annotate serial/xmit.c @ 81:8c23d2a9c013

doc/GrcardSIM2-programming: update for fcsim1-program
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 09 Apr 2021 08:35:54 +0000
parents 5ee00413b8af
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
41
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
1 /*
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
2 * This module implements the function for sending byte strings
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
3 * to the SIM and collecting the UART echo.
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
4 */
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
5
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
6 #include <sys/types.h>
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
7 #include <sys/time.h>
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
8 #include <sys/errno.h>
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
9 #include <stdio.h>
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
10 #include <stdlib.h>
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
11 #include <string.h>
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
12 #include <strings.h>
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
13 #include <unistd.h>
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
14
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
15 extern int target_fd;
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
16 extern int inverse_coding;
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
17
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
18 send_bytes_to_sim(data, nbytes)
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
19 u_char *data;
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
20 unsigned nbytes;
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
21 {
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
22 u_char buf1[255], buf2[255];
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
23 fd_set fds;
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
24 struct timeval tv;
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
25 unsigned rcvd;
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
26 int cc;
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
27
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
28 bcopy(data, buf1, nbytes);
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
29 if (inverse_coding)
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
30 invert_bytes(buf1, nbytes);
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
31 write(target_fd, buf1, nbytes);
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
32 for (rcvd = 0; rcvd < nbytes; ) {
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
33 FD_ZERO(&fds);
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
34 FD_SET(target_fd, &fds);
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
35 tv.tv_sec = 1;
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
36 tv.tv_usec = 0;
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
37 cc = select(target_fd+1, &fds, NULL, NULL, &tv);
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
38 if (cc < 0) {
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
39 if (errno == EINTR)
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
40 continue;
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
41 perror("select");
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
42 return(-1);
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
43 }
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
44 if (cc < 1) {
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
45 fprintf(stderr,
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
46 "error: timeout waiting for echo of Tx bytes\n");
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
47 return(-1);
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
48 }
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
49 cc = read(target_fd, buf2 + rcvd, nbytes - rcvd);
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
50 if (cc <= 0) {
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
51 perror("read after successful select");
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
52 return(-1);
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
53 }
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
54 rcvd += cc;
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
55 }
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
56 if (bcmp(buf1, buf2, nbytes)) {
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
57 fprintf(stderr, "error: UART echo mismatch\n");
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
58 return(-1);
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
59 } else
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
60 return(0);
5ee00413b8af serial: beginning of fcsim-serial-be
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
61 }