diff --git a/.github/workflows/build-examples.yml b/.github/workflows/build-examples.yml
index d3837ff..06bcd2d 100644
--- a/.github/workflows/build-examples.yml
+++ b/.github/workflows/build-examples.yml
@@ -23,8 +23,7 @@ jobs:
           rustup default nightly
           rustup component add rust-src
           rustup update
-          rustup target add riscv32imac-unknown-none-elf
-          rustup target add riscv32imafc-unknown-none-elf
+          rustup target add riscv32imc-unknown-none-elf
           rustup target add riscv32i-unknown-none-elf
       - name: Fetch Deps
         # if this is a pull request
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 3752113..51d8202 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -30,23 +30,27 @@ jobs:
           - ch641
         include:
           - chip: ch32l103f8u6
-            target: riscv32imac-unknown-none-elf
+            target: riscv32imc-unknown-none-elf
           - chip: ch32v003f4u6
             target: riscv32i-unknown-none-elf
           - chip: ch32v103c8t6
-            target: riscv32imac-unknown-none-elf
+            target: riscv32imc-unknown-none-elf
           - chip: ch32v203f8u6
-            target: riscv32imac-unknown-none-elf
+            target: riscv32imc-unknown-none-elf
           - chip: ch32v208wbu6
-            target: riscv32imac-unknown-none-elf
+            target: riscv32imc-unknown-none-elf
           - chip: ch32v303vct6
-            target: riscv32imafc-unknown-none-elf
+            # use rv32imc because ri32imfc does not exist, hal should not use FP anyways
+            target: riscv32imc-unknown-none-elf
           - chip: ch32v305fbp6
-            target: riscv32imafc-unknown-none-elf
+            # use rv32imc because ri32imfc does not exist
+            target: riscv32imc-unknown-none-elf
           - chip: ch32v307vct6
-            target: riscv32imafc-unknown-none-elf
+            # use rv32imc because ri32imfc does not exist
+            target: riscv32imc-unknown-none-elf
           - chip: ch32x035f7p6
-            target: riscv32imafc-unknown-none-elf
+            # use rv32imc because ri32imfc does not exist
+            target: riscv32imc-unknown-none-elf
           - chip: ch641
             target: riscv32i-unknown-none-elf
     runs-on: ubuntu-latest
@@ -57,8 +61,7 @@ jobs:
           rustup default nightly
           rustup component add rust-src
           rustup update
-          rustup target add riscv32imac-unknown-none-elf
-          rustup target add riscv32imafc-unknown-none-elf
+          rustup target add riscv32imc-unknown-none-elf
           rustup target add riscv32i-unknown-none-elf
       - name: Fetch Deps
         # if this is a pull request
diff --git a/Cargo.toml b/Cargo.toml
index 08924fd..3eec365 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -17,8 +17,8 @@ ch32-metapac = { features = [
     "rt",
 ], git = "https://github.com/ch32-rs/ch32-metapac", rev = "cef1944dadf3a5d198e687500b8f5964f29efdf6" }
 
-qingke = { version = "0.4.0", features = ["critical-section-impl"] }
-qingke-rt = { version = "0.4.0", optional = true }
+qingke = { version = "0.5.0", features = ["critical-section-impl"] }
+qingke-rt = { version = "0.5.0", optional = true }
 
 # TODO: remove this
 embedded-hal-02 = { package = "embedded-hal", version = "0.2.6", features = [
diff --git a/examples/ch32l103/.cargo/config.toml b/examples/ch32l103/.cargo/config.toml
index d12976a..f48b516 100644
--- a/examples/ch32l103/.cargo/config.toml
+++ b/examples/ch32l103/.cargo/config.toml
@@ -1,6 +1,6 @@
 [build]
-target = "riscv32imac-unknown-none-elf"
+target = "riscv32imc-unknown-none-elf"
 
-[target."riscv32imac-unknown-none-elf"]
+[target."riscv32imc-unknown-none-elf"]
 runner = "wlink -v flash --enable-sdi-print --watch-serial"
 # runner = "wlink -v flash"
diff --git a/examples/ch32l103/Cargo.toml b/examples/ch32l103/Cargo.toml
index 544b700..7611f4c 100644
--- a/examples/ch32l103/Cargo.toml
+++ b/examples/ch32l103/Cargo.toml
@@ -18,15 +18,17 @@ embassy-executor = { version = "0.6.0", features = [
 ] }
 embassy-time = { version = "0.3.2" }
 
