {
// connect_info_t *info = (connect_info_t*)info_in;
// switch (ble_evt->header.evt_id) {
// case BLE_GAP_EVT_CONNECTED:
// info->conn_handle = ble_evt->evt.gap_evt.conn_handle;
// info->done = true;
// break;
// case BLE_GAP_EVT_TIMEOUT:
// // Handle will be invalid.
// info->done = true;
// break;
// default:
// // For debugging.
// // mp_printf(&mp_plat_print, "Unhandled central event: 0x%04x\n", ble_evt->header.evt_id);
// return false;
// break;
// }
// return true;
// }
mp_obj_t common_hal_bleio_adapter_connect(bleio_adapter_obj_t *self, bleio_address_obj_t *address, mp_float_t timeout) {
// TODO
mp_raise_NotImplementedError(NULL);
check_enabled(self);
// ble_gap_addr_t addr;
// addr.addr_type = address->type;
// mp_buffer_info_t address_buf_info;
// mp_get_buffer_raise(address->bytes, &address_buf_info, MP_BUFFER_READ);
// memcpy(addr.addr, (uint8_t *) address_buf_info.buf, NUM_BLEIO_ADDRESS_BYTES);
// ble_gap_scan_params_t scan_params = {
// .interval = MSEC_TO_UNITS(100, UNIT_0_625_MS),
// .window = MSEC_TO_UNITS(100, UNIT_0_625_MS),
// .scan_phys = BLE_GAP_PHY_1MBPS,
// // timeout of 0 means no timeout
// .timeout = SEC_TO_UNITS(timeout, UNIT_10_MS),
// };
// ble_gap_conn_params_t conn_params = {
// .conn_sup_timeout = MSEC_TO_UNITS(4000, UNIT_10_MS),
// .min_conn_interval = MSEC_TO_UNITS(15, UNIT_1_25_MS),
// .max_conn_interval = MSEC_TO_UNITS(300, UNIT_1_25_MS),
// .slave_latency = 0, // number of conn events
// };
// connect_info_t event_info;
// ble_drv_add_event_handler(connect_on_ble_evt, &event_info);
// event_info.done = false;
vm_used_ble = true;
// uint32_t err_code = sd_ble_gap_connect(&addr, &scan_params, &conn_params, BLE_CONN_CFG_TAG_CUSTOM);
// if (err_code != NRF_SUCCESS) {
// ble_drv_remove_event_handler(connect_on_ble_evt, &event_info);
// check_nrf_error(err_code);
// }
// while (!event_info.done) {
// RUN_BACKGROUND_TASKS;
// }
// ble_drv_remove_event_handler(connect_on_ble_evt, &event_info);
// uint16_t conn_handle = event_info.conn_handle;
// if (conn_handle == BLE_CONN_HANDLE_INVALID) {
// mp_raise_bleio_BluetoothError(MP_ERROR_TEXT("Failed to connect: timeout"));
// }
// // Negotiate for better PHY, larger MTU and data lengths since we are the central. These are
// // nice-to-haves so ignore any errors.
// ble_gap_phys_t const phys = {
// .rx_phys = BLE_GAP_PHY_AUTO,
// .tx_phys = BLE_GAP_PHY_AUTO,
// };
// sd_ble_gap_phy_update(conn_handle, &phys);
// sd_ble_gattc_exchange_mtu_request(conn_handle, BLE_GATTS_VAR_ATTR_LEN_MAX);
// sd_ble_gap_data_length_update(conn_handle, NULL, NULL);
// Make the connection object and return it.
// for (size_t i = 0; i < BLEIO_TOTAL_CONNECTION_COUNT; i++) {
// bleio_connection_internal_t *connection = &bleio_connections[i];
// if (connection->conn_handle == conn_handle) {
// return bleio_connection_new_from_internal(connection);
// }
// }
mp_raise_bleio_BluetoothError(MP_ERROR_TEXT("Failed to connect: internal error"));
return mp_const_none;
}
STATIC void check_data_fit(size_t data_len, bool connectable) {
if (data_len > MAX_ADVERTISEMENT_SIZE) {
mp_raise_ValueError(MP_ERROR_TEXT("Data too large for advertisement packet"));
}
}
// STATIC bool advertising_on_ble_evt(ble_evt_t *ble_evt, void *self_in) {
// bleio_adapter_obj_t *self = (bleio_adapter_obj_t*)self_in;
// switch (ble_evt->header.evt_id) {
// case BLE_GAP_EVT_ADV_SET_TERMINATED:
// common_hal_bleio_adapter_stop_advertising(self);
// ble_drv_remove_event_handler(advertising_on_ble_evt, self_in);
// break;
// default:
// // For debugging.
