123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166 |
- /* Copyright (C) 2015 Roger Clark <www.rogerclark.net>
- *
- * 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.
- *
- *
- * Utility to send the reset sequence on RTS and DTR and chars
- * which resets the libmaple and causes the bootloader to be run
- *
- *
- *
- * Terminal control code by Heiko Noordhof (see copyright below)
- */
- /* Copyright (C) 2003 Heiko Noordhof <heikyAusers.sf.net>
- *
- * 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.
- */
- #include <stdio.h>
- #include <stdlib.h>
- #include <termios.h>
- #include <unistd.h>
- #include <sys/types.h>
- #include <sys/stat.h>
- #include <fcntl.h>
- #include <sys/ioctl.h>
- #include <stdbool.h>
- /* Function prototypes (belong in a seperate header file) */
- int openserial(char *devicename);
- void closeserial(void);
- int setDTR(unsigned short level);
- int setRTS(unsigned short level);
- /* Two globals for use by this module only */
- static int fd;
- static struct termios oldterminfo;
- void closeserial(void)
- {
- tcsetattr(fd, TCSANOW, &oldterminfo);
- close(fd);
- }
- int openserial(char *devicename)
- {
- struct termios attr;
- if ((fd = open(devicename, O_RDWR)) == -1)
- return 0; /* Error */
- atexit(closeserial);
- if (tcgetattr(fd, &oldterminfo) == -1)
- return 0; /* Error */
- attr = oldterminfo;
- attr.c_cflag |= CRTSCTS | CLOCAL;
- attr.c_oflag = 0;
- if (tcflush(fd, TCIOFLUSH) == -1)
- return 0; /* Error */
- if (tcsetattr(fd, TCSANOW, &attr) == -1)
- return 0; /* Error */
- /* Set the lines to a known state, and */
- /* finally return non-zero is successful. */
- return setRTS(0) && setDTR(0);
- }
- /* For the two functions below:
- * level=0 to set line to LOW
- * level=1 to set line to HIGH
- */
- int setRTS(unsigned short level)
- {
- int status;
- if (ioctl(fd, TIOCMGET, &status) == -1)
- {
- perror("setRTS(): TIOCMGET");
- return 0;
- }
- if (level)
- status |= TIOCM_RTS;
- else
- status &= ~TIOCM_RTS;
- if (ioctl(fd, TIOCMSET, &status) == -1)
- {
- perror("setRTS(): TIOCMSET");
- return 0;
- }
- return 1;
- }
- int setDTR(unsigned short level)
- {
- int status;
- if (ioctl(fd, TIOCMGET, &status) == -1)
- {
- perror("setDTR(): TIOCMGET");
- return 0;
- }
- if (level)
- status |= TIOCM_DTR;
- else
- status &= ~TIOCM_DTR;
- if (ioctl(fd, TIOCMSET, &status) == -1)
- {
- perror("setDTR: TIOCMSET");
- return 0;
- }
- return 1;
- }
- /* This portion of code was written by Roger Clark
- * It was informed by various other pieces of code written by Leaflabs to reset their
- * Maple and Maple mini boards
- */
- main(int argc, char *argv[])
- {
- if (argc < 2 || argc > 3)
- {
- printf("Usage upload-reset <serial_device> <Optional_delay_in_milliseconds>\n\r");
- return;
- }
- if (openserial(argv[1]))
- {
- // Send magic sequence of DTR and RTS followed by the magic word "1EAF"
- setRTS(false);
- setDTR(false);
- setDTR(true);
- usleep(50000L);
- setDTR(false);
- setRTS(true);
- setDTR(true);
- usleep(50000L);
- setDTR(false);
- usleep(50000L);
- write(fd, "1EAF", 4);
- closeserial();
- if (argc == 3)
- {
- usleep(atol(argv[2]) * 1000L);
- }
- }
- else
- {
- printf("Failed to open serial device.\n\r");
- }
- }
|