Update i2c driver, add read ACK and BUS status check

26 files changed, 261 insertions, 599 deletions

diff --git a/components/libc/compilers/dlib/README.md b/components/libc/compilers/dlib/README.md
index acd08f9074..e4d70e8135 100644
--- a/components/libc/compilers/dlib/README.md
+++ b/components/libc/compilers/dlib/README.md
@@ -1,9 +1,3 @@
 # DLIB (IAR) porting for RT-Thread
 
-Please define RT_USING_LIBC and compile RT-Thread with IAR compiler.
-
-
-
-## More Information
-
 http://www.iarsys.co.jp/download/LMS2/arm/7502/ewarm7502doc/arm/doc/EWARM_DevelopmentGuide.ENU.pdf    P.130
\ No newline at end of file
diff --git a/components/libc/compilers/dlib/SConscript b/components/libc/compilers/dlib/SConscript
index 75a5812fab..e11ea65b97 100644
--- a/components/libc/compilers/dlib/SConscript
+++ b/components/libc/compilers/dlib/SConscript
@@ -1,26 +1,20 @@
 from building import *
-
 Import('rtconfig')
 
 src   = Glob('*.c')
-cwd   = GetCurrentDir()
 group = []
 
-CPPPATH    = [cwd]
 CPPDEFINES = ['RT_USING_DLIBC']
 
 if rtconfig.PLATFORM == 'iar':
-
-    if GetDepend('RT_USING_DFS'):
+    if GetDepend('DFS_USING_POSIX'):
         from distutils.version import LooseVersion
         from iar import IARVersion
 
         CPPDEFINES = CPPDEFINES + ['_DLIB_FILE_DESCRIPTOR']
-
         if LooseVersion(IARVersion()) < LooseVersion("8.20.1"):
             CPPDEFINES = CPPDEFINES + ['_DLIB_THREAD_SUPPORT']
 
-    group = DefineGroup('libc', src, depend = ['RT_USING_LIBC'], 
-        CPPPATH = CPPPATH, CPPDEFINES = CPPDEFINES)
+    group = DefineGroup('Compiler', src, depend = [''], CPPDEFINES = CPPDEFINES)
 