// // mp_printf(&mp_plat_print, "Unhandled advertising event: 0x%04x\n", ble_evt->header.evt_id);
// return false;
// break;
// }
// return true;
// }
uint32_t _common_hal_bleio_adapter_start_advertising(bleio_adapter_obj_t *self,
bool connectable, bool anonymous, uint32_t timeout, float interval,
const uint8_t *advertising_data, uint16_t advertising_data_len,
const uint8_t *scan_response_data, uint16_t scan_response_data_len,
mp_int_t tx_power, const bleio_address_obj_t *directed_to) {
check_enabled(self);
if (self->now_advertising) {
if (self->circuitpython_advertising) {
common_hal_bleio_adapter_stop_advertising(self);
} else {
// User-requested advertising.
// TODO allow multiple advertisements.
// Already advertising. Can't advertise twice.
return 1;
}
}
// Peer address, for directed advertising
bt_addr_le_t peer_addr = { 0 };
// Copy peer address, if supplied.
if (directed_to) {
mp_buffer_info_t bufinfo;
if (mp_get_buffer(directed_to->bytes, &bufinfo, MP_BUFFER_READ)) {
peer_addr.type = directed_to->type;
memcpy(&peer_addr.a.val, bufinfo.buf, sizeof(peer_addr.a.val));
}
}
bool extended =
advertising_data_len > self->max_adv_data_len || scan_response_data_len > self->max_adv_data_len;
if (extended) {
if (!BT_FEAT_LE_EXT_ADV(self->features)) {
mp_raise_bleio_BluetoothError(MP_ERROR_TEXT("Data length needs extended advertising, but this adapter does not support it"));
}
uint16_t props = 0;
if (connectable) {
props |= BT_HCI_LE_ADV_PROP_CONN;
}
if (scan_response_data_len > 0) {
props |= BT_HCI_LE_ADV_PROP_SCAN;
}
// Advertising interval.
uint32_t interval_units = SEC_TO_UNITS(interval, UNIT_0_625_MS);
hci_check_error(
hci_le_set_extended_advertising_parameters(
0, // handle
props, // adv properties
interval_units, // min interval
interval_units, // max interval
0b111, // channel map: channels 37, 38, 39
anonymous ? BT_ADDR_LE_RANDOM : BT_ADDR_LE_PUBLIC,
&peer_addr, // peer_addr,
0x00, // filter policy: no filter
DEFAULT_TX_POWER,
BT_HCI_LE_EXT_SCAN_PHY_1M, // Secondary PHY to use
0x00, // AUX_ADV_IND shall be sent prior to next adv event
BT_HCI_LE_EXT_SCAN_PHY_1M, // Secondary PHY to use
0x00, // Advertising SID
0x00 // Scan req notify disable
));
// We can use the duration mechanism provided, instead of our own.
self->advertising_timeout_msecs = 0;
uint8_t handle[1] = { 0 };
uint16_t duration_10msec[1] = { timeout * 100 };
uint8_t max_ext_adv_evts[1] = { 0 };
hci_check_error(
hci_le_set_extended_advertising_enable(
BT_HCI_LE_ADV_ENABLE,
1, // one advertising set.
handle,
duration_10msec,
max_ext_adv_evts
));
self->extended_advertising = true;
} else {
// Legacy advertising (not extended).
uint8_t adv_type;
if (connectable) {
// Connectable, scannable, undirected.
adv_type = BT_HCI_ADV_IND;
} else if (scan_response_data_len > 0) {
// Unconnectable, scannable, undirected.
adv_type = BT_HCI_ADV_SCAN_IND;
} else {
// Unconnectable, unscannable, undirected.
adv_type = BT_HCI_ADV_NONCONN_IND;
}
// Advertising interval.
uint16_t interval_units = SEC_TO_UNITS(interval, UNIT_0_625_MS);
hci_check_error(
hci_le_set_advertising_parameters(
interval_units, // min interval
interval_units, // max interval
adv_type,
anonymous ? BT_ADDR_LE_RANDOM : BT_ADDR_LE_PUBLIC,
&peer_addr,
0b111, // channel map: channels 37, 38, 39
0x00 // filter policy: no filter
));
// The HCI commands expect MAX_ADVERTISEMENT_SIZE (31)octets,
// even though the actual data length may be shorter.
