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UsbSerial.cpp
00001 00002 /* 00003 Copyright (c) 2010 Donatien Garnier (donatiengar [at] gmail [dot] com) 00004 00005 Permission is hereby granted, free of charge, to any person obtaining a copy 00006 of this software and associated documentation files (the "Software"), to deal 00007 in the Software without restriction, including without limitation the rights 00008 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 00009 copies of the Software, and to permit persons to whom the Software is 00010 furnished to do so, subject to the following conditions: 00011 00012 The above copyright notice and this permission notice shall be included in 00013 all copies or substantial portions of the Software. 00014 00015 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 00016 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 00017 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 00018 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 00019 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 00020 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 00021 THE SOFTWARE. 00022 */ 00023 00024 #include "UsbSerial.h" 00025 #include "usbserialif.h" 00026 #include "rpc.h" 00027 00028 #include "netCfg.h" 00029 #if NET_USB_SERIAL 00030 00031 namespace mbed { 00032 00033 #define BUF_LEN 64 00034 #define FLUSH_TMOUT 10000 //US 00035 00036 UsbSerial::UsbSerial(int usbDev, int usbIf, const char *name /*= NULL*/) : Stream(name), m_txTimeout() { 00037 m_inBufEven = new char[BUF_LEN]; 00038 m_inBufOdd = new char[BUF_LEN]; 00039 m_pInBufPos = m_inBufUsr = m_inBufEven; 00040 m_inBufTrmt = m_inBufOdd; 00041 00042 m_outBufEven = new char[BUF_LEN]; 00043 m_outBufOdd = new char[BUF_LEN]; 00044 m_pOutBufPos = m_outBufUsr = m_outBufEven; 00045 m_outBufTrmt = m_outBufOdd; 00046 00047 m_inBufLen = m_outBufLen = 0; 00048 00049 // startRx(); 00050 } 00051 00052 UsbSerial::~UsbSerial() 00053 { 00054 delete[] m_inBufEven; 00055 delete[] m_inBufOdd; 00056 delete[] m_outBufEven; 00057 delete[] m_outBufOdd; 00058 } 00059 00060 void UsbSerial::baud(int baudrate) { 00061 // 00062 } 00063 00064 void UsbSerial::format(int bits, int parity, int stop) { 00065 // 00066 } 00067 00068 int UsbSerial::_getc() { 00069 char c; 00070 c = *m_pInBufPos; 00071 m_pInBufPos++; 00072 return c; 00073 } 00074 00075 int UsbSerial::_putc(int c) { 00076 m_txTimeout.detach(); //Do not want to be interrupted, accessing shared data here... 00077 *m_pOutBufPos = (char) c; 00078 m_pOutBufPos++; 00079 if( (m_pOutBufPos - m_outBufUsr) == BUF_LEN) //Must flush 00080 { 00081 startTx(); 00082 } 00083 else 00084 { 00085 m_txTimeout.attach_us(this, &UsbSerial::startTx, FLUSH_TMOUT); 00086 } 00087 return c; 00088 } 00089 00090 int UsbSerial::readable() { 00091 if( (m_pInBufPos - m_inBufUsr) < m_inBufLen ) 00092 { 00093 // printf("\r\nREADABLE\r\n"); 00094 return true; 00095 } 00096 else 00097 { 00098 // printf("\r\nNOT READABLE\r\n"); 00099 startRx(); //Try to swap packets & start another transmission 00100 return ((m_pInBufPos - m_inBufUsr) < m_inBufLen )?true:false; 00101 } 00102 } 00103 00104 int UsbSerial::writeable() { 00105 // printf("\r\nWRITEABLE???\r\n"); 00106 return (bool)( (m_pOutBufPos - m_outBufUsr) < BUF_LEN); 00107 } 00108 00109 00110 void UsbSerial::startTx() 00111 { 00112 if( SerialTransmitted() < 0 ) 00113 { 00114 //Wait & retry 00115 m_txTimeout.attach_us(this, &UsbSerial::startTx, FLUSH_TMOUT); 00116 return; 00117 } 00118 00119 m_outBufLen = m_pOutBufPos - m_outBufUsr; 00120 00121 //Swap buffers 00122 volatile char* swapBuf = m_outBufUsr; 00123 m_outBufUsr = m_outBufTrmt; 00124 m_outBufTrmt = swapBuf; 00125 00126 SerialTx((volatile USB_INT08U*)m_outBufTrmt, m_outBufLen); 00127 00128 m_pOutBufPos = m_outBufUsr; 00129 00130 } 00131 00132 void UsbSerial::startRx() 00133 { 00134 if( (m_pInBufPos - m_inBufUsr) < m_inBufLen ) 00135 { 00136 //User buf is not empty, cannot swap now... 00137 return; 00138 } 00139 int len = SerialReceived(); 00140 if( len < 0 ) 00141 { 00142 //Previous transmission not completed 00143 return; 00144 } 00145 00146 m_inBufLen = len; 00147 00148 //Swap buffers 00149 volatile char* swapBuf = m_inBufUsr; 00150 m_inBufUsr = m_inBufTrmt; 00151 m_inBufTrmt = swapBuf; 00152 00153 SerialRx((volatile USB_INT08U*)m_inBufTrmt, BUF_LEN); //Start another transmission 00154 00155 m_pInBufPos = m_inBufUsr; 00156 00157 } 00158 00159 00160 00161 const struct rpc_method *UsbSerial::get_rpc_methods() { 00162 static const rpc_method methods[] = { 00163 { "baud", rpc_method_caller<UsbSerial, int, &UsbSerial::baud> }, 00164 { "format", rpc_method_caller<UsbSerial, int, int, int, &UsbSerial::format> }, 00165 { "readable", rpc_method_caller<int, UsbSerial, &UsbSerial::readable> }, 00166 { "writeable", rpc_method_caller<int, UsbSerial, &UsbSerial::writeable> }, 00167 RPC_METHOD_SUPER(Stream) 00168 }; 00169 return methods; 00170 } 00171 00172 struct rpc_class *UsbSerial::get_rpc_class() { 00173 static const rpc_function funcs[] = { 00174 { "new", rpc_function_caller<const char*, int, int, const char*, Base::construct<UsbSerial,int,int,const char*> > }, 00175 RPC_METHOD_END 00176 }; 00177 static rpc_class c = { "UsbSerial", funcs, NULL }; 00178 return &c; 00179 } 00180 00181 } // namespace mbed 00182 00183 #endif 00184
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