 Return('group')
diff --git a/components/libc/compilers/dlib/dirent.h b/components/libc/compilers/dlib/dirent.h
deleted file mode 100644
index 4c897cc550..0000000000
--- a/components/libc/compilers/dlib/dirent.h
+++ /dev/null
@@ -1,62 +0,0 @@
-/*
- * Copyright (c) 2006-2018, RT-Thread Development Team
- *
- * SPDX-License-Identifier: Apache-2.0
- *
- * Change Logs:
- * Date           Author       Notes
- */
-#ifndef __RTT_DIRENT_H__
-#define __RTT_DIRENT_H__
-
-#include <rtthread.h>
-#include <rtlibc.h>
-
-/*
-* dirent.h - format of directory entries
- * Ref: http://www.opengroup.org/onlinepubs/009695399/basedefs/dirent.h.html
- */
-
-/* File types */
-#define FT_REGULAR      0   /* regular file */
-#define FT_SOCKET       1   /* socket file  */
-#define FT_DIRECTORY    2   /* directory    */
-#define FT_USER         3   /* user defined */
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#ifndef HAVE_DIR_STRUCTURE
-typedef struct
-{
-    int fd;                         /* directory file */
-    char buf[512];
-    int num;
-    int cur;
-} DIR;
-#endif
-
-#ifndef HAVE_DIRENT_STRUCTURE
-struct dirent
-{
-    rt_uint8_t  d_type;             /* The type of the file */
-    rt_uint8_t  d_namlen;           /* The length of the not including the terminating null file name */
-    rt_uint16_t d_reclen;           /* length of this record */
-    char d_name[256];               /* The null-terminated file name */
-};
-#endif
-
-int            closedir(DIR *);
-DIR           *opendir(const char *);
-struct dirent *readdir(DIR *);
-int            readdir_r(DIR *, struct dirent *, struct dirent **);
-void           rewinddir(DIR *);
-void           seekdir(DIR *, long int);
-long           telldir(DIR *);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif
diff --git a/components/libc/compilers/dlib/environ.c b/components/libc/compilers/dlib/environ.c
index ac19758838..84b04fda55 100644
--- a/components/libc/compilers/dlib/environ.c
+++ b/components/libc/compilers/dlib/environ.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
diff --git a/components/libc/compilers/dlib/fcntl.h b/components/libc/compilers/dlib/fcntl.h
deleted file mode 100644
index ce95230e88..0000000000
--- a/components/libc/compilers/dlib/fcntl.h
+++ /dev/null
@@ -1,8 +0,0 @@
-/*
- * Copyright (c) 2006-2018, RT-Thread Development Team
- *
- * SPDX-License-Identifier: Apache-2.0
- *
- * Change Logs:
- * Date           Author       Notes
- */
diff --git a/components/libc/compilers/dlib/libc.c b/components/libc/compilers/dlib/libc.c
deleted file mode 100644
index 8b42411a6b..0000000000
--- a/components/libc/compilers/dlib/libc.c
+++ /dev/null
@@ -1,44 +0,0 @@
-/*
- * Copyright (c) 2006-2018, RT-Thread Development Team
- *
- * SPDX-License-Identifier: Apache-2.0
- *
- * Change Logs:
- * Date           Author       Notes
- * 2017/10/15     bernard      the first version
- */
-#include <stdio.h>
-#include <stdlib.h>
-
-#include <rtthread.h>
-
-#include "libc.h"
-
-#ifdef RT_USING_PTHREADS
-#include <pthread.h>
-#endif
-
-int libc_system_init(void)
-{
-#if defined(RT_USING_DFS) && defined(RT_USING_DFS_DEVFS)
-    rt_device_t dev_console;
-
-    dev_console = rt_console_get_device();
-    if (dev_console)
-    {
-    #if defined(RT_USING_POSIX)
-        libc_stdio_set_console(dev_console->parent.name, O_RDWR);
-    #else
-        libc_stdio_set_console(dev_console->parent.name, O_WRONLY);
-    #endif
-    }
-#endif
-
-#if defined (RT_USING_PTHREADS) && !defined (RT_USING_COMPONENTS_INIT)
-    pthread_system_init();
-#endif
-
-    return 0;
-}
-INIT_COMPONENT_EXPORT(libc_system_init);
-
diff --git a/components/libc/compilers/dlib/libc.h b/components/libc/compilers/dlib/libc.h
deleted file mode 100644
index 5b46bee0c8..0000000000
--- a/components/libc/compilers/dlib/libc.h
+++ /dev/null
@@ -1,29 +0,0 @@
-/*
- * Copyright (c) 2006-2018, RT-Thread Development Team
- *
- * SPDX-License-Identifier: Apache-2.0
- *
- * Change Logs:
- * Date           Author       Notes
- * 2017/10/15     bernard      the first version
- */
-
-#ifndef __RTT_LIBC_H__
-#define __RTT_LIBC_H__
-
-#include <stddef.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-int libc_system_init(void);
-
-int libc_stdio_set_console(const char* device_name, int mode);
-int libc_stdio_get_console(void);
-int libc_stdio_read(void* buffer, size_t size);
-int libc_stdio_write(const void* buffer, size_t size);
-#ifdef __cplusplus
-}
-#endif
-
-#endif
diff --git a/components/libc/compilers/dlib/rmtx.c b/components/libc/compilers/dlib/rmtx.c
deleted file mode 100644
index 69405c8f6a..0000000000
--- a/components/libc/compilers/dlib/rmtx.c
+++ /dev/null
@@ -1,60 +0,0 @@
-/*
- * Copyright (c) 2006-2018, RT-Thread Development Team
- *
- * SPDX-License-Identifier: Apache-2.0
- *
- * Change Logs:
- * Date           Author       Notes
- * 2015-01-28     Bernard      first version
- */
-#include <rtthread.h>
-#include <yfuns.h>
-
-/*
- * for IAR compiler, we recommand to define _DLIB_THREAD_SUPPORT
- * as 2 for dlib multi-thread support.
- */
-
-#if _DLIB_THREAD_SUPPORT
-typedef void* _Rmtx;
-void _Mtxinit(_Rmtx *m)
-{
-    rt_mutex_t mutex;
-
-    RT_ASSERT(m != RT_NULL);
-    
-    mutex = (rt_mutex_t)m;
-    rt_mutex_init(mutex, "iarMtx", RT_IPC_FLAG_FIFO);
-}
-
-void _Mtxdst(_Rmtx *m)
-{
-    rt_mutex_t mutex;
-
-    RT_ASSERT(m != RT_NULL);
-
-    mutex = (rt_mutex_t)m;
-    rt_mutex_detach(mutex);
-}
-
-void _Mtxlock(_Rmtx *m)
-{
-    rt_mutex_t mutex;
-
-    RT_ASSERT(m != RT_NULL);
-
-    mutex = (rt_mutex_t)m;
-    rt_mutex_take(mutex, RT_WAITING_FOREVER);
-}
-
-void _Mtxunlock(_Rmtx *m)
-{
-    rt_mutex_t mutex;
-
-    RT_ASSERT(m != RT_NULL);
-
-    mutex = (rt_mutex_t)m;
-    rt_mutex_release(mutex);
-}
-#endif
-
diff --git a/components/libc/compilers/dlib/stdio.c b/components/libc/compilers/dlib/stdio.c
deleted file mode 100644
index b35ade7a38..0000000000
--- a/components/libc/compilers/dlib/stdio.c
+++ /dev/null
@@ -1,58 +0,0 @@
-/*
- * Copyright (c) 2006-2018, RT-Thread Development Team
- *
- * SPDX-License-Identifier: Apache-2.0
- *
- * Change Logs:
- * Date           Author       Notes
- * 2017/10/15     bernard      implement stdio for IAR dlib.
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include <rtthread.h>
-#include "libc.h"
-
-#if defined(RT_USING_DFS) && defined(RT_USING_DFS_DEVFS)
-#include <dfs_posix.h>
-
-#define STDIO_DEVICE_NAME_MAX   32
-
-static int std_fd = -1;
-int libc_stdio_set_console(const char* device_name, int mode)
-{
-    int fd;
-    char name[STDIO_DEVICE_NAME_MAX];
-
-    snprintf(name, sizeof(name) - 1, "/dev/%s", device_name);
-    name[STDIO_DEVICE_NAME_MAX - 1] = '\0';
-
-    fd = open(name, mode, 0);
-    if (fd >= 0)
-    {
-        if (std_fd >= 0)
-        {
-            close(std_fd);
-        }
-        std_fd = fd;
-    }
-
-    return std_fd;
-}
-
-int libc_stdio_get_console(void) {
-    return std_fd;
-}
-
-int libc_stdio_read(void *buffer, size_t size)
-{
-    return read(std_fd, buffer, size);
-}
-
-int libc_stdio_write(const void *buffer, size_t size)
-{
-    return write(std_fd, buffer, size);
-}
-#endif
