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circuitpython/ports/nrf/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) 2018 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 "ble.h"
#include "ble_drv.h"
#include "bonding.h"
#include "nrfx_power.h"
#include "nrf_nvic.h"
#include "nrf_sdm.h"
#include "py/gc.h"
#include "py/objstr.h"
#include "py/runtime.h"
#include "supervisor/shared/bluetooth/bluetooth.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/nvm/ByteArray.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"
#include "shared-module/os/__init__.h"
#endif
#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)
#ifndef BLEIO_VS_UUID_COUNT
#define BLEIO_VS_UUID_COUNT 75
#endif
#ifndef BLEIO_HVN_TX_QUEUE_SIZE
#define BLEIO_HVN_TX_QUEUE_SIZE 5
#endif
#ifndef BLEIO_CENTRAL_ROLE_COUNT
#define BLEIO_CENTRAL_ROLE_COUNT 4
#endif
#ifndef BLEIO_PERIPH_ROLE_COUNT
#define BLEIO_PERIPH_ROLE_COUNT 4
#endif
#ifndef BLEIO_ATTR_TAB_SIZE
#define BLEIO_ATTR_TAB_SIZE (BLE_GATTS_ATTR_TAB_SIZE_DEFAULT * 5)
#endif
const nvm_bytearray_obj_t common_hal_bleio_nvm_obj = {
.base = {
.type = &nvm_bytearray_type,
},
.start_address = (uint8_t *)CIRCUITPY_BLE_CONFIG_START_ADDR,
.len = CIRCUITPY_BLE_CONFIG_SIZE,
};
STATIC void softdevice_assert_handler(uint32_t id, uint32_t pc, uint32_t info) {
reset_into_safe_mode(SAFE_MODE_SDK_FATAL_ERROR);
}
bleio_connection_internal_t bleio_connections[BLEIO_TOTAL_CONNECTION_COUNT];
// Linker script provided ram start.
extern uint32_t _ram_start;
STATIC uint32_t ble_stack_enable(void) {
nrf_clock_lf_cfg_t clock_config = {
#if BOARD_HAS_32KHZ_XTAL
.source = NRF_CLOCK_LF_SRC_XTAL,
.rc_ctiv = 0,
.rc_temp_ctiv = 0,
.accuracy = NRF_CLOCK_LF_ACCURACY_20_PPM,
#else
.source = NRF_CLOCK_LF_SRC_RC,
.rc_ctiv = 16,
.rc_temp_ctiv = 2,
.accuracy = NRF_CLOCK_LF_ACCURACY_250_PPM,
#endif
};
uint32_t err_code = sd_softdevice_enable(&clock_config, softdevice_assert_handler);
if (err_code != NRF_SUCCESS) {
return err_code;
}
err_code = sd_nvic_EnableIRQ(SD_EVT_IRQn);
if (err_code != NRF_SUCCESS) {
return err_code;
}
// Start with no event handlers, etc.
ble_drv_reset();
// In the future we might move .data and .bss to the other side of the stack and
// dynamically adjust for different memory requirements of the SD based on boot.py
// configuration. But we still need to keep the SPIM3 buffer (if needed) in the first 64kB of RAM.
uint32_t sd_ram_end = SOFTDEVICE_RAM_START_ADDR + SOFTDEVICE_RAM_SIZE;
ble_cfg_t ble_conf;
ble_conf.conn_cfg.conn_cfg_tag = BLE_CONN_CFG_TAG_CUSTOM;
// Each additional connection costs:
// about 3700-4300 bytes when .hvn_tx_queue_size is 1
// about 9000 bytes when .hvn_tx_queue_size is 10
ble_conf.conn_cfg.params.gap_conn_cfg.conn_count = BLEIO_TOTAL_CONNECTION_COUNT;
// Event length here can influence throughput so perhaps make multiple connection profiles
// available.
ble_conf.conn_cfg.params.gap_conn_cfg.event_length = BLE_GAP_EVENT_LENGTH_DEFAULT;
err_code = sd_ble_cfg_set(BLE_CONN_CFG_GAP, &ble_conf, sd_ram_end);
if (err_code != NRF_SUCCESS) {
return err_code;
}
memset(&ble_conf, 0, sizeof(ble_conf));
// adv_set_count must be == 1 for S140. Cannot be increased.
ble_conf.gap_cfg.role_count_cfg.adv_set_count = 1;
// periph_role_count costs 1232 bytes for 2 to 3, then ~1840 for each further increment.
