FHSS: Added minimum synch interval

Author: Jarkko Paso

source/Service_Libs/fhss/fhss_ws.c

@@ -91,6 +91,7 @@ fhss_structure_t *fhss_ws_enable(fhss_api_t *fhss_api, const fhss_ws_configurati
     fhss_struct->number_of_channels = channel_count;
     fhss_struct->own_hop = 0xff;
     fhss_struct->rx_channel = fhss_configuration->unicast_fixed_channel;
+    fhss_struct->ws->min_synch_interval = DEFAULT_MIN_SYNCH_INTERVAL;
     fhss_set_txrx_slot_length(fhss_struct);
     ns_list_init(&fhss_struct->fhss_failed_tx_list);
     return fhss_struct;
@@ -666,6 +667,10 @@ int fhss_ws_set_parent(fhss_structure_t *fhss_structure, const uint8_t eui64[8],
     if (!bc_timing_info->broadcast_interval || !bc_timing_info->broadcast_dwell_interval) {
         return -1;
     }
+    if (((uint32_t)fhss_structure->ws->min_synch_interval*1000000) > (fhss_structure->callbacks.read_timestamp(fhss_structure->fhss_api) - fhss_structure->ws->synchronization_time)) {
+        return 0;
+    }
+    fhss_structure->ws->synchronization_time = fhss_structure->callbacks.read_timestamp(fhss_structure->fhss_api);
     platform_enter_critical();
     fhss_stop_timer(fhss_structure, fhss_broadcast_handler);
     uint32_t time_from_reception_ms = (fhss_structure->callbacks.read_timestamp(fhss_structure->fhss_api) - bc_timing_info->bt_rx_timestamp)/1000;

source/Service_Libs/fhss/fhss_ws.h

@@ -23,14 +23,18 @@
 #define WS_NUMBER_OF_CHANNEL_RETRIES    4
 //TX/RX slot length in milliseconds
 #define WS_MAX_TXRX_SLOT_LEN_MS         100
+// Default minimum broadcast synchronization interval in seconds
+#define DEFAULT_MIN_SYNCH_INTERVAL      60
 typedef struct fhss_ws fhss_ws_t;
 
 struct fhss_ws
 {
     uint8_t bc_channel;
     uint16_t uc_slot;
     uint16_t bc_slot;
+    uint16_t min_synch_interval;
     uint32_t txrx_slot_length_ms;
+    uint32_t synchronization_time;
     bool unicast_timer_running;
     bool is_on_bc_channel;
     struct fhss_ws_configuration fhss_configuration;