sync: from 61124bba

1. driver:
  1). Fix hw_timer issue, #96;
  2). Fix SPI output data error;
  3). Fix SPI read data bug;
  4). Fix driver lib compile issue;
  5). Fix uart flow control issue;

2. lwip:
  1). Enable lwip ETHARP_TRUS_IP_MAC;
  2). Modify dhcp/dhcps timer from 60 seconds to 1 second;

3. WiFi:
  1). Support CSA;

driver_lib/make_lib.sh

@@ -1,11 +1,23 @@
-#!/bin/bash -x
+#!/bin/bash
+set -e
 
-echo "make_lib.sh version 20160307"
+export SDK_PATH=$(dirname $(pwd))
+
+echo "make_lib.sh version 20150924"
 echo ""
 
+if [ $SDK_PATH ]; then
+    echo "SDK_PATH:"
+    echo "$SDK_PATH"
+    echo ""
+else
+    echo "ERROR: Please export SDK_PATH in make_lib.sh firstly, exit!!!"
+    exit
+fi
+
 cd $1
 make clean
-make COMPILE=gcc
-cp .output/eagle/debug/lib/lib$1.a ../../lib/lib$1.a
-xtensa-lx106-elf-strip --strip-unneeded ../../lib/lib$1.a
+make
+cp .output/eagle/debug/lib/lib$1.a $SDK_PATH/lib/lib$1.a
+xtensa-lx106-elf-strip --strip-unneeded $SDK_PATH/lib/lib$1.a
 cd ..