ble_conf.gap_cfg.role_count_cfg.periph_role_count = BLEIO_PERIPH_ROLE_COUNT;
// central_role_count costs 648 bytes for 1 to 2, then ~1250 for each further increment.
ble_conf.gap_cfg.role_count_cfg.central_role_count = BLEIO_CENTRAL_ROLE_COUNT;
// The number of concurrent pairing processes. Takes 392 bytes.
ble_conf.gap_cfg.role_count_cfg.central_sec_count = BLE_GAP_ROLE_COUNT_CENTRAL_SEC_DEFAULT;
err_code = sd_ble_cfg_set(BLE_GAP_CFG_ROLE_COUNT, &ble_conf, sd_ram_end);
if (err_code != NRF_SUCCESS) {
return err_code;
}
memset(&ble_conf, 0, sizeof(ble_conf));
ble_conf.conn_cfg.conn_cfg_tag = BLE_CONN_CFG_TAG_CUSTOM;
// Each increment to hvn_tx_queue_size costs 2064 bytes.
// DevZone recommends not setting this directly, but instead changing gap_conn_cfg.event_length.
// However, we are setting connection extension, so this seems to make sense.
ble_conf.conn_cfg.params.gatts_conn_cfg.hvn_tx_queue_size = BLEIO_HVN_TX_QUEUE_SIZE;
err_code = sd_ble_cfg_set(BLE_CONN_CFG_GATTS, &ble_conf, sd_ram_end);
if (err_code != NRF_SUCCESS) {
return err_code;
}
// Set ATT_MTU so that the maximum MTU we can negotiate is up to the full characteristic size.
memset(&ble_conf, 0, sizeof(ble_conf));
ble_conf.conn_cfg.conn_cfg_tag = BLE_CONN_CFG_TAG_CUSTOM;
ble_conf.conn_cfg.params.gatt_conn_cfg.att_mtu = BLE_GATTS_VAR_ATTR_LEN_MAX;
err_code = sd_ble_cfg_set(BLE_CONN_CFG_GATT, &ble_conf, sd_ram_end);
if (err_code != NRF_SUCCESS) {
return err_code;
}
// Make sure service changed characteristic is on. This lets us prompt a peer to re-discover
// portions of our attribute table.
memset(&ble_conf, 0, sizeof(ble_conf));
ble_conf.gatts_cfg.service_changed.service_changed = 1;
err_code = sd_ble_cfg_set(BLE_GATTS_CFG_SERVICE_CHANGED, &ble_conf, sd_ram_end);
if (err_code != NRF_SUCCESS) {
return err_code;
}
// Increase the GATT Server attribute size to accommodate both the CircuitPython built-in service
// and anything the user does.
memset(&ble_conf, 0, sizeof(ble_conf));
// Each increment to the BLE_GATTS_ATTR_TAB_SIZE_DEFAULT multiplier costs 1408 bytes.
ble_conf.gatts_cfg.attr_tab_size.attr_tab_size = BLEIO_ATTR_TAB_SIZE;
err_code = sd_ble_cfg_set(BLE_GATTS_CFG_ATTR_TAB_SIZE, &ble_conf, sd_ram_end);
if (err_code != NRF_SUCCESS) {
return err_code;
}
// Increase the number of vendor UUIDs supported. Apple uses a complete random number per
// service and characteristic.
memset(&ble_conf, 0, sizeof(ble_conf));
// Each additional vs_uuid_count costs 16 bytes.
ble_conf.common_cfg.vs_uuid_cfg.vs_uuid_count = BLEIO_VS_UUID_COUNT; // Defaults to 10.
err_code = sd_ble_cfg_set(BLE_COMMON_CFG_VS_UUID, &ble_conf, sd_ram_end);
if (err_code != NRF_SUCCESS) {
return err_code;
}
// This sets sd_ram_end to the minimum value needed for the settings set above.
