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/*
* Copyright (C) 2016 Michael Andersen <m.andersen@berkeley.edu>
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @defgroup sys_rtt_stdio SEGGER RTT stdio
* @ingroup sys
*
* @brief stdio init/read/write functions for SEGGER RTT. This is
* designed to shadow the functions in uart_stdio
*
* @{
* @file
*
* @author Michael Andersen <m.andersen@cs.berkeley.edu>
*/
#ifndef RTT_STDIO_H
#define RTT_STDIO_H
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief initialize the module. This is a noop.
*/
void uart_stdio_init(void);
/**
* @brief read @p len bytes from stdio uart into @p buffer
*
* @param[out] buffer buffer to read into
* @param[in] len nr of bytes to read
*
* @return nr of bytes read
* @return <0 on error
*/
int uart_stdio_read(char* buffer, int len);
/**
* @brief write @p len bytes from @p buffer into uart
*
* @param[in] buffer buffer to read from
* @param[in] len nr of bytes to write
*
* @return nr of bytes written
* @return <0 on error
*/
int uart_stdio_write(const char* buffer, int len);
/**
* @brief enable stdin polling, at a power consumption cost. This is enabled
* by default unless RTT_STDIO_DISABLE_STDIN is defined.
*/
void rtt_stdio_enable_stdin(void);
/**
* @brief enable stdout blocking and free space polling. This must be done
* with caution because if there is no RTT client attached, all
* writes to stdout will block indefinitely. This can be enabled
* automatically by defining RTT_STDIO_ENABLE_BLOCKING_STDOUT
*/
void rtt_stdio_enable_blocking_stdout(void);
#ifdef __cplusplus
}
#endif
/** @} */
#endif /* RTT_STDIO_H */
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