uint8_t full_data[MAX_ADVERTISEMENT_SIZE] = { 0 };
memcpy(full_data, advertising_data, MIN(sizeof(full_data), advertising_data_len));
hci_check_error(hci_le_set_advertising_data(advertising_data_len, full_data));
memset(full_data, 0, sizeof(full_data));
if (scan_response_data_len > 0) {
memcpy(full_data, scan_response_data, MIN(sizeof(full_data), scan_response_data_len));
hci_check_error(hci_le_set_scan_response_data(scan_response_data_len, full_data));
}
// No duration mechanism is provided for legacy advertising, so we need to do our own.
self->advertising_timeout_msecs = timeout * 1000;
self->advertising_start_ticks = supervisor_ticks_ms64();
// Start advertising.
hci_check_error(hci_le_set_advertising_enable(BT_HCI_LE_ADV_ENABLE));
self->extended_advertising = false;
} // end legacy advertising setup
vm_used_ble = true;
self->now_advertising = true;
return 0;
}
void common_hal_bleio_adapter_start_advertising(bleio_adapter_obj_t *self,
bool connectable, bool anonymous, uint32_t timeout, mp_float_t interval,
mp_buffer_info_t *advertising_data_bufinfo,
mp_buffer_info_t *scan_response_data_bufinfo,
mp_int_t tx_power, const bleio_address_obj_t *directed_to) {
check_enabled(self);
// interval value has already been validated.
check_data_fit(advertising_data_bufinfo->len, connectable);
check_data_fit(scan_response_data_bufinfo->len, connectable);
if (advertising_data_bufinfo->len > MAX_ADVERTISEMENT_SIZE && scan_response_data_bufinfo->len > 0) {
mp_raise_bleio_BluetoothError(MP_ERROR_TEXT("Extended advertisements with scan response not supported."));
}
// Anonymous mode requires a timeout so that we don't continue to broadcast
// the same data while cycling the MAC address -- otherwise, what's the
// point of randomizing the MAC address?
if (timeout == 0 && anonymous) {
timeout = MAX_ANONYMOUS_ADV_TIMEOUT_SECS;
} else {
if (timeout > MAX_LIMITED_DISCOVERABLE_ADV_TIMEOUT_SECS) {
mp_raise_bleio_BluetoothError(MP_ERROR_TEXT("Timeout is too long: Maximum timeout length is %d seconds"),
MAX_LIMITED_DISCOVERABLE_ADV_TIMEOUT_SECS);
}
}
if (tx_power != 0) {
mp_raise_NotImplementedError(MP_ERROR_TEXT("Only tx_power=0 supported"));
}
const uint32_t result = _common_hal_bleio_adapter_start_advertising(
self, connectable, anonymous, timeout, interval,
advertising_data_bufinfo->buf,
advertising_data_bufinfo->len,
scan_response_data_bufinfo->buf,
scan_response_data_bufinfo->len,
tx_power, directed_to);
if (result) {
mp_raise_bleio_BluetoothError(MP_ERROR_TEXT("Already advertising"));
}
self->circuitpython_advertising = false;
}
void common_hal_bleio_adapter_stop_advertising(bleio_adapter_obj_t *self) {
check_enabled(self);
self->now_advertising = false;
self->extended_advertising = false;
self->circuitpython_advertising = false;
int result = hci_le_set_advertising_enable(BT_HCI_LE_ADV_DISABLE);
// OK if we're already stopped. There seems to be an ESP32 HCI bug:
// If advertising is already off, then LE_SET_ADV_ENABLE does not return a response.
if (result != HCI_RESPONSE_TIMEOUT) {
hci_check_error(result);
}
// TODO startup CircuitPython advertising again.
}
// Note that something stopped advertising, such as a connection happening.
