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-rw-r--r-- | cpukit/include/rtems/dev/io.h | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/cpukit/include/rtems/dev/io.h b/cpukit/include/rtems/dev/io.h new file mode 100644 index 0000000000..b8bcde7af4 --- /dev/null +++ b/cpukit/include/rtems/dev/io.h @@ -0,0 +1,123 @@ +/* SPDX-License-Identifier: BSD-2-Clause */ + +/** + * @file + * + * @ingroup RTEMSDeviceIO + * + * @brief This header file provides the interfaces of the + * @ref RTEMSDeviceIO. + */ + +/* + * Copyright (C) 2017, 2023 embedded brains GmbH & Co. KG + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef _RTEMS_DEV_IO_H +#define _RTEMS_DEV_IO_H + +#include <rtems/score/basedefs.h> + +#include <stdarg.h> + +#ifdef __cplusplus +extern "C" { +#endif /* __cplusplus */ + +/** + * @defgroup RTEMSDeviceIO Device I/O Support + * + * @ingroup RTEMSDeviceDrivers + * + * @brief This group contains the Device I/O Support API and implementation. + * + * @{ + */ + +/** + * @brief This type defines the put character handler. + * + * @param c is the character to put. + * + * @param arg is the user-provided argument. + */ +typedef void ( *IO_Put_char )( int c, void *arg ); + +/** + * @brief Prints characters using the put character handler according to the + * format string. + * + * @param put_char is the put character handler. + * + * @param arg is the user-provided argument for the put character handler. + * + * @param fmt is the printf()-style format string. + * + * @param ... is the list of parameters required by the format string. + * + * @return Returns the count of put characters. + */ +int _IO_Printf( + IO_Put_char put_char, + void *arg, + char const *fmt, + ... +) RTEMS_PRINTFLIKE( 3, 4 ); + +/** + * @brief Prints characters using the put character handler according to the + * format string. + * + * @param put_char is the put character handler. + * + * @param arg is the user-provided argument for the put character handler. + * + * @param fmt is the printf()-style format string. + * + * @param ap is the argument list required by the format string. + * + * @return Returns the count of put characters. + */ +int _IO_Vprintf( + IO_Put_char put_char, + void *arg, + char const *fmt, + va_list ap +); + +/** + * @brief Issues a couple of no-operation instructions. + * + * This function may be used to burn a couple of processor cycles with minimum + * impact on the system bus. It may be used in busy wait loops. + */ +void _IO_Relax( void ); + +/** @} */ + +#ifdef __cplusplus +} +#endif /* __cplusplus */ + +#endif /* _RTEMS_DEV_IO_H */ |