diff --git a/components/libc/compilers/dlib/sys/README.md b/components/libc/compilers/dlib/sys/README.md
deleted file mode 100644
index 4f0d203180..0000000000
--- a/components/libc/compilers/dlib/sys/README.md
+++ /dev/null
@@ -1 +0,0 @@
-Because IAR leaks some system header file, we put them in here. 
\ No newline at end of file
diff --git a/components/libc/compilers/dlib/sys/errno.h b/components/libc/compilers/dlib/sys/errno.h
deleted file mode 100644
index 1ad4c8acc0..0000000000
--- a/components/libc/compilers/dlib/sys/errno.h
+++ /dev/null
@@ -1,16 +0,0 @@
-/*
- * Copyright (c) 2006-2018, RT-Thread Development Team
- *
- * SPDX-License-Identifier: Apache-2.0
- *
- * Change Logs:
- * Date           Author       Notes
- * 2019-07-08     Bernard      The first version
- */
-
-#ifndef SYS_ERRNO_H__
-#define SYS_ERRNO_H__
-
-#include <errno.h>
-
-#endif
diff --git a/components/libc/compilers/dlib/sys/mman.h b/components/libc/compilers/dlib/sys/mman.h
deleted file mode 100644
index 8c61b32b7c..0000000000
--- a/components/libc/compilers/dlib/sys/mman.h
+++ /dev/null
@@ -1,58 +0,0 @@
-/*
- * Copyright (c) 2006-2018, RT-Thread Development Team
- *
- * SPDX-License-Identifier: Apache-2.0
- *
- * Change Logs:
- * Date           Author       Notes
- * 2017/11/30     Bernard      The first version.
- */
-
-#ifndef _SYS_MMAN_H
-#define _SYS_MMAN_H
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#define MAP_FAILED     ((void *) -1)
-
-#define MAP_SHARED     0x01
-#define MAP_PRIVATE    0x02
-#define MAP_TYPE       0x0f
-#define MAP_FIXED      0x10
-#define MAP_ANON       0x20
-#define MAP_ANONYMOUS  MAP_ANON
-#define MAP_NORESERVE  0x4000
-#define MAP_GROWSDOWN  0x0100
-#define MAP_DENYWRITE  0x0800
-#define MAP_EXECUTABLE 0x1000
-#define MAP_LOCKED     0x2000
-#define MAP_POPULATE   0x8000
-#define MAP_NONBLOCK   0x10000
-#define MAP_STACK      0x20000
-#define MAP_HUGETLB    0x40000
-#define MAP_FILE       0
-
-#define PROT_NONE      0
-#define PROT_READ      1
-#define PROT_WRITE     2
-#define PROT_EXEC      4
-#define PROT_GROWSDOWN 0x01000000
-#define PROT_GROWSUP   0x02000000
-
-#define MS_ASYNC       1
-#define MS_INVALIDATE  2
-#define MS_SYNC        4
-
-#define MCL_CURRENT    1
-#define MCL_FUTURE     2
-#define MCL_ONFAULT    4
-
-void *mmap (void *start, size_t len, int prot, int flags, int fd, off_t off);
-int munmap (void *start, size_t len);
-
-#ifdef __cplusplus
-}
-#endif
-#endif
diff --git a/components/libc/compilers/dlib/sys/signal.h b/components/libc/compilers/dlib/sys/signal.h
deleted file mode 100644
index 22adb1228b..0000000000
--- a/components/libc/compilers/dlib/sys/signal.h
+++ /dev/null
@@ -1,16 +0,0 @@
-/*
- * Copyright (c) 2006-2018, RT-Thread Development Team
- *
- * SPDX-License-Identifier: Apache-2.0
- *
- * Change Logs:
- * Date           Author       Notes
- * 2019-07-08     Bernard      The first version
- */
-
-#ifndef SYS_SIGNAL_H__
-#define SYS_SIGNAL_H__
-
-#include <libc/libc_signal.h>
-
-#endif
diff --git a/components/libc/compilers/dlib/sys/stat.h b/components/libc/compilers/dlib/sys/stat.h
deleted file mode 100644
index ce95230e88..0000000000
--- a/components/libc/compilers/dlib/sys/stat.h
+++ /dev/null
@@ -1,8 +0,0 @@
-/*
- * Copyright (c) 2006-2018, RT-Thread Development Team
- *
- * SPDX-License-Identifier: Apache-2.0
- *
- * Change Logs:
- * Date           Author       Notes
- */
diff --git a/components/libc/compilers/dlib/sys/types.h b/components/libc/compilers/dlib/sys/types.h
deleted file mode 100644
index 7dbeddcaa9..0000000000
--- a/components/libc/compilers/dlib/sys/types.h
+++ /dev/null
@@ -1,25 +0,0 @@
-/*
- * Copyright (c) 2006-2018, RT-Thread Development Team
- *
- * SPDX-License-Identifier: Apache-2.0
- *
- * Change Logs:
- * Date           Author       Notes
- * 2020-12-16     Meco Man     add useconds_t
- */
-#ifndef __TYPES_H__
-#define __TYPES_H__
-
-#include <stdint.h>
-
-typedef int32_t          clockid_t;
-typedef int32_t          key_t;         /* Used for interprocess communication. */
-typedef int32_t          pid_t;         /* Used for process IDs and process group IDs. */
-#ifndef ARCH_CPU_64BIT
-typedef signed int       ssize_t;       /* Used for a count of bytes or an error indication. */
-#else
-typedef long signed int  ssize_t;       /* Used for a count of bytes or an error indication. */
-#endif
-typedef unsigned long    useconds_t;    /* microseconds (unsigned) */
-
-#endif
diff --git a/components/libc/compilers/dlib/sys/unistd.h b/components/libc/compilers/dlib/sys/unistd.h
deleted file mode 100644
index 6d99cd6c55..0000000000
--- a/components/libc/compilers/dlib/sys/unistd.h
+++ /dev/null
@@ -1,50 +0,0 @@
-/*
- * Copyright (c) 2006-2018, RT-Thread Development Team
- *
- * SPDX-License-Identifier: Apache-2.0
- *
- * Change Logs:
- * Date           Author       Notes
- * 2020-12-16     Meco Man     add usleep
- */
-#ifndef _SYS_UNISTD_H
-#define _SYS_UNISTD_H
-
-#include <rtconfig.h>
-#include "types.h"
-
-#ifdef RT_USING_DFS
-
-#define STDIN_FILENO    0       /* standard input file descriptor */
-#define STDOUT_FILENO   1       /* standard output file descriptor */
-#define STDERR_FILENO   2       /* standard error file descriptor */
-
-#include <dfs_posix.h>
-#else
-#define	_FREAD		0x0001	/* read enabled */
-#define	_FWRITE		0x0002	/* write enabled */
-#define	_FAPPEND	0x0008	/* append (writes guaranteed at the end) */
-#define	_FMARK		0x0010	/* internal; mark during gc() */
-#define	_FDEFER		0x0020	/* internal; defer for next gc pass */
-#define	_FASYNC		0x0040	/* signal pgrp when data ready */
-#define	_FSHLOCK	0x0080	/* BSD flock() shared lock present */
-#define	_FEXLOCK	0x0100	/* BSD flock() exclusive lock present */
-#define	_FCREAT		0x0200	/* open with file create */
-#define	_FTRUNC		0x0400	/* open with truncation */
-#define	_FEXCL		0x0800	/* error on open if file exists */
-#define	_FNBIO		0x1000	/* non blocking I/O (sys5 style) */
-#define	_FSYNC		0x2000	/* do all writes synchronously */
-#define	_FNONBLOCK	0x4000	/* non blocking I/O (POSIX style) */
-#define	_FNDELAY	_FNONBLOCK	/* non blocking I/O (4.2 style) */
-#define	_FNOCTTY	0x8000	/* don't assign a ctty on this open */
-
-#endif
-
-
-int     isatty      (int fd);
-char *  ttyname     (int desc);
-
-unsigned int sleep(unsigned int seconds);
-int usleep(useconds_t usec);
-
-#endif /* _SYS_UNISTD_H */
diff --git a/components/libc/compilers/dlib/syscall_close.c b/components/libc/compilers/dlib/syscall_close.c
index f46162deb7..736023023d 100644
--- a/components/libc/compilers/dlib/syscall_close.c
+++ b/components/libc/compilers/dlib/syscall_close.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -7,23 +7,32 @@
  * Date           Author       Notes
  * 2015-01-28     Bernard      first version
  */
+
 #include <rtthread.h>
-#ifdef RT_USING_DFS
-#include <dfs_posix.h>
-#endif
-#include <yfuns.h>
+#include <LowLevelIOInterface.h>
+#include <unistd.h>
+#include <compiler_private.h>
+#define DBG_TAG    "dlib.syscall.close"
+#define DBG_LVL    DBG_INFO
+#include <rtdbg.h>
+
+/*
+ * The "__close" function should close the file corresponding to
+ * "handle".  It should return 0 on success and nonzero on failure.
+ */
 