-qingke-rt = { version = "0.4.0" }
-qingke = "0.4.0"
-# qingke-rt = { version = "0.4.0", path = "../../../qingke/qingke-rt" }
-# qingke = { version = "0.4.0", path = "../../../qingke" }
+# This is okay because we should automatically use whatever ch32-hal uses
+qingke = "*"
+qingke-rt = "*"
 
-panic-halt = "0.2.0"
+panic-halt = "1.0"
 embedded-hal = "1.0.0"
 
 [profile.release]
 strip = false   # symbols are not flashed to the microcontroller, so don't strip them.
 lto = true
 opt-level = "z" # Optimize for size.
+
+[profile.dev]
+opt-level = 1 # At least some opt so binary is not insane
\ No newline at end of file
diff --git a/examples/ch32v003/Cargo.toml b/examples/ch32v003/Cargo.toml
index 30923bf..9a04b7e 100644
--- a/examples/ch32v003/Cargo.toml
+++ b/examples/ch32v003/Cargo.toml
@@ -13,19 +13,18 @@ ch32-hal = { path = "../../", features = [
 ] }
 embassy-executor = { version = "0.6.0", features = [
     "integrated-timers",
-    "arch-riscv32",
+    "arch-spin",
     "executor-thread",
     "task-arena-size-128", # or better use nightly, but fails on recent Rust versions
 ] }
 embassy-time = { version = "0.3.0" }
 
-qingke-rt = { version = "0.4.0", features = ["highcode"] }
-qingke = "0.4.0"
-# qingke-rt = { version = "0.4.0", path = "../../../qingke/qingke-rt" }
-# qingke = { version = "0.4.0", path = "../../../qingke" }
+# This is okay because we should automatically use whatever ch32-hal uses
+qingke = "*"
+qingke-rt = { version = "*", features = ["highcode"] }
 
 
-panic-halt = "0.2.0"
+panic-halt = "1.0"
 
 embedded-hal = "1.0.0"
 
diff --git a/examples/ch32v103/.cargo/config.toml b/examples/ch32v103/.cargo/config.toml
index f6a0f6b..a0f217a 100644
--- a/examples/ch32v103/.cargo/config.toml
+++ b/examples/ch32v103/.cargo/config.toml
@@ -1,7 +1,7 @@
 [build]
-target = "riscv32imac-unknown-none-elf"
+target = "riscv32imc-unknown-none-elf"
 
-[target."riscv32imac-unknown-none-elf"]
+[target."riscv32imc-unknown-none-elf"]
 rustflags = [
 #  "-C", "link-arg=-Tlink.x",
 ]
diff --git a/examples/ch32v103/Cargo.toml b/examples/ch32v103/Cargo.toml
index 9034bf0..98ced46 100644
--- a/examples/ch32v103/Cargo.toml
+++ b/examples/ch32v103/Cargo.toml
@@ -12,21 +12,20 @@ ch32-hal = { path = "../../", features = [
 ] }
 embassy-executor = { version = "0.6.0", features = [
     "integrated-timers",
-    "arch-riscv32",
+    "arch-spin",
     "executor-thread",
 ] }
 embassy-time = { version = "0.3.2" }
 
-qingke-rt = "0.4.0"
-qingke = "0.4.0"
-# qingke-rt = { version = "0.4.0", path = "../../../qingke/qingke-rt" }
-# qingke = { version = "0.4.0", path = "../../../qingke" }
+# This is okay because we should automatically use whatever ch32-hal uses
+qingke-rt = "*"
+qingke = "*"
 
 # Not working for now
 # defmt = "0.3"
 # defmt-rtt = "0.4"
 
-panic-halt = "0.2.0"
+panic-halt = "1.0"
 
 display-interface-spi = "0.5.0"
 mipidsi = "0.7.1"
diff --git a/examples/ch32v203/.cargo/config.toml b/examples/ch32v203/.cargo/config.toml
index e146c9f..c0b2201 100644
--- a/examples/ch32v203/.cargo/config.toml
+++ b/examples/ch32v203/.cargo/config.toml
@@ -1,7 +1,7 @@
 [build]
-target = "riscv32imac-unknown-none-elf"
+target = "riscv32imc-unknown-none-elf"
 
