blob: 5832f10b8dba2e648bbfeedbe817030853f858b1 [file] [log] [blame]
/*
* Copyright (c) 2016 Nordic Semiconductor ASA
* Copyright (c) 2015-2016 Intel Corporation
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <errno.h>
#include <stddef.h>
#include <stdio.h>
#include <string.h>
#include <zephyr/kernel.h>
#include <zephyr/arch/cpu.h>
#include <zephyr/sys/byteorder.h>
#include <zephyr/logging/log.h>
#include <zephyr/sys/util.h>
#include <zephyr/device.h>
#include <zephyr/init.h>
#include <zephyr/drivers/uart.h>
#include <zephyr/usb/usb_device.h>
#include <zephyr/net/buf.h>
#include <zephyr/bluetooth/bluetooth.h>
#include <zephyr/bluetooth/l2cap.h>
#include <zephyr/bluetooth/hci.h>
#include <zephyr/bluetooth/buf.h>
#include <zephyr/bluetooth/hci_raw.h>
#define LOG_MODULE_NAME hci_uart
LOG_MODULE_REGISTER(LOG_MODULE_NAME);
static const struct device *const hci_uart_dev =
DEVICE_DT_GET(DT_CHOSEN(zephyr_bt_c2h_uart));
static K_THREAD_STACK_DEFINE(tx_thread_stack, CONFIG_BT_HCI_TX_STACK_SIZE);
static struct k_thread tx_thread_data;
static K_FIFO_DEFINE(tx_queue);
/* RX in terms of bluetooth communication */
static K_FIFO_DEFINE(uart_tx_queue);
#define H4_CMD 0x01
#define H4_ACL 0x02
#define H4_SCO 0x03
#define H4_EVT 0x04
#define H4_ISO 0x05
/* Receiver states. */
#define ST_IDLE 0 /* Waiting for packet type. */
#define ST_HDR 1 /* Receiving packet header. */
#define ST_PAYLOAD 2 /* Receiving packet payload. */
#define ST_DISCARD 3 /* Dropping packet. */
/* Length of a discard/flush buffer.
* This is sized to align with a BLE HCI packet:
* 1 byte H:4 header + 32 bytes ACL/event data
* Bigger values might overflow the stack since this is declared as a local
* variable, smaller ones will force the caller to call into discard more
* often.
*/
#define H4_DISCARD_LEN 33
static int h4_read(const struct device *uart, uint8_t *buf, size_t len)
{
int rx = uart_fifo_read(uart, buf, len);
LOG_DBG("read %d req %d", rx, len);
return rx;
}
static bool valid_type(uint8_t type)
{
return (type == H4_CMD) | (type == H4_ACL) | (type == H4_ISO);
}
/* Function expects that type is validated and only CMD, ISO or ACL will be used. */
static uint32_t get_len(const uint8_t *hdr_buf, uint8_t type)
{
switch (type) {
case H4_CMD:
return ((const struct bt_hci_cmd_hdr *)hdr_buf)->param_len;
case H4_ISO:
return bt_iso_hdr_len(
sys_le16_to_cpu(((const struct bt_hci_iso_hdr *)hdr_buf)->len));
case H4_ACL:
return sys_le16_to_cpu(((const struct bt_hci_acl_hdr *)hdr_buf)->len);
default:
LOG_ERR("Invalid type: %u", type);
return 0;
}
}
/* Function expects that type is validated and only CMD, ISO or ACL will be used. */
static int hdr_len(uint8_t type)
{
switch (type) {
case H4_CMD:
return sizeof(struct bt_hci_cmd_hdr);
case H4_ISO:
return sizeof(struct bt_hci_iso_hdr);
case H4_ACL:
return sizeof(struct bt_hci_acl_hdr);
default:
LOG_ERR("Invalid type: %u", type);
return 0;
}
}
static void rx_isr(void)
{
static struct net_buf *buf;
static int remaining;
static uint8_t state;
static uint8_t type;
static uint8_t hdr_buf[MAX(sizeof(struct bt_hci_cmd_hdr),
sizeof(struct bt_hci_acl_hdr))];
int read;
do {
switch (state) {
case ST_IDLE:
/* Get packet type */
read = h4_read(hci_uart_dev, &type, sizeof(type));
/* since we read in loop until no data is in the fifo,
* it is possible that read = 0.
