From d24370dd03207e94f23f8d42068b7c2c04000113 Mon Sep 17 00:00:00 2001
From: cscherr <Christoph.Scherr@newtec.de>
Date: Wed, 14 May 2025 17:26:38 +0200
Subject: [PATCH] fix!: don't require defmt always

---
 .cargo/config.toml |  2 --
 Cargo.toml         | 29 ++++++++++++++++++++++++++---
 build.rs           |  8 ++++++++
 3 files changed, 34 insertions(+), 5 deletions(-)
 create mode 100755 build.rs

diff --git a/.cargo/config.toml b/.cargo/config.toml
index a210e52..2aafa28 100755
--- a/.cargo/config.toml
+++ b/.cargo/config.toml
@@ -4,8 +4,6 @@ target = "thumbv6m-none-eabi"
 [target.thumbv6m-none-eabi]
 runner = 'probe-rs run --chip STM32L053R8'
 
-rustflags = ["-C", "link-arg=-Tlink.x", "-C", "link-arg=-Tdefmt.x"]
-
 
 [alias]
 cflash = "flash --chip STM32L053R8"
diff --git a/Cargo.toml b/Cargo.toml
index 38a3552..2e46d0c 100755
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,6 +14,29 @@ cortex-m-rt = "0.7.5"
 panic-halt = "1.0.0"
 hd44780-driver = "0.4.0"
 heapless = "0.8.0"
-defmt = "1.0.1"
-defmt-rtt = "1.0.0"
-panic-probe = { version = "0.3", features = ["print-defmt"] }
+defmt = {version="1.0.1", optional= true}
+defmt-rtt = {version="1.0.0", optional=true}
+panic-probe = { version = "0.3", features = ["print-defmt"], optional=true }
+
+[features]
+logging = ["dep:defmt", "dep:defmt-rtt", "dep:panic-probe"]
+
+[[example]]
+name = "logging"
+path = "examples/logging.rs"
+required-features = ["logging"]
+
+[[example]]
+name = "rtc-log"
+path = "examples/rtc-log.rs"
+required-features = ["logging"]
+
+[[example]]
+name = "temperature"
+path = "examples/temperature.rs"
+required-features = ["logging"]
+
+[[example]]
+name = "aes_ecb"
+path = "examples/aes_ecb.rs"
+required-features = ["logging"]
diff --git a/build.rs b/build.rs
new file mode 100755
index 0000000..6aec154
--- /dev/null
+++ b/build.rs
@@ -0,0 +1,8 @@
+fn main() {
+    println!("cargo::rerun-if-changed=Cargo.toml");
+    println!("cargo::rustc-link-arg=-Tlink.x");
+    #[cfg(feature = "logging")]
+    {
+        println!("cargo::rustc-link-arg=-Tdefmt.x");
+    }
+}