Public bytenuts repository creation

src/serial.c

@@ -0,0 +1,59 @@
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <termios.h>
+#include <unistd.h>
+
+#include "serial.h"
+
+int
+serial_open(const char *path, speed_t bps)
+{
+    int fd;
+    struct termios otio;
+    struct termios ntio;
+
+    fd = open(path, O_RDWR | O_NOCTTY | O_NDELAY);
+    if (fd == -1) {
+        return -1;
+    }
+
+    tcgetattr(fd, &otio);
+    tcgetattr(fd, &ntio);
+
+    cfsetispeed(&ntio, bps);
+    cfsetospeed(&ntio, bps);
+
+    /* https://www.cmrr.umn.edu/~strupp/serial.html */
+    /* 8N1 */
+    ntio.c_cflag |= (CLOCAL | CREAD);
+    ntio.c_cflag &= ~(CSIZE|PARENB|CSTOPB);
+    ntio.c_cflag |=  (CS8); /* Set size after setting CSIZE mask */
+    ntio.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON|IXOFF|IXANY);
+    ntio.c_oflag &= ~(OPOST);
+    ntio.c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
+
+    ntio.c_cc[VINTR]    = 0;     /* Ctrl-c */
+    ntio.c_cc[VQUIT]    = 0;     /* Ctrl-\ */
+    ntio.c_cc[VERASE]   = 0;     /* del */
+    ntio.c_cc[VKILL]    = 0;     /* @ */
+    ntio.c_cc[VEOF]     = 4;     /* Ctrl-d */
+    ntio.c_cc[VTIME]    = 0;     /* inter-character timer unused */
+    ntio.c_cc[VMIN]     = 0;     /* non-blocking */
+    ntio.c_cc[VSWTC]    = 0;     /* '\0' */
+    ntio.c_cc[VSTART]   = 0;     /* Ctrl-q */
+    ntio.c_cc[VSTOP]    = 0;     /* Ctrl-s */
+    ntio.c_cc[VSUSP]    = 0;     /* Ctrl-z */
+    ntio.c_cc[VEOL]     = 0;     /* '\0' */
+    ntio.c_cc[VREPRINT] = 0;     /* Ctrl-r */
+    ntio.c_cc[VDISCARD] = 0;     /* Ctrl-u */
+    ntio.c_cc[VWERASE]  = 0;     /* Ctrl-w */
+    ntio.c_cc[VLNEXT]   = 0;     /* Ctrl-v */
+    ntio.c_cc[VEOL2]    = 0;     /* '\0' */
+
+    tcflush(fd, TCIFLUSH);
+    tcsetattr(fd, TCSANOW, &ntio);
+
+    return fd;
+}