Diff: BufferSerial/BufferSerial.h

Revision:

6:014b1a469aed

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/BufferSerial/BufferSerial.h	Tue Mar 02 10:09:10 2021 +0800
@@ -0,0 +1,154 @@
+
+/**
+ * @file    BufferSerial.h
+ * @brief   Software Buffer - Extends mbed Serial functionallity adding irq driven TX and RX
+ * @author  sam grove
+ * @version 1.0
+ * @see     
+ *
+ * Copyright (c) 2013
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef BUFFEREDSERIAL_H
+#define BUFFEREDSERIAL_H
+ 
+#include "mbed.h"
+#include "MyBuffer.h"
+
+#if (MBED_MAJOR_VERSION == 5) && (MBED_MINOR_VERSION >= 2)
+#elif (MBED_MAJOR_VERSION == 2) && (MBED_PATCH_VERSION > 130)
+#else
+//#error "BufferSerial version 13 and newer requires use of Mbed OS 5.2.0 and newer or Mbed 2 version 130 and newer. Use BufferSerial version 12 and older or upgrade the Mbed version.
+#endif
+
+/** A serial port (UART) for communication with other serial devices
+ *
+ * Can be used for Full Duplex communication, or Simplex by specifying
+ * one pin as NC (Not Connected)
+ *
+ * Example:
+ * @code
+ *  #include "mbed.h"
+ *  #include "BufferSerial.h"
+ *
+ *  BufferSerial pc(USBTX, USBRX);
+ *
+ *  int main()
+ *  { 
+ *      while(1)
+ *      {
+ *          Timer s;
+ *        
+ *          s.start();
+ *          pc.printf("Hello World - buffer\n");
+ *          int buffer_time = s.read_us();
+ *          wait(0.1f); // give time for the buffer to empty
+ *        
+ *          s.reset();
+ *          printf("Hello World - blocking\n");
+ *          int polled_time = s.read_us();
+ *          s.stop();
+ *          wait(0.1f); // give time for the buffer to empty
+ *        
+ *          pc.printf("printf buffer took %d us\n", buffer_time);
+ *          pc.printf("printf blocking took %d us\n", polled_time);
+ *          wait(0.5f);
+ *      }
+ *  }
+ * @endcode
+ */
+
+/**
+ *  @class BufferSerial
+ *  @brief Software buffers and interrupt driven tx and rx for Serial
+ */  
+
+#if MBED_MAJOR_VERSION >= 6 
+#include "MyUnbufferedSerial.h"
+class BufferSerial : public MyUnbufferedSerial
+{
+#else
+class BufferSerial : public RawSerial 
+{
+#endif
+
+private:
+    MyBuffer <char> _rxbuf;
+    MyBuffer <char> _txbuf;
+    uint32_t      _buf_size;
+    uint32_t      _tx_multiple;
+ 
+    void rxIrq(void);
+    void txIrq(void);
+    void prime(void);
+    
+public:
+    /** Create a BufferSerial port, connected to the specified transmit and receive pins
+     *  @param tx Transmit pin
+     *  @param rx Receive pin
+     *  @param buf_size printf() buffer size
+     *  @param tx_multiple amount of max printf() present in the internal ring buffer at one time
+     *  @param name optional name
+     *  @note Either tx or rx may be specified as NC if unused
+     */
+    BufferSerial(PinName tx, PinName rx, uint32_t buf_size = 256, uint32_t tx_multiple = 4,const char* name=NULL);
+    
+    /** Destroy a BufferSerial port
+     */
+    virtual ~BufferSerial(void);
+    
+    /** Check on how many bytes are in the rx buffer
+     *  @return 1 if something exists, 0 otherwise
+     */
+    virtual int readable(void);
+    
+    /** Check to see if the tx buffer has room
+     *  @return 1 always has room and can overwrite previous content if too small / slow
+     */
+    virtual int writeable(void);
+    
+    /** Get a single byte from the BufferSerial Port.
+     *  Should check readable() before calling this.
+     *  @return A byte that came in on the Serial Port
+     */
+    virtual int getc(void);
+    
+    /** Write a single byte to the BufferSerial Port.
+     *  @param c The byte to write to the Serial Port
+     *  @return The byte that was written to the Serial Port Buffer
+     */
+    virtual int putc(int c);
+    
+    /** Write a string to the BufferSerial Port. Must be NULL terminated
+     *  @param s The string to write to the Serial Port
+     *  @return The number of bytes written to the Serial Port Buffer
+     */
+    virtual int puts(const char *s);
+    
+    /** Write a formatted string to the BufferSerial Port.
+     *  @param format The string + format specifiers to write to the Serial Port
+     *  @return The number of bytes written to the Serial Port Buffer
+     */
+    virtual int printf(const char* format, ...);
+    
+    /** Write data to the Buffer Serial Port
+     *  @param s A pointer to data to send
+     *  @param length The amount of data being pointed to
+     *  @return The number of bytes written to the Serial Port Buffer
+     */
+    virtual ssize_t write(const void *s, std::size_t length);
+};
+
+#endif