Jing Qiu / mbed

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Fork of mbed by gokmen ascioglu

SerialHalfDuplex.h@1:27d81db81dd7, 2015-03-03 (annotated)

Committer:
Jing_Qiu
Date:
Tue Mar 03 00:55:57 2015 +0000
Revision:
1:27d81db81dd7
Parent:
0:a8fa94490a0a 
revise

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gokmenascioglu 0:a8fa94490a0a 1 /* mbed Microcontroller Library - SerialHalfDuplex
gokmenascioglu 0:a8fa94490a0a 2 * Copyright (c) 2010-2011 ARM Limited. All rights reserved.
gokmenascioglu 0:a8fa94490a0a 3 */
gokmenascioglu 0:a8fa94490a0a 4
gokmenascioglu 0:a8fa94490a0a 5 #ifndef MBED_SERIALHALFDUPLEX_H
gokmenascioglu 0:a8fa94490a0a 6 #define MBED_SERIALHALFDUPLEX_H
gokmenascioglu 0:a8fa94490a0a 7
gokmenascioglu 0:a8fa94490a0a 8 #include "device.h"
gokmenascioglu 0:a8fa94490a0a 9
gokmenascioglu 0:a8fa94490a0a 10 #if DEVICE_SERIAL
gokmenascioglu 0:a8fa94490a0a 11
gokmenascioglu 0:a8fa94490a0a 12 #include "Serial.h"
gokmenascioglu 0:a8fa94490a0a 13 #include "PinNames.h"
gokmenascioglu 0:a8fa94490a0a 14 #include "PeripheralNames.h"
gokmenascioglu 0:a8fa94490a0a 15
gokmenascioglu 0:a8fa94490a0a 16 namespace mbed {
gokmenascioglu 0:a8fa94490a0a 17
gokmenascioglu 0:a8fa94490a0a 18 /* Class: SerialHalfDuplex
gokmenascioglu 0:a8fa94490a0a 19 * A serial port (UART) for communication with other devices using
gokmenascioglu 0:a8fa94490a0a 20 * Half-Duplex, allowing transmit and receive on a single
gokmenascioglu 0:a8fa94490a0a 21 * shared transmit and receive line. Only one end should be transmitting
gokmenascioglu 0:a8fa94490a0a 22 * at a time.
gokmenascioglu 0:a8fa94490a0a 23 *
gokmenascioglu 0:a8fa94490a0a 24 * Both the tx and rx pin should be defined, and wired together.
gokmenascioglu 0:a8fa94490a0a 25 * This is in addition to them being wired to the other serial
gokmenascioglu 0:a8fa94490a0a 26 * device to allow both read and write functions to operate.
gokmenascioglu 0:a8fa94490a0a 27 *
gokmenascioglu 0:a8fa94490a0a 28 * Example:
gokmenascioglu 0:a8fa94490a0a 29 * > // Send a byte to a second HalfDuplex device, and read the response
gokmenascioglu 0:a8fa94490a0a 30 * >
gokmenascioglu 0:a8fa94490a0a 31 * > #include "mbed.h"
gokmenascioglu 0:a8fa94490a0a 32 * >
gokmenascioglu 0:a8fa94490a0a 33 * > // p9 and p10 should be wired together to form "a"
gokmenascioglu 0:a8fa94490a0a 34 * > // p28 and p27 should be wired together to form "b"
gokmenascioglu 0:a8fa94490a0a 35 * > // p9/p10 should be wired to p28/p27 as the Half Duplex connection
