113 lines
3.8 KiB
C
113 lines
3.8 KiB
C
/*
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* Copyright (c) 2017 Linaro Limited
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef ZEPHYR_INCLUDE_CONSOLE_CONSOLE_H_
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#define ZEPHYR_INCLUDE_CONSOLE_CONSOLE_H_
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#include <sys/types.h>
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#include <zephyr/types.h>
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#include <kernel.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** @brief Initialize console device.
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*
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* This function should be called once to initialize pull-style
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* access to console via console_getchar() function and buffered
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* output using console_putchar() function. This function supersedes,
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* and incompatible with, callback (push-style) console handling
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* (via console_input_fn callback, etc.).
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*
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* @return 0 on success, error code (<0) otherwise
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*/
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int console_init(void);
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/**
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* @brief Read data from console.
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*
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* @param dummy ignored, present to follow read() prototype
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* @param buf buffer to read data to
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* @param size maximum number of bytes to read
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* @return >0, number of actually read bytes (can be less than size param)
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* =0, in case of EOF
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* <0, in case of error (e.g. -EAGAIN if timeout expired). errno
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* variable is also set.
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*/
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ssize_t console_read(void *dummy, void *buf, size_t size);
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/**
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* @brief Write data to console.
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*
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* @param dummy ignored, present to follow write() prototype
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* @param buf buffer to write data to
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* @param size maximum number of bytes to write
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* @return =>0, number of actually written bytes (can be less than size param)
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* <0, in case of error (e.g. -EAGAIN if timeout expired). errno
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* variable is also set.
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*/
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ssize_t console_write(void *dummy, const void *buf, size_t size);
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/** @brief Get next char from console input buffer.
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*
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* Return next input character from console. If no characters available,
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* this function will block. This function is similar to ANSI C
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* getchar() function and is intended to ease porting of existing
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* software. Before this function can be used, console_init()
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* should be called once. This function is incompatible with native
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* Zephyr callback-based console input processing, shell subsystem,
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* or console_getline().
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*
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* @return 0-255: a character read, including control characters.
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* <0: error occurred.
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*/
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int console_getchar(void);
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/** @brief Output a char to console (buffered).
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*
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* Puts a character into console output buffer. It will be sent
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* to a console asynchronously, e.g. using an IRQ handler.
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*
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* @return <0 on error, otherwise 0.
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*/
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int console_putchar(char c);
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/** @brief Initialize console_getline() call.
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*
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* This function should be called once to initialize pull-style
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* access to console via console_getline() function. This function
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* supersedes, and incompatible with, callback (push-style) console
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* handling (via console_input_fn callback, etc.).
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*
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* @return N/A
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*/
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void console_getline_init(void);
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/** @brief Get next line from console input buffer.
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*
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* Return next input line from console. Until full line is available,
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* this function will block. This function is similar to ANSI C
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* gets() function (except a line is returned in system-owned buffer,
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* and system takes care of the buffer overflow checks) and is
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* intended to ease porting of existing software. Before this function
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* can be used, console_getline_init() should be called once. This
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* function is incompatible with native Zephyr callback-based console
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* input processing, shell subsystem, or console_getchar().
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*
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* @return A pointer to a line read, not including EOL character(s).
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* A line resides in a system-owned buffer, so an application
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* should finish any processing of this line immediately
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* after console_getline() call, or the buffer can be reused.
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*/
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char *console_getline(void);
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#ifdef __cplusplus
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}
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#endif
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#endif /* ZEPHYR_INCLUDE_CONSOLE_CONSOLE_H_ */
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