-[target."riscv32imac-unknown-none-elf"]
+[target."riscv32imc-unknown-none-elf"]
 rustflags = [
 #  "-C", "link-arg=-Tlink.x",
 ]
diff --git a/examples/ch32v203/Cargo.toml b/examples/ch32v203/Cargo.toml
index 3b82733..e79a39b 100644
--- a/examples/ch32v203/Cargo.toml
+++ b/examples/ch32v203/Cargo.toml
@@ -11,25 +11,22 @@ ch32-hal = { path = "../../", features = [
     "rt",
     "time-driver-tim2",
 ], default-features = false }
-#ch32-metapac = { features = [
-#    "memory-x",
-#    "rt",
-#], path = "../../../ch32-data/build/ch32-metapac" }
+
 embassy-executor = { version = "0.6.0", features = [
     "integrated-timers",
     "arch-riscv32",
     "executor-thread",
 ] }
+
 embassy-time = { version = "0.3.2" }
 embassy-usb = { version = "0.3.0" }
 embassy-futures = { version = "0.1.0" }
 
-qingke-rt = "0.4.0"
-qingke = "0.4.0"
-#qingke-rt = { version = "0.4.0", path = "../../../qingke/qingke-rt" }
-# qingke = { version = "0.4.0", path = "../../../qingke" }
+# This is okay because we should automatically use whatever ch32-hal uses
+qingke-rt = "*"
+qingke = "*"
 
-panic-halt = "0.2.0"
+panic-halt = "1.0"
 
 display-interface-spi = "0.5.0"
 embedded-hal = "1.0.0"
diff --git a/examples/ch32v208/.cargo/config.toml b/examples/ch32v208/.cargo/config.toml
index d12976a..f48b516 100644
--- a/examples/ch32v208/.cargo/config.toml
+++ b/examples/ch32v208/.cargo/config.toml
@@ -1,6 +1,6 @@
 [build]
-target = "riscv32imac-unknown-none-elf"
+target = "riscv32imc-unknown-none-elf"
 
-[target."riscv32imac-unknown-none-elf"]
+[target."riscv32imc-unknown-none-elf"]
 runner = "wlink -v flash --enable-sdi-print --watch-serial"
 # runner = "wlink -v flash"
diff --git a/examples/ch32v208/Cargo.toml b/examples/ch32v208/Cargo.toml
index 8ffcb92..558944b 100644
--- a/examples/ch32v208/Cargo.toml
+++ b/examples/ch32v208/Cargo.toml
@@ -17,12 +17,11 @@ embassy-executor = { version = "0.6.0", features = [
 ] }
 embassy-time = { version = "0.3.2" }
 
-qingke-rt = "0.4.0"
-qingke = "0.4.0"
-# qingke-rt = { version = "0.4.0", path = "../../../qingke/qingke-rt" }
-# qingke = { version = "0.4.0", path = "../../../qingke" }
+# This is okay because we should automatically use whatever ch32-hal uses
+qingke-rt = "*"
+qingke = "*"
 
-panic-halt = "0.2.0"
+panic-halt = "1.0"
 
 [profile.release]
 strip = false   # symbols are not flashed to the microcontroller, so don't strip them.
diff --git a/examples/ch32v305/.cargo/config.toml b/examples/ch32v305/.cargo/config.toml
index 98c600b..78ace26 100644
--- a/examples/ch32v305/.cargo/config.toml
+++ b/examples/ch32v305/.cargo/config.toml
@@ -1,7 +1,10 @@
 [build]
-target = "riscv32imafc-unknown-none-elf"
+target = "riscv32imfc-unknown-none-elf.json"
 
-[target.riscv32imafc-unknown-none-elf]
+[unstable]
+build-std = ["core"]
+
+[target.riscv32imfc-unknown-none-elf]
 # runner = "wlink flash --enable-sdi-print --watch-serial"
 runner = "wlink flash"
 
diff --git a/examples/ch32v305/Cargo.toml b/examples/ch32v305/Cargo.toml
index 5fd308b..947a7a2 100644
--- a/examples/ch32v305/Cargo.toml
+++ b/examples/ch32v305/Cargo.toml
@@ -17,28 +17,28 @@ embassy-executor = { version = "0.6.0", features = [
 ] }
 embassy-time = { version = "0.3.2" }
 