 #pragma module_name = "?__close"
+
 int __close(int handle)
 {
     if (handle == _LLIO_STDOUT ||
         handle == _LLIO_STDERR ||
         handle == _LLIO_STDIN)
         return _LLIO_ERROR;
-
-#ifdef RT_USING_DFS
+#ifdef DFS_USING_POSIX
     return close(handle);
 #else
-    return 0;
-#endif
+    LOG_W(_WARNING_WITHOUT_FS);
+    return _LLIO_ERROR;
+#endif /* DFS_USING_POSIX */
 }
diff --git a/components/libc/compilers/dlib/syscall_lseek.c b/components/libc/compilers/dlib/syscall_lseek.c
index b79cc410b7..b2c47e71c9 100644
--- a/components/libc/compilers/dlib/syscall_lseek.c
+++ b/components/libc/compilers/dlib/syscall_lseek.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -7,23 +7,41 @@
  * Date           Author       Notes
  * 2015-01-28     Bernard      first version
  */
+
 #include <rtthread.h>
-#ifdef RT_USING_DFS
-#include <dfs_posix.h>
-#endif
-#include <yfuns.h>
+#include <LowLevelIOInterface.h>
+#include <unistd.h>
+#include <compiler_private.h>
+#define DBG_TAG    "dlib.syscall.lseek"
+#define DBG_LVL    DBG_INFO
+#include <rtdbg.h>
+
+/*
+ * The "__lseek" function makes the next file operation (__read or
+ * __write) act on a new location.  The parameter "whence" specifies
+ * how the "offset" parameter should be interpreted according to the
+ * following table:
+ *
+ *  0 (=SEEK_SET) - Goto location "offset".
+ *  1 (=SEEK_CUR) - Go "offset" bytes from the current location.
+ *  2 (=SEEK_END) - Go to "offset" bytes from the end.
+ *
+ * This function should return the current file position, or -1 on
+ * failure.
+ */
 