// You can set a breakpoint just after this call and examine sd_ram_end to see
// how much RAM the SD needs with the configuration above.
err_code = sd_ble_enable(&sd_ram_end);
if (err_code != NRF_SUCCESS) {
return err_code;
}
// Turn on connection event extension so we can transmit for a longer period of time as needed.
ble_opt_t opt;
opt.common_opt.conn_evt_ext.enable = true;
err_code = sd_ble_opt_set(BLE_COMMON_OPT_CONN_EVT_EXT, &opt);
if (err_code != NRF_SUCCESS) {
return err_code;
}
ble_gap_conn_params_t gap_conn_params = {
.min_conn_interval = BLE_MIN_CONN_INTERVAL,
.max_conn_interval = BLE_MAX_CONN_INTERVAL,
.slave_latency = BLE_SLAVE_LATENCY,
.conn_sup_timeout = BLE_CONN_SUP_TIMEOUT,
};
err_code = sd_ble_gap_ppcp_set(&gap_conn_params);
if (err_code != NRF_SUCCESS) {
return err_code;
}
err_code = sd_ble_gap_appearance_set(BLE_APPEARANCE_UNKNOWN);
return err_code;
}
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);
// Always queue a background run after a BLE event.
background_callback_add_core(&self->background_callback);
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 CIRCUITPY_VERBOSE_BLE
mp_printf(&mp_plat_print, "disconnected %02x\n", ble_evt->evt.gap_evt.params.disconnected.reason);
#endif
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;
}
default:
// For debugging.
// mp_printf(&mp_plat_print, "Unhandled adapter event: 0x%04x\n", ble_evt->header.evt_id);
return false;
break;
}
return true;
}
STATIC void get_address(bleio_adapter_obj_t *self, ble_gap_addr_t *address) {
check_nrf_error(sd_ble_gap_addr_get(address));
}
char default_ble_name[] = { 'C', 'I', 'R', 'C', 'U', 'I', 'T', 'P', 'Y', 0, 0, 0, 0, 0};
STATIC void bleio_adapter_reset_name(bleio_adapter_obj_t *self) {
// setup the default name
ble_gap_addr_t addr; // local_address
get_address(self, &addr);
mp_int_t len = sizeof(default_ble_name) - 1;
default_ble_name[len - 4] = nibble_to_hex_lower[addr.addr[1] >> 4 & 0xf];
default_ble_name[len - 3] = nibble_to_hex_lower[addr.addr[1] & 0xf];
default_ble_name[len - 2] = nibble_to_hex_lower[addr.addr[0] >> 4 & 0xf];
default_ble_name[len - 1] = nibble_to_hex_lower[addr.addr[0] & 0xf];
default_ble_name[len] = '\0'; // for now we add null for compatibility with C ASCIIZ strings
#if CIRCUITPY_OS_GETENV
char ble_name[32];
os_getenv_err_t result = common_hal_os_getenv_str("CIRCUITPY_BLE_NAME", ble_name, sizeof(ble_name));
if (result == GETENV_OK) {
common_hal_bleio_adapter_set_name(self, ble_name);
return;
}
#endif
common_hal_bleio_adapter_set_name(self, (char *)default_ble_name);
}
static void bluetooth_adapter_background(void *data) {
supervisor_bluetooth_background();
bleio_background();
}
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;
}
uint32_t err_code = NRF_SUCCESS;
if (enabled) {
// The SD takes over the POWER module and will fail if the module is already in use.
// Occurs when USB is initialized previously
nrfx_power_uninit();
err_code = ble_stack_enable();
} else {
err_code = sd_softdevice_disable();
}
#if CIRCUITPY_USB
// Re-init USB hardware
init_usb_hardware();
#endif
check_nrf_error(err_code);
// Add a handler for incoming peripheral connections.
if (enabled) {
for (size_t i = 0; i < BLEIO_TOTAL_CONNECTION_COUNT; i++) {
bleio_connection_internal_t *connection = &bleio_connections[i];
// Reset connection.
