4a9440dd62
- all messages are stored in a ring buffer - new devices (e.g. UART) are able to print previous messages
67 lines
2.2 KiB
C
67 lines
2.2 KiB
C
/*
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* Copyright (c) 2014, Stefan Lankes, Daniel Krebs, RWTH Aachen University
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* @author Stefan Lankes
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* @file arch/x86/include/asm/uart.h
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* @brief UART related code
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*/
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#ifndef __ARCH_UART_H__
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#define __ARCH_UART_H__
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#include <eduos/stddef.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** @brief Initialize UART output
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*
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* @return Returns 0 on success
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*/
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int uart_init(void);
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/** @brief Simple string output on a serial device.
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*
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* If you want a new line you will have to "\\n".
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*
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* @return Length of output in bytes
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*/
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int uart_puts(const char *text);
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/** @brief Simple character output on a serial device.
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*
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* @return The original input character casted to int
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*/
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int uart_putchar(unsigned char c);
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#ifdef __cplusplus
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}
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#endif
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#endif
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