diff --git a/README.md b/README.md
index 0701ac5..0afe8fe 100644
--- a/README.md
+++ b/README.md
@@ -91,11 +91,12 @@ A (mostly) complete* list of Tuya wireless module boards.
 
 ```
 arduino/
-├─ <platform name>/             Arduino Core for specific platform
-│  ├─ cores/                        Core files
-│  ├─ libraries/                    Supported built-in libraries
+├─ <platform name>/             Arduino Core for specific SoC
+│  ├─ cores/                        Wiring core files
+│  ├─ libraries/                    Supported built-in platform libraries
 ├─ libretuya/
-│  ├─ api/                      LibreTuya API for Arduino frameworks
+│  ├─ api/                      LibreTuya API (interfaces + LT class) for Arduino frameworks
+│  ├─ common/                   Units common to all platforms
 │  ├─ compat/                   Fixes for compatibility with ESP32 framework
 │  ├─ libraries/                Built-in platform-independent libraries
 boards/
@@ -109,6 +110,7 @@ builder/
 │  ├─ <platform name>-arduino.py    Arduino Core build system
 ├─ arduino-common.py            Builder to provide ArduinoCore-API and LibreTuya APIs
 ├─ main.py                      Main PlatformIO builder
+├─ utils.py                     SCons utils used during the build
 docs/                           Project documentation, guides, tips, etc.
 platform/
 ├─ <platform name>/             Platform-specific configurations
diff --git a/docs/platform/realtek-ambz/stdlib.md b/docs/platform/realtek-ambz/stdlib.md
new file mode 100644
index 0000000..17caa3b
--- /dev/null
+++ b/docs/platform/realtek-ambz/stdlib.md
@@ -0,0 +1,189 @@
+# C library
+
+The following is an auto-generated list of C standard library definitions included in the SDK. `Location` column contains the location of a matching symbol.
+
+## ctype.h
+
+### Character classification functions
+
+Definition | Value      | Location
+-----------|------------|---------
+`isalnum`  |            |
+`isalpha`  |            |
+`isblank`  |            |
+`iscntrl`  |            |
+`isdigit`  | `in_range` |
+`isgraph`  |            |
+`islower`  | `in_range` |
+`isprint`  | `in_range` |
+`ispunct`  |            |
+`isspace`  |            |
+`isupper`  |            |
+`isxdigit` |            |
+
+## stdarg.h
+
+Definition | Value                | Location
+-----------|----------------------|---------
+`va_start` | `__builtin_va_start` |
+`va_arg`   | `__builtin_va_arg`   |
+`va_end`   | `__builtin_va_end`   |
+`va_copy`  | `__builtin_va_copy`  |
+
+## stddef.h
+
+Definition    | Value               | Location
+--------------|---------------------|---------
+`ptrdiff_t`   | `long int`          |
+`size_t`      | `long unsigned int` |
+`max_align_t` |                     |
+`nullptr_t`   |                     |
+`NULL`        |                     |
+
+## stdint.h
+
+### Types
+
+Definition       | Value                | Location
+-----------------|----------------------|---------
+`intmax_t`       | `long int`           |
+`uintmax_t`      | `long unsigned int`  |
+`int8_t`         | `signed char`        |
+`uint8_t`        | `unsigned char`      |
+`int16_t`        | `short int`          |
+`uint16_t`       | `short unsigned int` |
+`int32_t`        | `int`                |
+`uint32_t`       | `unsigned int`       |
+`int64_t`        | `long int`           |
+`uint64_t`       | `long unsigned int`  |
+`int_least8_t`   | `signed char`        |
+`uint_least8_t`  | `unsigned char`      |
+`int_least16_t`  | `short int`          |
+`uint_least16_t` | `short unsigned int` |
+`int_least32_t`  | `int`                |
+`uint_least32_t` | `unsigned int`       |
+`int_least64_t`  | `long int`           |
+`uint_least64_t` | `long unsigned int`  |
+`int_fast8_t`    | `signed char`        |
+`uint_fast8_t`   | `unsigned char`      |
+`int_fast16_t`   | `long int`           |
+`uint_fast16_t`  | `long unsigned int`  |
+`int_fast32_t`   | `long int`           |