bleio_connection_clear(connection);
ble_drv_remove_event_handler(connection_on_ble_evt, connection);
connection->conn_handle = BLE_CONN_HANDLE_INVALID;
}
self->background_callback.fun = bluetooth_adapter_background;
self->background_callback.data = self;
bleio_adapter_reset_name(self);
ble_drv_add_event_handler_entry(&self->connection_handler_entry, adapter_on_ble_evt, self);
bluetooth_adapter_background(self);
} else {
ble_drv_remove_event_handler(adapter_on_ble_evt, self);
if (self->current_advertising_data != NULL) {
common_hal_bleio_adapter_stop_advertising(self);
}
ble_drv_reset();
self->scan_results = NULL;
self->current_advertising_data = NULL;
self->advertising_data = NULL;
self->scan_response_data = NULL;
}
}
bool common_hal_bleio_adapter_get_enabled(bleio_adapter_obj_t *self) {
uint8_t is_enabled;
check_nrf_error(sd_softdevice_is_enabled(&is_enabled));
return is_enabled;
}
bleio_address_obj_t *common_hal_bleio_adapter_get_address(bleio_adapter_obj_t *self) {
common_hal_bleio_adapter_set_enabled(self, true);
ble_gap_addr_t local_address;
get_address(self, &local_address);
bleio_address_obj_t *address = mp_obj_malloc(bleio_address_obj_t, &bleio_address_type);
common_hal_bleio_address_construct(address, local_address.addr, local_address.addr_type);
return address;
}
bool common_hal_bleio_adapter_set_address(bleio_adapter_obj_t *self, bleio_address_obj_t *address) {
ble_gap_addr_t local_address;
mp_buffer_info_t bufinfo;
if (!mp_get_buffer(address->bytes, &bufinfo, MP_BUFFER_READ)) {
return false;
}
local_address.addr_type = address->type;
memcpy(local_address.addr, bufinfo.buf, NUM_BLEIO_ADDRESS_BYTES);
return sd_ble_gap_addr_set(&local_address) == NRF_SUCCESS;
}
uint16_t bleio_adapter_get_name(char *buf, uint16_t len) {
uint16_t full_len = 0;
sd_ble_gap_device_name_get(NULL, &full_len);
uint32_t err_code = sd_ble_gap_device_name_get((uint8_t *)buf, &len);
if (err_code != NRF_SUCCESS) {
return 0;
}
return full_len;
}
mp_obj_str_t *common_hal_bleio_adapter_get_name(bleio_adapter_obj_t *self) {
uint16_t len = 0;
sd_ble_gap_device_name_get(NULL, &len);
char buf[len];
bleio_adapter_get_name(buf, len);
return mp_obj_new_str(buf, len);
}
void common_hal_bleio_adapter_set_name(bleio_adapter_obj_t *self, const char *name) {
ble_gap_conn_sec_mode_t sec;
sec.lv = 0;
sec.sm = 0;
uint16_t len = strlen(name);
if (len > BLE_GAP_DEVNAME_MAX_LEN) {
len = BLE_GAP_DEVNAME_MAX_LEN;
}
sd_ble_gap_device_name_set(&sec, (const uint8_t *)name, len);
}
STATIC uint32_t _update_identities(bool is_central) {
const ble_gap_id_key_t *keys[BLE_GAP_DEVICE_IDENTITIES_MAX_COUNT];
// TODO: Make sure we don't store more than BLE_GAP_DEVICE_IDENTITIES_MAX_COUNT identities of
// each type. Right now, we'll silently ignore those keys.
size_t len = bonding_load_identities(is_central, keys, BLE_GAP_DEVICE_IDENTITIES_MAX_COUNT);
uint32_t status = NRF_SUCCESS;
if (len > 0) {
status = sd_ble_gap_device_identities_set(
keys,
NULL, // Don't set local IRK because we use our device IRK for private addresses.
len
);
}
return status;
};
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) {
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;
}
// Check to see if advertising is going already.
if (self->current_advertising_data != NULL && self->current_advertising_data == self->advertising_data) {
check_nrf_error(NRF_ERROR_BUSY);
}
// If the current advertising data isn't owned by the adapter then it must be an internal
// advertisement that we should stop.
if (self->current_advertising_data != NULL) {
common_hal_bleio_adapter_stop_advertising(self);
}
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);
// Update the identities of peripheral peers so they can use a private
// resolvable address in their advertisements.
check_nrf_error(_update_identities(true));
ble_drv_add_event_handler(scan_on_ble_evt, self->scan_results);
uint32_t nrf_timeout = SEC_TO_UNITS(timeout, UNIT_10_MS) + 0.5f;
if (nrf_timeout > UINT16_MAX) {
// 0xffff / 100
mp_raise_ValueError(MP_ERROR_TEXT("timeout must be < 655.35 secs"));
}
if (nrf_timeout == 0 && timeout > 0.0f) {
// Make sure converted timeout is > 0 if original timeout is > 0.
