119 lines
3.6 KiB
C
119 lines
3.6 KiB
C
/*
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* Author: Thomas Ingleby <thomas.c.ingleby@intel.com>
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* Contributions: Jon Trulson <jtrulson@ics.com>
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* Brendan Le Foll <brendan.le.foll@intel.com>
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* Copyright (c) 2014 - 2015 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#pragma once
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/**
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* @file
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* @brief UART module
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*
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* UART is the Universal asynchronous receiver/transmitter interface to
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* libmraa. It allows the exposure of UART pins on supported boards.
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* With functionality to expand at a later date.
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*
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* @snippet uart_setup.c Interesting
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdio.h>
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#include "common.h"
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typedef struct _uart* mraa_uart_context;
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/**
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* Initialise uart_context, uses board mapping
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*
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* @param uart the index of the uart set to use
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* @return uart context or NULL
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*/
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mraa_uart_context mraa_uart_init(int uart);
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mraa_uart_context mraa_uart_init_raw(int uart);
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mraa_result_t mraa_uart_flush(mraa_uart_context);
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mraa_result_t mraa_uart_set_baudrate(mraa_uart_context dev, unsigned int baud);
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mraa_result_t mraa_uart_set_mode(mraa_uart_context dev, int bytesize, mraa_uart_parity_t parity, int stopbits);
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mraa_result_t mraa_uart_set_flowcontrol(mraa_uart_context dev, mraa_boolean_t xonxoff, mraa_boolean_t rtscts);
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mraa_result_t mraa_uart_set_timeout(mraa_uart_context dev, int read, int write, int interchar);
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/**
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* Get Char pointer with tty device path within Linux
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* For example. Could point to "/dev/ttyS0"
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*
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* @param dev uart context
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* @return char pointer of device path
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*/
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char* mraa_uart_get_dev_path(mraa_uart_context dev);
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/**
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* Destroy a mraa_uart_context
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*
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* @param dev uart context
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* @return mraa_result_t
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*/
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mraa_result_t mraa_uart_stop(mraa_uart_context dev);
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/**
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* Read bytes from the device into a buffer
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*
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* @param dev uart context
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* @param buf buffer pointer
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* @param len maximum size of buffer
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* @return the number of bytes read, or -1 if an error occurred
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*/
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int mraa_uart_read(mraa_uart_context dev, char* buf, size_t len);
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/**
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* Write bytes in buffer to a device
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*
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* @param dev uart context
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* @param buf buffer pointer
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* @param len maximum size of buffer
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* @return the number of bytes written, or -1 if an error occurred
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*/
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int mraa_uart_write(mraa_uart_context dev, char* buf, size_t len);
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/**
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* Check to see if data is available on the device for reading
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*
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* @param dev uart context
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* @param millis number of milliseconds to wait, or 0 to return immediately
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* @return 1 if there is data available to read, 0 otherwise
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*/
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mraa_boolean_t mraa_uart_data_available(mraa_uart_context dev, unsigned int millis);
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#ifdef __cplusplus
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}
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#endif
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