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dv3000d.c
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dv3000d.c
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/*
* Copyright (C) 2014 by Jonathan Naylor G4KLX
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <ctype.h>
#include <errno.h>
#include <termios.h>
#include <string.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/select.h>
#include <sys/socket.h>
#include <netinet/in.h>
#if defined(RASPBERRY_PI)
#include <wiringPi.h>
#else
int wiringPiSetup();
void pinMode(int pin, int mode);
void digitalWrite(int pin, int value);
void delay(unsigned int delay);
#define OUTPUT 1
#define HIGH 1
#define LOW 0
#endif
#define DV3000_TTY "/dev/ttyAMA0"
#define DV3000_VERSION "2014-04-23"
#define AMBE3000_HEADER_LEN 4U
#define AMBE3000_START_BYTE 0x61U
#define DEFAULT_PORT 2460U
#define BUFFER_LENGTH 400U
struct sockaddr_in sa;
int serialFd;
int sockFd;
int debug = 0;
void dump(char *text, unsigned char *data, unsigned int length)
{
unsigned int offset = 0U;
unsigned int i;
fputs(text, stdout);
fputc('\n', stdout);
while (length > 0U) {
unsigned int bytes = (length > 16U) ? 16U : length;
fprintf(stdout, "%04X: ", offset);
for (i = 0U; i < bytes; i++)
fprintf(stdout, "%02X ", data[offset + i]);
for (i = bytes; i < 16U; i++)
fputs(" ", stdout);
fputs(" *", stdout);
for (i = 0U; i < bytes; i++) {
unsigned char c = data[offset + i];
if (isprint(c))
fputc(c, stdout);
else
fputc('.', stdout);
}
fputs("*\n", stdout);
offset += 16U;
if (length >= 16U)
length -= 16U;
else
length = 0U;
}
}
int openWiringPi(void)
{
int ret = wiringPiSetup();
if (ret == -1) {
fprintf(stderr, "dv3000d: error when initialising wiringPi\n");
return 0;
}
pinMode(7, OUTPUT); // Power
// Reset the hardware
digitalWrite(7, LOW);
delay(20UL);
digitalWrite(7, HIGH);
delay(750UL);
if (debug)
fprintf(stdout, "opened the Wiring Pi library\n");
return 1;
}
int openSerial()
{
struct termios tty;
int fd;
fd = open(DV3000_TTY, O_RDWR | O_NOCTTY | O_SYNC);
if (fd < 0) {
fprintf(stderr, "dv3000d: error when opening " DV3000_TTY ", errno=%d", errno);
return fd;
}
if (tcgetattr(fd, &tty) != 0) {
fprintf(stderr, "dv3000d: error %d from tcgetattr\n", errno);
return -1;
}
cfsetospeed(&tty, B230400);
cfsetispeed(&tty, B230400);
tty.c_cflag = (tty.c_cflag & ~CSIZE) | CS8;
tty.c_iflag &= ~IGNBRK;
tty.c_lflag = 0;
tty.c_oflag = 0;
tty.c_cc[VMIN] = 0;
tty.c_cc[VTIME] = 5;
tty.c_iflag &= ~(IXON | IXOFF | IXANY);
tty.c_cflag |= (CLOCAL | CREAD);
tty.c_cflag &= ~(PARENB | PARODD);
tty.c_cflag &= ~CSTOPB;
tty.c_cflag &= ~CRTSCTS;
if (tcsetattr(fd, TCSANOW, &tty) != 0) {
fprintf(stderr, "dv3000d: error %d from tcsetattr\n", errno);
return -1;
}
if (debug)
fprintf(stdout, "opened " DV3000_TTY "\n");
return fd;
}
int openSocket(uint16_t port)
{
struct sockaddr_in sa;
int ret;
int fd;
fd = socket(AF_INET, SOCK_DGRAM, 0);
if (fd < 0) {
fprintf(stderr, "dv3000d: error when creating the socket, errno=%d", errno);
return fd;
}
memset(&sa, 0x00, sizeof(struct sockaddr_in));
sa.sin_family = AF_INET;
sa.sin_port = htons(port);
sa.sin_addr.s_addr = htonl(INADDR_ANY);
ret = bind(fd, (struct sockaddr *)&sa, sizeof(struct sockaddr_in));
if (ret < 0) {
fprintf(stderr, "dv3000d: error when binding the socket to port %u, errno=%d", port, errno);
return fd;
}
if (debug)
fprintf(stdout, "opened the UDP socket on port %u\n", port);
return fd;
}
