Squashed commit of the following:

commit 8215a8352305704afaf54b389343e9f41365b40e
Merge: fe7734162 18510fa80
Author: Bernard Xiong <bernard.xiong@gmail.com>
Date:   Wed Aug 15 08:47:26 2018 +0800

    Merge pull request #1715 from heyuanjie87/syscall

    Syscall

commit 18510fa80fef9751228935ef31e0b9fab9e3cdcc
Author: heyuanjie87 <sc943313837@gmail.com>
Date:   Tue Aug 14 09:33:22 2018 +0800

    Update select.c

commit c90b449dac29e3e5a46a20988b043d283d3405d6
Author: heyuanjie87 <sc943313837@gmail.com>
Date:   Mon Aug 13 22:42:09 2018 +0800

    Update select.c

commit fe773416217b04d5873b9b6f4857b54e80b3d5e9
Merge: b571cd889 495927696
Author: Bernard Xiong <bernard.xiong@gmail.com>
Date:   Mon Aug 13 19:02:34 2018 +0800

    Merge pull request #1717 from geniusgogo/fix_iar_project

    fixed IAR project add LIBS

commit 495927696e759c7ec531bee6d8f33d6f5dfea27b
Author: xieyangrun <xieyangrun@smartcomma.com>
Date:   Mon Aug 13 16:54:02 2018 +0800

    fixed IAR project add LIBS

commit b571cd8899ff37341f184dbded101d6ef434d8c1
Merge: 68edd04cb 250de62d5
Author: ZYH <lymz@foxmail.com>
Date:   Sun Aug 12 20:56:30 2018 +0800

    Merge pull request #1714 from xeonxu/fix_pwm

    [STM32 BSP]Fix PWM channel calculate argorithm.

commit d948dba42a7b2a219508ac28cf78e6e44f835dcf
Author: heyuanjie87 <sc943313837@gmail.com>
Date:   Sun Aug 12 20:41:56 2018 +0800

    update select.c

commit fd209cb880f6d2d39b6265c09727182b55446bdf
Author: heyuanjie <heyuanjie>
Date:   Sun Aug 12 20:26:16 2018 +0800

    [lwp]添加select系统调用

commit 250de62d5c5ababe7c3ae2a752b0f53734fab0ad
Author: Noe Xu <xeonxu@gmail.com>
Date:   Sun Aug 12 19:54:19 2018 +0800

    [STM32 BSP]Fix PWM channel calculate argorithm.

    Change-Id: Ie65437365784033dcee8d8e9f21dfc5727ba9d3c

bsp/stm32f4xx-HAL/drivers/drv_pwm.c

@@ -38,18 +38,21 @@ static struct rt_pwm_ops drv_ops =
 
 static rt_err_t drv_pwm_enable(TIM_HandleTypeDef * htim, struct rt_pwm_configuration *configuration, rt_bool_t enable)
 {
-    rt_uint32_t channel = 0x04 * configuration->channel;
+    rt_uint32_t channel = 0x04 * (configuration->channel - 1);
     if(!enable)
     {
         HAL_TIM_PWM_Stop(htim, channel);
     }
-    HAL_TIM_PWM_Start(htim, channel);
+    else
+    {
+        HAL_TIM_PWM_Start(htim, channel);
+    }
     return RT_EOK;
 }
 
 static rt_err_t drv_pwm_get(TIM_HandleTypeDef * htim, struct rt_pwm_configuration *configuration)
 {
-    rt_uint32_t channel = 0x04 * configuration->channel;
+    rt_uint32_t channel = 0x04 * (configuration->channel - 1);
     rt_uint32_t tim_clock;
 #if (RT_HSE_HCLK > 100000000UL)//100M
     if(htim->Instance == TIM1 && htim->Instance == TIM8)
@@ -81,7 +84,7 @@ static rt_err_t drv_pwm_set(TIM_HandleTypeDef * htim, struct rt_pwm_configuratio
 {
     rt_uint32_t period, pulse;
     rt_uint32_t tim_clock, psc;
-    rt_uint32_t channel = 0x04 * configuration->channel;
+    rt_uint32_t channel = 0x04 * (configuration->channel - 1);
 #if (RT_HSE_HCLK > 100000000UL)//100M
     if(htim->Instance == TIM1 && htim->Instance == TIM8)
     {

components/dfs/src/select.c

@@ -28,6 +28,23 @@
 #include <dfs_poll.h>
 #include <dfs_select.h>
 
+static void fdszero(fd_set *set, int nfds)
+{
+    fd_mask *m;
+    int n;
+    
+    /*
+      The 'sizeof(fd_set)' of the system space may differ from user space,
+      so the actual size of the 'fd_set' is determined here with the parameter 'nfds'
+    */
+    m = (fd_mask*)set;
+    for (n = 0; n < nfds; n += (sizeof(fd_mask) * 8))
+    {
+        rt_memset(m, 0, sizeof(fd_mask));
+        m ++;
+    }
+}
+
 int select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struct timeval *timeout)
 {
     int fd;
@@ -113,17 +130,17 @@ int select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struc
     /* Now set up the return values */
     if (readfds)
     {
-        memset(readfds, 0, sizeof(fd_set));
+        fdszero(readfds, nfds);
     }
 
     if (writefds)
     {
-        memset(writefds, 0, sizeof(fd_set));
+        fdszero(writefds, nfds);
     }
 
     if (exceptfds)
     {
-        memset(exceptfds, 0, sizeof(fd_set));
+        fdszero(exceptfds, nfds);
     }
 
