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   1 /*
   2  * Generic uart / rs232/ serial port library
   3  *
   4  * Copyright (c) 2013, Roel Verdult
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  * notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  * notice, this list of conditions and the following disclaimer in the
  13  * documentation and/or other materials provided with the distribution.
  14  * 3. Neither the name of the copyright holders nor the
  15  * names of its contributors may be used to endorse or promote products
  16  * derived from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
  19  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  20  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  21  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
  22  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  23  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  24  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  25  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  27  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  *
  29  * @file uart.h
  30  */
  31
  32 #ifndef _PM3_UART_H_
  33 #define _PM3_UART_H_
  34
  35 #include <stdio.h>
  36 #include <string.h>
  37 #include <stdlib.h>
  38
  39 #include <stdint.h>
  40 #include <stdbool.h>
  41
  42 typedef unsigned char byte_t;
  43
  44 /* serial_port is declared as a void*, which you should cast to whatever type
  45  * makes sense to your connection method. Both the posix and win32
  46  * implementations define their own structs in place.
  47  */
  48 typedef void* serial_port;
  49
  50 /* Returned by uart_open if the serial port specified was invalid.
  51  */
  52 #define INVALID_SERIAL_PORT (void*)(~1)
  53
  54 /* Returned by uart_open if the serial port specified is in use by another
  55  * process.
  56  */
  57 #define CLAIMED_SERIAL_PORT (void*)(~2)
  58
  59 /* Given a user-specified port name, connect to the port and return a structure
  60  * used for future references to that port.
  61  *
  62  * On errors, this method returns INVALID_SERIAL_PORT or CLAIMED_SERIAL_PORT.
  63  */
  64 serial_port uart_open(const char* pcPortName);
  65
  66 /* Closes the given port.
  67  */
  68 void uart_close(const serial_port sp);
  69
  70 /* Reads from the given serial port for up to 30ms.
  71  *   pbtRx: A pointer to a buffer for the returned data to be written to.
  72  *   pszMaxRxLen: The maximum data size we want to be sent.
  73  *   pszRxLen: The number of bytes that we were actually sent.
  74  *
  75  * Returns TRUE if any data was fetched, even if it was less than pszMaxRxLen.
  76  *
  77  * Returns FALSE if there was an error reading from the device. Note that a
  78  * partial read may have completed into the buffer by the corresponding
  79  * implementation, so pszRxLen should be checked to see if any data was written.
  80  */
  81 bool uart_receive(const serial_port sp, byte_t* pbtRx, size_t pszMaxRxLen, size_t* pszRxLen);
  82
  83 /* Sends a buffer to a given serial port.
  84  *   pbtTx: A pointer to a buffer containing the data to send.
  85  *   szTxLen: The amount of data to be sent.
  86  */
  87 bool uart_send(const serial_port sp, const byte_t* pbtTx, const size_t szTxLen);
  88
  89 /* Sets the current speed of the serial port, in baud.
  90  */
  91 bool uart_set_speed(serial_port sp, const uint32_t uiPortSpeed);
  92
  93 /* Gets the current speed of the serial port, in baud.
  94  */
  95 uint32_t uart_get_speed(const serial_port sp);
  96
  97 #endif // _PM3_UART_H_
  98