mp_raise_ValueError(MP_ERROR_TEXT("non-zero timeout must be > 0.01"));
}
if (nrf_timeout == 0) {
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) + 0.5f,
.timeout = nrf_timeout,
.window = SEC_TO_UNITS(window, UNIT_0_625_MS) + 0.5f,
.scan_phys = BLE_GAP_PHY_1MBPS,
.active = active
};
uint32_t err_code = sd_ble_gap_scan_start(&scan_params, sd_data);
if (err_code != NRF_SUCCESS) {
ble_drv_remove_event_handler(scan_on_ble_evt, self->scan_results);
self->scan_results = NULL;
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) {
if (self->scan_results == NULL) {
return;
}
sd_ble_gap_scan_stop();
shared_module_bleio_scanresults_set_done(self->scan_results, true);
ble_drv_remove_event_handler(scan_on_ble_evt, self->scan_results);
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;
}
STATIC void _convert_address(const bleio_address_obj_t *address, ble_gap_addr_t *sd_address) {
sd_address->addr_type = address->type;
mp_buffer_info_t address_buf_info;
mp_get_buffer_raise(address->bytes, &address_buf_info, MP_BUFFER_READ);
memcpy(sd_address->addr, (uint8_t *)address_buf_info.buf, NUM_BLEIO_ADDRESS_BYTES);
}
mp_obj_t common_hal_bleio_adapter_connect(bleio_adapter_obj_t *self, bleio_address_obj_t *address, mp_float_t timeout) {
ble_gap_addr_t addr;
_convert_address(address, &addr);
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) + 0.5f,
};
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;
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"));
}
// If we have keys, then try and encrypt the connection.
const ble_gap_enc_key_t *encryption_key = bonding_load_peer_encryption_key(true, &addr);
pair_status_t pair_status = PAIR_NOT_PAIRED;
if (encryption_key != NULL) {
err_code = sd_ble_gap_encrypt(conn_handle, &encryption_key->master_id, &encryption_key->enc_info);
pair_status = PAIR_WAITING;
if (err_code != NRF_SUCCESS) {
pair_status = PAIR_NOT_PAIRED;
}
}
// 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) {
connection->is_central = true;
connection->pair_status = pair_status;
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 > BLE_GAP_ADV_SET_DATA_SIZE_EXTENDED_MAX_SUPPORTED ||
(connectable && data_len > BLE_GAP_ADV_SET_DATA_SIZE_EXTENDED_CONNECTABLE_MAX_SUPPORTED)) {
mp_raise_ValueError(MP_ERROR_TEXT("Data too large for advertisement packet"));
}
}
// The nRF SD 6.1.0 can only do one concurrent advertisement so share the advertising handle.
uint8_t adv_handle = BLE_GAP_ADV_SET_HANDLE_NOT_SET;
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_CONNECTED: // Connecting also stops an advertisement.
// Set the tx_power for the connection higher than the advertisement.
sd_ble_gap_tx_power_set(BLE_GAP_TX_POWER_ROLE_CONN, ble_evt->evt.gap_evt.conn_handle, 0);
common_hal_bleio_adapter_stop_advertising(self);
return false;
break;
case BLE_GAP_EVT_ADV_SET_TERMINATED:
common_hal_bleio_adapter_stop_advertising(self);
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) {
if (self->current_advertising_data != NULL && self->current_advertising_data == self->advertising_data) {
return NRF_ERROR_BUSY;
}
// If the current advertising data isn't owned by the adapter then it must be an internal
// advertisement that we should stop.