 #pragma module_name = "?__lseek"
+
 long __lseek(int handle, long offset, int whence)
 {
     if (handle == _LLIO_STDOUT ||
         handle == _LLIO_STDERR ||
         handle == _LLIO_STDIN)
         return _LLIO_ERROR;
-
-#ifdef RT_USING_DFS
+#ifdef DFS_USING_POSIX
     return lseek(handle, offset, whence);
 #else
+    LOG_W(_WARNING_WITHOUT_FS);
     return _LLIO_ERROR;
-#endif
+#endif /* DFS_USING_POSIX */
 }
diff --git a/components/libc/compilers/dlib/syscall_mem.c b/components/libc/compilers/dlib/syscall_mem.c
index 236ef1c12d..2de0974e4e 100644
--- a/components/libc/compilers/dlib/syscall_mem.c
+++ b/components/libc/compilers/dlib/syscall_mem.c
@@ -1,32 +1,61 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
  * 2015-01-28     Bernard      first version
+ * 2021-11-13     Meco Man     implement no-heap warning
  */
+
 #include <rtthread.h>
+#include <stddef.h>
 
-#ifdef RT_USING_HEAP
-void *malloc(rt_size_t n)
+#ifndef RT_USING_HEAP
+#define DBG_TAG    "dlib.syscall.mem"
+#define DBG_LVL    DBG_INFO
+#include <rtdbg.h>
+#define _NO_HEAP_ERROR()  do{LOG_E("Please enable RT_USING_HEAP");\
+                             RT_ASSERT(0);\
+                            }while(0)
+#endif /* RT_USING_HEAP */
+
+void *malloc(size_t n)
 {
+#ifdef RT_USING_HEAP
     return rt_malloc(n);
+#else
+    _NO_HEAP_ERROR();
+    return RT_NULL;
+#endif
 }
 
