X-Git-Url: https://oss.titaniummirror.com/gitweb/?a=blobdiff_plain;f=tos%2Fchips%2Fcc2420%2FCC2420ActiveMessageP.nc;h=f3d5de3987dca244cca393046eae84d606713874;hb=e9bfab607e051bae6afb47b44892ce37541d1b44;hp=7a111f53603fe9e54d70a37c8750f82ad030d8db;hpb=fdb0ac0c318844a25bb5c15ba5c20968dde24b03;p=tinyos-2.x.git

diff --git a/tos/chips/cc2420/CC2420ActiveMessageP.nc b/tos/chips/cc2420/CC2420ActiveMessageP.nc
index 7a111f53..f3d5de39 100644
--- a/tos/chips/cc2420/CC2420ActiveMessageP.nc
+++ b/tos/chips/cc2420/CC2420ActiveMessageP.nc
@@ -1,4 +1,4 @@
-/*									tab:4
+/*
  * "Copyright (c) 2005 Stanford University. All rights reserved.
  *
  * Permission to use, copy, modify, and distribute this software and
@@ -34,7 +34,7 @@
  
 #include "CC2420.h"
 
-module CC2420ActiveMessageP {
+module CC2420ActiveMessageP @safe() {
   provides {
     interface AMSend[am_id_t id];
     interface Receive[am_id_t id];
@@ -42,6 +42,7 @@ module CC2420ActiveMessageP {
     interface AMPacket;
     interface Packet;
     interface SendNotifier[am_id_t id];
+    interface RadioBackoff[am_id_t id];
   }
   
   uses {
@@ -51,26 +52,58 @@ module CC2420ActiveMessageP {
     interface CC2420PacketBody;
     interface CC2420Config;
     interface ActiveMessageAddress;
+    interface RadioBackoff as SubBackoff;
+
+    interface Resource as RadioResource;
+    interface Leds;
   }
 }
 implementation {
+  uint16_t pending_length;
+  message_t *pending_message = NULL;
+  /***************** Resource event  ****************/
+  event void RadioResource.granted() {
+    uint8_t rc;
+    cc2420_header_t* header = call CC2420PacketBody.getHeader( pending_message );
+
+    signal SendNotifier.aboutToSend[header->type](header->dest, pending_message);
+    rc = call SubSend.send( pending_message, pending_length );
+    if (rc != SUCCESS) {
+      call RadioResource.release();
+      signal AMSend.sendDone[header->type]( pending_message, rc );
+    }
+  }
 
-  enum {
-    CC2420_SIZE = MAC_HEADER_SIZE + MAC_FOOTER_SIZE,
-  };
-  
   /***************** AMSend Commands ****************/
   command error_t AMSend.send[am_id_t id](am_addr_t addr,
 					  message_t* msg,
 					  uint8_t len) {
     cc2420_header_t* header = call CC2420PacketBody.getHeader( msg );
+    
+    if (len > call Packet.maxPayloadLength()) {
+      return ESIZE;
+    }
+    
     header->type = id;
     header->dest = addr;
     header->destpan = call CC2420Config.getPanAddr();
+    header->src = call AMPacket.address();
     
-    signal SendNotifier.aboutToSend[id](addr, msg);
-    
-    return call SubSend.send( msg, len + CC2420_SIZE );
+    if (call RadioResource.immediateRequest() == SUCCESS) {
+      error_t rc;
+      signal SendNotifier.aboutToSend[id](addr, msg);
+      
+      rc = call SubSend.send( msg, len );
+      if (rc != SUCCESS) {
+        call RadioResource.release();
+      }
+
+      return rc;
+    } else {
+      pending_length  = len;
+      pending_message = msg;
+      return call RadioResource.request();
+    }
   }
 
   command error_t AMSend.cancel[am_id_t id](message_t* msg) {
@@ -141,8 +174,8 @@ implementation {
 
   /***************** Packet Commands ****************/
   command void Packet.clear(message_t* msg) {
-    memset(call CC2420PacketBody.getHeader(msg), sizeof(cc2420_header_t), 0);
-    memset(call CC2420PacketBody.getMetadata(msg), sizeof(cc2420_metadata_t), 0);
+    memset(call CC2420PacketBody.getHeader(msg), 0x0, sizeof(cc2420_header_t));
+    memset(call CC2420PacketBody.getMetadata(msg), 0x0, sizeof(cc2420_metadata_t));
   }
   
   command uint8_t Packet.payloadLength(message_t* msg) {
@@ -154,7 +187,7 @@ implementation {
   }
   
   command uint8_t Packet.maxPayloadLength() {
-    return TOSH_DATA_LENGTH;
+    return call SubSend.maxPayloadLength();
   }
   
   command void* Packet.getPayload(message_t* msg, uint8_t len) {
@@ -164,6 +197,7 @@ implementation {
   