*/
if (read) {
if (valid_type(type)) {
/* Get expected header size and switch
* to receiving header.
*/
remaining = hdr_len(type);
state = ST_HDR;
} else {
LOG_WRN("Unknown header %d", type);
}
}
break;
case ST_HDR:
read = h4_read(hci_uart_dev,
&hdr_buf[hdr_len(type) - remaining],
remaining);
remaining -= read;
if (remaining == 0) {
/* Header received. Allocate buffer and get
* payload length. If allocation fails leave
* interrupt. On failed allocation state machine
* is reset.
*/
buf = bt_buf_get_tx(BT_BUF_H4, K_NO_WAIT,
&type, sizeof(type));
if (!buf) {
LOG_ERR("No available command buffers!");
state = ST_IDLE;
return;
}
remaining = get_len(hdr_buf, type);
net_buf_add_mem(buf, hdr_buf, hdr_len(type));
if (remaining > net_buf_tailroom(buf)) {
LOG_ERR("Not enough space in buffer");
net_buf_unref(buf);
state = ST_DISCARD;
} else {
state = ST_PAYLOAD;
}
}
break;
case ST_PAYLOAD:
read = h4_read(hci_uart_dev, net_buf_tail(buf),
remaining);
buf->len += read;
remaining -= read;
if (remaining == 0) {
/* Packet received */
LOG_DBG("putting RX packet in queue.");
net_buf_put(&tx_queue, buf);
state = ST_IDLE;
}
break;
case ST_DISCARD:
{
uint8_t discard[H4_DISCARD_LEN];
size_t to_read = MIN(remaining, sizeof(discard));
read = h4_read(hci_uart_dev, discard, to_read);
remaining -= read;
if (remaining == 0) {
state = ST_IDLE;
}
break;
}
default:
read = 0;
__ASSERT_NO_MSG(0);
break;
}
} while (read);
}
static void tx_isr(void)
{
static struct net_buf *buf;
int len;
if (!buf) {
buf = net_buf_get(&uart_tx_queue, K_NO_WAIT);
if (!buf) {
uart_irq_tx_disable(hci_uart_dev);
return;
}
}
len = uart_fifo_fill(hci_uart_dev, buf->data, buf->len);
net_buf_pull(buf, len);
if (!buf->len) {
net_buf_unref(buf);
buf = NULL;
}
}
static void bt_uart_isr(const struct device *unused, void *user_data)
{
ARG_UNUSED(unused);
ARG_UNUSED(user_data);
if (!(uart_irq_rx_ready(hci_uart_dev) ||
uart_irq_tx_ready(hci_uart_dev))) {
LOG_DBG("spurious interrupt");
}
if (uart_irq_tx_ready(hci_uart_dev)) {
tx_isr();
}
if (uart_irq_rx_ready(hci_uart_dev)) {
rx_isr();
}
}
static void tx_thread(void *p1, void *p2, void *p3)
{
while (1) {
struct net_buf *buf;
int err;
/* Wait until a buffer is available */
buf = net_buf_get(&tx_queue, K_FOREVER);
/* Pass buffer to the stack */
err = bt_send(buf);
if (err) {
LOG_ERR("Unable to send (err %d)", err);
net_buf_unref(buf);
}
/* Give other threads a chance to run if tx_queue keeps getting
* new data all the time.
