diff --git a/arduino/libretuya/core/ChipType.h b/arduino/libretuya/core/ChipType.h
index 29f3e4d..b3e9073 100644
--- a/arduino/libretuya/core/ChipType.h
+++ b/arduino/libretuya/core/ChipType.h
@@ -1,23 +1,27 @@
 /* Copyright (c) Kuba Szczodrzyński 2022-05-28. */
 
+#define CHIP_TYPE(family, chip_id)		(((family >> 24) << 8) | chip_id)
+#define CHIP_TYPE_ENUM(family, chip_id) (ChipType) CHIP_TYPE(family, chip_id)
+
 enum ChipFamily {
 	// used in UF2 Family ID
-	RTL8710A = 0x9FFFD543, // Realtek Ameba1
-	RTL8710B = 0x22E0D6FC, // Realtek AmebaZ (realtek-ambz)
-	RTL8720C = 0xE08F7564, // Realtek AmebaZ2
-	RTL8720D = 0x3379CFE2, // Realtek AmebaD
-	BK7231T	 = 0x675A40B0, // Beken 7231T
-	BK7231N	 = 0x7B3EF230, // Beken 7231N
-	BL602	 = 0xDE1270B7, // Boufallo 602
-	XR809	 = 0x51E903A8, // Xradiotech 809
+	F_RTL8710A = 0x9FFFD543, // Realtek Ameba1
+	F_RTL8710B = 0x22E0D6FC, // Realtek AmebaZ (realtek-ambz)
+	F_RTL8720C = 0xE08F7564, // Realtek AmebaZ2
+	F_RTL8720D = 0x3379CFE2, // Realtek AmebaD
+	F_BK7231T  = 0x675A40B0, // Beken 7231T
+	F_BK7231N  = 0x7B3EF230, // Beken 7231N
+	F_BL602	   = 0xDE1270B7, // Boufallo 602
+	F_XR809	   = 0x51E903A8, // Xradiotech 809
 };
 
 enum ChipType {
+	// Realtek AmebaZ
 	// IDs copied from rtl8710b_efuse.h
-	RTL8710BL = ((RTL8710B >> 24) << 8) | 0xE0, // ???
-	RTL8710BN = ((RTL8710B >> 24) << 8) | 0xFF, // CHIPID_8710BN / QFN32
-	RTL8710BU = ((RTL8710B >> 24) << 8) | 0xFE, // CHIPID_8710BU / QFN48
-	RTL8710BX = ((RTL8710B >> 24) << 8) | 0xFB, // CHIPID_8710BN_L0 / QFN32
-	RTL8711BN = ((RTL8710B >> 24) << 8) | 0xFD, // CHIPID_8711BN / QFN48
-	RTL8711BU = ((RTL8710B >> 24) << 8) | 0xFC, // CHIPID_8711BG / QFN68
+	RTL8710BL = CHIP_TYPE(F_RTL8710B, 0xE0), // ???
+	RTL8710BN = CHIP_TYPE(F_RTL8710B, 0xFF), // CHIPID_8710BN / QFN32
+	RTL8710BU = CHIP_TYPE(F_RTL8710B, 0xFE), // CHIPID_8710BU / QFN48
+	RTL8710BX = CHIP_TYPE(F_RTL8710B, 0xFB), // CHIPID_8710BN_L0 / QFN32
+	RTL8711BN = CHIP_TYPE(F_RTL8710B, 0xFD), // CHIPID_8711BN / QFN48
+	RTL8711BU = CHIP_TYPE(F_RTL8710B, 0xFC), // CHIPID_8711BG / QFN68
 };
diff --git a/arduino/libretuya/core/LibreTuyaClass.cpp b/arduino/libretuya/core/LibreTuyaClass.cpp
index b2eeba2..70df6e9 100644
--- a/arduino/libretuya/core/LibreTuyaClass.cpp
+++ b/arduino/libretuya/core/LibreTuyaClass.cpp
@@ -27,7 +27,7 @@ ChipFamily LibreTuya::getChipFamily() {
  * @brief Get CPU family name as string.
  */
 const char *LibreTuya::getChipFamilyName() {
-	return STRINGIFY_MACRO(FAMILY);
+	return STRINGIFY_MACRO(FAMILY) + 2;
 }
 
 static char *deviceName = NULL;
diff --git a/arduino/realtek-ambz/cores/arduino/LibreTuyaAPI.cpp b/arduino/realtek-ambz/cores/arduino/LibreTuyaAPI.cpp
index c716e86..acf964c 100644
--- a/arduino/realtek-ambz/cores/arduino/LibreTuyaAPI.cpp
+++ b/arduino/realtek-ambz/cores/arduino/LibreTuyaAPI.cpp
@@ -24,7 +24,7 @@ void LibreTuya::gpioRecover() {
 ChipType LibreTuya::getChipType() {
 	uint8_t chipId;
 	EFUSE_OneByteReadROM(9902, 0xF8, &chipId, L25EOUTVOLTAGE);
-	return (ChipType)(((RTL8710B >> 24) << 8) | chipId);
+	return CHIP_TYPE_ENUM(F_RTL8710B, chipId);
 }
 
 const char *LibreTuya::getChipModel() {
diff --git a/builder/utils/env.py b/builder/utils/env.py
index 85b99c1..a0577fe 100644
--- a/builder/utils/env.py
+++ b/builder/utils/env.py
@@ -65,7 +65,7 @@ def env_add_defaults(env, platform, board):
             ("LT_BOARD", "${VARIANT}"),
             ("F_CPU", board.get("build.f_cpu")),
             ("MCU", "${MCU}"),
-            ("FAMILY", "${FAMILY}"),
+            ("FAMILY", "F_${FAMILY}"),
         ],
         LINKFLAGS=[
             "-Wl,-Map=" + join("$BUILD_DIR", "${PROGNAME}.map"),
diff --git a/docs/ota/library.md b/docs/ota/library.md
index 5900d7b..c7f3126 100644
--- a/docs/ota/library.md
+++ b/docs/ota/library.md
@@ -5,8 +5,8 @@ uf2ota library allows to write a LibreTuya UF2 file to the flash, while parsing
 ## Usage example
 
 ```c
-uint8_t target	   = 1;		   // target OTA scheme - 1 or 2
-uint32_t family	   = RTL8710B; // chip's UF2 family ID
+uint8_t target	   = 1;			 // target OTA scheme - 1 or 2
+uint32_t family	   = F_RTL8710B; // chip's UF2 family ID
 uf2_ota_t *ctx	   = uf2_ctx_init(target, family);
 uf2_info_t *info   = uf2_info_init(); // optional, for getting firmware info
 uf2_block_t *block = (uf2_block_t *)malloc(UF2_BLOCK_SIZE);