drivers/ieee802154/ieee802154_nrf5.c - third_party/github/zephyrproject-rtos/zephyr - Git at Google

 /* ieee802154_nrf5.c - nRF5 802.15.4 driver */

 /*
  * Copyright (c) 2017 Nordic Semiconductor ASA
  *
  * SPDX-License-Identifier: Apache-2.0
  */

 #define SYS_LOG_LEVEL CONFIG_SYS_LOG_IEEE802154_DRIVER_LEVEL
 #define SYS_LOG_DOMAIN "dev/nrf5_802154"
 #include <logging/sys_log.h>

 #include <errno.h>

 #include <kernel.h>
 #include <arch/cpu.h>

 #include <board.h>
 #include <device.h>
 #include <init.h>
 #include <net/net_if.h>
 #include <net/net_pkt.h>

 #include <misc/byteorder.h>
 #include <string.h>
 #include <rand32.h>

 #include <net/ieee802154_radio.h>
 #include <drivers/clock_control/nrf5_clock_control.h>
 #include <clock_control.h>

 #include "nrf52840.h"
 #include "ieee802154_nrf5.h"
 #include "nrf_drv_radio802154.h"

 struct nrf5_802154_config {
 	void (*irq_config_func)(struct device *dev);
 };

 static struct nrf5_802154_data nrf5_data;

 /* Convenience defines for RADIO */
 #define NRF5_802154_DATA(dev) \
 	((struct nrf5_802154_data * const)(dev)->driver_data)

 #define NRF5_802154_CFG(dev) \
 	((struct nrf5_802154_config * const)(dev)->config->config_info)

 static void nrf5_get_eui64(u8_t *mac)
 {
 	memcpy(mac, (const u32_t *)&NRF_FICR->DEVICEID, 8);
 }

 static void nrf5_rx_thread(void *arg1, void *arg2, void *arg3)
 {
 	struct device *dev = (struct device *)arg1;
 	struct nrf5_802154_data *nrf5_radio = NRF5_802154_DATA(dev);
 	struct net_buf *frag = NULL;
 	enum net_verdict ack_result;
 	struct net_pkt *pkt;
 	u8_t pkt_len;

 	ARG_UNUSED(arg2);
 	ARG_UNUSED(arg3);

 	while (1) {
 		pkt = NULL;

 		SYS_LOG_DBG("Waiting for frame");
 		k_sem_take(&nrf5_radio->rx_wait, K_FOREVER);

 		SYS_LOG_DBG("Frame received");

 		pkt = net_pkt_get_reserve_rx(0, K_NO_WAIT);
 		if (!pkt) {
 			SYS_LOG_ERR("No pkt available");
 			goto out;
 		}

 #if defined(CONFIG_IEEE802154_NRF5_RAW)
 		/**
 		 * Reserve 1 byte for length
 		 */
 		net_pkt_set_ll_reserve(pkt, 1);
 #endif

 		frag = net_pkt_get_frag(pkt, K_NO_WAIT);
 		if (!frag) {
 			SYS_LOG_ERR("No frag available");
 			goto out;
 		}

 		net_pkt_frag_insert(pkt, frag);

 		/* rx_mpdu contains length, psdu, fcs|lqi
 		 * The last 2 bytes contain LQI or FCS, depending if
 		 * automatic CRC handling is enabled or not, respectively.
 		 */
 #if defined(CONFIG_IEEE802154_NRF5_RAW)
 		pkt_len = nrf5_radio->rx_psdu[0];
 #else
 		pkt_len = nrf5_radio->rx_psdu[0] -  NRF5_FCS_LENGTH;
 #endif

 		/* Skip length (first byte) and copy the payload */
 		memcpy(frag->data, nrf5_radio->rx_psdu + 1, pkt_len);
 		net_buf_add(frag, pkt_len);

 		net_pkt_set_ieee802154_lqi(pkt, nrf5_radio->lqi);
 		net_pkt_set_ieee802154_rssi(pkt, nrf5_radio->rssi);

 		nrf_drv_radio802154_buffer_free(nrf5_radio->rx_psdu);

 		ack_result = ieee802154_radio_handle_ack(nrf5_radio->iface,
 							 pkt);
 		if (ack_result == NET_OK) {
 			SYS_LOG_DBG("ACK packet handled");
 			goto out;
 		}

