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driver: esp32: add bluetooth support

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Add support to BLE and BR/EDR feature.

Signed-off-by: Sylvio Alves <sylvio.alves@espressif.com>
This commit is contained in:
Sylvio Alves 2021-04-01 00:51:49 -03:00 • committed by Anas Nashif
commit a3c35c93ff
8 changed files with 389 additions and 6 deletions
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17
boards/xtensa/esp32/Kconfig.defconfig
View file

@ -16,3 +16,20 @@ config LOG_DETECT_MISSED_STRDUP
default n
endif
if BT
config HEAP_MEM_POOL_SIZE
default 16384
config ENTROPY_GENERATOR
default y
config DYNAMIC_INTERRUPTS
default y
choice BT_HCI_BUS_TYPE
default BT_ESP32
endchoice
endif # BT

1
drivers/bluetooth/hci/CMakeLists.txt
View file

@ -7,3 +7,4 @@ zephyr_sources_ifdef(CONFIG_BT_RPMSG rpmsg.c)
zephyr_sources_ifdef(CONFIG_BT_RPMSG_NRF53 rpmsg_nrf53.c)
zephyr_sources_ifdef(CONFIG_BT_STM32_IPM ipm_stm32wb.c)
zephyr_sources_ifdef(CONFIG_BT_USERCHAN userchan.c)
zephyr_sources_ifdef(CONFIG_BT_ESP32 hci_esp32.c)

7
drivers/bluetooth/hci/Kconfig
View file

@ -63,6 +63,11 @@ config BT_USERCHAN
The Bluetooth adapter must be powered off in order for Zephyr to
be able to use it.
config BT_ESP32
bool "ESP32 HCI driver"
help
Espressif HCI bluetooth interface
config BT_NO_DRIVER
bool "No default HCI driver"
help
@ -128,7 +133,7 @@ endif # BT_RPMSG_NRF53
config BT_DRIVER_QUIRK_NO_AUTO_DLE
bool "Host auto-initiated Data Length Update quirk"
depends on BT_AUTO_DATA_LEN_UPDATE
default y if BT_RPMSG_NRF53
default y if BT_RPMSG_NRF53 || BT_ESP32
help
Enable the quirk wherein BT Host stack will auto-initiate Data Length
Update procedure for new connections for controllers that do not