int processSerial(void)
{
unsigned char buffer[BUFFER_LENGTH];
unsigned int respLen;
unsigned int offset;
ssize_t len;
len = read(serialFd, buffer, 1);
if (len != 1) {
fprintf(stderr, "dv3000d: error when reading from the serial port, errno=%d", errno);
return 0;
}
if (buffer[0U] != AMBE3000_START_BYTE) {
fprintf(stderr, "dv3000d: unknown byte from the DV3000, 0x%02X", buffer[0U]);
return 1;
}
offset = 0U;
while (offset < (AMBE3000_HEADER_LEN - 1U)) {
len = read(serialFd, buffer + 1U + offset, AMBE3000_HEADER_LEN - 1 - offset);
if (len == 0)
delay(5UL);
offset += len;
}
respLen = buffer[1U] * 256U + buffer[2U];
offset = 0U;
while (offset < respLen) {
len = read(serialFd, buffer + AMBE3000_HEADER_LEN + offset, respLen - offset);
if (len == 0)
delay(5UL);
offset += len;
}
respLen += AMBE3000_HEADER_LEN;
if (debug)
dump("Serial data", buffer, respLen);
if (sa.sin_port != 0U) {
len = sendto(sockFd, buffer, respLen, 0, (struct sockaddr *)&sa, sizeof(struct sockaddr_in));
if (respLen != len) {
fprintf(stderr, "dv3000d: error when writing to the socket, len=%d, errno=%d", len, errno);
return 0;
}
}
return 1;
}
int processSocket(void)
{
unsigned char buffer[BUFFER_LENGTH];
socklen_t sl = sizeof(struct sockaddr_in);
unsigned int len;
ssize_t n;
n = recvfrom(sockFd, buffer, BUFFER_LENGTH, 0, (struct sockaddr *)&sa, &sl);
if (n < 0) {
fprintf(stderr, "dv3000d: error when reading from the socket, errno=%d", errno);
return 0;
}
if (debug)
dump("Socket data", buffer, n);
if (buffer[0U] != AMBE3000_START_BYTE) {
fprintf(stderr, "dv3000d: invalid start byte when reading from the socket, 0x%02X", buffer[0U]);
return 1;
}
len = buffer[1U] * 256U + buffer[2U] + AMBE3000_HEADER_LEN;
if (n != len) {
fprintf(stderr, "dv3000d: invalid length when reading from the socket, %u=%d", len, n);
return 1;
}
n = write(serialFd, buffer, len);
if (n != len) {
fprintf(stderr, "dv3000d: error when writing to the serial port, errno=%d", errno);
return 0;
}
return 1;
}
int main(int argc, char **argv)
{
uint16_t port = DEFAULT_PORT;
int daemon = 0;
int topFd;
fd_set fds;
int ret;
int c;
while ((c = getopt(argc, argv, "dp:vx")) != -1) {
switch (c) {
case 'd':
daemon = 1;
break;
case 'p':
port = (uint16_t)atoi(optarg);
break;
case 'v':
fprintf(stdout, "dv3000d: version " DV3000_VERSION "\n");
return 0;
case 'x':
debug = 1;
break;
default:
fprintf(stderr, "Usage: dv3000d [-d] [-p port] [-v] [-x]\n");
return 1;
}
}
fprintf(stderr, "dv3000d has been deprecated, please use AMBEserverGPIO for DV3000 or AMBEserver for DV3000U\n");
if (daemon) {
pid_t pid = fork();
if (pid < 0) {
fprintf(stderr, "dv3000d: error in fork(), exiting\n");
return 1;
}
// If this is the parent, exit
if (pid > 0)
return 0;
// We are the child from here onwards
setsid();
chdir("/");
umask(0);
}
ret = openWiringPi();
if (!ret)
return 1;
sockFd = openSocket(port);
if (sockFd < 0)
return 1;
serialFd = openSerial();
if (serialFd < 0)
return 1;
memset(&sa, 0x00, sizeof(struct sockaddr_in));
topFd = sockFd;
if (serialFd > topFd)
topFd = serialFd;
topFd++;
for (;;) {
FD_ZERO(&fds);
FD_SET(sockFd, &fds);
FD_SET(serialFd, &fds);
ret = select(topFd, &fds, NULL, NULL, NULL);
if (ret < 0) {
fprintf(stderr, "dv3000d: error from select, errno=%d\n", errno);
return 1;
}
if (FD_ISSET(sockFd, &fds)) {
ret = processSocket();
if (!ret)
return 1;
}
if (FD_ISSET(serialFd, &fds)) {
ret = processSerial();
if (!ret)
return 1;
}
}
return 0;
}