-void *realloc(void *rmem, rt_size_t newsize)
+void *realloc(void *rmem, size_t newsize)
 {
+#ifdef RT_USING_HEAP
     return rt_realloc(rmem, newsize);
+#else
+    _NO_HEAP_ERROR();
+    return RT_NULL;
+#endif
 }
 
-void *calloc(rt_size_t nelem, rt_size_t elsize)
+void *calloc(size_t nelem, size_t elsize)
 {
+#ifdef RT_USING_HEAP
     return rt_calloc(nelem, elsize);
+#else
+    _NO_HEAP_ERROR();
+    return RT_NULL;
+#endif
 }
 
 void free(void *rmem)
 {
+#ifdef RT_USING_HEAP
     rt_free(rmem);
-}
+#else
+    _NO_HEAP_ERROR();
 #endif
+}
diff --git a/components/libc/compilers/dlib/syscall_open.c b/components/libc/compilers/dlib/syscall_open.c
index 96e02dc32a..4d557db4b0 100644
--- a/components/libc/compilers/dlib/syscall_open.c
+++ b/components/libc/compilers/dlib/syscall_open.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -9,66 +9,75 @@
 */
 
 #include <rtthread.h>
-#include <yfuns.h>
-#ifdef RT_USING_DFS
-#include <dfs_posix.h>
-#endif
+#include <LowLevelIOInterface.h>
+#include <fcntl.h>
+#include <compiler_private.h>
+#define DBG_TAG    "dlib.syscall.open"
+#define DBG_LVL    DBG_INFO
+#include <rtdbg.h>
+
+/*
+ * The "__open" function opens the file named "filename" as specified
+ * by "mode".
+ */
 
 #pragma module_name = "?__open"
 
 int __open(const char *filename, int mode)
 {
-#ifndef RT_USING_DFS
-  return _LLIO_ERROR;
-#else
-  int handle;
-  int open_mode = O_RDONLY;
-
-  if (mode & _LLIO_CREAT)
-  {
-    open_mode |= O_CREAT;
+#ifdef DFS_USING_POSIX
+    int handle;
+    int open_mode = O_RDONLY;
 
-    /* Check what we should do with it if it exists. */
-    if (mode & _LLIO_APPEND)
+    if (mode & _LLIO_CREAT)
     {
-      /* Append to the existing file. */
-      open_mode |= O_APPEND;
+        open_mode |= O_CREAT;
+
+        /* Check what we should do with it if it exists. */
+        if (mode & _LLIO_APPEND)
+        {
+            /* Append to the existing file. */
+            open_mode |= O_APPEND;
+        }
+
+        if (mode & _LLIO_TRUNC)
+        {
+            /* Truncate the existsing file. */
+            open_mode |= O_TRUNC;
+        }
     }
 
-    if (mode & _LLIO_TRUNC)
+    if (mode & _LLIO_TEXT)
     {
-      /* Truncate the existsing file. */
-      open_mode |= O_TRUNC;
+        /* we didn't support text mode */
     }
-  }
-
-  if (mode & _LLIO_TEXT)
-  {
-    /* we didn't support text mode */
-  }
 
-  switch (mode & _LLIO_RDWRMASK)
-  {
-  case _LLIO_RDONLY:
-    break;
+    switch (mode & _LLIO_RDWRMASK)
+    {
+    case _LLIO_RDONLY:
+        break;
 
-  case _LLIO_WRONLY:
-    open_mode |= O_WRONLY;
-    break;
+    case _LLIO_WRONLY:
+        open_mode |= O_WRONLY;
+        break;
 
-  case _LLIO_RDWR:
-    /* The file should be opened for both reads and writes. */
-    open_mode |= O_RDWR;
-    break;
+    case _LLIO_RDWR:
+        /* The file should be opened for both reads and writes. */
+        open_mode |= O_RDWR;
+        break;
 
-  default:
-    return _LLIO_ERROR;
-  }
+    default:
+        return _LLIO_ERROR;
+    }
 
