static void bt_uart_isr(struct device *unused)
{
static struct net_buf *buf;
static int remaining;
ARG_UNUSED(unused);
while (uart_irq_update(h4_dev) && uart_irq_is_pending(h4_dev)) {
int read;
if (!uart_irq_rx_ready(h4_dev)) {
if (uart_irq_tx_ready(h4_dev)) {
BT_DBG("transmit ready");
} else {
BT_DBG("spurious interrupt");
}
continue;
}
/* Beginning of a new packet */
if (!remaining) {
uint8_t type;
/* Get packet type */
read = h4_read(h4_dev, &type, sizeof(type), 0);
if (read != sizeof(type)) {
BT_WARN("Unable to read H4 packet type");
continue;
}
switch (type) {
case H4_EVT:
buf = h4_evt_recv(&remaining);
break;
case H4_ACL:
buf = h4_acl_recv(&remaining);
break;
default:
BT_ERR("Unknown H4 type %u", type);
return;
}
BT_DBG("need to get %u bytes", remaining);
if (buf && remaining > net_buf_tailroom(buf)) {
BT_ERR("Not enough space in buffer");
net_buf_unref(buf);
buf = NULL;
}
}
if (!buf) {
read = h4_discard(h4_dev, remaining);
BT_WARN("Discarded %d bytes", read);
remaining -= read;
continue;
}
read = h4_read(h4_dev, net_buf_tail(buf), remaining, 0);
buf->len += read;
remaining -= read;
BT_DBG("received %d bytes", read);
if (!remaining) {
BT_DBG("full packet received");
/* Pass buffer to the stack */
bt_recv(buf);
buf = NULL;
}
}
}
static inline void read_payload(void)
{
struct net_buf *buf;
bool prio;
int read;
if (!rx.buf) {
rx.buf = get_rx(K_NO_WAIT);
if (!rx.buf) {
if (rx.discardable) {
BT_WARN("Discarding event 0x%02x", rx.evt.evt);
rx.discard = rx.remaining;
reset_rx();
return;
}
BT_WARN("Failed to allocate, deferring to rx_thread");
uart_irq_rx_disable(h4_dev);
return;
}
BT_DBG("Allocated rx.buf %p", rx.buf);
if (rx.remaining > net_buf_tailroom(rx.buf)) {
BT_ERR("Not enough space in buffer");
rx.discard = rx.remaining;
reset_rx();
return;
}
copy_hdr(rx.buf);
}
read = uart_fifo_read(h4_dev, net_buf_tail(rx.buf), rx.remaining);
net_buf_add(rx.buf, read);
rx.remaining -= read;
BT_DBG("got %d bytes, remaining %u", read, rx.remaining);
BT_DBG("Payload (len %u): %s", rx.buf->len,
bt_hex(rx.buf->data, rx.buf->len));
if (rx.remaining) {
return;
}
prio = (rx.type == H4_EVT && bt_hci_evt_is_prio(rx.evt.evt));
buf = rx.buf;
rx.buf = NULL;
if (rx.type == H4_EVT) {
bt_buf_set_type(buf, BT_BUF_EVT);
} else {
bt_buf_set_type(buf, BT_BUF_ACL_IN);
}
reset_rx();
if (prio) {
BT_DBG("Calling bt_recv_prio(%p)", buf);
bt_recv_prio(buf);
} else {
BT_DBG("Putting buf %p to rx fifo", buf);
net_buf_put(&rx.fifo, buf);
}
}
