Merge pull request #3870 from kkrolczyk/kk/mostly-docu-changes-and-examples-fix

dfu documentation update, fix a couple issues

1 files changed, 1 insertions, 1 deletions

diff --git a/docs/examples/layer-by-layer/blinky-async/Cargo.toml b/docs/examples/layer-by-layer/blinky-async/Cargo.toml
index 51ddf87d4..541eb6edf 100644
--- a/docs/examples/layer-by-layer/blinky-async/Cargo.toml
+++ b/docs/examples/layer-by-layer/blinky-async/Cargo.toml
@@ -5,7 +5,7 @@ edition = "2021"
 license = "MIT OR Apache-2.0"
 
 [dependencies]
-cortex-m = "0.7"
+cortex-m = { version = "0.7", features = ["critical-section-single-core"] }
 cortex-m-rt = "0.7"
 embassy-stm32 = { version = "0.2.0", path = "../../../../embassy-stm32", features = ["stm32l475vg", "memory-x", "exti"]  }
 embassy-executor = { version = "0.7.0", path = "../../../../embassy-executor", features = ["arch-cortex-m", "executor-thread"] }