gokmenascioglu 0:a8fa94490a0a 36 * >
gokmenascioglu 0:a8fa94490a0a 37 * > SerialHalfDuplex a(p9, p10);
gokmenascioglu 0:a8fa94490a0a 38 * > SerialHalfDuplex b(p28, p27);
gokmenascioglu 0:a8fa94490a0a 39 * >
gokmenascioglu 0:a8fa94490a0a 40 * > void b_rx() { // second device response
gokmenascioglu 0:a8fa94490a0a 41 * > b.putc(b.getc() + 4);
gokmenascioglu 0:a8fa94490a0a 42 * > }
gokmenascioglu 0:a8fa94490a0a 43 * >
gokmenascioglu 0:a8fa94490a0a 44 * > int main() {
gokmenascioglu 0:a8fa94490a0a 45 * > b.attach(&b_rx);
gokmenascioglu 0:a8fa94490a0a 46 * > for(int c = 'A'; c < 'Z'; c++) {
gokmenascioglu 0:a8fa94490a0a 47 * > a.putc(c);
gokmenascioglu 0:a8fa94490a0a 48 * > printf("sent [%c]\n", c);
gokmenascioglu 0:a8fa94490a0a 49 * > wait(0.5); // b should respond
gokmenascioglu 0:a8fa94490a0a 50 * > if(a.readable()) {
gokmenascioglu 0:a8fa94490a0a 51 * > printf("received [%c]\n", a.getc());
gokmenascioglu 0:a8fa94490a0a 52 * > }
gokmenascioglu 0:a8fa94490a0a 53 * > }
gokmenascioglu 0:a8fa94490a0a 54 * > }
gokmenascioglu 0:a8fa94490a0a 55 *
gokmenascioglu 0:a8fa94490a0a 56 * For Simplex and Full-Duplex Serial communication, see <Serial>
gokmenascioglu 0:a8fa94490a0a 57 */
gokmenascioglu 0:a8fa94490a0a 58 class SerialHalfDuplex : public Serial {
gokmenascioglu 0:a8fa94490a0a 59
gokmenascioglu 0:a8fa94490a0a 60 public:
gokmenascioglu 0:a8fa94490a0a 61 /* Constructor: SerialHalfDuplex
gokmenascioglu 0:a8fa94490a0a 62 * Create a half-duplex serial port, connected to the specified transmit
gokmenascioglu 0:a8fa94490a0a 63 * and receive pins.
gokmenascioglu 0:a8fa94490a0a 64 *
gokmenascioglu 0:a8fa94490a0a 65 * These pins should be wired together, as well as to the target device
gokmenascioglu 0:a8fa94490a0a 66 *
gokmenascioglu 0:a8fa94490a0a 67 * Variables:
gokmenascioglu 0:a8fa94490a0a 68 * tx - Transmit pin
gokmenascioglu 0:a8fa94490a0a 69 * rx - Receive pin
gokmenascioglu 0:a8fa94490a0a 70 */
gokmenascioglu 0:a8fa94490a0a 71 SerialHalfDuplex(PinName tx, PinName rx, const char *name = NULL);
gokmenascioglu 0:a8fa94490a0a 72
gokmenascioglu 0:a8fa94490a0a 73 #if 0 // Inherited from Serial class, for documentation
gokmenascioglu 0:a8fa94490a0a 74 /* Function: baud
gokmenascioglu 0:a8fa94490a0a 75 * Set the baud rate of the serial port
gokmenascioglu 0:a8fa94490a0a 76 *
gokmenascioglu 0:a8fa94490a0a 77 * Variables:
gokmenascioglu 0:a8fa94490a0a 78 * baudrate - The baudrate of the serial port (default = 9600).
