MAC Ack wait fixed for OFDM (ARMmbed#2552)

Author: Jarkko Paso

source/6LoWPAN/ws/ws_bootstrap.c

@@ -2390,7 +2390,11 @@ int ws_bootstrap_set_rf_config(protocol_interface_info_entry_t *cur, phy_rf_chan
     set_request.value_size = sizeof(phy_rf_channel_configuration_s);
     cur->mac_api->mlme_req(cur->mac_api, MLME_SET, &set_request);
     // Set Ack wait duration
-    uint16_t ack_wait_symbols = WS_ACK_WAIT_SYMBOLS + (WS_TACK_MAX_MS * (rf_configs.datarate / 1000));
+    uint8_t bits_per_symbol = 1;
+    if (rf_configs.modulation == M_OFDM) {
+        bits_per_symbol = 4;
+    }
+    uint16_t ack_wait_symbols = WS_ACK_WAIT_SYMBOLS + (WS_TACK_MAX_MS * (rf_configs.datarate / 1000) / bits_per_symbol);
     set_request.attr = macAckWaitDuration;
     set_request.value_pointer = &ack_wait_symbols;
     set_request.value_size = sizeof(ack_wait_symbols);

source/MAC/IEEE802_15_4/mac_defines.h

@@ -272,7 +272,7 @@ typedef struct protocol_interface_rf_mac_setup {
     int8_t bc_timer_id;
     uint32_t mlme_tick_count;
     uint32_t symbol_rate;
-    uint32_t symbol_time_us;
+    uint32_t symbol_time_ns;
     uint32_t datarate;
     uint8_t max_ED;
     uint16_t mlme_ED_counter;

source/MAC/IEEE802_15_4/mac_mlme.c

@@ -652,11 +652,11 @@ void mac_extended_mac_set(protocol_interface_rf_mac_setup_s *rf_mac_setup, const
 
 static uint32_t mac_calc_ack_wait_duration(protocol_interface_rf_mac_setup_s *rf_mac_setup, uint16_t symbols)
 {
-    uint32_t AckWaitDuration = 0;
+    uint32_t AckWaitDuration_us = 0;
     if (rf_mac_setup->rf_csma_extension_supported) {
-        AckWaitDuration = symbols * rf_mac_setup->symbol_time_us;
+        AckWaitDuration_us = (symbols * rf_mac_setup->symbol_time_ns) / 1000;
     }
-    return AckWaitDuration;
+    return AckWaitDuration_us;
 }
 
 static int8_t mac_mlme_set_ack_wait_duration(protocol_interface_rf_mac_setup_s *rf_mac_setup, const mlme_set_t *set_req)
@@ -1107,8 +1107,8 @@ static int mac_mlme_set_symbol_rate(protocol_interface_rf_mac_setup_s *rf_mac_se
 {
     if (rf_mac_setup->rf_csma_extension_supported) {
         rf_mac_setup->dev_driver->phy_driver->extension(PHY_EXTENSION_GET_SYMBOLS_PER_SECOND, (uint8_t *) &rf_mac_setup->symbol_rate);
-        rf_mac_setup->symbol_time_us = 1000000 / rf_mac_setup->symbol_rate;
-        tr_debug("SW-MAC driver support rf extension %"PRIu32" symbol/seconds  %"PRIu32" us symbol time length", rf_mac_setup->symbol_rate, rf_mac_setup->symbol_time_us);
+        rf_mac_setup->symbol_time_ns = 1000000000 / rf_mac_setup->symbol_rate;
+        tr_debug("SW-MAC driver support rf extension %"PRIu32" symbol/seconds  %"PRIu32" ns symbol time length", rf_mac_setup->symbol_rate, rf_mac_setup->symbol_time_ns);
         return 0;
     }
     return -1;

source/MAC/IEEE802_15_4/mac_pd_sap.c

@@ -97,7 +97,7 @@ uint32_t mac_csma_backoff_get(protocol_interface_rf_mac_setup_s *rf_mac_setup)
     uint32_t backoff_in_us;
     //Multiple aUnitBackoffPeriod symbol time
     if (rf_mac_setup->rf_csma_extension_supported) {
-        backoff_in_us = backoff * rf_mac_setup->aUnitBackoffPeriod * rf_mac_setup->symbol_time_us;
+        backoff_in_us = backoff * rf_mac_setup->aUnitBackoffPeriod * (rf_mac_setup->symbol_time_ns / 1000);
     } else {
         backoff_in_us = backoff * rf_mac_setup->backoff_period_in_10us * 10;
     }

source/Service_Libs/fhss/fhss_ws.h

@@ -22,7 +22,7 @@
 // Max TX/RX slot length in milliseconds. Is used when datarate is not given by PHY or calculated slot length exceeds maximum allowed.
 #define WS_TXRX_SLOT_LEN_MS_MAX         100
 // Min TX/RX slot length in milliseconds. Is used when calculated slot length is under minimum allowed.
-#define WS_TXRX_SLOT_LEN_MS_MIN         10
+#define WS_TXRX_SLOT_LEN_MS_MIN         13
 // Default minimum broadcast synchronization interval in seconds
 #define DEFAULT_MIN_SYNCH_INTERVAL      60
 // Drift compensation allowed if at least SYNCH_COMPENSATION_MIN_INTERVAL (seconds) since last synchronization