| /* |
| * Author: Thomas Ingleby <thomas.c.ingleby@intel.com> |
| * Contributions: Jon Trulson <jtrulson@ics.com> |
| * Brendan Le Foll <brendan.le.foll@intel.com> |
| * Copyright (c) 2014 - 2015 Intel Corporation |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining |
| * a copy of this software and associated documentation files (the |
| * "Software"), to deal in the Software without restriction, including |
| * without limitation the rights to use, copy, modify, merge, publish, |
| * distribute, sublicense, and/or sell copies of the Software, and to |
| * permit persons to whom the Software is furnished to do so, subject to |
| * the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be |
| * included in all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE |
| * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION |
| * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
| * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| */ |
| |
| #pragma once |
| |
| /** |
| * @file |
| * @brief UART module |
| * |
| * UART is the Universal asynchronous receiver/transmitter interface to |
| * libmraa. It allows the exposure of UART pins on supported boards. |
| * With functionality to expand at a later date. |
| * |
| * @snippet uart.c Interesting |
| */ |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| #include <stdio.h> |
| |
| #include "common.h" |
| |
| typedef struct _uart* mraa_uart_context; |
| |
| /** |
| * Initialise uart_context, uses board mapping |
| * |
| * @param uart the index of the uart set to use |
| * @return uart context or NULL |
| */ |
| mraa_uart_context mraa_uart_init(int uart); |
| |
| /** |
| * Initialise a raw uart_context. No board setup. |
| * |
| * @param path for example "/dev/ttyS0" |
| * @return uart context or NULL |
| */ |
| mraa_uart_context mraa_uart_init_raw(const char* path); |
| |
| /** |
| * Flush the outbound data. |
| * Blocks until complete. |
| * |
| * @param dev The UART context |
| * @return Result of operation |
| */ |
| mraa_result_t mraa_uart_flush(mraa_uart_context dev); |
| |
| /** |
| * Set the baudrate. |
| * Takes an int and will attempt to decide what baudrate is |
| * to be used on the UART hardware. |
| * |
| * @param dev The UART context |
| * @param baud unsigned int of baudrate i.e. 9600 |
| * @return Result of operation |
| */ |
| mraa_result_t mraa_uart_set_baudrate(mraa_uart_context dev, unsigned int baud); |
| |
| /** |
| * Set the transfer mode |
| * For example setting the mode to 8N1 would be |
| * "mraa_uart_set_mode(dev, 8,MRAA_UART_PARITY_NONE , 1)" |
| * |
| * @param dev The UART context |
| * @param bytesize data bits |
| * @param parity Parity bit setting |
| * @param stopbits stop bits |
| * @return Result of operation |
| */ |
| mraa_result_t mraa_uart_set_mode(mraa_uart_context dev, int bytesize, mraa_uart_parity_t parity, int stopbits); |
| |
| /** |
| * Set the flowcontrol |
| * |
| * @param dev The UART context |
| * @param xonxoff XON/XOFF Software flow control. |
| * @param rtscts RTS/CTS out of band hardware flow control |
| * @return Result of operation |
| */ |
| mraa_result_t mraa_uart_set_flowcontrol(mraa_uart_context dev, mraa_boolean_t xonxoff, mraa_boolean_t rtscts); |
| |
| /** |
| * Set the timeout for read and write operations |
| * <= 0 will disable that timeout |
| * |
| * @param dev The UART context |
| * @param read read timeout |
| * @param write write timeout |
| * @param interchar inbetween char timeout |
| * @return Result of operation |
| */ |
| mraa_result_t mraa_uart_set_timeout(mraa_uart_context dev, int read, int write, int interchar); |
| |
| /** |
| * Get Char pointer with tty device path within Linux |
| * For example. Could point to "/dev/ttyS0" |
| * |
| * @param dev uart context |
| * @return char pointer of device path |
| */ |
| const char* mraa_uart_get_dev_path(mraa_uart_context dev); |
| |
| /** |
| * Destroy a mraa_uart_context |
| * |
| * @param dev uart context |
| * @return mraa_result_t |
| */ |
| mraa_result_t mraa_uart_stop(mraa_uart_context dev); |
| |
| /** |
| * Read bytes from the device into a buffer |
| * |
| * @param dev uart context |
| * @param buf buffer pointer |
| * @param length maximum size of buffer |
| * @return the number of bytes read, or -1 if an error occurred |
| */ |
| int mraa_uart_read(mraa_uart_context dev, char* buf, size_t length); |
| |
| /** |
| * Write bytes in buffer to a device |
| * |
| * @param dev uart context |
| * @param buf buffer pointer |
| * @param length maximum size of buffer |
| * @return the number of bytes written, or -1 if an error occurred |
| */ |
| int mraa_uart_write(mraa_uart_context dev, const char* buf, size_t length); |
| |
| /** |
| * Check to see if data is available on the device for reading |
| * |
| * @param dev uart context |
| * @param millis number of milliseconds to wait, or 0 to return immediately |
| * @return 1 if there is data available to read, 0 otherwise |
| */ |
| mraa_boolean_t mraa_uart_data_available(mraa_uart_context dev, unsigned int millis); |
| |
| #ifdef __cplusplus |
| } |
| #endif |