static int h4_open(void)
{
BT_DBG("");
uart_irq_rx_disable(h4_dev);
uart_irq_tx_disable(h4_dev);
#if defined(CONFIG_BT_NRF51_PM)
if (nrf51_init(h4_dev) < 0) {
return -EIO;
}
#else
h4_discard(h4_dev, 32);
#endif
uart_irq_callback_set(h4_dev, bt_uart_isr);
k_thread_create(&rx_thread_data, rx_thread_stack,
K_THREAD_STACK_SIZEOF(rx_thread_stack),
rx_thread, NULL, NULL, NULL,
K_PRIO_COOP(CONFIG_BT_RX_PRIO),
0, K_NO_WAIT);
return 0;
}
static inline void process_rx(void)
{
BT_DBG("remaining %u discard %u have_hdr %u rx.buf %p len %u",
rx.remaining, rx.discard, rx.have_hdr, rx.buf,
rx.buf ? rx.buf->len : 0);
if (rx.discard) {
rx.discard -= h4_discard(h4_dev, rx.discard);
return;
}
if (rx.have_hdr) {
read_payload();
} else {
read_header();
}
}
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;
}
}
}