 		SYS_LOG_DBG("Caught a packet (%u) (LQI: %u)",
 			    pkt_len, nrf5_radio->lqi);

 		if (net_recv_data(nrf5_radio->iface, pkt) < 0) {
 			SYS_LOG_DBG("Packet dropped by NET stack");
 			goto out;
 		}

 		net_analyze_stack("nRF5 rx stack",
 				  K_THREAD_STACK_BUFFER(nrf5_radio->rx_stack),
 				  K_THREAD_STACK_SIZEOF(nrf5_radio->rx_stack));
 		continue;

 out:
 		if (pkt) {
 			net_pkt_unref(pkt);
 		}
 	}
 }

 /* Radio device API */

 static enum ieee802154_hw_caps nrf5_get_capabilities(struct device *dev)
 {
 	return IEEE802154_HW_FCS |
 		IEEE802154_HW_2_4_GHZ |
 		IEEE802154_HW_FILTER;
 }


 static int nrf5_cca(struct device *dev)
 {
 	struct nrf5_802154_data *nrf5_radio = NRF5_802154_DATA(dev);

 	/* Current implementation of the NRF5 radio driver doesn't provide an
 	 * explicit API to perform CCA. However, Mode1 CCA (energy above
 	 * threshold), can be achieved using energy detection function.
 	 */
 	if (!nrf_drv_radio802154_energy_detection(nrf5_radio->channel, 128)) {
 		return -EBUSY;
 	}

 	/* The nRF driver guarantees that a callback will be called once
 	 * the ED function is done, thus unlocking the semaphore.
 	 */
 	k_sem_take(&nrf5_radio->cca_wait, K_FOREVER);
 	SYS_LOG_DBG("CCA: %d", nrf5_radio->channel_ed);

 	if (nrf5_radio->channel_ed > CONFIG_IEEE802154_NRF5_CCA_ED_THRESHOLD) {
 		return -EBUSY;
 	}

 	return 0;
 }

 static int nrf5_set_channel(struct device *dev, u16_t channel)
 {
 	struct nrf5_802154_data *nrf5_radio = NRF5_802154_DATA(dev);

 	SYS_LOG_DBG("%u", channel);

 	if (channel < 11 || channel > 26) {
 		return -EINVAL;
 	}

 	if (!nrf_drv_radio802154_receive(channel, false)) {
 		return -EBUSY;
 	}

 	nrf5_radio->channel = channel;
 	return 0;
 }

 static int nrf5_set_pan_id(struct device *dev, u16_t pan_id)
 {
 	u8_t pan_id_le[2];

 	ARG_UNUSED(dev);

 	sys_put_le16(pan_id, pan_id_le);
 	nrf_drv_radio802154_pan_id_set(pan_id_le);

 	SYS_LOG_DBG("0x%x", pan_id);
 	return 0;
 }

 static int nrf5_set_short_addr(struct device *dev, u16_t short_addr)
 {
 	u8_t short_addr_le[2];

 	ARG_UNUSED(dev);

 	sys_put_le16(short_addr, short_addr_le);
 	nrf_drv_radio802154_short_address_set(short_addr_le);

 	SYS_LOG_DBG("0x%x", short_addr);
 	return 0;
 }

 static int nrf5_set_ieee_addr(struct device *dev, const u8_t *ieee_addr)
 {
 	ARG_UNUSED(dev);