-qingke-rt = "0.4.0"
-qingke = "0.4.0"
-# qingke-rt = { version = "0.4.0", path = "../../../qingke/qingke-rt" }
-# qingke = { version = "0.4.0", path = "../../../qingke" }
+qingke-rt = "*"
+qingke = "*"
 
-# Not working for now
-# defmt = "0.3"
-# defmt-rtt = "0.4"
+panic-halt = "1.0"
 
-panic-halt = "0.2.0"
+portable-atomic = { version = "1", default-features = false, features = [
+    "critical-section",
+] }
 
 display-interface-spi = "0.5.0"
-mipidsi = "0.7.1"
 embedded-graphics = "0.8.1"
 embedded-hal-bus = "0.1.0"
 embedded-hal = "1.0.0"
 micromath = "2.1.0"
 nb = "1.1.0"
-heapless = "0.8.0"
+heapless = { version = "0.8.0", features = ["portable-atomic"] }
 
 
 [profile.release]
 strip = false   # symbols are not flashed to the microcontroller, so don't strip them.
 lto = true
 opt-level = "z" # Optimize for size.
+
+[profile.dev]
+opt-level = 2 # At least some opt so binary size is not insane
diff --git a/examples/ch32v305/riscv32imfc-unknown-none-elf.json b/examples/ch32v305/riscv32imfc-unknown-none-elf.json
new file mode 100644
index 0000000..fa0696e
--- /dev/null
+++ b/examples/ch32v305/riscv32imfc-unknown-none-elf.json
@@ -0,0 +1,19 @@
+{
+  "arch": "riscv32",
+  "atomic-cas": false,
+  "cpu": "generic-rv32",
+  "crt-objects-fallback": "false",
+  "data-layout": "e-m:e-p:32:32-i64:64-n32-S128",
+  "eh-frame-header": false,
+  "emit-debug-gdb-scripts": false,
+  "features": "+m,+f,+c,+forced-atomics",
+  "is-builtin": false,
+  "linker": "rust-lld",
+  "linker-flavor": "gnu-lld",
+  "llvm-abiname": "ilp32f",
+  "llvm-target": "riscv32",
+  "max-atomic-width": 32,
+  "panic-strategy": "abort",
+  "relocation-model": "static",
+  "target-pointer-width": "32"
+}
diff --git a/examples/ch32v307/.cargo/config.toml b/examples/ch32v307/.cargo/config.toml
index ef5f041..ebd8c04 100644
--- a/examples/ch32v307/.cargo/config.toml
+++ b/examples/ch32v307/.cargo/config.toml
@@ -1,7 +1,10 @@
 [build]
-target = "riscv32imafc-unknown-none-elf"
+target = "riscv32imfc-unknown-none-elf.json"
 
-[target.riscv32imafc-unknown-none-elf]
+[unstable]
+build-std = ["core"]
+
+[target.riscv32imfc-unknown-none-elf]
 runner = "wlink flash --enable-sdi-print --watch-serial"
 # runner = "wlink -v flash --no-erase --dry-run"
 # runner = "probe-rs run --chip CH32V307"
diff --git a/examples/ch32v307/Cargo.toml b/examples/ch32v307/Cargo.toml
index c470ec1..35696b1 100644
--- a/examples/ch32v307/Cargo.toml
+++ b/examples/ch32v307/Cargo.toml
@@ -24,19 +24,14 @@ embassy-time = "0.3.2"
 embassy-usb = "0.3.0"
 nb = "1.1.0"
 
-qingke = "0.4.0"
-qingke-rt = "0.4.0"
+# This is okay because we should automatically use whatever ch32-hal uses
+qingke = "*"
+qingke-rt = "*"
 
