diff --git a/Cargo.toml b/Cargo.toml
index e29411bd663e1797c0a5704b38658ae6d14ac85f..fa3ea64551284ee698cb9da33eda234946090ba5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,10 +11,10 @@ crc = "3.0.1"
 cfg-if = "1.0.0"
 bl-soc = { git = "https://gitee.com/rustsbi/bl-soc", branch = "main", optional = true }
 base-address = { version = "0.0.0", optional = true }
+embedded-time = { version = "0.12.1", optional = true }
 
 [dev-dependencies]
 memoffset = "0.8.0"
-embedded-hal = "1.0.0-alpha.10"
 
 [features]
 default = ["rom-peripherals"]
@@ -27,7 +27,7 @@ bl808-lp = ["bl-soc/bl808"]
 # BL702, BL704 and BL706 chip series.
 bl702 = ["bl-soc/bl702"]
 # Provide ROM peripherals on #[entry] function.
-rom-peripherals = ["bl-rom-rt-macros/rom-peripherals", "dep:bl-soc", "dep:base-address"]
+rom-peripherals = ["bl-rom-rt-macros/rom-peripherals", "dep:bl-soc", "dep:base-address", "dep:embedded-time"]
 
 [workspace]
 members = [
diff --git a/examples/blinky-bl616/Cargo.toml b/examples/blinky-bl616/Cargo.toml
index c377eefb04715fff553237fd0d70126442e3dc05..6a5c738fc29643bc94429da359e0502c61b3bf8e 100644
--- a/examples/blinky-bl616/Cargo.toml
+++ b/examples/blinky-bl616/Cargo.toml
@@ -8,7 +8,7 @@ publish = false
 
 [dependencies]
 bl-rom-rt = { path = "../.." }
-embedded-hal = "1.0.0-alpha.10"
+embedded-hal = "1.0.0-rc.1"
 panic-halt = "0.2.0"
 
 [features]
diff --git a/examples/blinky-bl616/src/main.rs b/examples/blinky-bl616/src/main.rs
index b34a6efa42f7ce9c8e89cd3ea88c569a93e22537..11e6b6649dbc6db08b47bfd4bf2fcec5fe7c917d 100644
--- a/examples/blinky-bl616/src/main.rs
+++ b/examples/blinky-bl616/src/main.rs
@@ -5,13 +5,13 @@
 #![no_std]
 #![no_main]
 
-use bl_rom_rt::{entry, Peripherals};
+use bl_rom_rt::{entry, Clocks, Peripherals};
 use core::arch::asm;
 use embedded_hal::digital::OutputPin;
 use panic_halt as _;
 
 #[entry]
-fn main(p: Peripherals) -> ! {
+fn main(p: Peripherals, _c: Clocks) -> ! {
     p.gpio.io10.into_jtag_m0();
     p.gpio.io11.into_jtag_m0();
     p.gpio.io12.into_jtag_m0();
diff --git a/examples/blinky-bl808/Cargo.toml b/examples/blinky-bl808/Cargo.toml
index e03390be7526d70a2b49e7236184c7d9aea73598..7dfd8cda247580e7bff86339251389a78412543b 100644
--- a/examples/blinky-bl808/Cargo.toml
+++ b/examples/blinky-bl808/Cargo.toml
@@ -8,7 +8,7 @@ publish = false
 
 [dependencies]
 bl-rom-rt = { path = "../.." }
-embedded-hal = "1.0.0-alpha.10"
+embedded-hal = "1.0.0-rc.1"
 panic-halt = "0.2.0"
 
 [features]
diff --git a/examples/blinky-bl808/src/main.rs b/examples/blinky-bl808/src/main.rs
index 99b116c3b0eac303b13e7a9ddf277d556c2e0284..3acac520118250387866981bf015e8cf53dd4a01 100644
--- a/examples/blinky-bl808/src/main.rs
+++ b/examples/blinky-bl808/src/main.rs
@@ -9,12 +9,12 @@
 #![no_std]
 #![no_main]
 
-use bl_rom_rt::{entry, Peripherals};
+use bl_rom_rt::{entry, Clocks, Peripherals};
 use embedded_hal::digital::OutputPin;
 use panic_halt as _;
 