 	SYS_LOG_DBG("IEEE address %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
 		    ieee_addr[7], ieee_addr[6], ieee_addr[5], ieee_addr[4],
 		    ieee_addr[3], ieee_addr[2], ieee_addr[1], ieee_addr[0]);

 	nrf_drv_radio802154_extended_address_set(ieee_addr);

 	return 0;
 }

 static int nrf5_set_filter(struct device *dev,
 			   enum ieee802154_filter_type type,
 			   const struct ieee802154_filter *filter)
 {
 	SYS_LOG_DBG("Applying filter %u", type);

 	if (type == IEEE802154_FILTER_TYPE_IEEE_ADDR) {
 		return nrf5_set_ieee_addr(dev, filter->ieee_addr);
 	} else if (type == IEEE802154_FILTER_TYPE_SHORT_ADDR) {
 		return nrf5_set_short_addr(dev, filter->short_addr);
 	} else if (type == IEEE802154_FILTER_TYPE_PAN_ID) {
 		return nrf5_set_pan_id(dev, filter->pan_id);
 	}

 	return -EINVAL;
 }

 static int nrf5_set_txpower(struct device *dev, s16_t dbm)
 {
 	struct nrf5_802154_data *nrf5_radio = NRF5_802154_DATA(dev);

 	SYS_LOG_DBG("%d", dbm);
 	nrf5_radio->txpower = dbm;

 	return 0;
 }

 static int nrf5_tx(struct device *dev,
 		   struct net_pkt *pkt,
 		   struct net_buf *frag)
 {
 	struct nrf5_802154_data *nrf5_radio = NRF5_802154_DATA(dev);
 	u8_t payload_len = net_pkt_ll_reserve(pkt) + frag->len;
 	u8_t *payload = frag->data - net_pkt_ll_reserve(pkt);

 	SYS_LOG_DBG("%p (%u)", payload, payload_len);

 	nrf5_radio->tx_success = false;
 	nrf5_radio->tx_psdu[0] = payload_len + NRF5_FCS_LENGTH;

 	memcpy(nrf5_radio->tx_psdu + 1, payload, payload_len);

 	if (!nrf_drv_radio802154_transmit(nrf5_radio->tx_psdu,
 					  nrf5_radio->channel,
 					  nrf5_radio->txpower)) {
 		SYS_LOG_ERR("Cannot send frame");
 		return -EIO;
 	}

 	SYS_LOG_DBG("Sending frame (ch:%d, txpower:%d)",
 		    nrf5_radio->channel,
 		    nrf5_radio->txpower);

 	/* The nRF driver guarantees that either
 	 * nrf_drv_radio802154_transmitted() or
 	 * nrf_drv_radio802154_energy_detected()
 	 * callback is called, thus unlocking the semaphore.
 	 */
 	k_sem_take(&nrf5_radio->tx_wait, K_FOREVER);

 	SYS_LOG_DBG("Result: %d", nrf5_data.tx_success);

 	return nrf5_radio->tx_success ? 0 : -EBUSY;
 }

 static int nrf5_start(struct device *dev)
 {
 	struct nrf5_802154_data *nrf5_radio = NRF5_802154_DATA(dev);

 	nrf_drv_radio802154_receive(nrf5_radio->channel, false);
 	SYS_LOG_DBG("nRF5 802154 radio started (channel: %d)",
 		    nrf5_radio->channel);

 	return 0;
 }

 static int nrf5_stop(struct device *dev)
 {
 	ARG_UNUSED(dev);

 	if (!nrf_drv_radio802154_sleep()) {
 		SYS_LOG_ERR("Error while stopping radio");
 		return -EIO;
 	}

 	SYS_LOG_DBG("nRF5 802154 radio stopped");

 	return 0;
 }

 static void nrf5_radio_irq(void *arg)
 {
 	ARG_UNUSED(arg);

 	nrf_drv_radio802154_irq_handler();
 }

 static void nrf5_config(struct device *dev)
 {
 	ARG_UNUSED(dev);