-  handle = open(filename, open_mode, 0);
-  if (handle < 0)
+    handle = open(filename, open_mode, 0);
+    if (handle < 0)
+    {
+        return _LLIO_ERROR;
+    }
+    return handle;
+#else
+    LOG_W(_WARNING_WITHOUT_FS);
     return _LLIO_ERROR;
-
-  return handle;
-#endif
+#endif /* DFS_USING_POSIX */
 }
diff --git a/components/libc/compilers/dlib/syscall_read.c b/components/libc/compilers/dlib/syscall_read.c
index e248211486..a276a3e401 100644
--- a/components/libc/compilers/dlib/syscall_read.c
+++ b/components/libc/compilers/dlib/syscall_read.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -9,35 +9,57 @@
  */
 
 #include <rtthread.h>
-#ifdef RT_USING_DFS
-#include <dfs_posix.h>
-#endif
-#include <yfuns.h>
+#include <LowLevelIOInterface.h>
+#include <unistd.h>
+#ifdef RT_USING_POSIX_STDIO
 #include "libc.h"
+#endif /* RT_USING_POSIX_STDIO */
+#include <compiler_private.h>
+#define DBG_TAG    "dlib.syscall.read"
+#define DBG_LVL    DBG_INFO
+#include <rtdbg.h>
+
+/*
+ * The "__read" function reads a number of bytes, at most "size" into
+ * the memory area pointed to by "buffer".  It returns the number of
+ * bytes read, 0 at the end of the file, or _LLIO_ERROR if failure
+ * occurs.
+ *
+ * The template implementation below assumes that the application
+ * provides the function "MyLowLevelGetchar".  It should return a
+ * character value, or -1 on failure.
+ */
 
 #pragma module_name = "?__read"
+
 size_t __read(int handle, unsigned char *buf, size_t len)
 {
-#ifdef RT_USING_DFS
+#ifdef DFS_USING_POSIX
     int size;
-#endif
 
     if (handle == _LLIO_STDIN)
     {
-#ifdef RT_USING_POSIX
-        return libc_stdio_read(buf, len);
+#ifdef RT_USING_POSIX_STDIO
+        if (libc_stdio_get_console() < 0)
+        {
+            LOG_W("Do not invoke standard input before initializing Compiler");
+            return 0; /* error, but keep going */
+        }
+        return read(STDIN_FILENO, buf, len); /* return the length of the data read */
 #else
+        LOG_W(_WARNING_WITHOUT_STDIO);
         return _LLIO_ERROR;
-#endif
+#endif /* RT_USING_POSIX_STDIO */
     }
-
-    if ((handle == _LLIO_STDOUT) || (handle == _LLIO_STDERR))
+    else if ((handle == _LLIO_STDOUT) || (handle == _LLIO_STDERR))
+    {
         return _LLIO_ERROR;
+    }
 
-#ifndef RT_USING_DFS
-    return _LLIO_ERROR;
-#else
     size = read(handle, buf, len);
-    return size;
-#endif
+    return size; /* return the length of the data read */
+#else
+    LOG_W(_WARNING_WITHOUT_FS);
+    return _LLIO_ERROR;
+#endif /* DFS_USING_POSIX */
 }
diff --git a/components/libc/compilers/dlib/syscall_remove.c b/components/libc/compilers/dlib/syscall_remove.c
index e7f0268b1b..04230544da 100644
--- a/components/libc/compilers/dlib/syscall_remove.c
+++ b/components/libc/compilers/dlib/syscall_remove.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -7,18 +7,28 @@
  * Date           Author       Notes
  * 2015-01-28     Bernard      first version
  */
+
 #include <rtthread.h>
-#ifdef RT_USING_DFS
-#include <dfs_file.h>
-#endif
-#include <yfuns.h>
+#include <LowLevelIOInterface.h>
+#include <unistd.h>
+#include <compiler_private.h>
+#define DBG_TAG    "dlib.syscall.remove"
+#define DBG_LVL    DBG_INFO
+#include <rtdbg.h>
+
+/*
+ * The "remove" function should remove the file named "filename".  It
+ * should return 0 on success and nonzero on failure.
+ */
 
 #pragma module_name = "?remove"
-int remove(const char *val)
-{
-#ifdef RT_USING_DFS
-    dfs_file_unlink(val);
-#endif
 
-    return 0;
+int remove(const char *filename)
+{
+#ifdef DFS_USING_POSIX
+    return unlink(filename);
+#else
+    LOG_W(_WARNING_WITHOUT_FS);
+    return _LLIO_ERROR;
+#endif /* DFS_USING_POSIX */
 }
diff --git a/components/libc/compilers/dlib/syscall_write.c b/components/libc/compilers/dlib/syscall_write.c
index 85c0da22c3..4eead9aa38 100644
--- a/components/libc/compilers/dlib/syscall_write.c
+++ b/components/libc/compilers/dlib/syscall_write.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -9,46 +9,63 @@
  */
 