+`uint_fast32_t`  | `long unsigned int`  |
+`int_fast64_t`   | `long int`           |
+`uint_fast64_t`  | `long unsigned int`  |
+`intptr_t`       | `long int`           |
+`uintptr_t`      | `long unsigned int`  |
+
+## stdio.h
+
+### Formatted input/output
+
+Definition  | Value           | Location
+------------|-----------------|-----------------
+`fprintf`   |                 |
+`fscanf`    |                 |
+`printf`    | `rtl_printf`    | `lib_rtlstd.a`
+`scanf`     |                 |
+`snprintf`  | `rtl_snprintf`  | `lib_rtlstd.a`
+`sprintf`   | `rtl_sprintf`   | `lib_rtlstd.a`
+`sscanf`    | `_sscanf_patch` | `lib_platform.a`
+`vfprintf`  |                 |
+`vfscanf`   |                 |
+`vprintf`   |                 |
+`vscanf`    |                 |
+`vsnprintf` | `rtl_vsnprintf` | `lib_rtlstd.a`
+`vsprintf`  |                 |
+`vsscanf`   |                 |
+
+### Error-handling
+
+Definition | Value         | Location
+-----------|---------------|-------------
+`clearerr` | `__sclearerr` |
+`feof`     | `__sfeof`     |
+`ferror`   | `__sferror`   |
+`perror`   |               | `lib_mdns.a`
+
+## stdlib.h
+
+### String conversion
+
+Definition | Value            | Location
+-----------|------------------|---------
+`atof`     |                  |
+`atoi`     | `prvAtoi`        | ROM
+`atol`     | `simple_strtol`  | ROM
+`atoll`    |                  |
+`strtod`   |                  |
+`strtof`   |                  |
+`strtol`   | `simple_strtol`  | ROM
+`strtold`  |                  |
+`strtoll`  |                  |
+`strtoul`  | `simple_strtoul` | ROM
+`strtoull` |                  |
+
+### Pseudo-random sequence generation
+
+Definition | Value  | Location
+-----------|--------|---------
+`rand`     | `Rand` | ROM
+`srand`    |        |
+
+### Dynamic memory management
+
+Definition | Value          | Location
+-----------|----------------|---------
+`calloc`   |                |
+`free`     | `vPortFree`    | SDK
+`malloc`   | `pvPortMalloc` | SDK
+`realloc`  |                |
+
+## string.h
+
+### Copying
+
+Definition | Value                 | Location
+-----------|-----------------------|---------
+`memcpy`   | `_memcpy`             | ROM
+`memmove`  | `__rtl_memmove_v1_00` | ROM
+`strcpy`   | `_strcpy`             | ROM
+`strncpy`  | `_strncpy`            | ROM
+
+### Concatenation
+
+Definition | Value                 | Location
+-----------|-----------------------|---------
+`strcat`   | `__rtl_strcat_v1_00`  | ROM
+`strncat`  | `__rtl_strncat_v1_00` | ROM
+
+### Comparison
+
+Definition | Value       | Location
+-----------|-------------|---------
+`memcmp`   | `_memcmp`   | ROM
+`strcmp`   | `prvStrCmp` | ROM
+`strcoll`  |             |
+`strncmp`  | `_strncmp`  | ROM
+`strxfrm`  |             |
+
+### Searching
+
+Definition | Value                | Location
+-----------|----------------------|---------
+`memchr`   | `__rtl_memchr_v1_00` | ROM
+`strchr`   | `_strchr`            | ROM
+`strcspn`  |                      |
+`strpbrk`  | `_strpbrk`           | ROM
+`strrchr`  |                      |
+`strspn`   |                      |
+`strstr`   | `prvStrStr`          | ROM
+`strtok`   | `prvStrtok`          | ROM
+
+### Other
+
+Definition | Value       | Location
+-----------|-------------|---------
+`memset`   | `_memset`   | ROM
+`strerror` |             |
+`strlen`   | `prvStrLen` | ROM
diff --git a/mkdocs.yml b/mkdocs.yml
index 8780daa..cf6b277 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -19,7 +19,8 @@ nav:
       - "Realtek AmebaZ Series":
           - "Boards":
               - "WR3": "boards/wr3/README.md"
-          - "stdlib usage":
+          - "C library":
+              - "Built-in functions": "docs/platform/realtek-ambz/stdlib.md"
               - "Memory management": "docs/platform/realtek-ambz/memory-management.md"
           - "Debugging": "docs/platform/realtek/debugging.md"
           - "Exception decoder": "docs/platform/realtek/exception-decoder.md"