FreeCalypso > hg > freecalypso-sw
view rvinterf/lowlevel/openport.c @ 973:285505f98013
doc/RVTMUX: major updates triggered by new understanding of TM/ETM relationship
author | Mychaela Falconia <falcon@ivan.Harhan.ORG> |
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date | Sun, 15 Nov 2015 01:42:50 +0000 |
parents | f42854da4563 |
children |
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/* * This module takes care of opening the serial port and setting the * proper "raw" termios modes, including the baud rate. */ #include <sys/types.h> #include <sys/file.h> #include <sys/ioctl.h> #include <termios.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <strings.h> #include <unistd.h> int target_fd; char *baudrate_name = "115200"; static struct baudrate { char *name; speed_t termios_code; } baud_rate_table[] = { {"19200", B19200}, {"38400", B38400}, {"57600", B57600}, {"115200", B115200}, /* non-standard high baud rates "remapped" by CP2102 usb2serial IC */ {"203125", B230400}, {"406250", B460800}, {"812500", B921600}, /* table search terminator */ {NULL, B0} }; static speed_t get_baud_rate() { struct baudrate *br; for (br = baud_rate_table; br->name; br++) if (!strcmp(br->name, baudrate_name)) break; if (!br->name) { fprintf(stderr, "baud rate \"%s\" unknown/unsupported\n", baudrate_name); exit(1); } return br->termios_code; } open_target_serial(ttydev) char *ttydev; { struct termios target_termios; speed_t br_code; br_code = get_baud_rate(); target_fd = open(ttydev, O_RDWR|O_NONBLOCK); if (target_fd < 0) { perror(ttydev); exit(1); } target_termios.c_iflag = IGNBRK; target_termios.c_oflag = 0; target_termios.c_cflag = CLOCAL|HUPCL|CREAD|CS8; target_termios.c_lflag = 0; target_termios.c_cc[VMIN] = 1; target_termios.c_cc[VTIME] = 0; cfsetispeed(&target_termios, br_code); cfsetospeed(&target_termios, br_code); if (tcsetattr(target_fd, TCSAFLUSH, &target_termios) < 0) { perror("initial tcsetattr on target"); exit(1); } return 0; } set_serial_nonblock(state) int state; { ioctl(target_fd, FIONBIO, &state); }