Diff: drv/serial/buf/SerialBuf.cpp

Revision:

0:ac1725ba162c

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/drv/serial/buf/SerialBuf.cpp	Tue Nov 09 20:54:15 2010 +0000
@@ -0,0 +1,235 @@
+
+/*
+Copyright (c) 2010 Donatien Garnier (donatiengar [at] gmail [dot] com)
+ 
+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.
+*/
+
+#include "SerialBuf.h"
+#include "mbed.h"
+
+//#define __DEBUG
+#include "dbg/dbg.h"
+
+#include "netCfg.h"
+#if NET_GPRS
+
+#if NET_USB_SERIAL
+#define m_pStream( a ) (m_pSerial?m_pSerial->a:m_pUsbSerial->a)
+#else
+#define m_pStream( a ) (m_pSerial->a)
+#endif
+
+//Circular buf
+
+SerialCircularBuf::SerialCircularBuf(int len) : m_readMode(false)
+{
+  m_buf = new char[len];
+  m_len = len;
+  m_pReadStart = m_pRead = m_buf;
+  m_pWrite = m_buf;
+} 
+
+SerialCircularBuf::~SerialCircularBuf()
+{
+  if(m_buf)
+    delete[] m_buf;
+}
+
+int SerialCircularBuf::room() //Return room available in buf
+{
+  //return m_len - len() - 1; //-1 is to avoid loop
+  if ( m_pReadStart > m_pWrite )
+    return ( m_pReadStart - m_pWrite - 1 );
+  else
+    return m_len - ( m_pWrite - m_pReadStart ) - 1;
+}
+
+int SerialCircularBuf::len() //Return chars length in buf
+{
+  if ( m_pWrite >= m_pRead )
+    return ( m_pWrite - m_pRead );
+  else
+    return m_len - ( m_pRead - m_pWrite ); // = ( ( m_buf + m_len) - m_pRead ) + ( m_pWrite - m_buf )
+}
+
+void SerialCircularBuf::write(char c)
+{
+#if 0
+  if(!room())
+    return;
+#endif
+  //WARN: Must call room() before
+  *m_pWrite = c;
+  m_pWrite++;
+  if(m_pWrite>=m_buf+m_len)
+    m_pWrite=m_buf;
+}
+char SerialCircularBuf::read()
+{
+#if 0
+  if(!len())
+    return 0;
+#endif
+  //WARN: Must call len() before
+  char c = *m_pRead;
+  m_pRead++;
+  
+  if(m_pRead>=m_buf+m_len)
+    m_pRead=m_buf;
+    
+  if(!m_readMode) //If readmode=false, trash this char
+    m_pReadStart=m_pRead;
+    
+  return c;
+}
+
+void SerialCircularBuf::setReadMode(bool readMode) //If true, keeps chars in buf when read, false by default
+{
+  if(m_readMode == true && readMode == false)
+  {
+    //Trash bytes that have been read
+    flushRead();
+  }
+  m_readMode = readMode;
+}
+
+void SerialCircularBuf::flushRead() //Delete chars that have been read & return chars len (only useful with readMode = true)
+{
+  m_pReadStart = m_pRead;
+}
+
+void SerialCircularBuf::resetRead() //Go back to initial read position & return chars len (only useful with readMode = true)
+{
+  m_pRead = m_pReadStart;
+}
+
+//SerialBuf
+
+SerialBuf::SerialBuf(int len) : m_rxBuf(len), m_txBuf(len), m_pSerial(NULL) //Buffer length
+#if NET_USB_SERIAL
+, m_pUsbSerial(NULL) 
+#endif
+{
+  DBG("New Serial buf@%p\n", this);
+}
+
+SerialBuf::~SerialBuf()
+{
+
+}
+
+void SerialBuf::attach(Serial* pSerial)
+{
+  DBG("Serial buf@%p in attach\n", this);
+  m_pSerial = pSerial;
+  m_pSerial->attach<SerialBuf>(this, &SerialBuf::onRxInterrupt, Serial::RxIrq);
+  m_pSerial->attach<SerialBuf>(this, &SerialBuf::onTxInterrupt, Serial::TxIrq);
+  onRxInterrupt(); //Read data
+}
+
+void SerialBuf::detach()
+{
+  if(m_pSerial)
+  {
+    m_pSerial->attach<SerialBuf>(NULL, NULL, Serial::RxIrq);
+    m_pSerial->attach<SerialBuf>(NULL, NULL, Serial::TxIrq);
+    m_pSerial = NULL;
+  }
+  #if NET_USB_SERIAL
+  else if(m_pUsbSerial)
+  {
+    m_pUsbSerial->attach<SerialBuf>(NULL, NULL, UsbSerial::RxIrq);
+    m_pUsbSerial->attach<SerialBuf>(NULL, NULL, UsbSerial::TxIrq);
+    m_pUsbSerial = NULL;
+  }
+  #endif
+}
+
+#if NET_USB_SERIAL
+void SerialBuf::attach(UsbSerial* pUsbSerial)
+{
+  m_pUsbSerial = pUsbSerial;
+  m_pUsbSerial->attach<SerialBuf>(this, &SerialBuf::onRxInterrupt, UsbSerial::RxIrq);
+  m_pUsbSerial->attach<SerialBuf>(this, &SerialBuf::onTxInterrupt, UsbSerial::TxIrq);
+  onRxInterrupt(); //Read data
+}
+#endif
+
+char SerialBuf::getc()
+{
+  while(!readable());
+  char c = m_rxBuf.read();
+  return c;
+}
+
+void SerialBuf::putc(char c)
+{
+  while(!writeable());
+  m_txBuf.write(c);
+  onTxInterrupt();
+}
+
+bool SerialBuf::readable()
+{
+  if( !m_rxBuf.len() ) //Fill buf if possible
+    onRxInterrupt();
+  return (m_rxBuf.len() > 0);
+}
+
+bool SerialBuf::writeable()
+{
+  if( !m_txBuf.room() ) //Free buf is possible
+    onTxInterrupt();
+  return (m_txBuf.room() > 0);
+}
+
+void SerialBuf::setReadMode(bool readMode) //If true, keeps chars in buf when read, false by default
+{
+  m_rxBuf.setReadMode(readMode);
+}
+
+void SerialBuf::flushRead() //Delete chars that have been read & return chars len (only useful with readMode = true)
+{
+  m_rxBuf.flushRead();
+}
+
+void SerialBuf::resetRead() //Go back to initial read position & return chars len (only useful with readMode = true)
+{
+  m_rxBuf.resetRead();
+}
+
+void SerialBuf::onRxInterrupt() //Callback from m_pSerial
+{
+  while( m_rxBuf.room() && m_pStream(readable()) )
+  {
+    m_rxBuf.write(m_pStream(getc()));
+  }
+}
+
+void SerialBuf::onTxInterrupt() //Callback from m_pSerial
+{
+  while( m_txBuf.len() && m_pStream(writeable()) )
+  {
+    m_pStream(putc(m_txBuf.read()));
+  }
+}
+
+
+#endif