~/C/libserialport/listen.c

@@ -1,45 +1,36 @@
 #include <libserialport.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <stdbool.h>
+#include <string.h>
 
 /* Helper function for error handling. */
 int check(enum sp_return result);
 
 int main(int argc, char **argv) {
-  struct sp_port *serial_port;
-  char *port_name = "/dev/ttyACM0";
-
-  const int size = 256;
-  char *buffer = malloc(size + 1);
-
-  const unsigned int timeout = 1000;
   int result;
+  const int size = 30;
+  char *buffer = malloc(size + 1);
+  const char *port_name = "/dev/ttyACM0";
+  const unsigned int timeout = 1000;
+  struct sp_port *serial_port;
 
-  if (argc != 2) {
-    printf("Usage: %s <port>\n", argv[0]);
-    return -1;
-  } else {
-    port_name = argv[1];
-  }
-
-  printf("Connecting to '%s'...\n", port_name);
   check(sp_get_port_by_name(port_name, &serial_port));
+
+  printf("Opening port.\n");
   check(sp_open(serial_port, SP_MODE_READ_WRITE));
 
+  printf("Setting port to 9600 8N1, no flow control.\n");
   check(sp_set_baudrate(serial_port, 9600));
   check(sp_set_bits(serial_port, 8));
   check(sp_set_parity(serial_port, SP_PARITY_NONE));
   check(sp_set_stopbits(serial_port, 1));
   check(sp_set_flowcontrol(serial_port, SP_FLOWCONTROL_NONE));
-  puts("Connected.\n");
 
+  result =
+      check(sp_blocking_write(serial_port, "ping", strlen("ping"), timeout));
 
-  while (true) {
-    int pos = 0;
-
-    while (pos < size) {
-      result = check(sp_blocking_read(serial_port, buffer + pos, 1, timeout));
+  while (1) {
+    result = check(sp_blocking_read(serial_port, buffer, size, timeout));
 
     if (result == -1) {
       printf("Error reading from serial port\n");
@@ -48,20 +39,12 @@ int main(int argc, char **argv) {
       printf("No more data\n");
       break;
     } else {
-        if (buffer[pos] == '\n') {
-          buffer[pos] = '\0';
-          break;
-        } else
-          pos++;
-      }
-
-      puts(buffer);
+      buffer[result] = '\0';
+      printf("=====\n%s\n", buffer);
     }
   }
 
   free(buffer);
-
-  return 0;
 }
 
 /* Helper function for error handling. */