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upload-reset.c
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/* 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");
}
}