listen from serial

~/C/libserialport/.editorconfig

@@ -0,0 +1,6 @@
+[{clear,build,format-code}]
+indent_style = space
+indent_size = 4
+
+[*.c]
+indent_size = 2

~/C/libserialport/.gitignore

@@ -1 +1,11 @@
+# libserialport examples
+port_info.c
+list_ports.c
+send_receive.c
+
+# binaries
 port_info
+list_ports
+send_receive
+
+listen

~/C/libserialport/build

@@ -8,7 +8,11 @@ export C_INCLUDE_PATH=$HOME/Git/libserialport
 export LIBRARY_PATH=$HOME/Git/libserialport/.libs
 
 for file in \
-    port_info.c
+    port_info.c \
+    list_ports.c \
+    send_receive.c \
+    listen.c \
+
 do
     gcc -static -Wall -O3 -o ${file%.*} $file -lserialport
 done

~/C/libserialport/clear

@@ -4,4 +4,14 @@
 #
 # Alexander Popov <iiiypuk@fastmail.fm>
 
-rm port_info
+files=(
+    "port_info"
+    "list_ports"
+    "send_receive"
+    "listen"
+)
+
+for file in ${files[@]}
+do
+    rm $file &> /dev/null
+done

~/C/libserialport/format-code

@@ -0,0 +1,14 @@
+#!/bin/sh
+#
+# formt-code - script for beautify code by clang-format.
+#
+# Alexander Popov <iiiypuk@fastmail.fm>
+
+files=(
+    "listen.c"
+)
+
+for file in "${files[@]}"
+do
+    clang-format -i --style=LLVM --sort-includes=false $file
+done

~/C/libserialport/listen.c

@@ -0,0 +1,74 @@
+#include <libserialport.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+/* Helper function for error handling. */
+int check(enum sp_return result);
+
+int main(int argc, char **argv) {
+  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;
+
+  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));
+
+  result =
+      check(sp_blocking_write(serial_port, "ping", strlen("ping"), timeout));
+
+  while (1) {
+    result = check(sp_blocking_read(serial_port, buffer, size, timeout));
+
+    if (result == -1) {
+      printf("Error reading from serial port\n");
+      break;
+    } else if (result == 0) {
+      printf("No more data\n");
+      break;
+    } else {
+      buffer[result] = '\0';
+      printf("=====\n%s\n", buffer);
+    }
+  }
+
+  free(buffer);
+}
+
+/* Helper function for error handling. */
+int check(enum sp_return result) {
+  /* For this example we'll just exit on any error by calling abort(). */
+  char *error_message;
+
+  switch (result) {
+  case SP_ERR_ARG:
+    printf("Error: Invalid argument.\n");
+    abort();
+  case SP_ERR_FAIL:
+    error_message = sp_last_error_message();
+    printf("Error: Failed: %s\n", error_message);
+    sp_free_error_message(error_message);
+    abort();
+  case SP_ERR_SUPP:
+    printf("Error: Not supported.\n");
+    abort();
+  case SP_ERR_MEM:
+    printf("Error: Couldn't allocate memory.\n");
+    abort();
+  case SP_OK:
+  default:
+    return result;
+  }
+}