*/
k_yield();
}
}
static int h4_send(struct net_buf *buf)
{
LOG_DBG("buf %p type %u len %u", buf, bt_buf_get_type(buf),
buf->len);
net_buf_put(&uart_tx_queue, buf);
uart_irq_tx_enable(hci_uart_dev);
return 0;
}
#if defined(CONFIG_BT_CTLR_ASSERT_HANDLER)
void bt_ctlr_assert_handle(char *file, uint32_t line)
{
uint32_t len = 0U, pos = 0U;
/* Disable interrupts, this is unrecoverable */
(void)irq_lock();
uart_irq_rx_disable(hci_uart_dev);
uart_irq_tx_disable(hci_uart_dev);
if (file) {
while (file[len] != '\0') {
if (file[len] == '/') {
pos = len + 1;
}
len++;
}
file += pos;
len -= pos;
}
uart_poll_out(hci_uart_dev, H4_EVT);
/* Vendor-Specific debug event */
uart_poll_out(hci_uart_dev, 0xff);
/* 0xAA + strlen + \0 + 32-bit line number */
uart_poll_out(hci_uart_dev, 1 + len + 1 + 4);
uart_poll_out(hci_uart_dev, 0xAA);
if (len) {
while (*file != '\0') {
uart_poll_out(hci_uart_dev, *file);
file++;
}
uart_poll_out(hci_uart_dev, 0x00);
}
uart_poll_out(hci_uart_dev, line >> 0 & 0xff);
uart_poll_out(hci_uart_dev, line >> 8 & 0xff);
uart_poll_out(hci_uart_dev, line >> 16 & 0xff);
uart_poll_out(hci_uart_dev, line >> 24 & 0xff);
while (1) {
}
}
#endif /* CONFIG_BT_CTLR_ASSERT_HANDLER */
static int hci_uart_init(void)
{
LOG_DBG("");
if (IS_ENABLED(CONFIG_USB_CDC_ACM)) {
if (usb_enable(NULL)) {
LOG_ERR("Failed to enable USB");
return -EINVAL;
}
}
if (!device_is_ready(hci_uart_dev)) {
LOG_ERR("HCI UART %s is not ready", hci_uart_dev->name);
return -EINVAL;
}
uart_irq_rx_disable(hci_uart_dev);
uart_irq_tx_disable(hci_uart_dev);
uart_irq_callback_set(hci_uart_dev, bt_uart_isr);
uart_irq_rx_enable(hci_uart_dev);
return 0;
}
SYS_INIT(hci_uart_init, APPLICATION, CONFIG_KERNEL_INIT_PRIORITY_DEVICE);
int main(void)
{
/* incoming events and data from the controller */
static K_FIFO_DEFINE(rx_queue);
int err;
LOG_DBG("Start");
__ASSERT(hci_uart_dev, "UART device is NULL");
/* Enable the raw interface, this will in turn open the HCI driver */
bt_enable_raw(&rx_queue);
if (IS_ENABLED(CONFIG_BT_WAIT_NOP)) {
/* Issue a Command Complete with NOP */
int i;
const struct {
const uint8_t h4;
const struct bt_hci_evt_hdr hdr;
const struct bt_hci_evt_cmd_complete cc;
} __packed cc_evt = {
.h4 = H4_EVT,
.hdr = {
.evt = BT_HCI_EVT_CMD_COMPLETE,
.len = sizeof(struct bt_hci_evt_cmd_complete),
},
.cc = {
.ncmd = 1,
.opcode = sys_cpu_to_le16(BT_OP_NOP),
},
};
for (i = 0; i < sizeof(cc_evt); i++) {
uart_poll_out(hci_uart_dev,
*(((const uint8_t *)&cc_evt)+i));
}
}
/* Spawn the TX thread and start feeding commands and data to the
* controller
*/
k_thread_create(&tx_thread_data, tx_thread_stack,
K_THREAD_STACK_SIZEOF(tx_thread_stack), tx_thread,
NULL, NULL, NULL, K_PRIO_COOP(7), 0, K_NO_WAIT);
k_thread_name_set(&tx_thread_data, "HCI uart TX");
while (1) {
struct net_buf *buf;
buf = net_buf_get(&rx_queue, K_FOREVER);
err = h4_send(buf);
if (err) {
LOG_ERR("Failed to send");
}
}
return 0;
}