-# Not working for now
-# defmt = "0.3"
-# defmt-rtt = "0.4"
-
-panic-halt = "0.2.0"
+panic-halt = "1.0"
 
 display-interface-spi = "0.5.0"
-mipidsi = "0.7.1"
 embedded-graphics = "0.8.1"
-embedded-hal-bus = "0.2.0"
 # for ssd1306
 ssd1306 = "0.9"
 
diff --git a/examples/ch32v307/riscv32imfc-unknown-none-elf.json b/examples/ch32v307/riscv32imfc-unknown-none-elf.json
new file mode 100644
index 0000000..fa0696e
--- /dev/null
+++ b/examples/ch32v307/riscv32imfc-unknown-none-elf.json
@@ -0,0 +1,19 @@
+{
+  "arch": "riscv32",
+  "atomic-cas": false,
+  "cpu": "generic-rv32",
+  "crt-objects-fallback": "false",
+  "data-layout": "e-m:e-p:32:32-i64:64-n32-S128",
+  "eh-frame-header": false,
+  "emit-debug-gdb-scripts": false,
+  "features": "+m,+f,+c,+forced-atomics",
+  "is-builtin": false,
+  "linker": "rust-lld",
+  "linker-flavor": "gnu-lld",
+  "llvm-abiname": "ilp32f",
+  "llvm-target": "riscv32",
+  "max-atomic-width": 32,
+  "panic-strategy": "abort",
+  "relocation-model": "static",
+  "target-pointer-width": "32"
+}
diff --git a/examples/ch32x035/.cargo/config.toml b/examples/ch32x035/.cargo/config.toml
index ec49323..47a11e5 100644
--- a/examples/ch32x035/.cargo/config.toml
+++ b/examples/ch32x035/.cargo/config.toml
@@ -1,7 +1,7 @@
 [build]
-target = "riscv32imac-unknown-none-elf"
+target = "riscv32imc-unknown-none-elf"
 
-[target.riscv32imac-unknown-none-elf]
+[target.riscv32imc-unknown-none-elf]
 runner = "wlink flash --enable-sdi-print --watch-serial"
 # runner = "wlink -v flash --no-erase --dry-run"
 # runner = "probe-rs run --chip CH32V307"
diff --git a/examples/ch32x035/Cargo.toml b/examples/ch32x035/Cargo.toml
index cf22bb3..aee4630 100644
--- a/examples/ch32x035/Cargo.toml
+++ b/examples/ch32x035/Cargo.toml
@@ -17,17 +17,14 @@ embassy-executor = { version = "0.6.0", features = [
 ] }
 embassy-time = { version = "0.3.2" }
 
-qingke-rt = "0.4.0"
-qingke = "0.4.0"
-# qingke-rt = { version = "0.4.0", path = "../../../qingke/qingke-rt" }
-# qingke = { version = "0.4.0", path = "../../../qingke" }
+qingke-rt = "*"
+qingke = "*"
 
-panic-halt = "0.2.0"
+panic-halt = "1.0"
 
 display-interface-spi = "0.5.0"
 mipidsi = "0.7.1"
 embedded-graphics = "0.8.1"
-embedded-hal-bus = "0.2.0"
 embedded-hal = "1.0.0"
 heapless = "0.8.0"
 
diff --git a/examples/ch641/Cargo.toml b/examples/ch641/Cargo.toml
index 0fc8cd7..8e18b30 100644
--- a/examples/ch641/Cargo.toml
+++ b/examples/ch641/Cargo.toml
@@ -18,17 +18,12 @@ embassy-executor = { version = "0.6.0", features = [
     "task-arena-size-128", # or better use nightly, but fails on recent Rust versions
 ] }
 embassy-time = { version = "0.3.2" }
-
-qingke-rt = "0.4.0"
-qingke = "0.4.0"
-# qingke-rt = { version = "0.4.0", path = "../../../qingke/qingke-rt" }
-# qingke = { version = "0.4.0", path = "../../../qingke" }
-
-
-panic-halt = "0.2.0"
-
 embedded-hal = "1.0.0"
 
+qingke-rt = "*"
+qingke = "*"
+
+panic-halt = "1.0"
 
 [profile.release]
 strip = false   # symbols are not flashed to the microcontroller, so don't strip them.
diff --git a/src/dma/dma_bdma.rs b/src/dma/dma_bdma.rs
index 2ec7aaf..b27c595 100644
--- a/src/dma/dma_bdma.rs
+++ b/src/dma/dma_bdma.rs
@@ -1,8 +1,10 @@
+use core::cell::Cell;
 use core::future::{poll_fn, Future};
 use core::pin::Pin;
 use core::sync::atomic::{compiler_fence, fence, AtomicUsize, Ordering};
 use core::task::{Context, Poll, Waker};
 
