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Bluetooth: host: Add read antenna information HCI command

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Add Bluetooth 5.1 Direction Finding HCI command:
HCI_LE_Read_Antenna_Information handling to Host.
Add wrapper function to handle send the command
and receive response from Controller.

Signed-off-by: Piotr Pryga <piotr.pryga@nordicsemi.no>
This commit is contained in:
Piotr Pryga 2020-10-14 00:50:47 -07:00 • committed by Carles Cufí
commit 14890c8eb6
4 changed files with 96 additions and 0 deletions
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22
include/bluetooth/hci.h
View file

@ -1351,6 +1351,28 @@ struct bt_hci_cp_le_set_privacy_mode {
uint8_t mode;
} __packed;
#define BT_HCI_LE_1US_AOD_TX BIT(0)
#define BT_HCI_LE_1US_AOD_RX BIT(1)
#define BT_HCI_LE_1US_AOA_RX BIT(2)
#define BT_HCI_LE_NUM_ANT_MIN 0x1
#define BT_HCI_LE_NUM_ANT_MAX 0x4B
#define BT_HCI_LE_MAX_SWITCH_PATTERN_LEN_MIN 0x2
#define BT_HCI_LE_MAX_SWITCH_PATTERN_LEN_MAX 0x4B
#define BT_HCI_LE_MAX_CTE_LEN_MIN 0x2
#define BT_HCI_LE_MAX_CTE_LEN_MAX 0x14
#define BT_HCI_OP_LE_READ_ANT_INFO BT_OP(BT_OGF_LE, 0x0058)
struct bt_hci_rp_le_read_ant_info {
uint8_t status;
uint8_t switch_sample_rates;
uint8_t num_ant;
uint8_t max_switch_pattern_len;
uint8_t max_cte_len;
};
#define BT_HCI_OP_LE_SET_PER_ADV_RECV_ENABLE BT_OP(BT_OGF_LE, 0x0059)
struct bt_hci_cp_le_set_per_adv_recv_enable {
uint16_t handle;

6
subsys/bluetooth/host/CMakeLists.txt
View file

@ -57,6 +57,12 @@ if(CONFIG_BT_HCI_HOST)
)
endif()
endif()
if(CONFIG_BT_DF)
zephyr_library_sources(
direction.c
)
endif()
endif()
if(CONFIG_BT_DEBUG_SMP OR CONFIG_BT_DEBUG_KEYS)

7
subsys/bluetooth/host/Kconfig
View file

@ -601,6 +601,13 @@ config BT_ID_MAX
Maximum number of supported local identity addresses. For most
products this is safe to leave as the default value (1).
config BT_DF
bool "Enable Direction Finding support [EXPERIMENTAL]"
help
Enable support for Bluetooth 5.1 Direction Finding.
It will allow to: get information about antennae, configure
Constant Tone Extension, transmit CTE and sample incoming CTE.
endif # BT_HCI_HOST
config BT_ECC

61
subsys/bluetooth/host/direction.c Normal file
View file

@ -0,0 +1,61 @@
/*
* Copyright (c) 2020 Nordic Semiconductor ASA
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <stdint.h>
#include <assert.h>
#include <bluetooth/hci.h>
#include <sys/byteorder.h>
#define BT_DBG_ENABLED IS_ENABLED(CONFIG_BT_DEBUG_HCI_CORE)
#define LOG_MODULE_NAME bt_df
#include "common/log.h"
/* @brief Function provides information about DF antennae numer and
* controller capabilities related with Constant Tone Extension.
*
* @param[out] switch_sample_rates Optional switching and sampling rates.
* @param[out] num_ant Antennae number.
* @param[out] max_switch_pattern_len Maximum supported antennae switching
* paterns length.
* @param[out] max_CTE_len Maximum length of CTE in 8[us] units.
*
* @return Zero in case of success, other value in case of failure.
*/
static int hci_df_read_ant_info(uint8_t *switch_sample_rates,
uint8_t *num_ant,
uint8_t *max_switch_pattern_len,
uint8_t *max_cte_len)
{
__ASSERT_NO_MSG(switch_sample_rates);
__ASSERT_NO_MSG(num_ant);
__ASSERT_NO_MSG(max_switch_pattern_len);
__ASSERT_NO_MSG(max_cte_len);
struct bt_hci_rp_le_read_ant_info *rp;
struct net_buf *rsp;
int err;
err = bt_hci_cmd_send_sync(BT_HCI_OP_LE_READ_ANT_INFO, NULL, &rsp);
if (err) {
BT_ERR("Failed to read antenna information");
return err;
}
rp = (void *)rsp->data;
BT_DBG("DF: sw. sampl rates: %x ant num: %u , max sw. pattern len: %u,"
"max CTE len %d", rp->switch_sample_rates, rp->num_ant,
rp->max_switch_pattern_len, rp->max_cte_len);
*switch_sample_rates = rp->switch_sample_rates;
*num_ant = rp->num_ant;
*max_switch_pattern_len = rp->max_switch_pattern_len;
*max_cte_len = rp->max_cte_len;
net_buf_unref(rsp);
return 0;
}