 	IRQ_CONNECT(NRF5_IRQ_RADIO_IRQn, 0, nrf5_radio_irq, NULL, 0);
 	irq_enable(NRF5_IRQ_RADIO_IRQn);
 }

 static int nrf5_init(struct device *dev)
 {
 	const struct nrf5_802154_config *nrf5_radio_cfg = NRF5_802154_CFG(dev);
 	struct nrf5_802154_data *nrf5_radio = NRF5_802154_DATA(dev);
 	struct device *clk_m16;

 	k_sem_init(&nrf5_radio->rx_wait, 0, 1);
 	k_sem_init(&nrf5_radio->tx_wait, 0, 1);
 	k_sem_init(&nrf5_radio->cca_wait, 0, 1);

 	clk_m16 = device_get_binding(CONFIG_CLOCK_CONTROL_NRF5_M16SRC_DRV_NAME);
 	if (!clk_m16) {
 		return -ENODEV;
 	}

 	clock_control_on(clk_m16, NULL);

 	nrf_drv_radio802154_init();

 	nrf5_radio_cfg->irq_config_func(dev);

 	k_thread_create(&nrf5_radio->rx_thread, nrf5_radio->rx_stack,
 			CONFIG_IEEE802154_NRF5_RX_STACK_SIZE,
 			nrf5_rx_thread, dev, NULL, NULL,
 			K_PRIO_COOP(2), 0, 0);

 	SYS_LOG_INF("nRF5 802154 radio initialized");

 	return 0;
 }

 static void nrf5_iface_init(struct net_if *iface)
 {
 	struct device *dev = net_if_get_device(iface);
 	struct nrf5_802154_data *nrf5_radio = NRF5_802154_DATA(dev);

 	SYS_LOG_DBG("");

 	nrf5_get_eui64(nrf5_radio->mac);
 	net_if_set_link_addr(iface,
 			     nrf5_radio->mac,
 			     sizeof(nrf5_radio->mac),
 			     NET_LINK_IEEE802154);

 	nrf5_radio->iface = iface;
 	ieee802154_init(iface);
 }

 /* nRF5 radio driver callbacks */

 void nrf_drv_radio802154_received(u8_t *p_data, s8_t power, s8_t lqi)
 {
 	nrf5_data.rx_psdu = p_data;
 	nrf5_data.rssi = power;
 	nrf5_data.lqi = lqi;

 	k_sem_give(&nrf5_data.rx_wait);
 }

 void nrf_drv_radio802154_transmitted(bool pending_bit)
 {
 	ARG_UNUSED(pending_bit);

 	nrf5_data.tx_success = true;
 	k_sem_give(&nrf5_data.tx_wait);
 }

 void nrf_drv_radio802154_busy_channel(void)
 {
 	k_sem_give(&nrf5_data.tx_wait);
 }

 void nrf_drv_radio802154_energy_detected(s8_t result)
 {
 	nrf5_data.channel_ed = result;
 	k_sem_give(&nrf5_data.cca_wait);
 }

 static const struct nrf5_802154_config nrf5_radio_cfg = {
 	.irq_config_func = nrf5_config,
 };

 static struct ieee802154_radio_api nrf5_radio_api = {
 	.iface_api.init = nrf5_iface_init,
 	.iface_api.send = ieee802154_radio_send,

 	.get_capabilities = nrf5_get_capabilities,
 	.cca = nrf5_cca,
 	.set_channel = nrf5_set_channel,
 	.set_filter = nrf5_set_filter,
 	.set_txpower = nrf5_set_txpower,
 	.start = nrf5_start,
 	.stop = nrf5_stop,
 	.tx = nrf5_tx,
 };

 #if defined(CONFIG_IEEE802154_NRF5_RAW)
 DEVICE_AND_API_INIT(nrf5_154_radio, CONFIG_IEEE802154_NRF5_DRV_NAME,
 		    nrf5_init, &nrf5_data, &nrf5_radio_cfg,
 		    POST_KERNEL, CONFIG_IEEE802154_NRF5_INIT_PRIO,
 		    &nrf5_radio_api);
 #else
 NET_DEVICE_INIT(nrf5_154_radio, CONFIG_IEEE802154_NRF5_DRV_NAME,
 		nrf5_init, &nrf5_data, &nrf5_radio_cfg,
 		CONFIG_IEEE802154_NRF5_INIT_PRIO,
 		&nrf5_radio_api, IEEE802154_L2,
 		NET_L2_GET_CTX_TYPE(IEEE802154_L2), 125);