313
drivers/bluetooth/hci/hci_esp32.c Normal file
View file

@ -0,0 +1,313 @@
/*
* Copyright (c) 2021 Espressif Systems (Shanghai) Co., Ltd.
*
* SPDX-License-Identifier: Apache-2.0
*/
#define LOG_MODULE_NAME bt_hci_driver_esp32
#include "common/log.h"
#include <init.h>
#include <sys/byteorder.h>
#include <drivers/bluetooth/hci_driver.h>
#include <esp_bt.h>
#define HCI_CMD 0x01
#define HCI_ACL 0x02
#define HCI_SCO 0x03
#define HCI_EVT 0x04
#define HCI_ISO 0x05
#define HCI_BT_ESP32_TIMEOUT K_MSEC(2000)
static K_SEM_DEFINE(hci_send_sem, 1, 1);
static bool is_hci_event_discardable(const uint8_t *evt_data)
{
uint8_t evt_type = evt_data[0];
switch (evt_type) {
#if defined(CONFIG_BT_BREDR)
case BT_HCI_EVT_INQUIRY_RESULT_WITH_RSSI:
case BT_HCI_EVT_EXTENDED_INQUIRY_RESULT:
return true;
#endif
case BT_HCI_EVT_LE_META_EVENT: {
uint8_t subevt_type = evt_data[sizeof(struct bt_hci_evt_hdr)];
switch (subevt_type) {
case BT_HCI_EVT_LE_ADVERTISING_REPORT:
return true;
case BT_HCI_EVT_LE_EXT_ADVERTISING_REPORT:
return true;
default:
return false;
}
}
default:
return false;
}
}
static struct net_buf *bt_esp_evt_recv(uint8_t *data, size_t remaining)
{
bool discardable = false;
struct bt_hci_evt_hdr hdr;
struct net_buf *buf;
if (remaining < sizeof(hdr)) {
BT_ERR("Not enough data for event header");
return NULL;
}
discardable = is_hci_event_discardable(data);
memcpy((void *)&hdr, data, sizeof(hdr));
data += sizeof(hdr);
remaining -= sizeof(hdr);
if (remaining != hdr.len) {
BT_ERR("Event payload length is not correct");
return NULL;
}
BT_DBG("len %u", hdr.len);
buf = bt_buf_get_evt(hdr.evt, discardable, K_NO_WAIT);
if (!buf) {
if (discardable) {
BT_DBG("Discardable buffer pool full, ignoring event");
} else {
BT_ERR("No available event buffers!");
}
return buf;
}
net_buf_add_mem(buf, &hdr, sizeof(hdr));
net_buf_add_mem(buf, data, remaining);
return buf;
}
static struct net_buf *bt_esp_acl_recv(uint8_t *data, size_t remaining)
{
struct bt_hci_acl_hdr hdr;
struct net_buf *buf;
if (remaining < sizeof(hdr)) {
BT_ERR("Not enough data for ACL header");
return NULL;
}
buf = bt_buf_get_rx(BT_BUF_ACL_IN, K_NO_WAIT);
if (buf) {
memcpy((void *)&hdr, data, sizeof(hdr));
data += sizeof(hdr);
remaining -= sizeof(hdr);
net_buf_add_mem(buf, &hdr, sizeof(hdr));
} else {
BT_ERR("No available ACL buffers!");
return NULL;
}
if (remaining != sys_le16_to_cpu(hdr.len)) {
BT_ERR("ACL payload length is not correct");
net_buf_unref(buf);
return NULL;
}
BT_DBG("len %u", remaining);
net_buf_add_mem(buf, data, remaining);
return buf;
}
static struct net_buf *bt_esp_iso_recv(uint8_t *data, size_t remaining)
{
struct bt_hci_iso_hdr hdr;
struct net_buf *buf;
if (remaining < sizeof(hdr)) {
BT_ERR("Not enough data for ISO header");
return NULL;
}
buf = bt_buf_get_rx(BT_BUF_ISO_IN, K_NO_WAIT);
if (buf) {
memcpy((void *)&hdr, data, sizeof(hdr));
data += sizeof(hdr);
remaining -= sizeof(hdr);
net_buf_add_mem(buf, &hdr, sizeof(hdr));
} else {
BT_ERR("No available ISO buffers!");