+use embassy_sync::blocking_mutex::CriticalSectionMutex;
 use embassy_sync::waitqueue::AtomicWaker;
 
 use super::ringbuffer::{DmaCtrl, OverrunError, ReadableDmaRingBuffer, WritableDmaRingBuffer};
@@ -144,13 +146,12 @@ impl AnyChannel {
                 } else if isr.tcif(info.num) && cr.read().tcie() {
                     // Acknowledge transfer complete interrupt
                     r.ifcr().write(|w| w.set_tcif(info.num, true));
-                    #[cfg(not(qingke_v2))]
-                    state.complete_count.fetch_add(1, Ordering::Release);
-                    #[cfg(qingke_v2)]
                     critical_section::with(|_| {
-                        let x = state.complete_count.load(Ordering::Relaxed);
-                        state.complete_count.store(x + 1, Ordering::Release);
-                    })
+                        // #safty this is okay because critical section ensures
+                        // no interruption
+                        let cnt = state.complete_count.load(Ordering::Acquire);
+                        state.complete_count.store(cnt + 1, Ordering::Release);
+                    });
                 } else {
                     return;
                 }
@@ -476,14 +477,11 @@ impl<'a> DmaCtrl for DmaCtrlImpl<'a> {
 
     fn reset_complete_count(&mut self) -> usize {
         let state = &STATE[self.0.id as usize];
-        #[cfg(not(qingke_v2))]
-        return state.complete_count.swap(0, Ordering::AcqRel);
-        #[cfg(qingke_v2)]
-        return critical_section::with(|_| {
-            let x = state.complete_count.load(Ordering::Acquire);
+        critical_section::with(|_| {
+            let old_val = state.complete_count.load(Ordering::Acquire);
             state.complete_count.store(0, Ordering::Release);
-            x
-        });
+            old_val
+        })
     }
 
     fn set_waker(&mut self, waker: &Waker) {
diff --git a/src/embassy/time_driver_systick.rs b/src/embassy/time_driver_systick.rs
index f28d076..9028ebc 100644
--- a/src/embassy/time_driver_systick.rs
+++ b/src/embassy/time_driver_systick.rs
@@ -1,6 +1,5 @@
 //! SysTick-based time driver.
 
-use core::arch::asm;
 use core::cell::Cell;
 use core::sync::atomic::{AtomicU32, AtomicU8, Ordering};
 use core::{mem, ptr};
@@ -9,11 +8,9 @@ use critical_section::{CriticalSection, Mutex};
 use embassy_time_driver::{AlarmHandle, Driver};
 use pac::systick::vals;
 use qingke::interrupt::Priority;
-#[cfg(feature = "highcode")]
-use qingke_rt::highcode;
 use qingke_rt::interrupt;
 
-use crate::{pac, println};
+use crate::pac;
 
 pub const ALARM_COUNT: usize = 1;
 
@@ -130,20 +127,21 @@ impl Driver for SystickDriver {
         let period = self.period.load(Ordering::Relaxed) as u64;
         rb.cnt().read() / period
     }
+
     unsafe fn allocate_alarm(&self) -> Option<AlarmHandle> {
-        let id = self.alarm_count.fetch_update(Ordering::AcqRel, Ordering::Acquire, |x| {
+        let id = critical_section::with(|_| {
+            let x = self.alarm_count.load(Ordering::Acquire);
             if x < ALARM_COUNT as u8 {
-                Some(x + 1)
+                self.alarm_count.store(x + 1, Ordering::Release);
+                Some(x)
             } else {
                 None
             }
         });
 
-        match id {
-            Ok(id) => Some(AlarmHandle::new(id)),
-            Err(_) => None,
-        }
+        id.map(|id| AlarmHandle::new(id))
     }
+
     fn set_alarm_callback(&self, alarm: AlarmHandle, callback: fn(*mut ()), ctx: *mut ()) {
         critical_section::with(|cs| {
             let alarm = self.get_alarm(cs, alarm);
@@ -152,6 +150,7 @@ impl Driver for SystickDriver {
             alarm.ctx.set(ctx);
         })
     }
+
     fn set_alarm(&self, alarm: AlarmHandle, timestamp: u64) -> bool {
         critical_section::with(|cs| {
             let rb = &crate::pac::SYSTICK;