   /***************** SubSend Events ****************/
   event void SubSend.sendDone(message_t* msg, error_t result) {
+    call RadioResource.release();
     signal AMSend.sendDone[call AMPacket.type(msg)](msg, result);
   }
 
@@ -171,15 +205,11 @@ implementation {
   /***************** SubReceive Events ****************/
   event message_t* SubReceive.receive(message_t* msg, void* payload, uint8_t len) {
     
-    if(!(call CC2420PacketBody.getMetadata(msg))->crc) {
-      return msg;
-    }
-    
     if (call AMPacket.isForMe(msg)) {
-      return signal Receive.receive[call AMPacket.type(msg)](msg, payload, len - CC2420_SIZE);
+      return signal Receive.receive[call AMPacket.type(msg)](msg, payload, len);
     }
     else {
-      return signal Snoop.receive[call AMPacket.type(msg)](msg, payload, len - CC2420_SIZE);
+      return signal Snoop.receive[call AMPacket.type(msg)](msg, payload, len);
     }
   }
   
@@ -192,6 +222,46 @@ implementation {
   event void CC2420Config.syncDone( error_t error ) {
   }
   
+  
+  /***************** RadioBackoff ***********************/
+
+  async event void SubBackoff.requestInitialBackoff(message_t *msg) {
+    signal RadioBackoff.requestInitialBackoff[(TCAST(cc2420_header_t* ONE,
+        (uint8_t*)msg + offsetof(message_t, data) - sizeof(cc2420_header_t)))->type](msg);
+  }
+
+  async event void SubBackoff.requestCongestionBackoff(message_t *msg) {
+    signal RadioBackoff.requestCongestionBackoff[(TCAST(cc2420_header_t* ONE,
+        (uint8_t*)msg + offsetof(message_t, data) - sizeof(cc2420_header_t)))->type](msg);
+  }
+  async event void SubBackoff.requestCca(message_t *msg) {
+    // Lower layers than this do not configure the CCA settings
+    signal RadioBackoff.requestCca[(TCAST(cc2420_header_t* ONE,
+        (uint8_t*)msg + offsetof(message_t, data) - sizeof(cc2420_header_t)))->type](msg);
+  }
+
+  async command void RadioBackoff.setInitialBackoff[am_id_t amId](uint16_t backoffTime) {
+    call SubBackoff.setInitialBackoff(backoffTime);
+  }
+  
+  /**
+   * Must be called within a requestCongestionBackoff event
+   * @param backoffTime the amount of time in some unspecified units to backoff
+   */
+  async command void RadioBackoff.setCongestionBackoff[am_id_t amId](uint16_t backoffTime) {
+    call SubBackoff.setCongestionBackoff(backoffTime);
+  }
+
+      
+  /**
+   * Enable CCA for the outbound packet.  Must be called within a requestCca
+   * event
+   * @param ccaOn TRUE to enable CCA, which is the default.
+   */
+  async command void RadioBackoff.setCca[am_id_t amId](bool useCca) {
+    call SubBackoff.setCca(useCca);
+  }
+  
   /***************** Defaults ****************/
   default event message_t* Receive.receive[am_id_t id](message_t* msg, void* payload, uint8_t len) {
     return msg;
@@ -202,9 +272,21 @@ implementation {
   }
 
   default event void AMSend.sendDone[uint8_t id](message_t* msg, error_t err) {
+    call RadioResource.release();
   }
 
   default event void SendNotifier.aboutToSend[am_id_t amId](am_addr_t addr, message_t *msg) {
   }
+  default async event void RadioBackoff.requestInitialBackoff[am_id_t id](
+      message_t *msg) {
+  }
+
+  default async event void RadioBackoff.requestCongestionBackoff[am_id_t id](
+      message_t *msg) {
+  }
+  
+  default async event void RadioBackoff.requestCca[am_id_t id](
+      message_t *msg) {
+  }
   
 }