return NULL;
}
if (remaining != sys_le16_to_cpu(hdr.len)) {
BT_ERR("ISO payload length is not correct");
net_buf_unref(buf);
return NULL;
}
BT_DBG("len %zu", remaining);
net_buf_add_mem(buf, data, remaining);
return buf;
}
static int hci_esp_host_rcv_pkt(uint8_t *data, uint16_t len)
{
uint8_t pkt_indicator;
struct net_buf *buf = NULL;
size_t remaining = len;
BT_HEXDUMP_DBG(data, len, "host packet data:");
pkt_indicator = *data++;
remaining -= sizeof(pkt_indicator);
switch (pkt_indicator) {
case HCI_EVT:
buf = bt_esp_evt_recv(data, remaining);
break;
case HCI_ACL:
buf = bt_esp_acl_recv(data, remaining);
break;
case HCI_SCO:
buf = bt_esp_iso_recv(data, remaining);
break;
default:
BT_ERR("Unknown HCI type %u", pkt_indicator);
return -1;
}
if (buf) {
BT_DBG("Calling bt_recv(%p)", buf);
bt_recv(buf);
}
return 0;
}
static void hci_esp_controller_rcv_pkt_ready(void)
{
k_sem_give(&hci_send_sem);
}
static esp_vhci_host_callback_t vhci_host_cb = {
hci_esp_controller_rcv_pkt_ready,
hci_esp_host_rcv_pkt
};
static int bt_esp32_send(struct net_buf *buf)
{
int err = 0;
uint8_t pkt_indicator;
BT_DBG("buf %p type %u len %u", buf, bt_buf_get_type(buf), buf->len);
switch (bt_buf_get_type(buf)) {
case BT_BUF_ACL_OUT:
pkt_indicator = HCI_ACL;
break;
case BT_BUF_CMD:
pkt_indicator = HCI_CMD;
break;
case BT_BUF_ISO_OUT:
pkt_indicator = HCI_ISO;
break;
default:
BT_ERR("Unknown type %u", bt_buf_get_type(buf));
goto done;
}
net_buf_push_u8(buf, pkt_indicator);
BT_HEXDUMP_DBG(buf->data, buf->len, "Final HCI buffer:");
if (!esp_vhci_host_check_send_available()) {
BT_WARN("Controller not ready to receive packets");
}
if (k_sem_take(&hci_send_sem, HCI_BT_ESP32_TIMEOUT) == 0) {
esp_vhci_host_send_packet(buf->data, buf->len);
} else {
BT_ERR("Send packet timeout error");
err = -ETIMEDOUT;
}
done:
net_buf_unref(buf);
k_sem_give(&hci_send_sem);
return err;
}
static int bt_esp32_ble_init(void)
{
int ret;
esp_bt_controller_config_t bt_cfg = BT_CONTROLLER_INIT_CONFIG_DEFAULT();
#ifdef CONFIG_BT_BREDR
esp_bt_mode_t mode = ESP_BT_MODE_BTDM;
#else
esp_bt_mode_t mode = ESP_BT_MODE_BLE;
#endif
ret = esp_bt_controller_init(&bt_cfg);
if (ret) {
BT_ERR("Bluetooth controller init failed %d", ret);
return ret;
}
ret = esp_bt_controller_enable(mode);
if (ret) {
BT_ERR("Bluetooth controller enable failed: %d", ret);
return ret;
}
esp_vhci_host_register_callback(&vhci_host_cb);
return 0;
}
static int bt_esp32_open(void)
{
int err;
err = bt_esp32_ble_init();
if (err) {
return err;
}
BT_DBG("ESP32 BT started");
return 0;
}
static const struct bt_hci_driver drv = {
.name = "BT ESP32",
.open = bt_esp32_open,
.send = bt_esp32_send,
.bus = BT_HCI_DRIVER_BUS_IPM,
#if defined(CONFIG_BT_DRIVER_QUIRK_NO_AUTO_DLE)
.quirks = BT_QUIRK_NO_AUTO_DLE,
#endif
};
static int bt_esp32_init(const struct device *unused)
{
ARG_UNUSED(unused);
bt_hci_driver_register(&drv);
return 0;
}
SYS_INIT(bt_esp32_init, POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEVICE);