     /* Convert the poll descriptor list back into selects 3 bitsets */

components/lwp/lwp_syscall.c

@@ -27,6 +27,8 @@
 #include <lwp_syscall.h>
 
 #include <dfs_poll.h>
+#include <dfs_select.h>
+
 #if (defined(RT_USING_SAL) && defined(SAL_USING_POSIX))
 #include <sys/socket.h>
 
@@ -235,7 +237,7 @@ const static void* func_table[] =
 
     (void *)sys_gettimeofday,   // 0x0b
     (void *)sys_settimeofday,   // 0x0c
-        
+
     (void *)sys_malloc,         // 0x0d
     (void *)sys_free,           // 0x0e
     (void *)sys_realloc,      //0x0f
@@ -256,6 +258,8 @@ const static void* func_table[] =
     SYSCALL_NET(send),       // 0x1d
     SYSCALL_NET(sendto),     // 0x1e
     SYSCALL_NET(socket),     // 0x1f
+
+    select,                  // 0x20
 };
 
 const void *lwp_get_sys_api(rt_uint32_t number)

tools/iar.py

@@ -49,31 +49,31 @@ def IARAddGroup(parent, name, files, project_path):
     group = SubElement(parent, 'group')
     group_name = SubElement(group, 'name')
     group_name.text = name
-    
+
     for f in files:
         fn = f.rfile()
         name = fn.name
         path = os.path.dirname(fn.abspath)
-    
         basename = os.path.basename(path)
         path = _make_path_relative(project_path, path)
         path = os.path.join(path, name)
-        
+
         file = SubElement(group, 'file')
         file_name = SubElement(file, 'name')
+
         if os.path.isabs(path):
             file_name.text = path.decode(fs_encoding)
         else:
             file_name.text = ('$PROJ_DIR$\\' + path).decode(fs_encoding)
 
 def IARWorkspace(target):
-    # make an workspace 
+    # make an workspace
     workspace = target.replace('.ewp', '.eww')
     out = file(workspace, 'wb')
     xml = iar_workspace % target
     out.write(xml)
     out.close()
-    
+
 def IARProject(target, script):
     project_path = os.path.dirname(os.path.abspath(target))
 
@@ -87,7 +87,19 @@ def IARProject(target, script):
     LINKFLAGS = ''
     CCFLAGS = ''
     Libs = []
-    
+    lib_prefix = ['lib', '']
+    lib_suffix = ['.a', '.o', '']
+
+    def searchLib(group):
+        for path_item in group['LIBPATH']:
+            for prefix_item in lib_prefix:
+                for suffix_item in lib_suffix:
+                    lib_full_path = os.path.join(path_item, prefix_item + item + suffix_item)
+                    if os.path.isfile(lib_full_path):
+                        return lib_full_path
+        else:
+            return ''
+
     # add group
     for group in script:
         IARAddGroup(root, group['name'], group['src'], project_path)
@@ -95,29 +107,26 @@ def IARProject(target, script):
         # get each include path
         if group.has_key('CPPPATH') and group['CPPPATH']:
             CPPPATH += group['CPPPATH']
-        
+
         # get each group's definitions
         if group.has_key('CPPDEFINES') and group['CPPDEFINES']:
             CPPDEFINES += group['CPPDEFINES']
-        
+
         # get each group's link flags
         if group.has_key('LINKFLAGS') and group['LINKFLAGS']:
             LINKFLAGS += group['LINKFLAGS']
-            
+
         if group.has_key('LIBS') and group['LIBS']:
             for item in group['LIBS']:
-                lib_path = ''
+                lib_path = searchLib(group)
-
-                for path_item in group['LIBPATH']:
-                    full_path = os.path.join(path_item, item + '.a')
-                    if os.path.isfile(full_path): # has this library
-                        lib_path = full_path
-
                 if lib_path != '':
                     lib_path = _make_path_relative(project_path, lib_path)
                     Libs += [lib_path]
+                    # print('found lib isfile: ' + lib_path)
+                else:
+                    print('not found LIB: ' + item)
 
-    # make relative path 
+    # make relative path
     paths = set()
     for path in CPPPATH:
         inc = _make_path_relative(project_path, os.path.normpath(path))
@@ -156,7 +165,7 @@ def IARProject(target, script):
     out.close()
 
     IARWorkspace(target)
-    
+
 def IARVersion():
     import subprocess
     import re