Inherit from Serial and use software buffers for TX and RX. This allows the UART peripherals to operate in a IRQ driven mode. Overrides most (but not all) stdio functions as Serial did
Fork of BufferedSerial by
BufferedSerial.h
00001 00002 /** 00003 * @file BufferedSerial.h 00004 * @brief Software Buffer - Extends mbed Serial functionallity adding irq driven TX and RX 00005 * @author sam grove 00006 * @version 1.0 00007 * @see 00008 * 00009 * Copyright (c) 2013 00010 * 00011 * Licensed under the Apache License, Version 2.0 (the "License"); 00012 * you may not use this file except in compliance with the License. 00013 * You may obtain a copy of the License at 00014 * 00015 * http://www.apache.org/licenses/LICENSE-2.0 00016 * 00017 * Unless required by applicable law or agreed to in writing, software 00018 * distributed under the License is distributed on an "AS IS" BASIS, 00019 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 00020 * See the License for the specific language governing permissions and 00021 * limitations under the License. 00022 */ 00023 00024 #ifndef BUFFEREDSERIAL_H 00025 #define BUFFEREDSERIAL_H 00026 00027 #include "mbed.h" 00028 #include "Buffer.h" 00029 00030 // Base Class 00031 #define SERIAL_BASE RawSerial 00032 00033 /** A serial port (UART) for communication with other serial devices 00034 * 00035 * Can be used for Full Duplex communication, or Simplex by specifying 00036 * one pin as NC (Not Connected) 00037 * 00038 * Example: 00039 * @code 00040 * #include "mbed.h" 00041 * #include "BufferedSerial.h" 00042 * 00043 * BufferedSerial pc(USBTX, USBRX); 00044 * 00045 * int main() 00046 * { 00047 * while(1) 00048 * { 00049 * Timer s; 00050 * 00051 * s.start(); 00052 * pc.printf("Hello World - buffered\n"); 00053 * int buffered_time = s.read_us(); 00054 * wait(0.1f); // give time for the buffer to empty 00055 * 00056 * s.reset(); 00057 * printf("Hello World - blocking\n"); 00058 * int polled_time = s.read_us(); 00059 * s.stop(); 00060 * wait(0.1f); // give time for the buffer to empty 00061 * 00062 * pc.printf("printf buffered took %d us\n", buffered_time); 00063 * pc.printf("printf blocking took %d us\n", polled_time); 00064 * wait(0.5f); 00065 * } 00066 * } 00067 * @endcode 00068 */ 00069 00070 /** 00071 * @class BufferedSerial 00072 * @brief Software buffers and interrupt driven tx and rx for Serial 00073 */ 00074 class BufferedSerial : public SERIAL_BASE 00075 { 00076 private: 00077 Buffer <char> _rxbuf; 00078 Buffer <char> _txbuf; 00079 uint32_t _buf_size; 00080 uint32_t _tx_multiple; 00081 00082 void rxIrq(void); 00083 void txIrq(void); 00084 void prime(void); 00085 00086 public: 00087 /** Create a BufferedSerial port, connected to the specified transmit and receive pins 00088 * @param tx Transmit pin 00089 * @param rx Receive pin 00090 * @param buf_size printf() buffer size 00091 * @param tx_multiple amount of max printf() present in the internal ring buffer at one time 00092 * @param name optional name 00093 * @note Either tx or rx may be specified as NC if unused 00094 */ 00095 BufferedSerial(PinName tx, PinName rx, uint32_t buf_size = 256, uint32_t tx_multiple = 4,const char* name=NULL); 00096 00097 /** Destroy a BufferedSerial port 00098 */ 00099 virtual ~BufferedSerial(void); 00100 00101 /** Check on how many bytes are in the rx buffer 00102 * @return 1 if something exists, 0 otherwise 00103 */ 00104 virtual int readable(void); 00105 00106 /** Check to see if the tx buffer has room 00107 * @return 1 always has room and can overwrite previous content if too small / slow 00108 */ 00109 virtual int writeable(void); 00110 00111 /** Get a single byte from the BufferedSerial Port. 00112 * Should check readable() before calling this. 00113 * @return A byte that came in on the Serial Port 00114 */ 00115 virtual int getc(void); 00116 00117 /** 00118 * Read a line from the BufferedSerial Port. 00119 * @param s The string buffer to read from Serial Port 00120 * @param size the max number to read from Serial Port 00121 * @return the string read from Serial Port 00122 */ 00123 char* readl(char *s, int size); 00124 00125 /** Write a single byte to the BufferedSerial Port. 00126 * @param c The byte to write to the Serial Port 00127 * @return The byte that was written to the Serial Port Buffer 00128 */ 00129 virtual int putc(int c); 00130 00131 /** Write a string to the BufferedSerial Port. Must be NULL terminated 00132 * @param s The string to write to the Serial Port 00133 * @return The number of bytes written to the Serial Port Buffer 00134 */ 00135 virtual int puts(const char *s); 00136 00137 /** Write a formatted string to the BufferedSerial Port. 00138 * @param format The string + format specifiers to write to the Serial Port 00139 * @return The number of bytes written to the Serial Port Buffer 00140 */ 00141 virtual int printf(const char* format, ...); 00142 00143 /** Write data to the Buffered Serial Port 00144 * @param s A pointer to data to send 00145 * @param length The amount of data being pointed to 00146 * @return The number of bytes written to the Serial Port Buffer 00147 */ 00148 virtual ssize_t write(const void *s, std::size_t length); 00149 }; 00150 00151 #endif
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