tncattach/Serial.c

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4.3 KiB
C
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#include "Serial.h"
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extern void cleanup();
int open_port(char* port) {
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int fd;
fd = open(port, O_RDWR | O_NOCTTY | O_SYNC | O_NDELAY);
if (fd == -1) {
perror("The serial port could not be opened");
cleanup();
exit(1);
} else {
fcntl(fd, F_SETFL, 0);
}
return fd;
}
int close_port(int fd) {
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return close(fd);
}
void set_speed(void *tty_s, int speed) {
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cfsetospeed(tty_s, speed);
cfsetispeed(tty_s, speed);
}
bool setup_port(int fd, int speed) {
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struct termios tty;
if (tcgetattr(fd, &tty) != 0) {
perror("Error setting port speed, could not read port parameters");
return false;
}
switch (speed) {
case 0:
set_speed(&tty, B0);
break;
case 50:
set_speed(&tty, B50);
break;
case 75:
set_speed(&tty, B75);
break;
case 110:
set_speed(&tty, B110);
break;
case 134:
set_speed(&tty, B134);
break;
case 150:
set_speed(&tty, B150);
break;
case 200:
set_speed(&tty, B200);
break;
case 300:
set_speed(&tty, B300);
break;
case 600:
set_speed(&tty, B600);
break;
case 1200:
set_speed(&tty, B1200);
break;
case 2400:
set_speed(&tty, B2400);
break;
case 4800:
set_speed(&tty, B4800);
break;
case 9600:
set_speed(&tty, B9600);
break;
case 19200:
set_speed(&tty, B19200);
break;
case 38400:
set_speed(&tty, B38400);
break;
case 57600:
set_speed(&tty, B57600);
break;
case 115200:
set_speed(&tty, B115200);
break;
case 230400:
set_speed(&tty, B230400);
break;
default:
printf("Error: Invalid port speed %d specified\r\n", speed);
cleanup();
exit(1);
return false;
}
// Set 8-bit characters, no parity, one stop bit
tty.c_cflag |= CS8;
tty.c_cflag &= ~PARENB;
tty.c_cflag &= ~CSTOPB;
// Disable hardware flow control
tty.c_cflag &= ~CRTSCTS;
// Enable reading and ignore modem
// control lines
tty.c_cflag |= CREAD | CLOCAL;
// Disable canonical mode, echo
// and signal characters.
tty.c_lflag &= ~ICANON;
tty.c_lflag &= ~ECHO;
tty.c_lflag &= ~ECHOE;
tty.c_lflag &= ~ECHONL;
tty.c_lflag &= ~ISIG;
// Disable processing of input,
// just pass the raw data.
tty.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL);
// Disable XON/XOFF software flow control.
tty.c_iflag &= ~(IXON | IXOFF | IXANY);
// Disable processing output bytes
// and new line conversions
tty.c_oflag &= ~OPOST;
tty.c_oflag &= ~ONLCR;
// Block forever until at least one byte is read.
tty.c_cc[VMIN] = 1;
tty.c_cc[VTIME] = 0;
// TODO: Check these
// Prevent conversion of tabs to spaces (NOT PRESENT IN LINUX)
// tty.c_oflag &= ~OXTABS;
// Prevent removal of C-d chars (0x004) in output (NOT PRESENT IN LINUX)
// tty.c_oflag &= ~ONOEOT;
if (tcsetattr(fd, TCSANOW, &tty) != 0) {
perror("Could not configure serial port parameters");
return false;
} else {
return true;
}
}
bool set_port_blocking(int fd, bool should_block) {
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struct termios tty;
memset(&tty, 0, sizeof tty);
if (tcgetattr(fd, &tty) != 0) {
perror("Error configuring port blocking behaviour, could not read port parameters");
return false;
} else {
// TODO: Implement this correctly
if (should_block) {
// Block forever until at least one byte is read.
tty.c_cc[VMIN] = 1;
tty.c_cc[VTIME] = 0;
} else {
// Never block, always return immediately with
// whatever is available.
tty.c_cc[VMIN] = 0;
tty.c_cc[VTIME] = 0;
}
if (tcsetattr(fd, TCSANOW, &tty) != 0) {
perror("Could not set port parameters while configuring blocking behaviour");
return false;
} else {
return true;
}
}
}