[net][at] Add AT commands component

components/net/at/src/at_utils.c

@@ -0,0 +1,102 @@
+/*
+ * File      : at_utils.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2018-04-14     chenyong     first version
+ */
+
+#include <at.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+static char send_buf[AT_CMD_MAX_LEN];
+static rt_size_t last_cmd_len = 0;
+
+/**
+ * dump hex format data to console device
+ *
+ * @param name name for hex object, it will show on log header
+ * @param buf hex buffer
+ * @param size buffer size
+ */
+void at_print_raw_cmd(const char *name, const char *buf, rt_size_t size)
+{
+#define __is_print(ch)       ((unsigned int)((ch) - ' ') < 127u - ' ')
+#define WIDTH_SIZE           32
+
+    rt_size_t i, j;
+
+    for (i = 0; i < size; i += WIDTH_SIZE)
+    {
+        rt_kprintf("[D/AT] %s: %04X-%04X: ", name, i, i + WIDTH_SIZE);
+        for (j = 0; j < WIDTH_SIZE; j++)
+        {
+            if (i + j < size)
+            {
+                rt_kprintf("%02X ", buf[i + j]);
+            }
+            else
+            {
+                rt_kprintf("   ");
+            }
+            if ((j + 1) % 8 == 0)
+            {
+                rt_kprintf(" ");
+            }
+        }
+        rt_kprintf("  ");
+        for (j = 0; j < WIDTH_SIZE; j++)
+        {
+            if (i + j < size)
+            {
+                rt_kprintf("%c", __is_print(buf[i + j]) ? buf[i + j] : '.');
+            }
+        }
+        rt_kprintf("\n");
+    }
+}
+
+const char *at_get_last_cmd(rt_size_t *cmd_size)
+{
+    *cmd_size = last_cmd_len;
+    return send_buf;
+}
+
+rt_size_t at_vprintf(rt_device_t device, const char *format, va_list args)
+{
+    last_cmd_len = vsnprintf(send_buf, sizeof(send_buf), format, args);
+
+#ifdef AT_PRINT_RAW_CMD
+    at_print_raw_cmd("send", send_buf, last_cmd_len);
+#endif
+
+    return rt_device_write(device, 0, send_buf, last_cmd_len);
+}
+
+rt_size_t at_vprintfln(rt_device_t device, const char *format, va_list args)
+{
+    rt_size_t len;
+
+    len = at_vprintf(device, format, args);
+
+    rt_device_write(device, 0, "\r\n", 2);
+
+    return len + 2;
+}