 #[entry]
-fn main(p: Peripherals) -> ! {
+fn main(p: Peripherals, _c: Clocks) -> ! {
     let mut led = p.gpio.io8.into_floating_output();
     loop {
         led.set_low().ok();
diff --git a/macros/Cargo.toml b/macros/Cargo.toml
index 009bc16985c30c38d0aea63768707c5a31c21e66..1a761fa50803bd2eb93a917afd65096d99729934 100644
--- a/macros/Cargo.toml
+++ b/macros/Cargo.toml
@@ -19,3 +19,8 @@ features = ["extra-traits", "full"]
 [features]
 default = []
 rom-peripherals = []
+bl616 = []
+bl808-m0 = []
+bl808-d0 = []
+bl808-lp = []
+bl702 = []
diff --git a/macros/src/lib.rs b/macros/src/lib.rs
index 279d944422b56e73007145a1fd77d0b51991f356..c843aa54d2146755e4397a8760cd7fd1aba6dab5 100644
--- a/macros/src/lib.rs
+++ b/macros/src/lib.rs
@@ -26,10 +26,10 @@ pub fn entry(args: TokenStream, input: TokenStream) -> TokenStream {
     }
 
     #[cfg(feature = "rom-peripherals")]
-    if f.sig.inputs.len() > 1 {
+    if f.sig.inputs.len() != 2 {
         return parse::Error::new(
             f.sig.inputs.span(),
-            "`#[entry]` function with rom peripherlas should include zero or one parameter",
+            "`#[entry]` function with rom peripherlas should include exactly two parameters",
         )
         .to_compile_error()
         .into();
@@ -55,7 +55,7 @@ pub fn entry(args: TokenStream, input: TokenStream) -> TokenStream {
         #[cfg(feature = "rom-peripherals")]
         return parse::Error::new(
             f.sig.span(),
-            "`#[entry]` function must have signature `[unsafe] fn([p: Peripherals]) -> !`",
+            "`#[entry]` function must have signature `[unsafe] fn(p: Peripherals, c: Clocks) -> !`",
         )
         .to_compile_error()
         .into();
@@ -73,16 +73,22 @@ pub fn entry(args: TokenStream, input: TokenStream) -> TokenStream {
             #[allow(non_snake_case)]
             #[export_name = "main"]
             #(#attrs)*
-            pub #unsafety fn __bl_rom_rt__main() -> ! {
+            pub #unsafety fn main() -> ! {
                 #(#stmts)*
             }
         ),
         #[cfg(feature = "rom-peripherals")]
         () => quote!(
-            #[allow(non_snake_case)]
             #[export_name = "main"]
+            pub extern "C" fn main() -> ! {
+                let p = unsafe { core::mem::transmute(()) };
+                let c = bl_rom_rt::__new_clocks(40_000_000);
+                unsafe { __bl_rom_rt_macros__main(p, c) }
+            }
+            #[allow(non_snake_case)]
+            #[inline(always)]
             #(#attrs)*
-            pub #unsafety fn __bl_rom_rt__main(#inputs) -> ! {
+            #unsafety fn __bl_rom_rt_macros__main(#inputs) -> ! {
                 #(#stmts)*
             }
         ),
diff --git a/src/lib.rs b/src/lib.rs
index d5fadfc6afbfcefdb5511ad7285f00950bdf5d81..ba5f07e18fdbf563472c752e99eab4c4b81c8d2c 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -9,11 +9,11 @@ pub mod soc;
 #[cfg(feature = "rom-peripherals")]
 cfg_if::cfg_if! {
     if #[cfg(feature = "bl616")] {
-        pub use soc::bl616::Peripherals;
+        pub use soc::bl616::{Peripherals, Clocks, __new_clocks};
     } else if #[cfg(feature = "bl702")] {
-        pub use soc::bl702::Peripherals;
+        pub use soc::bl702::{Peripherals, Clocks, __new_clocks};
     } else if #[cfg(any(feature = "bl808-m0", feature = "bl808-d0"))] {
-        pub use soc::bl808::Peripherals;
+        pub use soc::bl808::{Peripherals, Clocks, __new_clocks};
     }
 }
 
diff --git a/src/soc/bl616.rs b/src/soc/bl616.rs
index 4188b74caec540988a17d00243650b514d2295cf..3110113f99b175c2170769d86674b4a84b0bb5bb 100644
--- a/src/soc/bl616.rs
+++ b/src/soc/bl616.rs
@@ -6,10 +6,7 @@ use crate::{HalBasicConfig, HalFlashConfig, HalPatchCfg};
 use base_address::Static;
 