// Don't ask the adapter to stop.
void bleio_adapter_advertising_was_stopped(bleio_adapter_obj_t *self) {
self->now_advertising = false;
self->extended_advertising = false;
self->circuitpython_advertising = false;
}
bool common_hal_bleio_adapter_get_advertising(bleio_adapter_obj_t *self) {
check_enabled(self);
return self->now_advertising;
}
bool common_hal_bleio_adapter_get_connected(bleio_adapter_obj_t *self) {
check_enabled(self);
for (size_t i = 0; i < BLEIO_TOTAL_CONNECTION_COUNT; i++) {
bleio_connection_internal_t *connection = &bleio_connections[i];
if (connection->conn_handle != BLE_CONN_HANDLE_INVALID) {
return true;
}
}
return false;
}
mp_obj_t common_hal_bleio_adapter_get_connections(bleio_adapter_obj_t *self) {
check_enabled(self);
if (self->connection_objs != NULL) {
return self->connection_objs;
}
size_t total_connected = 0;
mp_obj_t items[BLEIO_TOTAL_CONNECTION_COUNT];
for (size_t i = 0; i < BLEIO_TOTAL_CONNECTION_COUNT; i++) {
bleio_connection_internal_t *connection = &bleio_connections[i];
if (connection->conn_handle != BLE_CONN_HANDLE_INVALID) {
if (connection->connection_obj == mp_const_none) {
connection->connection_obj = bleio_connection_new_from_internal(connection);
}
items[total_connected] = connection->connection_obj;
total_connected++;
}
}
self->connection_objs = mp_obj_new_tuple(total_connected, items);
return self->connection_objs;
}
void common_hal_bleio_adapter_erase_bonding(bleio_adapter_obj_t *self) {
// TODO
mp_raise_NotImplementedError(NULL);
check_enabled(self);
// FIX bonding_erase_storage();
}
uint16_t bleio_adapter_add_attribute(bleio_adapter_obj_t *adapter, mp_obj_t *attribute) {
check_enabled(adapter);
// The handle is the index of this attribute in the attributes list.
uint16_t handle = (uint16_t)adapter->attributes->len;
mp_obj_list_append(adapter->attributes, attribute);
if (mp_obj_is_type(attribute, &bleio_service_type)) {
adapter->last_added_service_handle = handle;
}
if (mp_obj_is_type(attribute, &bleio_characteristic_type)) {
adapter->last_added_characteristic_handle = handle;
}
return handle;
}
mp_obj_t *bleio_adapter_get_attribute(bleio_adapter_obj_t *adapter, uint16_t handle) {
check_enabled(adapter);
if (handle == 0 || handle >= adapter->attributes->len) {
return mp_const_none;
}
return adapter->attributes->items[handle];
}
uint16_t bleio_adapter_max_attribute_handle(bleio_adapter_obj_t *adapter) {
check_enabled(adapter);
return adapter->attributes->len - 1;
}
void bleio_adapter_gc_collect(bleio_adapter_obj_t *adapter) {
gc_collect_root((void **)adapter, sizeof(bleio_adapter_obj_t) / (sizeof(size_t)));
gc_collect_root((void **)bleio_connections, sizeof(bleio_connections) / (sizeof(size_t)));
}
void bleio_adapter_reset(bleio_adapter_obj_t *adapter) {
if (!common_hal_bleio_adapter_get_enabled(adapter)) {
return;
}
// Adapter will be reset.
common_hal_bleio_adapter_set_enabled(adapter, false);
adapter->connection_objs = NULL;
for (size_t i = 0; i < BLEIO_TOTAL_CONNECTION_COUNT; i++) {
bleio_connection_internal_t *connection = &bleio_connections[i];
// Disconnect all connections with Python state cleanly. Keep any supervisor-only connections.
if (connection->connection_obj != mp_const_none &&
connection->conn_handle != BLE_CONN_HANDLE_INVALID) {
common_hal_bleio_connection_disconnect(connection);
}
connection->connection_obj = mp_const_none;
}
}
void bleio_adapter_background(bleio_adapter_obj_t *adapter) {
if (!common_hal_bleio_adapter_get_enabled(adapter)) {
return;
}
if (adapter->advertising_timeout_msecs > 0 &&
supervisor_ticks_ms64() - adapter->advertising_start_ticks > adapter->advertising_timeout_msecs) {
adapter->advertising_timeout_msecs = 0;
common_hal_bleio_adapter_stop_advertising(adapter);
}
hci_result_t result = hci_poll_for_incoming_pkt();
if (result != HCI_OK) {
mp_printf(&mp_plat_print, "bad hci_poll_for_incoming_pkt() result in background: %d\n", result);
}
}
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