1 /*
2 * FreeRTOS Kernel V11.1.0
3 * Copyright (C) 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
4 *
5 * SPDX-License-Identifier: MIT AND BSD-3-Clause
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a copy of
8 * this software and associated documentation files (the "Software"), to deal in
9 * the Software without restriction, including without limitation the rights to
10 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
11 * the Software, and to permit persons to whom the Software is furnished to do so,
12 * subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included in all
15 * copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
19 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
20 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
21 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23 *
24 * https://www.FreeRTOS.org
25 * https://github.com/FreeRTOS
26 *
27 */
28
29 /*This file is prepared for Doxygen automatic documentation generation.*/
30
31 /*! \file *********************************************************************
32 *
33 * \brief System-specific implementation of the \ref __read function used by
34 * the standard library.
35 *
36 * - Compiler: IAR EWAVR32
37 * - Supported devices: All AVR32 devices with a USART module can be used.
38 * - AppNote:
39 *
40 * \author Atmel Corporation (Now Microchip):
41 * https://www.microchip.com \n
42 * Support and FAQ: https://www.microchip.com/support/
43 *
44 ******************************************************************************/
45
46 /*
47 * Copyright (c) 2007, Atmel Corporation All rights reserved.
48 *
49 * Redistribution and use in source and binary forms, with or without
50 * modification, are permitted provided that the following conditions are met:
51 *
52 * 1. Redistributions of source code must retain the above copyright notice,
53 * this list of conditions and the following disclaimer.
54 *
55 * 2. Redistributions in binary form must reproduce the above copyright notice,
56 * this list of conditions and the following disclaimer in the documentation
57 * and/or other materials provided with the distribution.
58 *
59 * 3. The name of ATMEL may not be used to endorse or promote products derived
60 * from this software without specific prior written permission.
61 *
62 * THIS SOFTWARE IS PROVIDED BY ATMEL ``AS IS'' AND ANY EXPRESS OR IMPLIED
63 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
64 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY AND
65 * SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT,
66 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
67 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
68 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
69 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
70 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
71 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
72 */
73
74
75 #include <yfuns.h>
76 #include <avr32/io.h>
77 #include "usart.h"
78
79
80 _STD_BEGIN
81
82
83 #pragma module_name = "?__read"
84
85
86 extern volatile avr32_usart_t * volatile stdio_usart_base;
87
88
89 /*! \brief Reads a number of bytes, at most \a size, into the memory area
90 * pointed to by \a buffer.
91 *
92 * \param handle File handle to read from.
93 * \param buffer Pointer to buffer to write read bytes to.
94 * \param size Number of bytes to read.
95 *
96 * \return The number of bytes read, \c 0 at the end of the file, or
97 * \c _LLIO_ERROR on failure.
98 */
__read(int handle,uint8_t * buffer,size_t size)99 size_t __read( int handle,
100 uint8_t * buffer,
101 size_t size )
102 {
103 int nChars = 0;
104
105 /* This implementation only reads from stdin. */
106 /* For all other file handles, it returns failure. */
107 if( handle != _LLIO_STDIN )
108 {
109 return _LLIO_ERROR;
110 }
111
112 for( ; size > 0; --size )
113 {
114 int c = usart_getchar( stdio_usart_base );
115
116 if( c < 0 )
117 {
118 break;
119 }
120
121 *buffer++ = c;
122 ++nChars;
123 }
124
125 return nChars;
126 }
127
128
129 _STD_END
130