 NET_STACK_INFO_ADDR(RX, nrf5_154_radio,
 		    CONFIG_IEEE802154_NRF5_RX_STACK_SIZE,
 		    CONFIG_IEEE802154_NRF5_RX_STACK_SIZE,
 		    nrf5_data.rx_stack, 0);
 #endif
	/* ieee802154_nrf5.c - nRF5 802.15.4 driver */

	/*
	* Copyright (c) 2017 Nordic Semiconductor ASA
	*
	* SPDX-License-Identifier: Apache-2.0
	*/

	#define SYS_LOG_LEVEL CONFIG_SYS_LOG_IEEE802154_DRIVER_LEVEL
	#define SYS_LOG_DOMAIN "dev/nrf5_802154"
	#include <logging/sys_log.h>

	#include <errno.h>

	#include <kernel.h>
	#include <arch/cpu.h>

	#include <board.h>
	#include <device.h>
	#include <init.h>
	#include <net/net_if.h>
	#include <net/net_pkt.h>

	#include <misc/byteorder.h>
	#include <string.h>
	#include <rand32.h>

	#include <net/ieee802154_radio.h>
	#include <drivers/clock_control/nrf5_clock_control.h>
	#include <clock_control.h>

	#include "nrf52840.h"
	#include "ieee802154_nrf5.h"
	#include "nrf_drv_radio802154.h"

	struct nrf5_802154_config {
	void (irq_config_func)(struct device dev);
	};

	static struct nrf5_802154_data nrf5_data;

	/* Convenience defines for RADIO */
	#define NRF5_802154_DATA(dev) \
	((struct nrf5_802154_data * const)(dev)->driver_data)

	#define NRF5_802154_CFG(dev) \
	((struct nrf5_802154_config * const)(dev)->config->config_info)

	static void nrf5_get_eui64(u8_t *mac)
	{
	memcpy(mac, (const u32_t *)&NRF_FICR->DEVICEID, 8);
	}

	static void nrf5_rx_thread(void arg1, void arg2, void *arg3)
	{
	struct device dev = (struct device )arg1;
	struct nrf5_802154_data *nrf5_radio = NRF5_802154_DATA(dev);
	struct net_buf *frag = NULL;
	enum net_verdict ack_result;
	struct net_pkt *pkt;
	u8_t pkt_len;

	ARG_UNUSED(arg2);
	ARG_UNUSED(arg3);

	while (1) {
	pkt = NULL;

	SYS_LOG_DBG("Waiting for frame");
	k_sem_take(&nrf5_radio->rx_wait, K_FOREVER);

	SYS_LOG_DBG("Frame received");

	pkt = net_pkt_get_reserve_rx(0, K_NO_WAIT);
	if (!pkt) {
	SYS_LOG_ERR("No pkt available");
	goto out;
	}

	#if defined(CONFIG_IEEE802154_NRF5_RAW)
	/**
	* Reserve 1 byte for length
	*/
	net_pkt_set_ll_reserve(pkt, 1);
	#endif

	frag = net_pkt_get_frag(pkt, K_NO_WAIT);
	if (!frag) {
	SYS_LOG_ERR("No frag available");
	goto out;
	}

	net_pkt_frag_insert(pkt, frag);

	/* rx_mpdu contains length, psdu, fcs\|lqi
	* The last 2 bytes contain LQI or FCS, depending if
	* automatic CRC handling is enabled or not, respectively.
	*/
	#if defined(CONFIG_IEEE802154_NRF5_RAW)
	pkt_len = nrf5_radio->rx_psdu[0];
	#else
	pkt_len = nrf5_radio->rx_psdu[0] - NRF5_FCS_LENGTH;
	#endif

