kopia lustrzana https://github.com/OpenRTX/OpenRTX
132 wiersze
4.0 KiB
C
132 wiersze
4.0 KiB
C
/***************************************************************************
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* Copyright (C) 2025 by Federico Amedeo Izzo IU2NUO, *
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* Niccolò Izzo IU2KIN *
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* Frederik Saraci IU2NRO *
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* Silvano Seva IU2KWO *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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* This program 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 *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, see <http://www.gnu.org/licenses/> *
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***************************************************************************/
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#include <hwconfig.h>
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#include <stdint.h>
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#include <stddef.h>
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#include <string.h>
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#include <errno.h>
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#include <stdio.h>
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#include "nmea_rbuf.h"
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static inline size_t nmeaRbuf_size(struct nmeaRbuf *rbuf)
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{
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if(rbuf->wrPos >= rbuf->rdPos)
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return rbuf->wrPos - rbuf->rdPos;
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else
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return CONFIG_NMEA_RBUF_SIZE + rbuf->wrPos - rbuf->rdPos;
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}
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void nmeaRbuf_reset(struct nmeaRbuf *rbuf)
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{
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rbuf->wrPos = 0;
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rbuf->rdPos = 0;
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rbuf->rdLimit = 0;
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rbuf->filling = false;
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}
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int nmeaRbuf_putChar(struct nmeaRbuf *rbuf, const char c)
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{
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if((rbuf->filling == false) && (c == '$'))
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rbuf->filling = true;
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if(rbuf->filling) {
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size_t next = (rbuf->wrPos + 1) % CONFIG_NMEA_RBUF_SIZE;
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// No more space, drop current sentence and restart
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if(next == rbuf->rdPos) {
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rbuf->filling = false;
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rbuf->wrPos = rbuf->rdLimit;
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return -1;
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}
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// Append the new character
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rbuf->data[rbuf->wrPos] = c;
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rbuf->wrPos = next;
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// Check if a full sentence is present
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if(c == '\n') {
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rbuf->filling = false;
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rbuf->rdLimit = rbuf->wrPos;
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}
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}
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return 0;
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}
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int nmeaRbuf_putSentence(struct nmeaRbuf *rbuf, const char *sentence)
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{
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size_t len = strlen(sentence);
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size_t next = (rbuf->wrPos + len) % CONFIG_NMEA_RBUF_SIZE;
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size_t free = CONFIG_NMEA_RBUF_SIZE - nmeaRbuf_size(rbuf);
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// Bad-formatted string
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if((sentence[0] != '$') || (sentence[len - 1] != '\n'))
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return -1;
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// Not enough space
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if(len >= free)
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return -2;
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// Handle write pointer wrap-around
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if((rbuf->wrPos + len) >= CONFIG_NMEA_RBUF_SIZE) {
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size_t chunkSize = CONFIG_NMEA_RBUF_SIZE - rbuf->wrPos;
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memcpy(&rbuf->data[rbuf->wrPos], sentence, chunkSize);
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sentence += chunkSize;
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len -= chunkSize;
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rbuf->wrPos = 0;
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}
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memcpy(&rbuf->data[rbuf->wrPos], sentence, len);
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rbuf->wrPos = next;
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rbuf->rdLimit = next;
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return 0;
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}
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int nmeaRbuf_getSentence(struct nmeaRbuf *rbuf, char *buf, const size_t maxLen)
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{
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size_t bufPos = 0;
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char c;
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if(rbuf->rdPos == rbuf->rdLimit)
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return 0;
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do {
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// Pop one character from the buffer
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c = rbuf->data[rbuf->rdPos];
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rbuf->rdPos += 1;
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rbuf->rdPos %= CONFIG_NMEA_RBUF_SIZE;
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// Store it
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buf[bufPos] = c;
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if(bufPos < maxLen)
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bufPos += 1;
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} while(c != '\n');
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if(bufPos == maxLen)
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return -1;
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return (int) bufPos;
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}
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