if (self->current_advertising_data != NULL) {
common_hal_bleio_adapter_stop_advertising(self);
}
uint32_t err_code;
bool extended = advertising_data_len > BLE_GAP_ADV_SET_DATA_SIZE_MAX ||
scan_response_data_len > BLE_GAP_ADV_SET_DATA_SIZE_MAX;
uint8_t adv_type;
ble_gap_addr_t *peer = NULL;
ble_gap_addr_t peer_address;
if (extended) {
if (connectable) {
adv_type = BLE_GAP_ADV_TYPE_EXTENDED_CONNECTABLE_NONSCANNABLE_UNDIRECTED;
} else if (scan_response_data_len > 0) {
adv_type = BLE_GAP_ADV_TYPE_EXTENDED_NONCONNECTABLE_SCANNABLE_UNDIRECTED;
} else {
adv_type = BLE_GAP_ADV_TYPE_EXTENDED_NONCONNECTABLE_NONSCANNABLE_UNDIRECTED;
}
} else if (connectable) {
if (directed_to == NULL) {
adv_type = BLE_GAP_ADV_TYPE_CONNECTABLE_SCANNABLE_UNDIRECTED;
} else if (interval <= 3.5 && timeout <= 1.3) {
adv_type = BLE_GAP_ADV_TYPE_CONNECTABLE_NONSCANNABLE_DIRECTED_HIGH_DUTY_CYCLE;
_convert_address(directed_to, &peer_address);
peer = &peer_address;
} else {
adv_type = BLE_GAP_ADV_TYPE_CONNECTABLE_NONSCANNABLE_DIRECTED;
_convert_address(directed_to, &peer_address);
peer = &peer_address;
}
} else if (scan_response_data_len > 0) {
adv_type = BLE_GAP_ADV_TYPE_NONCONNECTABLE_SCANNABLE_UNDIRECTED;
} else {
adv_type = BLE_GAP_ADV_TYPE_NONCONNECTABLE_NONSCANNABLE_UNDIRECTED;
}
if (anonymous) {
ble_gap_privacy_params_t privacy = {
.privacy_mode = BLE_GAP_PRIVACY_MODE_DEVICE_PRIVACY,
.private_addr_type = BLE_GAP_ADDR_TYPE_RANDOM_PRIVATE_RESOLVABLE,
// Rotate the keys one second after we're scheduled to stop
// advertising. This prevents a potential race condition where we
// fire off a beacon with the same advertising data but a new MAC
// address just as we tear down the connection.
.private_addr_cycle_s = timeout + 1,
.p_device_irk = NULL,
};
err_code = sd_ble_gap_privacy_set(&privacy);
} else {
ble_gap_privacy_params_t privacy = {
.privacy_mode = BLE_GAP_PRIVACY_MODE_OFF,
.private_addr_type = BLE_GAP_ADDR_TYPE_PUBLIC,
.private_addr_cycle_s = 0,
.p_device_irk = NULL,
};
err_code = sd_ble_gap_privacy_set(&privacy);
}
if (err_code != NRF_SUCCESS) {
return err_code;
}
ble_gap_adv_params_t adv_params = {
.interval = SEC_TO_UNITS(interval, UNIT_0_625_MS) + 0.5f,
.properties.type = adv_type,
.duration = SEC_TO_UNITS(timeout, UNIT_10_MS),
.filter_policy = BLE_GAP_ADV_FP_ANY,
.primary_phy = BLE_GAP_PHY_1MBPS,
.p_peer_addr = peer,
};
const ble_gap_adv_data_t ble_gap_adv_data = {
.adv_data.p_data = (uint8_t *)advertising_data,
.adv_data.len = advertising_data_len,
.scan_rsp_data.p_data = scan_response_data_len > 0 ? (uint8_t *)scan_response_data : NULL,
.scan_rsp_data.len = scan_response_data_len,
};
// Update the identities of central peers so they can use a private address
// in the scan and connection initiation.
err_code = _update_identities(false);
if (err_code != NRF_SUCCESS) {
return err_code;
}
err_code = sd_ble_gap_adv_set_configure(&adv_handle, &ble_gap_adv_data, &adv_params);
if (err_code != NRF_SUCCESS) {
return err_code;
}
ble_drv_add_event_handler_entry(&self->advertising_handler_entry, advertising_on_ble_evt, self);
err_code = sd_ble_gap_tx_power_set(BLE_GAP_TX_POWER_ROLE_ADV, adv_handle, tx_power);
if (err_code != NRF_SUCCESS) {
return err_code;
}
err_code = sd_ble_gap_adv_start(adv_handle, BLE_CONN_CFG_TAG_CUSTOM);
if (err_code != NRF_SUCCESS) {
return err_code;
}
self->current_advertising_data = advertising_data;
return NRF_SUCCESS;
}
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) {
if (self->user_advertising) {
mp_raise_bleio_BluetoothError(MP_ERROR_TEXT("Already advertising."));
} else if (self->current_advertising_data != NULL) {
// If the user isn't advertising, then the background is. So, stop the
// background advertising so the user can.
common_hal_bleio_adapter_stop_advertising(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 > 31 && scan_response_data_bufinfo->len > 0) {
mp_raise_bleio_BluetoothError(MP_ERROR_TEXT("Extended advertisements with scan response not supported."));
}
if (advertising_data_bufinfo->len > 0 && directed_to != NULL) {
mp_raise_bleio_BluetoothError(MP_ERROR_TEXT("Data not supported with directed advertising"));
}
// 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) {
if (anonymous) {
// The Nordic macro is in units of 10ms. Convert to seconds.
