mirror of
https://github.com/dj0abr/SSB_HighSpeed_Modem.git
synced 2024-11-22 12:19:49 -05:00
130 lines
3.6 KiB
C
130 lines
3.6 KiB
C
/*
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* High Speed modem to transfer data in a 2,7kHz SSB channel
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* =========================================================
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* Author: DJ0ABR
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*
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* (c) DJ0ABR
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* www.dj0abr.de
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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 2 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, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include "qo100modem.h"
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void *threadfunction(void *dummy);
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#define MAXUDPTHREADS 20
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RXCFG rxcfg[MAXUDPTHREADS];
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int rxcfg_idx = 0;
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// start UDP reception
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// sock ... pointer to a socket (just a pointer to an int)
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// port ... own port, messages only to this port are received
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// rxfunc ... pointer to a callback function, will be called for received data
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// keeprunning ... pointer to an int. If it is set to 0, the function exits
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void UdpRxInit(int *sock, int port, void (*rxfunc)(uint8_t *, int, struct sockaddr_in*), int *keeprunning)
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{
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if(rxcfg_idx >= MAXUDPTHREADS)
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{
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printf("max number of UDP threads\n");
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exit(0);
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}
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rxcfg[rxcfg_idx].sock = sock;
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rxcfg[rxcfg_idx].port = port;
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rxcfg[rxcfg_idx].rxfunc = rxfunc;
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rxcfg[rxcfg_idx].keeprunning = keeprunning;
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// bind port
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struct sockaddr_in sin;
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*sock = socket(PF_INET, SOCK_DGRAM, 0);
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if (*sock == -1){
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printf("Failed to create Socket\n");
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exit(0);
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}
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int enable = 1;
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setsockopt(*sock, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(int));
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memset(&sin, 0, sizeof(struct sockaddr_in));
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sin.sin_family = AF_INET;
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sin.sin_port = htons(port);
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sin.sin_addr.s_addr = INADDR_ANY;
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if (bind(*sock, (struct sockaddr *)&sin, sizeof(struct sockaddr_in)) != 0)
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{
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printf("Failed to bind socket, port:%d\n",port);
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close(*sock);
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exit(0);
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}
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// port sucessfully bound
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// create the receive thread
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pthread_t rxthread;
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pthread_create(&rxthread, NULL, threadfunction, &(rxcfg[rxcfg_idx]));
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rxcfg_idx++;
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}
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void *threadfunction(void *param)
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{
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RXCFG rxcfg;
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memcpy((uint8_t *)(&rxcfg), (uint8_t *)param, sizeof(RXCFG));
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socklen_t fromlen;
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int recvlen;
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char rxbuf[256];
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struct sockaddr_in fromSock;
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fromlen = sizeof(struct sockaddr_in);
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while(*rxcfg.keeprunning)
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{
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recvlen = recvfrom(*rxcfg.sock, rxbuf, 256, 0, (struct sockaddr *)&fromSock, &fromlen);
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if (recvlen > 0)
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{
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// data received, send it to callback function
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(*rxcfg.rxfunc)((uint8_t *)rxbuf,recvlen, &fromSock);
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}
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}
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return NULL;
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}
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// send UDP message
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void sendUDP(char *destIP, int destPort, uint8_t *pdata, int len)
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{
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int sockfd;
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struct sockaddr_in servaddr;
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// Creating socket file descriptor
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if ( (sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0 ) {
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printf("sendUDP: socket creation failed\n");
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exit(0);
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}
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memset(&servaddr, 0, sizeof(servaddr));
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// Filling server information
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servaddr.sin_family = AF_INET;
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servaddr.sin_port = htons(destPort);
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//printf("Send to <%s><%d> Len:%d\n",destIP,destPort,len);
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servaddr.sin_addr.s_addr=inet_addr(destIP);
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sendto(sockfd, (char *)pdata, len, 0, (const struct sockaddr *) &servaddr, sizeof(servaddr));
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close(sockfd);
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}
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