	/* Skip length (first byte) and copy the payload */
	memcpy(frag->data, nrf5_radio->rx_psdu + 1, pkt_len);
	net_buf_add(frag, pkt_len);

	net_pkt_set_ieee802154_lqi(pkt, nrf5_radio->lqi);
	net_pkt_set_ieee802154_rssi(pkt, nrf5_radio->rssi);

	nrf_drv_radio802154_buffer_free(nrf5_radio->rx_psdu);

	ack_result = ieee802154_radio_handle_ack(nrf5_radio->iface,
	pkt);
	if (ack_result == NET_OK) {
	SYS_LOG_DBG("ACK packet handled");
	goto out;
	}

	SYS_LOG_DBG("Caught a packet (%u) (LQI: %u)",
	pkt_len, nrf5_radio->lqi);

	if (net_recv_data(nrf5_radio->iface, pkt) < 0) {
	SYS_LOG_DBG("Packet dropped by NET stack");
	goto out;
	}

	net_analyze_stack("nRF5 rx stack",
	K_THREAD_STACK_BUFFER(nrf5_radio->rx_stack),
	K_THREAD_STACK_SIZEOF(nrf5_radio->rx_stack));
	continue;

	out:
	if (pkt) {
	net_pkt_unref(pkt);
	}
	}
	}

	/* Radio device API */

	static enum ieee802154_hw_caps nrf5_get_capabilities(struct device *dev)
	{
	return IEEE802154_HW_FCS \|
	IEEE802154_HW_2_4_GHZ \|
	IEEE802154_HW_FILTER;
	}


	static int nrf5_cca(struct device *dev)
	{
	struct nrf5_802154_data *nrf5_radio = NRF5_802154_DATA(dev);

	/* Current implementation of the NRF5 radio driver doesn't provide an
	* explicit API to perform CCA. However, Mode1 CCA (energy above
	* threshold), can be achieved using energy detection function.
	*/
	if (!nrf_drv_radio802154_energy_detection(nrf5_radio->channel, 128)) {
	return -EBUSY;
	}

	/* The nRF driver guarantees that a callback will be called once
	* the ED function is done, thus unlocking the semaphore.
	*/
	k_sem_take(&nrf5_radio->cca_wait, K_FOREVER);
	SYS_LOG_DBG("CCA: %d", nrf5_radio->channel_ed);

	if (nrf5_radio->channel_ed > CONFIG_IEEE802154_NRF5_CCA_ED_THRESHOLD) {
	return -EBUSY;
	}

	return 0;
	}

	static int nrf5_set_channel(struct device *dev, u16_t channel)
	{
	struct nrf5_802154_data *nrf5_radio = NRF5_802154_DATA(dev);

	SYS_LOG_DBG("%u", channel);

	if (channel < 11 \|\| channel > 26) {
	return -EINVAL;
	}

	if (!nrf_drv_radio802154_receive(channel, false)) {
	return -EBUSY;
	}

	nrf5_radio->channel = channel;
	return 0;
	}

	static int nrf5_set_pan_id(struct device *dev, u16_t pan_id)
	{
	u8_t pan_id_le[2];

	ARG_UNUSED(dev);

	sys_put_le16(pan_id, pan_id_le);
	nrf_drv_radio802154_pan_id_set(pan_id_le);

	SYS_LOG_DBG("0x%x", pan_id);
	return 0;
	}

	static int nrf5_set_short_addr(struct device *dev, u16_t short_addr)
	{
	u8_t short_addr_le[2];

	ARG_UNUSED(dev);

	sys_put_le16(short_addr, short_addr_le);
	nrf_drv_radio802154_short_address_set(short_addr_le);

	SYS_LOG_DBG("0x%x", short_addr);
	return 0;
	}

	static int nrf5_set_ieee_addr(struct device dev, const u8_t ieee_addr)
	{
	ARG_UNUSED(dev);

