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 __write 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 = "?__write"
84
85
86 /*! Pointer to the base of the USART module instance to use for stdio. */
87 __no_init volatile avr32_usart_t * volatile stdio_usart_base;
88
89
90 /*! \brief Writes a number of bytes, at most \a size, from the memory area
91 * pointed to by \a buffer.
92 *
93 * If \a buffer is zero then \ref __write performs flushing of internal buffers,
94 * if any. In this case, \a handle can be \c -1 to indicate that all handles
95 * should be flushed.
96 *
97 * \param handle File handle to write to.
98 * \param buffer Pointer to buffer to read bytes to write from.
99 * \param size Number of bytes to write.
100 *
101 * \return The number of bytes written, or \c _LLIO_ERROR on failure.
102 */
__write(int handle,const uint8_t * buffer,size_t size)103 size_t __write( int handle,
104 const uint8_t * buffer,
105 size_t size )
106 {
107 size_t nChars = 0;
108
109 if( buffer == 0 )
110 {
111 /* This means that we should flush internal buffers. */
112 return 0;
113 }
114
115 /* This implementation only writes to stdout and stderr. */
116 /* For all other file handles, it returns failure. */
117 if( ( handle != _LLIO_STDOUT ) && ( handle != _LLIO_STDERR ) )
118 {
119 return _LLIO_ERROR;
120 }
121
122 for( ; size != 0; --size )
123 {
124 if( usart_putchar( stdio_usart_base, *buffer++ ) < 0 )
125 {
126 return _LLIO_ERROR;
127 }
128
129 ++nChars;
130 }
131
132 return nChars;
133 }
134
135
136 _STD_END
137
