Diff: drv/serial/usb/UsbSerial.cpp

Revision:

0:2a53a4c3238c

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/drv/serial/usb/UsbSerial.cpp	Mon Aug 13 15:07:40 2012 +0000
@@ -0,0 +1,300 @@
+
+/*
+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 "rpc.h"
+
+#include "UsbSerial.h"
+
+//#define __DEBUG
+#include "dbg/dbg.h"
+
+#include "netCfg.h"
+#if NET_USB_SERIAL
+
+namespace mbed {
+
+#define BUF_LEN 64
+#define FLUSH_TMOUT 100000 //US
+
+UsbSerial::UsbSerial(UsbDevice* pDevice, int epIn, int epOut, const char* name /*= NULL*/) : Stream(name), m_epIn(pDevice, epIn, true, USB_BULK, BUF_LEN), m_epOut(pDevice, epOut, false, USB_BULK, BUF_LEN),
+m_pInCbItem(NULL), m_pInCbMeth(NULL), m_pOutCbItem(NULL), m_pOutCbMeth(NULL)
+{ 
+  m_inBufEven = new char[BUF_LEN];
+  m_inBufOdd = new char[BUF_LEN];
+  m_pInBufPos = m_inBufUsr = m_inBufEven;
+  m_inBufTrmt = m_inBufOdd;
+  
+  m_outBufEven = new char[BUF_LEN];
+  m_outBufOdd = new char[BUF_LEN];
+  m_pOutBufPos = m_outBufUsr = m_outBufEven;
+  m_outBufTrmt = m_outBufOdd;
+  
+  m_inBufLen = m_outBufLen = 0;
+  
+  DBG("Starting RX'ing on in ep\n");
+  
+  m_timeout = false;
+  
+  m_epIn.setOnCompletion(this, &UsbSerial::onEpInTransfer);
+  m_epOut.setOnCompletion(this, &UsbSerial::onEpOutTransfer);
+  
+  startRx();
+}
+
+UsbSerial::~UsbSerial()
+{
+  delete[] m_inBufEven;
+  delete[] m_inBufOdd;
+  delete[] m_outBufEven;
+  delete[] m_outBufOdd;
+}
+
+void UsbSerial::baud(int baudrate) { 
+    //
+}
+
+void UsbSerial::format(int bits, int parity, int stop) { 
+  //
+} 
+
+#if 0 //For doc only
+template <class T>
+void attach(T* pCbItem, void (T::*pCbMeth)())
+{
+  m_pCbItem = (CDummy*) pCbItem;
+  m_pCbMeth = (void (CDummy::*)()) pCbMeth;
+}
+#endif
+
+int UsbSerial::_getc() { 
+    NVIC_DisableIRQ(US_TICKER_TIMER_IRQn);
+    NVIC_DisableIRQ(USB_IRQn);
+    char c;
+    c = *m_pInBufPos;
+    m_pInBufPos++;
+    NVIC_EnableIRQ(USB_IRQn);
+    NVIC_EnableIRQ(US_TICKER_TIMER_IRQn);
+    return c;
+}
+
+int UsbSerial::_putc(int c) { 
+    NVIC_DisableIRQ(US_TICKER_TIMER_IRQn);
+    NVIC_DisableIRQ(USB_IRQn);
+    if( (m_pOutBufPos - m_outBufUsr) < BUF_LEN )
+    {
+      *m_pOutBufPos = (char) c;
+      m_pOutBufPos++;
+    }
+    else
+    {
+      DBG("NO WAY!!!\n");
+    }
+    #if 1
+    if( (m_pOutBufPos - m_outBufUsr) >= BUF_LEN ) //Must flush
+    {
+      if(m_timeout)
+        m_txTimeout.detach();
+      startTx();
+    }
+    else
+    {
+      /*if(m_timeout)
+        m_txTimeout.detach();
+      m_timeout = true;
+      m_txTimeout.attach_us(this, &UsbSerial::startTx, FLUSH_TMOUT);*/
+      if(!m_timeout)
+      {
+        m_timeout = true;
+        m_txTimeout.attach_us(this, &UsbSerial::startTx, FLUSH_TMOUT);
+      }
+    }
+    #endif
+    //startTx();
+    NVIC_EnableIRQ(USB_IRQn);
+    NVIC_EnableIRQ(US_TICKER_TIMER_IRQn);
+    return c;
+}
+
+int UsbSerial::readable() { 
+    NVIC_DisableIRQ(US_TICKER_TIMER_IRQn);
+    NVIC_DisableIRQ(USB_IRQn);
+    int res;
+    if( (m_pInBufPos - m_inBufUsr) < m_inBufLen )
+    {
+      //DBG("\r\nREADABLE\r\n");
+      res = true;
+    }
+    else
+    {
+      //DBG("\r\nNOT READABLE\r\n");
+      startRx(); //Try to swap packets & start another transmission
+      res = ((m_pInBufPos - m_inBufUsr) < m_inBufLen )?true:false;
+    }
+    NVIC_EnableIRQ(USB_IRQn);
