330 lines
12 KiB
C
330 lines
12 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2018 Artur Pacholec
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <string.h>
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#include <stdio.h>
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#include "ble.h"
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#include "ble_drv.h"
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#include "ble_hci.h"
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#include "nrf_soc.h"
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#include "py/objstr.h"
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#include "py/runtime.h"
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#include "shared-bindings/bleio/Adapter.h"
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#include "shared-bindings/bleio/Characteristic.h"
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#include "shared-bindings/bleio/LocalPeripheral.h"
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#include "shared-bindings/bleio/Service.h"
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#include "shared-bindings/bleio/UUID.h"
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#define BLE_MIN_CONN_INTERVAL MSEC_TO_UNITS(15, UNIT_0_625_MS)
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#define BLE_MAX_CONN_INTERVAL MSEC_TO_UNITS(300, UNIT_0_625_MS)
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#define BLE_SLAVE_LATENCY 0
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#define BLE_CONN_SUP_TIMEOUT MSEC_TO_UNITS(4000, UNIT_10_MS)
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#define BLE_ADV_LENGTH_FIELD_SIZE 1
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#define BLE_ADV_AD_TYPE_FIELD_SIZE 1
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#define BLE_AD_TYPE_FLAGS_DATA_SIZE 1
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static uint8_t m_adv_handle = BLE_GAP_ADV_SET_HANDLE_NOT_SET;
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STATIC void check_data_fit(size_t pos, size_t data_len) {
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if (pos + data_len >= BLE_GAP_ADV_SET_DATA_SIZE_MAX) {
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mp_raise_ValueError(translate("Data too large for advertisement packet"));
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}
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}
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STATIC uint32_t add_services_to_advertisement(bleio_local_peripheral_obj_t *self, size_t* adv_data_pos_p, size_t uuid_len) {
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uint32_t uuids_total_size = 0;
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const mp_obj_list_t *service_list = MP_OBJ_TO_PTR(self->service_list);
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uint32_t err_code = NRF_SUCCESS;
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check_data_fit(*adv_data_pos_p, 1 + 1);
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// Remember where length byte is; fill in later when we know the size.
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const size_t length_pos = *adv_data_pos_p;
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(*adv_data_pos_p)++;
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self->adv_data[(*adv_data_pos_p)++] = (uuid_len == 16)
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? BLE_GAP_AD_TYPE_16BIT_SERVICE_UUID_COMPLETE
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: BLE_GAP_AD_TYPE_128BIT_SERVICE_UUID_COMPLETE;
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for (size_t i = 0; i < service_list->len; ++i) {
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const bleio_service_obj_t *service = MP_OBJ_TO_PTR(service_list->items[i]);
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uint8_t encoded_size = 0;
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// Skip services of the wrong length and secondary services.
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if (common_hal_bleio_uuid_get_size(service->uuid) != uuid_len || service->is_secondary) {
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continue;
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}
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ble_uuid_t uuid;
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bleio_uuid_convert_to_nrf_ble_uuid(service->uuid, &uuid);
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err_code = sd_ble_uuid_encode(&uuid, &encoded_size, &(self->adv_data[*adv_data_pos_p]));
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if (err_code != NRF_SUCCESS) {
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return err_code;
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}
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check_data_fit(*adv_data_pos_p, encoded_size);
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uuids_total_size += encoded_size;
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(*adv_data_pos_p) += encoded_size;
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}
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self->adv_data[length_pos] = 1 + uuids_total_size; // 1 for the field type.
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return err_code;
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}
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STATIC uint32_t set_advertisement_data(bleio_local_peripheral_obj_t *self, bool connectable, mp_buffer_info_t *raw_data) {
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common_hal_bleio_adapter_set_enabled(true);
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size_t adv_data_pos = 0;
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uint32_t err_code;
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GET_STR_DATA_LEN(self->name, name_data, name_len);
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if (name_len > 0) {
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ble_gap_conn_sec_mode_t sec_mode;
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BLE_GAP_CONN_SEC_MODE_SET_OPEN(&sec_mode);
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// We'll add the name after everything else, shortening it if necessary.
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err_code = sd_ble_gap_device_name_set(&sec_mode, name_data, name_len);
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if (err_code != NRF_SUCCESS) {
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return err_code;
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}
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}
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if (raw_data->len != 0) {
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// User-supplied advertising packet.
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check_data_fit(adv_data_pos, raw_data->len);
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memcpy(&(self->adv_data[adv_data_pos]), raw_data->buf, raw_data->len);
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adv_data_pos += raw_data->len;
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} else {
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// Build up advertising packet.
