111 lines
3.7 KiB
C
111 lines
3.7 KiB
C
/*
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Cubesat Space Protocol - A small network-layer protocol designed for Cubesats
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Copyright (C) 2012 GomSpace ApS (http://www.gomspace.com)
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Copyright (C) 2012 AAUSAT3 Project (http://aausat3.space.aau.dk)
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _CSP_IF_KISS_H_
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#define _CSP_IF_KISS_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdint.h>
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#include <csp/csp.h>
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#include <csp/csp_interface.h>
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/**
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* The KISS interface relies on the USART callback in order to parse incoming
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* messaged from the serial interface. The USART callback however does not
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* support passing the handle number of the responding USART, so you need to implement
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* a USART callback for each handle and then call kiss_rx subsequently.
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*
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* In order to initialize the KISS interface. Fist call kiss_init() and then
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* setup your usart to call csp_kiss_rx when new data is available.
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*
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* When a byte is not a part of a kiss packet, it will be returned to your
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* usart driver using the usart_insert funtion that you provide.
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*
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* @param csp_iface pointer to interface
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* @param buf pointer to incoming data
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* @param len length of incoming data
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* @param pxTaskWoken NULL if task context, pointer to variable if ISR
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*/
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void csp_kiss_rx(csp_iface_t * interface, uint8_t *buf, int len, void *pxTaskWoken);
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/**
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* The putc function is used by the kiss interface to send
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* a string of data to the serial port. This function must
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* be implemented by the user, and passed to the kiss
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* interface through the kiss_init function.
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* @param buf byte to push
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*/
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typedef void (*csp_kiss_putc_f)(char buf);
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/**
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* The characters not accepted by the kiss interface, are discarded
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* using this function, which must be implemented by the user
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* and passed through the kiss_init function.
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*
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* This reject function is typically used to display ASCII strings
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* sent over the serial port, which are not in KISS format. Such as
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* debugging information.
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*
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* @param c rejected character
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* @param pxTaskWoken NULL if task context, pointer to variable if ISR
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*/
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typedef void (*csp_kiss_discard_f)(char c, void *pxTaskWoken);
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typedef enum {
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KISS_MODE_NOT_STARTED,
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KISS_MODE_STARTED,
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KISS_MODE_ESCAPED,
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KISS_MODE_SKIP_FRAME,
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} kiss_mode_e;
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/**
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* This structure should be statically allocated by the user
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* and passed to the kiss interface during the init function
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* no member information should be changed
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*/
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typedef struct csp_kiss_handle_s {
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//! Put character on usart (tx).
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csp_kiss_putc_f kiss_putc;
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//! Discard - not KISS data (rx).
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csp_kiss_discard_f kiss_discard;
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//! Internal KISS state.
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unsigned int rx_length;
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//! Internal KISS state.
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kiss_mode_e rx_mode;
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//! Internal KISS state.
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unsigned int rx_first;
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//! Not used.
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volatile unsigned char *rx_cbuf;
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//! Internal KISS state.
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csp_packet_t * rx_packet;
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} csp_kiss_handle_t;
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void csp_kiss_init(csp_iface_t * csp_iface, csp_kiss_handle_t * csp_kiss_handle, csp_kiss_putc_f kiss_putc_f, csp_kiss_discard_f kiss_discard_f, const char * name);
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif /* _CSP_IF_KISS_H_ */
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