 #include <rtthread.h>
-#ifdef RT_USING_DFS
-#include <dfs_posix.h>
-#endif
-#include <yfuns.h>
-#include "libc.h"
+#include <LowLevelIOInterface.h>
+#include <unistd.h>
+#include <compiler_private.h>
+#define DBG_TAG    "dlib.syscall.write"
+#define DBG_LVL    DBG_INFO
+#include <rtdbg.h>
+
+/*
+ * The "__write" function should output "size" number of bytes from
+ * "buffer" in some application-specific way.  It should return the
+ * number of characters written, or _LLIO_ERROR on failure.
+ *
+ * If "buffer" is zero then __write should perform flushing of
+ * internal buffers, if any.  In this case "handle" can be -1 to
+ * indicate that all handles should be flushed.
+ *
+ * The template implementation below assumes that the application
+ * provides the function "MyLowLevelPutchar".  It should return the
+ * character written, or -1 on failure.
+ */
 
 #pragma module_name = "?__write"
 
 size_t __write(int handle, const unsigned char *buf, size_t len)
 {
-#ifdef RT_USING_DFS
+#ifdef DFS_USING_POSIX
     int size;
-#endif
+#endif /* DFS_USING_POSIX */
 
     if ((handle == _LLIO_STDOUT) || (handle == _LLIO_STDERR))
     {
-#ifndef RT_USING_CONSOLE
-        return _LLIO_ERROR;
-#else
-
-#ifdef RT_USING_POSIX
-        return libc_stdio_write((void*)buf, len);
-#else
+#if defined(RT_USING_CONSOLE) && defined(RT_USING_DEVICE)
         rt_device_t console_device;
 
         console_device = rt_console_get_device();
-        if (console_device != 0) rt_device_write(console_device, 0, buf, len);
+        if (console_device)
+        {
+            rt_device_write(console_device, 0, buf, len);
+        }
 
-        return len;
-#endif
-#endif
+        return len; /* return the length of the data written */
+#else
+        return _LLIO_ERROR;
+#endif /* defined(RT_USING_CONSOLE) && defined(RT_USING_DEVICE) */
     }
-
-    if (handle == _LLIO_STDIN) return _LLIO_ERROR;
-
-#ifndef RT_USING_DFS
-    return _LLIO_ERROR;
+    else if (handle == _LLIO_STDIN)
+    {
+        return _LLIO_ERROR;
+    }
+    else
+    {
+#ifdef DFS_USING_POSIX
+        size = write(handle, buf, len);
+        return size; /* return the length of the data written */
 #else
-    size = write(handle, buf, len);
-    return size;
-#endif
+        LOG_W(_WARNING_WITHOUT_FS);
+        return _LLIO_ERROR;
+#endif /* DFS_USING_POSIX */
+    }
 }
-
diff --git a/components/libc/compilers/dlib/syscalls.c b/components/libc/compilers/dlib/syscalls.c
new file mode 100644
index 0000000000..391cbcac8a
--- /dev/null
+++ b/components/libc/compilers/dlib/syscalls.c
@@ -0,0 +1,19 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2021-02-13     Meco Man     implement exit() and abort()
+ */
+
+#include <rtthread.h>
+
+/* for exit() and abort() */
+void __exit (int status)
+{
+    extern void __rt_libc_exit(int status);
+    __rt_libc_exit(status);
+    while(1);
+}
diff --git a/components/libc/compilers/dlib/syscalls.h b/components/libc/compilers/dlib/syscalls.h
deleted file mode 100644
index 993962e8db..0000000000
--- a/components/libc/compilers/dlib/syscalls.h
+++ /dev/null
@@ -1,10 +0,0 @@
-/*
- * Copyright (c) 2006-2018, RT-Thread Development Team
- *
- * SPDX-License-Identifier: Apache-2.0
- *
- * Change Logs:
- * Date           Author       Notes
- * 2015-01-28     Bernard      first version
- */
-
diff --git a/components/libc/compilers/dlib/unistd.h b/components/libc/compilers/dlib/unistd.h
deleted file mode 100644
index a07d8409c2..0000000000
--- a/components/libc/compilers/dlib/unistd.h
+++ /dev/null
@@ -1,14 +0,0 @@
-/*
- * Copyright (c) 2006-2018, RT-Thread Development Team
- *
- * SPDX-License-Identifier: Apache-2.0
- *
- * Change Logs:
- * Date           Author       Notes
- */
-#ifndef _UNISTD_H_
-#define _UNISTD_H_
-
-# include "sys/unistd.h"
-
-#endif /* _UNISTD_H_ */