init

src/main.c

@@ -0,0 +1,58 @@
+#include <fcntl.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <termios.h>
+
+int main() {
+        int fd = open("/dev/ttyACM0", O_RDWR | O_NOCTTY | O_NONBLOCK);
+        if (fd < 0) {
+                perror("open error");
+                return 1;
+        }
+
+        struct termios tty;
+        tcgetattr(fd, &tty);
+
+        tty.c_cflag &= ~CSIZE; // clear bit size
+        tty.c_cflag |= (CLOCAL | CREAD | CS8 | B115200);
+
+        tty.c_lflag = 0;  // raw mode
+        tty.c_iflag = 0;
+        tty.c_oflag = 0;
+
+        tcsetattr(fd, TCSAFLUSH, &tty); // aplly settings
+
+        char linebuf[512];
+        int linepos = 0;
+        char buf[128];
+        float v = 0.0f, a = 0.0f;
+        while (1) {
+                int n = read(fd, buf, sizeof(buf));
+                if (n > 0) {
+                        for (int i = 0; i < n; i++) {
+                                char c = buf[i];
+
+                                if (linepos < (int)sizeof(linebuf) - 1) {
+                                        linebuf[linepos++] = c;
+                                }
+
+                                if (c == '\n') {
+                                        linebuf[linepos] = '\0';
+
+                                        float tmp_v, tmp_a;
+
+                                        // expected format: "12.34,56.78\n"
+                                        if (sscanf(linebuf, "%f,%f", &tmp_v, &tmp_a) == 2) {
+                                                v = tmp_v;
+                                                a = tmp_a;
+                                                printf("latest: %f %f\n", v, a);
+                                        }
+                                        linepos = 0; // clear buffer
+                                }
+                        }
+                }
+
+                usleep(1000);
+        }
+        close(fd);
+}