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/*
ping-apollo - exchange data with Apollo speech synthesizer
*/
#include <stdio.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <unistd.h>
#include <linux/serial.h>
#define DEFAULT_DEVICE "/dev/ttyS0"
#define MAXCHARS 128
static int readable (int fd, int usec);
/* write usage message and exit with status n. Write message to
stderr if n is nonzero, otherwise to stdout. */
void usage(int n)
{
fprintf(n?stderr:stdout,
"ping-apollo - exchange data with Apollo synthesizer\n"
"usage: ping-apollo data-to-write [device]\n"
"default device is /dev/ttyS0\n");
exit(n);
}
/* return nonzero if file descriptor fd could be read without
blocking. */
static int readable (int fd, int usec)
{
int retval;
fd_set rfds, wfds, efds;
struct timeval tv;
FD_ZERO(&rfds);
FD_SET(fd, &rfds);
FD_ZERO(&wfds);
FD_ZERO(&efds);
tv.tv_sec = usec/1000000; /* wait the specified time for the files to
become readable */
tv.tv_usec = usec%1000000;
retval = select(fd+1, &rfds, &wfds, &efds, &tv);
return retval;
}
int main(int argc, char **argv)
{
unsigned long status=0;
int fd;
int numchars=0;
char *devname=DEFAULT_DEVICE;
char buf[MAXCHARS+1];
if (argc < 2) usage(1);
if (argc > 2) devname=argv[2];
fd = open(devname,O_RDWR);
if (fd == -1)
{
fprintf(stderr, "cannot open %s\n", devname);
exit(1);
}
ioctl(fd, TIOCMGET, &status);
status |= TIOCM_RTS;
ioctl(fd, TIOCMSET, &status); /* assert RTS i.e. raise RTS line
(required before the Apollo will
read) */
usleep(10000); /* 100 usec is enough */
write(fd, argv[1], strlen(argv[1]));
{
unsigned lsr;
/* wait until UART transmit buffer is empty */
while(1)
{
ioctl(fd, TIOCSERGETLSR, &lsr); /* get line status register */
if (lsr) break;
usleep(10000);
}
}
usleep(10000); /* 100 usec is enough */
status &= ~TIOCM_RTS;
ioctl(fd, TIOCMSET, &status); /* un-assert RTS i.e. raise RTS line
(required before the Apollo will
write) */
/*
fprintf(stderr, "status=%lx RTS=%d DTR=%d DSR=%d\n",
status,
(status&TIOCM_RTS)!=0,
(status&TIOCM_DTR)!=0,
(status&TIOCM_DSR)!=0);
*/
/* 100000: stops after first punctuation
70000: stops after first punctuation
30000: stops after first punctuation
10000: stops after first punctuation
*/
while(readable(fd, 10000) && numchars < MAXCHARS)
{
if (read(fd, buf+numchars++, 1) < 0)
{
perror("read-apollo");
exit(1);
}
}
buf[numchars]=0;
printf("%s", buf);
return 0;
}
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