 #[cfg(feature = "bl616")]
-use crate::Stack;
-
-#[cfg(feature = "bl616")]
-use core::arch::asm;
+use {crate::Stack, core::arch::asm};
 
 #[cfg(feature = "bl616")]
 const LEN_STACK: usize = 1 * 1024;
@@ -51,7 +48,6 @@ unsafe extern "C" fn start() -> ! {
 }
 
 #[cfg(feature = "bl616")]
-#[rustfmt::skip]
 extern "Rust" {
     // This symbol is generated by `#[entry]` macro
     fn main() -> !;
@@ -246,6 +242,20 @@ pub struct Peripherals {
     pub hbn: bl_soc::HBN<Static<0x2000F000>>,
 }
 
+#[cfg(feature = "rom-peripherals")]
+pub use bl_soc::clocks::Clocks;
+
+// Used by macros only.
+#[cfg(feature = "rom-peripherals")]
+#[doc(hidden)]
+#[inline(always)]
+pub fn __new_clocks(xtal_hz: u32) -> Clocks {
+    use embedded_time::rate::Hertz;
+    Clocks {
+        xtal: Hertz(xtal_hz),
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::{HalBootheader, HalPllConfig, HalSysClkConfig};
diff --git a/src/soc/bl702.rs b/src/soc/bl702.rs
index d64bf1e90e576bf145eb70110f7303a4c32443ba..f4e21c36fc8b160920166b3178d0573abfa5b12d 100644
--- a/src/soc/bl702.rs
+++ b/src/soc/bl702.rs
@@ -174,6 +174,21 @@ pub struct Peripherals {
     // TODO: BL702 peripherals.
 }
 
+#[cfg(feature = "rom-peripherals")]
+pub use bl_soc::clocks::Clocks;
+
+// TODO: BL702 clock tree configuration.
+// Used by macros only.
+#[cfg(feature = "rom-peripherals")]
+#[doc(hidden)]
+#[inline(always)]
+pub fn __new_clocks(xtal_hz: u32) -> Clocks {
+    use embedded_time::rate::Hertz;
+    Clocks {
+        xtal: Hertz(xtal_hz),
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::{HalBasicConfig, HalBootheader, HalPllConfig, HalSysClkConfig};
diff --git a/src/soc/bl808.rs b/src/soc/bl808.rs
index e90dc5aff05e53092a3a46eb8effd1352b09cefd..473112b488546b97ff4a0003072225cdda1c0ba1 100644
--- a/src/soc/bl808.rs
+++ b/src/soc/bl808.rs
@@ -3,10 +3,7 @@
 use crate::{HalBasicConfig, HalFlashConfig, HalPatchCfg};
 
 #[cfg(any(feature = "bl808-m0", feature = "bl808-d0"))]
-use core::arch::asm;
-
-#[cfg(any(feature = "bl808-m0", feature = "bl808-d0"))]
-use crate::Stack;
+use {crate::Stack, core::arch::asm};
 
 #[cfg(feature = "rom-peripherals")]
 use base_address::Static;
@@ -90,7 +87,6 @@ unsafe extern "C" fn start() -> ! {
 }
 
 #[cfg(any(feature = "bl808-m0", feature = "bl808-d0"))]
-#[rustfmt::skip]
 extern "Rust" {
     // This symbol is generated by `#[entry]` macro
     fn main() -> !;
@@ -385,6 +381,20 @@ pub struct Peripherals {
     pub i2c3: bl_soc::I2C<Static<0x30004000>>,
 }
 
+#[cfg(feature = "rom-peripherals")]
+pub use bl_soc::clocks::Clocks;
+
+// Used by macros only.
+#[cfg(feature = "rom-peripherals")]
+#[doc(hidden)]
+#[inline(always)]
+pub fn __new_clocks(xtal_hz: u32) -> Clocks {
+    use embedded_time::rate::Hertz;
+    Clocks {
+        xtal: Hertz(xtal_hz),
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::{HalBootheader, HalCpuCfg, HalPllConfig, HalSysClkConfig};