1 /*
2 * FreeRTOS Kernel V10.6.2
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 /*! \file *********************************************************************
31 *
32 * \brief System-specific implementation of the \ref __read function used by
33 the standard library.
34 *
35 * - Compiler: IAR EWAVR32
36 * - Supported devices: All AVR32 devices with a USART module can be used.
37 * - AppNote:
38 *
39 * \author Atmel Corporation (Now Microchip):
40 * https://www.microchip.com \n
41 * Support and FAQ: https://www.microchip.com/support/
42 *
43 ******************************************************************************/
44
45 /*
46 * Copyright (c) 2007, Atmel Corporation All rights reserved.
47 *
48 * Redistribution and use in source and binary forms, with or without
49 * modification, are permitted provided that the following conditions are met:
50 *
51 * 1. Redistributions of source code must retain the above copyright notice,
52 * this list of conditions and the following disclaimer.
53 *
54 * 2. Redistributions in binary form must reproduce the above copyright notice,
55 * this list of conditions and the following disclaimer in the documentation
56 * and/or other materials provided with the distribution.
57 *
58 * 3. The name of ATMEL may not be used to endorse or promote products derived
59 * from this software without specific prior written permission.
60 *
61 * THIS SOFTWARE IS PROVIDED BY ATMEL ``AS IS'' AND ANY EXPRESS OR IMPLIED
62 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
63 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY AND
64 * SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT,
65 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
66 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
67 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
68 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
69 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
70 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
71 */
72
73
74 #include <yfuns.h>
75 #include <avr32/io.h>
76 #include "usart.h"
77
78
79 _STD_BEGIN
80
81
82 #pragma module_name = "?__read"
83
84
85 extern volatile avr32_usart_t *volatile stdio_usart_base;
86
87
88 /*! \brief Reads a number of bytes, at most \a size, into the memory area
89 * pointed to by \a buffer.
90 *
91 * \param handle File handle to read from.
92 * \param buffer Pointer to buffer to write read bytes to.
93 * \param size Number of bytes to read.
94 *
95 * \return The number of bytes read, \c 0 at the end of the file, or
96 * \c _LLIO_ERROR on failure.
97 */
__read(int handle,uint8_t * buffer,size_t size)98 size_t __read(int handle, uint8_t *buffer, size_t size)
99 {
100 int nChars = 0;
101
102 // This implementation only reads from stdin.
103 // For all other file handles, it returns failure.
104 if (handle != _LLIO_STDIN)
105 {
106 return _LLIO_ERROR;
107 }
108
109 for (; size > 0; --size)
110 {
111 int c = usart_getchar(stdio_usart_base);
112 if (c < 0)
113 break;
114
115 *buffer++ = c;
116 ++nChars;
117 }
118
119 return nChars;
120 }
121
122
123 _STD_END
124