	SYS_LOG_DBG("IEEE address %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
	ieee_addr[7], ieee_addr[6], ieee_addr[5], ieee_addr[4],
	ieee_addr[3], ieee_addr[2], ieee_addr[1], ieee_addr[0]);

	nrf_drv_radio802154_extended_address_set(ieee_addr);

	return 0;
	}

	static int nrf5_set_filter(struct device *dev,
	enum ieee802154_filter_type type,
	const struct ieee802154_filter *filter)
	{
	SYS_LOG_DBG("Applying filter %u", type);

	if (type == IEEE802154_FILTER_TYPE_IEEE_ADDR) {
	return nrf5_set_ieee_addr(dev, filter->ieee_addr);
	} else if (type == IEEE802154_FILTER_TYPE_SHORT_ADDR) {
	return nrf5_set_short_addr(dev, filter->short_addr);
	} else if (type == IEEE802154_FILTER_TYPE_PAN_ID) {
	return nrf5_set_pan_id(dev, filter->pan_id);
	}

	return -EINVAL;
	}

	static int nrf5_set_txpower(struct device *dev, s16_t dbm)
	{
	struct nrf5_802154_data *nrf5_radio = NRF5_802154_DATA(dev);

	SYS_LOG_DBG("%d", dbm);
	nrf5_radio->txpower = dbm;

	return 0;
	}

	static int nrf5_tx(struct device *dev,
	struct net_pkt *pkt,
	struct net_buf *frag)
	{
	struct nrf5_802154_data *nrf5_radio = NRF5_802154_DATA(dev);
	u8_t payload_len = net_pkt_ll_reserve(pkt) + frag->len;
	u8_t *payload = frag->data - net_pkt_ll_reserve(pkt);

	SYS_LOG_DBG("%p (%u)", payload, payload_len);

	nrf5_radio->tx_success = false;
	nrf5_radio->tx_psdu[0] = payload_len + NRF5_FCS_LENGTH;

	memcpy(nrf5_radio->tx_psdu + 1, payload, payload_len);

	if (!nrf_drv_radio802154_transmit(nrf5_radio->tx_psdu,
	nrf5_radio->channel,
	nrf5_radio->txpower)) {
	SYS_LOG_ERR("Cannot send frame");
	return -EIO;
	}

	SYS_LOG_DBG("Sending frame (ch:%d, txpower:%d)",
	nrf5_radio->channel,
	nrf5_radio->txpower);

	/* The nRF driver guarantees that either
	* nrf_drv_radio802154_transmitted() or
	* nrf_drv_radio802154_energy_detected()
	* callback is called, thus unlocking the semaphore.
	*/
	k_sem_take(&nrf5_radio->tx_wait, K_FOREVER);

	SYS_LOG_DBG("Result: %d", nrf5_data.tx_success);

	return nrf5_radio->tx_success ? 0 : -EBUSY;
	}

	static int nrf5_start(struct device *dev)
	{
	struct nrf5_802154_data *nrf5_radio = NRF5_802154_DATA(dev);

	nrf_drv_radio802154_receive(nrf5_radio->channel, false);
	SYS_LOG_DBG("nRF5 802154 radio started (channel: %d)",
	nrf5_radio->channel);

	return 0;
	}

	static int nrf5_stop(struct device *dev)
	{
	ARG_UNUSED(dev);

	if (!nrf_drv_radio802154_sleep()) {
	SYS_LOG_ERR("Error while stopping radio");
	return -EIO;
	}

	SYS_LOG_DBG("nRF5 802154 radio stopped");

	return 0;
	}

	static void nrf5_radio_irq(void *arg)
	{
	ARG_UNUSED(arg);

	nrf_drv_radio802154_irq_handler();
	}

	static void nrf5_config(struct device *dev)
	{
	ARG_UNUSED(dev);

	IRQ_CONNECT(NRF5_IRQ_RADIO_IRQn, 0, nrf5_radio_irq, NULL, 0);
	irq_enable(NRF5_IRQ_RADIO_IRQn);
	}

	static int nrf5_init(struct device *dev)
	{
	const struct nrf5_802154_config *nrf5_radio_cfg = NRF5_802154_CFG(dev);
	struct nrf5_802154_data *nrf5_radio = NRF5_802154_DATA(dev);
	struct device *clk_m16;

	k_sem_init(&nrf5_radio->rx_wait, 0, 1);
	k_sem_init(&nrf5_radio->tx_wait, 0, 1);
	k_sem_init(&nrf5_radio->cca_wait, 0, 1);

