MAC: Created a function to set TX time

Author: Jarkko Paso

nanostack/platform/arm_hal_phy.h

@@ -56,7 +56,7 @@ typedef enum {
     PHY_EXTENSION_READ_LINK_STATUS, /**< Net library could read link status. */
     PHY_EXTENSION_CONVERT_SIGNAL_INFO, /**< Convert signal info. */
     PHY_EXTENSION_ACCEPT_ANY_BEACON, /**< Set boolean true or false for accept beacon from other Pan-ID than configured. Default value should be false */
-    PHY_EXTENSION_SET_TX_TIME,  /**< Net library sets transmission time based on global time stamp. */
+    PHY_EXTENSION_SET_TX_TIME,  /**< Net library sets transmission time based on global time stamp. Max. 65ms from setting to TX */
     PHY_EXTENSION_READ_RX_TIME, /**< Read the time of last reception based on global time stamp. */
 } phy_extension_type_e;
 

source/MAC/IEEE802_15_4/mac_pd_sap.c

@@ -160,6 +160,33 @@ int8_t mac_pd_sap_req(protocol_interface_rf_mac_setup_s *rf_mac_setup)
     return 0;
 }
 
+/**
+ * Set PHY TX time.
+ *
+ * \param rf_mac_setup pointer to MAC
+ * \param time_to_tx Time from present time to wanted TX time (us)
+ * \return 0 if success, -1 when FHSS not registered
+ *
+ */
+static int mac_pd_sap_set_tx_time(protocol_interface_rf_mac_setup_s *rf_mac_setup, uint16_t time_to_tx)
+{
+    if (rf_mac_setup->fhss_api) {
+        // Max. TX time is 65ms
+        if (time_to_tx > 65000) {
+            time_to_tx = 65000;
+        }
+        uint8_t tx_time_buffer[4];
+        uint32_t tx_time = rf_mac_setup->fhss_api->read_timestamp(rf_mac_setup->fhss_api) + time_to_tx;
+        if (!tx_time) {
+            tx_time++;
+        }
+        common_write_32_bit(tx_time, tx_time_buffer);
+        rf_mac_setup->dev_driver->phy_driver->extension(PHY_EXTENSION_SET_TX_TIME, tx_time_buffer);
+        return 0;
+    }
+    return -1;
+}
+
 /**
  * Run Mac data interface state Machine for mac timer.
  *

source/MAC/rf_driver_storage.c

@@ -95,6 +95,12 @@ int8_t arm_net_phy_register(phy_device_driver_s *phy_driver)
     if (new->phy_driver->state_control) {
         new->phy_driver->state_control(PHY_INTERFACE_RESET, 0);
     }
+    if (new->phy_driver->extension) {
+        uint8_t tx_time_buffer[4];
+        uint32_t tx_time = 0;
+        common_write_32_bit(tx_time, tx_time_buffer);
+        new->phy_driver->extension(PHY_EXTENSION_SET_TX_TIME, tx_time_buffer);
+    }
     ns_list_add_to_end(&arm_device_driver_list, new);
 
     return new->id;