gokmenascioglu 0:a8fa94490a0a 79 */
gokmenascioglu 0:a8fa94490a0a 80 void baud(int baudrate);
gokmenascioglu 0:a8fa94490a0a 81
gokmenascioglu 0:a8fa94490a0a 82 enum Parity {
gokmenascioglu 0:a8fa94490a0a 83 None = 0
gokmenascioglu 0:a8fa94490a0a 84 , Odd
gokmenascioglu 0:a8fa94490a0a 85 , Even
gokmenascioglu 0:a8fa94490a0a 86 , Forced1
gokmenascioglu 0:a8fa94490a0a 87 , Forced0
gokmenascioglu 0:a8fa94490a0a 88 };
gokmenascioglu 0:a8fa94490a0a 89
gokmenascioglu 0:a8fa94490a0a 90 /* Function: format
gokmenascioglu 0:a8fa94490a0a 91 * Set the transmission format used by the Serial port
gokmenascioglu 0:a8fa94490a0a 92 *
gokmenascioglu 0:a8fa94490a0a 93 * Variables:
gokmenascioglu 0:a8fa94490a0a 94 * bits - The number of bits in a word (5-8; default = 8)
gokmenascioglu 0:a8fa94490a0a 95 * parity - The parity used (Serial::None, Serial::Odd,
gokmenascioglu 0:a8fa94490a0a 96 Serial::Even, Serial::Forced1, Serial::Forced0; default = Serial::None)
gokmenascioglu 0:a8fa94490a0a 97 * stop - The number of stop bits (1 or 2; default = 1)
gokmenascioglu 0:a8fa94490a0a 98 */
gokmenascioglu 0:a8fa94490a0a 99 void format(int bits = 8, Parity parity = Serial::None, int stop_bits
gokmenascioglu 0:a8fa94490a0a 100 = 1);
gokmenascioglu 0:a8fa94490a0a 101
gokmenascioglu 0:a8fa94490a0a 102 /* Function: putc
gokmenascioglu 0:a8fa94490a0a 103 * Write a character
gokmenascioglu 0:a8fa94490a0a 104 *
gokmenascioglu 0:a8fa94490a0a 105 * Variables:
gokmenascioglu 0:a8fa94490a0a 106 * c - The character to write to the serial port
gokmenascioglu 0:a8fa94490a0a 107 */
gokmenascioglu 0:a8fa94490a0a 108 int putc(int c);
gokmenascioglu 0:a8fa94490a0a 109
gokmenascioglu 0:a8fa94490a0a 110 /* Function: getc
gokmenascioglu 0:a8fa94490a0a 111 * Read a character
gokmenascioglu 0:a8fa94490a0a 112 *
gokmenascioglu 0:a8fa94490a0a 113 * Read a character from the serial port. This call will block
gokmenascioglu 0:a8fa94490a0a 114 * until a character is available. For testing if a character is
gokmenascioglu 0:a8fa94490a0a 115 * available for reading, see <readable>.
gokmenascioglu 0:a8fa94490a0a 116 *
gokmenascioglu 0:a8fa94490a0a 117 * Variables:
gokmenascioglu 0:a8fa94490a0a 118 * returns - The character read from the serial port
gokmenascioglu 0:a8fa94490a0a 119 */
gokmenascioglu 0:a8fa94490a0a 120 int getc();
gokmenascioglu 0:a8fa94490a0a 121
gokmenascioglu 0:a8fa94490a0a 122 /* Function: printf
gokmenascioglu 0:a8fa94490a0a 123 * Write a formated string
gokmenascioglu 0:a8fa94490a0a 124 *
gokmenascioglu 0:a8fa94490a0a 125 * Variables:
gokmenascioglu 0:a8fa94490a0a 126 * format - A printf-style format string, followed by the
gokmenascioglu 0:a8fa94490a0a 127 * variables to use in formating the string.
gokmenascioglu 0:a8fa94490a0a 128 */
gokmenascioglu 0:a8fa94490a0a 129 int printf(const char* format, ...);
gokmenascioglu 0:a8fa94490a0a 130
gokmenascioglu 0:a8fa94490a0a 131 /* Function: scanf
gokmenascioglu 0:a8fa94490a0a 132 * Read a formated string
gokmenascioglu 0:a8fa94490a0a 133 *
gokmenascioglu 0:a8fa94490a0a 134 * Variables:
gokmenascioglu 0:a8fa94490a0a 135 * format - A scanf-style format string,
gokmenascioglu 0:a8fa94490a0a 136 * followed by the pointers to variables to store the results.