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check_data_fit(adv_data_pos, 1 + 1 + 1);
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self->adv_data[adv_data_pos++] = 2;
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self->adv_data[adv_data_pos++] = BLE_GAP_AD_TYPE_FLAGS;
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self->adv_data[adv_data_pos++] = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;
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// The 16-bit ids and 128-bit ids are grouped together by length, so find it whether we have
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// 16 and/or 128-bit service UUIDs.
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const mp_obj_list_t *service_list = MP_OBJ_TO_PTR(self->service_list);
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if (service_list->len > 0) {
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bool has_128bit_services = false;
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bool has_16bit_services = false;
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for (size_t i = 0; i < service_list->len; ++i) {
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const bleio_service_obj_t *service = MP_OBJ_TO_PTR(service_list->items[i]);
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if (service->is_secondary) {
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continue;
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}
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switch (common_hal_bleio_uuid_get_size(service->uuid)) {
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case 16:
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has_16bit_services = true;
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break;
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case 128:
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has_128bit_services = true;
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break;
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}
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}
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// Add 16-bit service UUID's in a group, then 128-bit service UUID's.
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if (has_16bit_services) {
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err_code = add_services_to_advertisement(self, &adv_data_pos, 16);
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if (err_code != NRF_SUCCESS) {
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return err_code;
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}
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}
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if (has_128bit_services) {
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err_code = add_services_to_advertisement(self, &adv_data_pos, 128);
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if (err_code != NRF_SUCCESS) {
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return err_code;
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}
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}
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}
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// Always include TX power.
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check_data_fit(adv_data_pos, 1 + 1 + 1);
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self->adv_data[adv_data_pos++] = 1 + 1;
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self->adv_data[adv_data_pos++] = BLE_GAP_AD_TYPE_TX_POWER_LEVEL;
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self->adv_data[adv_data_pos++] = 0; // TODO - allow power level to be set later.
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// We need room for at least a one-character name.
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check_data_fit(adv_data_pos, 1 + 1 + 1);
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// How big a name can we fit?
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size_t bytes_left = BLE_GAP_ADV_SET_DATA_SIZE_MAX - adv_data_pos - 1 - 1;
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size_t partial_name_len = MIN(bytes_left, name_len);
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self->adv_data[adv_data_pos++] = 1 + partial_name_len;
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self->adv_data[adv_data_pos++] = (partial_name_len == name_len)
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? BLE_GAP_AD_TYPE_COMPLETE_LOCAL_NAME
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: BLE_GAP_AD_TYPE_SHORT_LOCAL_NAME;
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memcpy(&(self->adv_data[adv_data_pos]), name_data, partial_name_len);
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adv_data_pos += partial_name_len;
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} // end of advertising packet construction
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static ble_gap_adv_params_t m_adv_params = {
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.interval = MSEC_TO_UNITS(1000, UNIT_0_625_MS),
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.properties.type = BLE_GAP_ADV_TYPE_CONNECTABLE_SCANNABLE_UNDIRECTED,
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.duration = BLE_GAP_ADV_TIMEOUT_GENERAL_UNLIMITED,
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.filter_policy = BLE_GAP_ADV_FP_ANY,
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.primary_phy = BLE_GAP_PHY_1MBPS,
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};
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if (!connectable) {
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m_adv_params.properties.type = BLE_GAP_ADV_TYPE_NONCONNECTABLE_NONSCANNABLE_UNDIRECTED;
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}
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common_hal_bleio_local_peripheral_stop_advertising(self);
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const ble_gap_adv_data_t ble_gap_adv_data = {
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.adv_data.p_data = self->adv_data,
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.adv_data.len = adv_data_pos,
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};
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err_code = sd_ble_gap_adv_set_configure(&m_adv_handle, &ble_gap_adv_data, &m_adv_params);
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if (err_code != NRF_SUCCESS) {
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return err_code;
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}
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err_code = sd_ble_gap_adv_start(m_adv_handle, BLE_CONN_CFG_TAG_CUSTOM);
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return err_code;
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}
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STATIC void on_ble_evt(ble_evt_t *ble_evt, void *self_in) {
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bleio_local_peripheral_obj_t *self = (bleio_local_peripheral_obj_t*)self_in;
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switch (ble_evt->header.evt_id) {
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case BLE_GAP_EVT_CONNECTED: {
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// Central has connected.