	clk_m16 = device_get_binding(CONFIG_CLOCK_CONTROL_NRF5_M16SRC_DRV_NAME);
	if (!clk_m16) {
	return -ENODEV;
	}

	clock_control_on(clk_m16, NULL);

	nrf_drv_radio802154_init();

	nrf5_radio_cfg->irq_config_func(dev);

	k_thread_create(&nrf5_radio->rx_thread, nrf5_radio->rx_stack,
	CONFIG_IEEE802154_NRF5_RX_STACK_SIZE,
	nrf5_rx_thread, dev, NULL, NULL,
	K_PRIO_COOP(2), 0, 0);

	SYS_LOG_INF("nRF5 802154 radio initialized");

	return 0;
	}

	static void nrf5_iface_init(struct net_if *iface)
	{
	struct device *dev = net_if_get_device(iface);
	struct nrf5_802154_data *nrf5_radio = NRF5_802154_DATA(dev);

	SYS_LOG_DBG("");

	nrf5_get_eui64(nrf5_radio->mac);
	net_if_set_link_addr(iface,
	nrf5_radio->mac,
	sizeof(nrf5_radio->mac),
	NET_LINK_IEEE802154);

	nrf5_radio->iface = iface;
	ieee802154_init(iface);
	}

	/* nRF5 radio driver callbacks */

	void nrf_drv_radio802154_received(u8_t *p_data, s8_t power, s8_t lqi)
	{
	nrf5_data.rx_psdu = p_data;
	nrf5_data.rssi = power;
	nrf5_data.lqi = lqi;

	k_sem_give(&nrf5_data.rx_wait);
	}

	void nrf_drv_radio802154_transmitted(bool pending_bit)
	{
	ARG_UNUSED(pending_bit);

	nrf5_data.tx_success = true;
	k_sem_give(&nrf5_data.tx_wait);
	}

	void nrf_drv_radio802154_busy_channel(void)
	{
	k_sem_give(&nrf5_data.tx_wait);
	}

	void nrf_drv_radio802154_energy_detected(s8_t result)
	{
	nrf5_data.channel_ed = result;
	k_sem_give(&nrf5_data.cca_wait);
	}

	static const struct nrf5_802154_config nrf5_radio_cfg = {
	.irq_config_func = nrf5_config,
	};

	static struct ieee802154_radio_api nrf5_radio_api = {
	.iface_api.init = nrf5_iface_init,
	.iface_api.send = ieee802154_radio_send,

	.get_capabilities = nrf5_get_capabilities,
	.cca = nrf5_cca,
	.set_channel = nrf5_set_channel,
	.set_filter = nrf5_set_filter,
	.set_txpower = nrf5_set_txpower,
	.start = nrf5_start,
	.stop = nrf5_stop,
	.tx = nrf5_tx,
	};

	#if defined(CONFIG_IEEE802154_NRF5_RAW)
	DEVICE_AND_API_INIT(nrf5_154_radio, CONFIG_IEEE802154_NRF5_DRV_NAME,
	nrf5_init, &nrf5_data, &nrf5_radio_cfg,
	POST_KERNEL, CONFIG_IEEE802154_NRF5_INIT_PRIO,
	&nrf5_radio_api);
	#else
	NET_DEVICE_INIT(nrf5_154_radio, CONFIG_IEEE802154_NRF5_DRV_NAME,
	nrf5_init, &nrf5_data, &nrf5_radio_cfg,
	CONFIG_IEEE802154_NRF5_INIT_PRIO,
	&nrf5_radio_api, IEEE802154_L2,
	NET_L2_GET_CTX_TYPE(IEEE802154_L2), 125);

	NET_STACK_INFO_ADDR(RX, nrf5_154_radio,
	CONFIG_IEEE802154_NRF5_RX_STACK_SIZE,
	CONFIG_IEEE802154_NRF5_RX_STACK_SIZE,
	nrf5_data.rx_stack, 0);
	#endif