+    NVIC_EnableIRQ(US_TICKER_TIMER_IRQn);
+    return (bool)res;
+}
+
+int UsbSerial::writeable() { 
+    NVIC_DisableIRQ(US_TICKER_TIMER_IRQn);
+    NVIC_DisableIRQ(USB_IRQn);
+  //  DBG("\r\nWRITEABLE???\r\n");
+    int res = (bool)( (m_pOutBufPos - m_outBufUsr) < BUF_LEN);
+    NVIC_EnableIRQ(USB_IRQn);
+    NVIC_EnableIRQ(US_TICKER_TIMER_IRQn);
+    return res;
+}
+
+void UsbSerial::onReadable()
+{
+  if(m_pInCbItem && m_pInCbMeth)
+    (m_pInCbItem->*m_pInCbMeth)();
+}
+
+void UsbSerial::onWriteable()
+{
+  if(m_pOutCbItem && m_pOutCbMeth)
+    (m_pOutCbItem->*m_pOutCbMeth)();
+}
+
+void UsbSerial::onEpInTransfer()
+{
+  int len = m_epIn.status();
+  DBG("RX transfer completed w len=%d\n",len);
+  startRx();
+  if(len > 0)
+    onReadable();
+}
+
+void UsbSerial::onEpOutTransfer()
+{
+  int len = m_epOut.status();
+  DBG("TX transfer completed w len=%d\n",len);
+  if(m_timeout)
+    m_txTimeout.detach();
+  startTx();
+  if(len > 0)
+    onWriteable();
+}
+
+void UsbSerial::startTx()
+{
+  
+  DBG("Transfer>\n");
+  
+  m_timeout = false;
+  
+//  m_txTimeout.detach();
+   
+  if(!(m_pOutBufPos - m_outBufUsr))
+  {
+    DBG("?!?!?\n");
+    return;
+  }
+  
+  if( m_epOut.status() == USBERR_PROCESSING )
+  {
+    //Wait & retry
+    //m_timeout = true;
+    //m_txTimeout.attach_us(this, &UsbSerial::startTx, FLUSH_TMOUT);
+    DBG("Ep is busy...\n");
+    return;
+  }
+  
+  if( m_epOut.status() < 0 )
+  {
+    DBG("Tx trying again...\n");
+    m_epOut.transfer((volatile uint8_t*)m_outBufTrmt, m_outBufLen);
+    return;
+  }
+
+  m_outBufLen = m_pOutBufPos - m_outBufUsr;
+  
+  //Swap buffers
+  volatile char* swapBuf = m_outBufUsr;
+  m_outBufUsr = m_outBufTrmt;
+  m_outBufTrmt = swapBuf;
+  
+  m_epOut.transfer((volatile uint8_t*)m_outBufTrmt, m_outBufLen);
+  
+  m_pOutBufPos = m_outBufUsr;
+
+}
+
+void UsbSerial::startRx()
+{
+  if( (m_pInBufPos - m_inBufUsr) < m_inBufLen )
+  {
+    //User buf is not empty, cannot swap now...
+    return;
+  }
+  int len = m_epIn.status();
+  if( len == USBERR_PROCESSING )
+  {
+    //Previous transmission not completed
+    return;
+  }
+  if( len < 0 )
+  {
+    DBG("Rx trying again...\n");
+    m_epIn.transfer((volatile uint8_t*)m_inBufTrmt, BUF_LEN); //Start another transmission
+    return;
+  }
+  
+  m_inBufLen = len;
+  
+  //Swap buffers
+  volatile char* swapBuf = m_inBufUsr;
+  m_inBufUsr =  m_inBufTrmt;
+  m_inBufTrmt = swapBuf;
+  m_pInBufPos = m_inBufUsr;
+  
+  DBG("Starting new transfer\n");
+  m_epIn.transfer((volatile uint8_t*)m_inBufTrmt, BUF_LEN); //Start another transmission
+  
+}
+
+#ifdef MBED_RPC
+const struct rpc_method *UsbSerial::get_rpc_methods() { 
+    static const rpc_method methods[] = {
+        { "readable", rpc_method_caller<int, UsbSerial, &UsbSerial::readable> },
+        { "writeable", rpc_method_caller<int, UsbSerial, &UsbSerial::writeable> },
+        RPC_METHOD_SUPER(Stream)
+    };
+    return methods;
+}
+
+struct rpc_class *UsbSerial::get_rpc_class() {
+    static const rpc_function funcs[] = {
+        /*{ "new", rpc_function_caller<const char*, UsbDevice*, int, int, const char*, Base::construct<UsbSerial,UsbDevice*,int,int,const char*> > },*/ //RPC is buggy
+        RPC_METHOD_END
+    };
+    static rpc_class c = { "UsbSerial", funcs, NULL };
+    return &c;
+}
+#endif
+
+} // namespace mbed
+
+#endif
+