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ble_gap_conn_params_t conn_params;
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self->conn_handle = ble_evt->evt.gap_evt.conn_handle;
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sd_ble_gap_ppcp_get(&conn_params);
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sd_ble_gap_conn_param_update(ble_evt->evt.gap_evt.conn_handle, &conn_params);
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break;
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}
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case BLE_GAP_EVT_DISCONNECTED:
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// Central has disconnected.
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self->conn_handle = BLE_CONN_HANDLE_INVALID;
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break;
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case BLE_GAP_EVT_PHY_UPDATE_REQUEST: {
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ble_gap_phys_t const phys = {
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.rx_phys = BLE_GAP_PHY_AUTO,
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.tx_phys = BLE_GAP_PHY_AUTO,
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};
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sd_ble_gap_phy_update(ble_evt->evt.gap_evt.conn_handle, &phys);
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break;
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}
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case BLE_GAP_EVT_ADV_SET_TERMINATED:
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// Someday may handle timeouts or limit reached.
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break;
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case BLE_GAP_EVT_SEC_PARAMS_REQUEST:
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sd_ble_gap_sec_params_reply(self->conn_handle, BLE_GAP_SEC_STATUS_PAIRING_NOT_SUPP, NULL, NULL);
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break;
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case BLE_GAP_EVT_CONN_PARAM_UPDATE_REQUEST: {
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ble_gap_evt_conn_param_update_request_t *request = &ble_evt->evt.gap_evt.params.conn_param_update_request;
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sd_ble_gap_conn_param_update(self->conn_handle, &request->conn_params);
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break;
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}
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case BLE_GATTS_EVT_EXCHANGE_MTU_REQUEST: {
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sd_ble_gatts_exchange_mtu_reply(self->conn_handle, BLE_GATT_ATT_MTU_DEFAULT);
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break;
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}
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}
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}
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void common_hal_bleio_local_peripheral_construct(bleio_local_peripheral_obj_t *self) {
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common_hal_bleio_adapter_set_enabled(true); // TODO -- Do this somewhere else maybe bleio __init__
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self->gatt_role = GATT_ROLE_NONE;
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self->conn_handle = BLE_CONN_HANDLE_INVALID;
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// Add all the services.
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mp_obj_list_t *service_list = MP_OBJ_TO_PTR(self->service_list);
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for (size_t service_idx = 0; service_idx < service_list->len; ++service_idx) {
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bleio_service_obj_t *service = MP_OBJ_TO_PTR(service_list->items[service_idx]);
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ble_uuid_t uuid;
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bleio_uuid_convert_to_nrf_ble_uuid(service->uuid, &uuid);
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uint8_t service_type = BLE_GATTS_SRVC_TYPE_PRIMARY;
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if (service->is_secondary) {
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service_type = BLE_GATTS_SRVC_TYPE_SECONDARY;
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}
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const uint32_t err_code = sd_ble_gatts_service_add(service_type, &uuid, &service->handle);
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if (err_code != NRF_SUCCESS) {
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mp_raise_OSError_msg_varg(translate("Failed to add service, err 0x%04x"), err_code);
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}
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// Once the service has been registered, its characteristics can be added.
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common_hal_bleio_service_add_all_characteristics(service);
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}
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}
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bool common_hal_bleio_local_peripheral_get_connected(bleio_local_peripheral_obj_t *self) {
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return self->conn_handle != BLE_CONN_HANDLE_INVALID;
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}
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void common_hal_bleio_local_peripheral_start_advertising(bleio_local_peripheral_obj_t *self, bool connectable, mp_buffer_info_t *raw_data) {
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if (connectable) {
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ble_drv_add_event_handler(on_ble_evt, self);
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}
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const uint32_t err_code = set_advertisement_data(self, connectable, raw_data);
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if (err_code != NRF_SUCCESS) {
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mp_raise_OSError_msg_varg(translate("Failed to start advertising, err 0x%04x"), err_code);
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}
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}
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void common_hal_bleio_local_peripheral_stop_advertising(bleio_local_peripheral_obj_t *self) {
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if (m_adv_handle == BLE_GAP_ADV_SET_HANDLE_NOT_SET)
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return;
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const uint32_t err_code = sd_ble_gap_adv_stop(m_adv_handle);
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if ((err_code != NRF_SUCCESS) && (err_code != NRF_ERROR_INVALID_STATE)) {
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mp_raise_OSError_msg_varg(translate("Failed to stop advertising, err 0x%04x"), err_code);
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}
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}
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