11
soc/xtensa/esp32/Kconfig.soc
View file

@ -7,12 +7,19 @@ config SOC_ESP32
select CLOCK_CONTROL
select CLOCK_CONTROL_ESP32
if SOC_ESP32
config IDF_TARGET_ESP32
bool "ESP32 as target board"
default y
depends on SOC_ESP32
config ESPTOOLPY_FLASHFREQ_80M
bool
default y
depends on SOC_ESP32
config ESP32_BT_RESERVE_DRAM
hex "Bluetooth controller reserved RAM region"
default 0xdb5c if BT
default 0
endif # SOC_ESP32

43
soc/xtensa/esp32/linker.ld
View file

@ -39,9 +39,8 @@ MEMORY
*
* FIXME:
* - Utilize available memory regions to full capacity
* - Reserve memory region for BT controller library from ROM
*/
dram0_0_seg(RW): org = 0x3FFB0000, len = 0x30000
dram0_0_seg(RW): org = 0x3FFB0000 + CONFIG_ESP32_BT_RESERVE_DRAM, len = 0x2c200 - CONFIG_ESP32_BT_RESERVE_DRAM
dram0_1_seg(RW): org = 0x3FFE4350, len = 0x1BCB0
drom0_0_seg(R): org = 0x3F400020, len = 0x400000-0x20
rtc_iram_seg(RWX): org = 0x400C0000, len = 0x2000
@ -206,6 +205,12 @@ _net_buf_pool_list = _esp_net_buf_pool_list;
.dram0.data :
{
_data_start = ABSOLUTE(.);
_btdm_data_start = ABSOLUTE(.);
*libbtdm_app.a:(.data .data.*)
. = ALIGN (4);
_btdm_data_end = ABSOLUTE(.);
*(.data)
*(.data.*)
*(.gnu.linkonce.d.*)
@ -260,6 +265,26 @@ _net_buf_pool_list = _esp_net_buf_pool_list;
. = ALIGN(4);
#endif
#if defined(CONFIG_BT_BREDR)
. = ALIGN(4);
Z_LINK_ITERABLE(bt_l2cap_br_fixed_chan);
. = ALIGN(4);
#endif
#if defined(CONFIG_BT_MESH)
Z_LINK_ITERABLE(bt_mesh_subnet_cb);
Z_LINK_ITERABLE(bt_mesh_app_key_cb);
Z_LINK_ITERABLE(bt_mesh_hb_cb);
#endif
. = ALIGN(4);
Z_LINK_ITERABLE(bt_gatt_service_static);
. = ALIGN(4);
. = ALIGN(4);
Z_LINK_ITERABLE(bt_l2cap_fixed_chan);
. = ALIGN(4);
. = ALIGN(4);
Z_LINK_ITERABLE(shell);
. = ALIGN(4);
@ -363,6 +388,8 @@ __shell_root_cmds_end = __esp_shell_root_cmds_end;
#endif
_iram_text_end = ABSOLUTE(.);
. = ALIGN(4);
_iram_end = ABSOLUTE(.);
} GROUP_LINK_IN(IRAM_REGION)
.flash.text :
@ -396,6 +423,12 @@ __shell_root_cmds_end = __esp_shell_root_cmds_end;
{
. = ALIGN (8);
_bss_start = ABSOLUTE(.);
_btdm_bss_start = ABSOLUTE(.);
*libbtdm_app.a:(.bss .bss.* COMMON)
. = ALIGN (4);
_btdm_bss_end = ABSOLUTE(.);
*(.dynsbss)
*(.sbss)
*(.sbss.*)
@ -414,6 +447,9 @@ __shell_root_cmds_end = __esp_shell_root_cmds_end;
_bss_end = ABSOLUTE(.);
} GROUP_LINK_IN(RAMABLE_REGION)
ASSERT(((_bss_end - ORIGIN(dram0_0_seg)) <= LENGTH(dram0_0_seg)),
"DRAM segment data does not fit.")
SECTION_DATA_PROLOGUE(_NOINIT_SECTION_NAME, (NOLOAD),)
{
. = ALIGN (8);
@ -435,3 +471,6 @@ __shell_root_cmds_end = __esp_shell_root_cmds_end;
}
}
ASSERT(((_iram_end - ORIGIN(iram0_0_seg)) <= LENGTH(iram0_0_seg)),
"IRAM0 segment data does not fit.")

2
subsys/bluetooth/Kconfig
View file

@ -190,7 +190,7 @@ if BT_CONN
config BT_HCI_ACL_FLOW_CONTROL
bool "Controller to Host ACL flow control support"
# Enable if building a Host-only build
default y if !BT_CTLR && !BT_STM32_IPM
default y if !BT_CTLR && !BT_STM32_IPM && !BT_ESP32
# Enable if building a Controller-only build
default y if BT_HCI_RAW
select POLL

1
subsys/bluetooth/host/Kconfig
View file

@ -119,6 +119,7 @@ config BT_HCI_RESERVE
default 1 if BT_SPI
default 1 if BT_STM32_IPM
default 1 if BT_USERCHAN
default 1 if BT_ESP32
# Even if no driver is selected the following default is still
# needed e.g. for unit tests.
default 0