drivers: ieee802154_nrf5: Add CSMA CA transmit capability

Add CSMA CA capability for the `ieee802154_nrf5` radio driver along with
appropriate implementation in the `nrf5_tx` function.

Introduce 802.15.4 radio driver with CSMA/CA support enabled. Add help
text, mentioning a list of peripherals occupied by the radio driver.

Signed-off-by: Robert Lubos <robert.lubos@nordicsemi.no>

drivers/ieee802154/ieee802154_nrf5.c

@@ -48,7 +48,12 @@ struct nrf5_802154_config {
 
 static struct nrf5_802154_data nrf5_data;
 
-#define ACK_TIMEOUT K_MSEC(10)
+/* Increase ACK timeout to cover the maximum CSMA CA time in default
+ * configuration. 40ms is enough time to cover worst-case CSMA/CA scenario in
+ * default configuration (CSMA/CA + transmit + ACK delay).
+ * TODO Switch to ACK timeout at driver level.
+ */
+#define ACK_TIMEOUT K_MSEC(40)
 
 /* Convenience defines for RADIO */
 #define NRF5_802154_DATA(dev) \
@@ -143,12 +148,11 @@ drop:
 
 static enum ieee802154_hw_caps nrf5_get_capabilities(struct device *dev)
 {
-	return IEEE802154_HW_FCS | IEEE802154_HW_2_4_GHZ |
+	return IEEE802154_HW_FCS | IEEE802154_HW_FILTER |
-	       IEEE802154_HW_TX_RX_ACK | IEEE802154_HW_FILTER |
+	       IEEE802154_HW_CSMA | IEEE802154_HW_2_4_GHZ |
-	       IEEE802154_HW_ENERGY_SCAN;
+	       IEEE802154_HW_TX_RX_ACK | IEEE802154_HW_ENERGY_SCAN;
 }
 
-
 static int nrf5_cca(struct device *dev)
 {
 	struct nrf5_802154_data *nrf5_radio = NRF5_802154_DATA(dev);
@@ -329,11 +333,7 @@ static int nrf5_tx(struct device *dev,
 	struct nrf5_802154_data *nrf5_radio = NRF5_802154_DATA(dev);
 	u8_t payload_len = frag->len;
 	u8_t *payload = frag->data;
-
+	bool ret = true;
-	if (mode != IEEE802154_TX_MODE_DIRECT) {
-		NET_ERR("TX mode %d not supported", mode);
-		return -ENOTSUP;
-	}
 
 	LOG_DBG("%p (%u)", payload, payload_len);
 
@@ -343,7 +343,24 @@ static int nrf5_tx(struct device *dev,
 	/* Reset semaphore in case ACK was received after timeout */
 	k_sem_reset(&nrf5_radio->tx_wait);
 
-	if (!nrf_802154_transmit_raw(nrf5_radio->tx_psdu, false)) {
+	switch (mode) {
+	case IEEE802154_TX_MODE_DIRECT:
+		ret = nrf_802154_transmit_raw(nrf5_radio->tx_psdu, false);
+		break;
+	case IEEE802154_TX_MODE_CCA:
+		ret = nrf_802154_transmit_raw(nrf5_radio->tx_psdu, true);
+		break;
+	case IEEE802154_TX_MODE_CSMA_CA:
+		nrf_802154_transmit_csma_ca_raw(nrf5_radio->tx_psdu);
+		break;
+	case IEEE802154_TX_MODE_TXTIME:
+	case IEEE802154_TX_MODE_TXTIME_CCA:
+	default:
+		NET_ERR("TX mode %d not supported", mode);
+		return -ENOTSUP;
+	}
+
+	if (!ret) {
 		LOG_ERR("Cannot send frame");
 		return -EIO;
 	}

modules/Kconfig.nordic

@@ -11,6 +11,12 @@ menu "Nordic drivers"
 menuconfig NRF_802154_RADIO_DRIVER
 	bool "Enable nRF IEEE 802.15.4 radio driver"
 	depends on HAS_HW_NRF_RADIO_IEEE802154
+	help
+	  This option enables nRF IEEE 802.15.4 radio driver in Zephyr. Note,
+	  that beside the radio peripheral itself, this drivers occupies several
+	  other peripherals. A complete list can be found in the hal_nordic
+	  repository, within drivers/nrf_radio_802154/nrf_802154_peripherals.h
+	  file.
 
 if NRF_802154_RADIO_DRIVER
 

west.yml

@@ -53,7 +53,7 @@ manifest:
       revision: a12d92816a53a521d79cefcf5c38b9dc8a4fed6e
       path: modules/hal/cypress
     - name: hal_nordic
-      revision: 59d33bc1dd59df14feb26f0010d527c1ea7a89e8
+      revision: 0774efffa3d095025a55611719020fa23278eeda
       path: modules/hal/nordic
     - name: hal_openisa
       revision: 3b54187649cc9b37161d49918f1ad28ff7c7f830