FreeCalypso > hg > freecalypso-tools
view miscutil/fc-pulse-dtr.c @ 924:d452188587b4
rvinterf: begin change to backslash escape output format
Right now throughout the rvinterf suite, any time we emit output that
is expected to be ASCII, but may contain non-printable garbage, we use
'cat -v' form of garbage character representation. Unfortunately, this
transformation is lossy (can't be reversed 100% reliably in the user's
wetware), hence we would like to migrate to C-style backslash escapes,
including doubling of any already-present backslashes - this escape
mechanism is lossless. Begin this change by converting the output
of RV and L1 traces in rvinterf and rvtdump.
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Tue, 23 May 2023 03:10:50 +0000 |
parents | 5b8287c655cf |
children |
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/* * This utility opens a serial port, asserts DTR for 50 ms, then negates it * and exits. It is intended for use with FreeCalypso DUART28C adapters. */ #include <sys/types.h> #include <sys/file.h> #include <sys/ioctl.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> main(argc, argv) char **argv; { int target_fd; int mctl_arg = TIOCM_DTR; if (argc != 2) { fprintf(stderr, "usage: %s ttyname\n", argv[0]); exit(1); } target_fd = open(argv[1], O_RDWR|O_NONBLOCK); if (target_fd < 0) { perror(argv[1]); exit(1); } ioctl(target_fd, TIOCMBIS, &mctl_arg); usleep(50000); ioctl(target_fd, TIOCMBIC, &mctl_arg); exit(0); }