Diff: ussd/USSDInterface.cpp

Revision:

8:04b6a042595f

Parent:

0:3b2f052c333b

Child:

12:66dc2c8eba2d

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ussd/USSDInterface.cpp	Tue Jun 26 13:44:59 2012 +0000
@@ -0,0 +1,152 @@
+/* USSDInterface.cpp */
+/*
+Copyright (C) 2012 ARM Limited.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#define __DEBUG__ 4
+#ifndef __MODULE__
+#define __MODULE__ "USSDInterface.cpp"
+#endif
+
+#include "core/fwk.h"
+
+#include "USSDInterface.h"
+
+#include <cstdio>
+
+#define DEFAULT_TIMEOUT 10000
+#define USSD_TIMEOUT 15000
+
+USSDInterface::USSDInterface(ATCommandsInterface* pIf) : m_pIf(pIf), m_responseMtx(), m_responseSphre(1), m_result(NULL), m_maxResultLength(0)
+{
+  m_responseSphre.wait(0); //Take ownership of the semaphore
+  m_pIf->registerEventsHandler(this); //Add us to the unsolicited result codes handlers
+}
+
+int USSDInterface::init()
+{
+  DBG("Initialization done");
+  return OK;
+}
+
+int USSDInterface::send(const char* command, char* result, size_t maxLength)
+{
+  if (strlen(command) > 20) //Prevent buffer overflow
+  {
+    return NET_TOOSMALL;
+  }
+
+  m_responseMtx.lock();
+  m_result = result;
+  m_maxResultLength = maxLength;
+  m_responseMtx.unlock();
+
+  m_responseSphre.wait(0); //Make sure there is not a pending result that needs to be discarded
+
+  DBG("Send USSD command & register for unsolicited result codes");
+  //Send USSD command to the network
+  char cmd[32];
+  std::sprintf(cmd, "AT+CUSD=1,\"%s\"", command);
+  int ret = m_pIf->executeSimple(cmd, NULL, DEFAULT_TIMEOUT);
+  if( ret != OK )
+  {
+    return NET_PROTOCOL;
+  }
+
+  //Now wait for response
+  int res = m_responseSphre.wait(USSD_TIMEOUT);
+
+  //Reset data
+  m_responseMtx.lock();
+  m_result = NULL;
+  m_maxResultLength = 0;
+  m_responseMtx.unlock();
+
+  if(res <= 0)
+  {
+    DBG("No result received");
+    ret = m_pIf->executeSimple("AT+CUSD=2", NULL, DEFAULT_TIMEOUT); //Cancel command
+    if( ret != OK )
+    {
+      return NET_PROTOCOL;
+    }
+    return NET_TIMEOUT;
+  }
+
+  DBG("Result received: %s", result);
+
+  return OK;
+
+}
+
+/*virtual*/ bool USSDInterface::isATCodeHandled(const char* atCode) //Is this AT code handled
+{
+  DBG("AT code is %s", atCode);
+  if( strcmp("+CUSD", atCode) == 0 )
+  {
+    return true;
+  }
+
+  DBG("Not handled");
+  return false;
+}
+
+/*virtual*/ void USSDInterface::onDispatchStart()
+{
+
+
+}
+
+/*virtual*/ void USSDInterface::onDispatchStop()
+{
+
+}
+
+/*virtual*/ void USSDInterface::onEvent(const char* atCode, const char* evt)
+{
+  if( strcmp("+CUSD", atCode) != 0 )
+  {
+    return; //Not supported
+  }
+
+  char* pStart = (char*) strchr(evt,'\"');
+  if(pStart==NULL)
+  {
+    return; //Invalid/incomplete response
+  }
+  pStart++; //Point to first char of response
+  char* pEnd = (char*) strchr(pStart,'\"');
+  if(pEnd==NULL)
+  {
+    return; //Invalid/incomplete response
+  }
+  m_responseMtx.lock();
+  if(m_maxResultLength == 0) //No pending command
+  {
+    m_responseMtx.unlock();
+    return;
+  }
+  size_t cpyLen = MIN( pEnd - pStart, m_maxResultLength - 1 );
+  memcpy(m_result, pStart, cpyLen);
+  m_result[cpyLen] = '\0';
+  m_responseMtx.unlock();
+  m_responseSphre.release(); //Signal user thread that response is ready
+}