gokmenascioglu 0:a8fa94490a0a 137 */
gokmenascioglu 0:a8fa94490a0a 138 int scanf(const char* format, ...);
gokmenascioglu 0:a8fa94490a0a 139
gokmenascioglu 0:a8fa94490a0a 140 /* Function: readable
gokmenascioglu 0:a8fa94490a0a 141 * Determine if there is a character available to read
gokmenascioglu 0:a8fa94490a0a 142 *
gokmenascioglu 0:a8fa94490a0a 143 * Variables:
gokmenascioglu 0:a8fa94490a0a 144 * returns - 1 if there is a character available to read, else 0
gokmenascioglu 0:a8fa94490a0a 145 */
gokmenascioglu 0:a8fa94490a0a 146 int readable();
gokmenascioglu 0:a8fa94490a0a 147
gokmenascioglu 0:a8fa94490a0a 148 /* Function: writeable
gokmenascioglu 0:a8fa94490a0a 149 * Determine if there is space available to write a character
gokmenascioglu 0:a8fa94490a0a 150 *
gokmenascioglu 0:a8fa94490a0a 151 * Variables:
gokmenascioglu 0:a8fa94490a0a 152 * returns - 1 if there is space to write a character, else 0
gokmenascioglu 0:a8fa94490a0a 153 */
gokmenascioglu 0:a8fa94490a0a 154 int writeable();
gokmenascioglu 0:a8fa94490a0a 155
gokmenascioglu 0:a8fa94490a0a 156 /* Function: attach
gokmenascioglu 0:a8fa94490a0a 157 * Attach a function to call whenever a serial interrupt is generated
gokmenascioglu 0:a8fa94490a0a 158 *
gokmenascioglu 0:a8fa94490a0a 159 * Variables:
gokmenascioglu 0:a8fa94490a0a 160 * fptr - A pointer to a void function, or 0 to set as none
gokmenascioglu 0:a8fa94490a0a 161 */
gokmenascioglu 0:a8fa94490a0a 162 void attach(void (*fptr)(void));
gokmenascioglu 0:a8fa94490a0a 163
gokmenascioglu 0:a8fa94490a0a 164 /* Function: attach
gokmenascioglu 0:a8fa94490a0a 165 * Attach a member function to call whenever a serial interrupt is generated
gokmenascioglu 0:a8fa94490a0a 166 *
gokmenascioglu 0:a8fa94490a0a 167 * Variables:
gokmenascioglu 0:a8fa94490a0a 168 * tptr - pointer to the object to call the member function on
gokmenascioglu 0:a8fa94490a0a 169 * mptr - pointer to the member function to be called
gokmenascioglu 0:a8fa94490a0a 170 */
gokmenascioglu 0:a8fa94490a0a 171 template<typename T>
gokmenascioglu 0:a8fa94490a0a 172 void attach(T* tptr, void (T::*mptr)(void));
gokmenascioglu 0:a8fa94490a0a 173
gokmenascioglu 0:a8fa94490a0a 174 #endif
gokmenascioglu 0:a8fa94490a0a 175
gokmenascioglu 0:a8fa94490a0a 176 protected:
gokmenascioglu 0:a8fa94490a0a 177 PinName _txpin;
gokmenascioglu 0:a8fa94490a0a 178
gokmenascioglu 0:a8fa94490a0a 179 virtual int _putc(int c);
gokmenascioglu 0:a8fa94490a0a 180 virtual int _getc(void);
gokmenascioglu 0:a8fa94490a0a 181
gokmenascioglu 0:a8fa94490a0a 182 }; // End class SerialHalfDuplex
gokmenascioglu 0:a8fa94490a0a 183
gokmenascioglu 0:a8fa94490a0a 184 } // End namespace
gokmenascioglu 0:a8fa94490a0a 185
gokmenascioglu 0:a8fa94490a0a 186 #endif
gokmenascioglu 0:a8fa94490a0a 187
gokmenascioglu 0:a8fa94490a0a 188 #endif