uint32_t adv_timeout_max_secs = UNITS_TO_SEC(BLE_GAP_ADV_TIMEOUT_LIMITED_MAX, UNIT_10_MS);
uint32_t rotate_timeout_max_secs = BLE_GAP_DEFAULT_PRIVATE_ADDR_CYCLE_INTERVAL_S;
timeout = MIN(adv_timeout_max_secs, rotate_timeout_max_secs);
} else {
timeout = BLE_GAP_ADV_TIMEOUT_GENERAL_UNLIMITED;
}
} else {
if (SEC_TO_UNITS(timeout, UNIT_10_MS) > BLE_GAP_ADV_TIMEOUT_LIMITED_MAX) {
mp_raise_bleio_BluetoothError(MP_ERROR_TEXT("Timeout is too long: Maximum timeout length is %d seconds"),
UNITS_TO_SEC(BLE_GAP_ADV_TIMEOUT_LIMITED_MAX, UNIT_10_MS));
}
}
// The advertising data buffers must not move, because the SoftDevice depends on them.
if (self->advertising_data == NULL) {
self->advertising_data = (uint8_t *)gc_alloc(BLE_GAP_ADV_SET_DATA_SIZE_EXTENDED_MAX_SUPPORTED * sizeof(uint8_t), false);
}
if (self->scan_response_data == NULL) {
self->scan_response_data = (uint8_t *)gc_alloc(BLE_GAP_ADV_SET_DATA_SIZE_EXTENDED_MAX_SUPPORTED * sizeof(uint8_t), false);
}
memcpy(self->advertising_data, advertising_data_bufinfo->buf, advertising_data_bufinfo->len);
memcpy(self->scan_response_data, scan_response_data_bufinfo->buf, scan_response_data_bufinfo->len);
check_nrf_error(_common_hal_bleio_adapter_start_advertising(self, connectable, anonymous, timeout, interval,
self->advertising_data,
advertising_data_bufinfo->len,
self->scan_response_data,
scan_response_data_bufinfo->len,
tx_power,
directed_to));
self->user_advertising = true;
}
void common_hal_bleio_adapter_stop_advertising(bleio_adapter_obj_t *self) {
if (adv_handle == BLE_GAP_ADV_SET_HANDLE_NOT_SET) {
return;
}
const uint32_t err_code = sd_ble_gap_adv_stop(adv_handle);
ble_drv_remove_event_handler(advertising_on_ble_evt, self);
self->current_advertising_data = NULL;
self->user_advertising = false;
if ((err_code != NRF_SUCCESS) && (err_code != NRF_ERROR_INVALID_STATE)) {
check_nrf_error(err_code);
}
}
bool common_hal_bleio_adapter_get_advertising(bleio_adapter_obj_t *self) {
return self->current_advertising_data != NULL;
}
bool common_hal_bleio_adapter_get_connected(bleio_adapter_obj_t *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) {
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) {
bonding_erase_storage();
}
bool common_hal_bleio_adapter_is_bonded_to_central(bleio_adapter_obj_t *self) {
return bonding_peripheral_bond_count() > 0;
}
void bleio_adapter_gc_collect(bleio_adapter_obj_t *adapter) {
// We divide by size_t so that we can scan each 32-bit aligned value to see
// if it is a pointer. This allows us to change the structs without worrying
// about collecting new pointers.
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) {
common_hal_bleio_adapter_stop_scan(adapter);
if (adapter->current_advertising_data != NULL) {
common_hal_bleio_adapter_stop_advertising(adapter);
}
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 cleanly.
if (connection->conn_handle != BLE_CONN_HANDLE_INVALID) {
common_hal_bleio_connection_disconnect(connection);
}
connection->connection_obj = mp_const_none;
}
// Wait up to 125 ms (128 ticks) for disconnect to complete. This should be
// greater than most connection intervals.
bool any_connected = false;
uint64_t start_ticks = supervisor_ticks_ms64();
while (any_connected && supervisor_ticks_ms64() - start_ticks < 128) {
any_connected = false;
for (size_t i = 0; i < BLEIO_TOTAL_CONNECTION_COUNT; i++) {
bleio_connection_internal_t *connection = &bleio_connections[i];
any_connected |= connection->conn_handle != BLE_CONN_HANDLE_INVALID;
}
}
}
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