updated picoTCP to 1.4.0, lowered build optimization levels to -O2, improved selftest

ext/picotcp/include/arch/pico_atsamd21j18.h

@@ -0,0 +1,61 @@
+/*********************************************************************
+   PicoTCP. Copyright (c) 2012-2017 Altran Intelligent Systems. Some rights reserved.
+   See COPYING, LICENSE.GPLv2 and LICENSE.GPLv3 for usage.
+ *********************************************************************/
+
+/*** MACHINE CONFIGURATION ***/
+/* Temporary (POSIX) stuff. */
+#include <string.h>
+#include <unistd.h>
+
+/* Temporary debugging stuff. */
+#include <stdarg.h>
+#include "halUart.h"
+#include <stdio.h>
+
+static void print_uart(char *str)
+{
+    int i, len;
+    len = (int)strlen(str);
+    for (i = 0; i < len; i++) {
+        HAL_UartWriteByte(str[i]);
+        if (HAL_UartTxFull())
+            HAL_UartFlush();
+    }
+}
+
+static inline void sam_dbg(const char *format, ...)
+{
+    char msg[128] = { 0 };
+    va_list args;
+    va_start(args, format);
+    vsnprintf(msg, 256, format, args);
+    va_end(args);
+    print_uart(msg);
+}
+
+//#define dbg sam_dbg
+#define dbg(...) do { } while(0)
+
+extern volatile uint32_t sam_tick;
+
+#define pico_zalloc(x) calloc(x, 1)
+#define pico_free(x) free(x)
+
+static inline unsigned long PICO_TIME(void)
+{
+    register uint32_t tick = sam_tick;
+    return tick / 1000;
+}
+
+static inline unsigned long PICO_TIME_MS(void)
+{
+    return sam_tick;
+}
+
+static inline void PICO_IDLE(void)
+{
+    unsigned long tick_now = sam_tick;
+    while(tick_now == sam_tick) ;
+}
+