working rtic on TM4C123GXL

flake.nix

@@ -1,5 +1,5 @@
 {
-  description = "EK-TM4C123GXL (Tiva C) board RTIC dev flake using probe-rs";
+  description = "EK-TM4C123GXL (Tiva C) board RTIC dev flake";
 
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
@@ -27,7 +27,6 @@
             cargo-binutils
             flip-link
             gcc-arm-embedded
-            probe-rs
             openocd
             cargo-generate
           ];
@@ -35,7 +34,6 @@
           shellHook = ''
             echo ">>> EK-TM4C123GXL RTIC DevShell ready."
             rustc --version
-            probe-rs --version
           '';
         };
       });

tm4c-rtic-example/.cargo/config.toml

@@ -0,0 +1,5 @@
+[target.thumbv7em-none-eabihf]
+rustflags = ["-C", "link-arg=-Tlink.x"]
+
+[build]
+target = "thumbv7em-none-eabihf"

tm4c-rtic-example/.gitignore

@@ -0,0 +1 @@
+target/

tm4c-rtic-example/Cargo.lock

@@ -176,6 +176,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6bc68b1fa2eefbb7ad6747b299b79c8fca92163dfa46f0e279f39109cf272186"
 dependencies = [
  "bare-metal 1.0.0",
+ "cortex-m",
  "critical-section",
  "portable-atomic",
  "rtic-core",
@@ -281,6 +282,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fbdca3909d1c9ab4aba7a85b6b606f90b1bf4ae19a14c9bc4772b02017a82aad"
 dependencies = [
  "cortex-m",
+ "cortex-m-rt",
  "vcell",
 ]
 

tm4c-rtic-example/Cargo.toml

@@ -1,11 +1,11 @@
 [package]
 name = "tm4c-rtic-example"
 version = "0.1.0"
-edition = "2021"
+edition = "2024"
 
 [dependencies]
 cortex-m = "0.7.7"
 cortex-m-rt = "0.7.3"
 panic-halt = "0.2.0"
-tm4c123x-hal = "0.10.1"
+tm4c123x-hal = { version = "0.10.1", features = ["rt"] }
-rtic = "2.0.0"
+rtic = { version = "2.0.0", features = ["thumbv7-backend"] }

tm4c-rtic-example/memory.x

@@ -0,0 +1,5 @@
+MEMORY
+{
+  FLASH : ORIGIN = 0x00000000, LENGTH = 256K
+  RAM : ORIGIN = 0x20000000, LENGTH = 32K
+}

tm4c-rtic-example/src/main.rs

@@ -6,12 +6,10 @@
 #![deny(unsafe_code)]
 #![deny(missing_docs)]
 
-use panic_semihosting as _;
+use panic_halt as _;
 
-#[rtic::app(device = lm3s6965, dispatchers = [SSI0])]
+#[rtic::app(device = tm4c123x_hal::tm4c123x, dispatchers = [SSI0])]
 mod app {
-    use cortex_m_semihosting::{debug, hprintln};
-
     #[shared]
     struct Shared {}
 
@@ -20,16 +18,12 @@ mod app {
 
     #[init]
     fn init(_: init::Context) -> (Shared, Local) {
-        hprintln!("init");
-        foo::spawn().unwrap();
 
+        foo::spawn().unwrap();
         (Shared {}, Local {})
     }
 
     #[task]
     async fn foo(_: foo::Context) {
-        hprintln!("foo");
-
-        debug::exit(debug::EXIT_SUCCESS); // Exit QEMU simulator
     }
 }

tm4c-rtic-example/target/.rustc_info.json

@@ -1 +1 @@
-{"rustc_fingerprint":13532102840378780987,"outputs":{"7971740275564407648":{"success":true,"status":"","code":0,"stdout":"___\nlib___.rlib\nlib___.so\nlib___.so\nlib___.a\nlib___.so\n/nix/store/ykm6in4f9h723ca61pwmiyc0mzibrbcz-rust-default-1.92.0-nightly-2025-10-09\noff\npacked\nunpacked\n___\ndebug_assertions\nfmt_debug=\"full\"\noverflow_checks\npanic=\"unwind\"\nproc_macro\nrelocation_model=\"pic\"\ntarget_abi=\"\"\ntarget_arch=\"x86_64\"\ntarget_endian=\"little\"\ntarget_env=\"gnu\"\ntarget_family=\"unix\"\ntarget_feature=\"fxsr\"\ntarget_feature=\"sse\"\ntarget_feature=\"sse2\"\ntarget_feature=\"x87\"\ntarget_has_atomic\ntarget_has_atomic=\"16\"\ntarget_has_atomic=\"32\"\ntarget_has_atomic=\"64\"\ntarget_has_atomic=\"8\"\ntarget_has_atomic=\"ptr\"\ntarget_has_atomic_equal_alignment=\"16\"\ntarget_has_atomic_equal_alignment=\"32\"\ntarget_has_atomic_equal_alignment=\"64\"\ntarget_has_atomic_equal_alignment=\"8\"\ntarget_has_atomic_equal_alignment=\"ptr\"\ntarget_has_atomic_load_store\ntarget_has_atomic_load_store=\"16\"\ntarget_has_atomic_load_store=\"32\"\ntarget_has_atomic_load_store=\"64\"\ntarget_has_atomic_load_store=\"8\"\ntarget_has_atomic_load_store=\"ptr\"\ntarget_has_reliable_f128\ntarget_has_reliable_f16\ntarget_has_reliable_f16_math\ntarget_os=\"linux\"\ntarget_pointer_width=\"64\"\ntarget_thread_local\ntarget_vendor=\"unknown\"\nub_checks\nunix\n","stderr":""},"17747080675513052775":{"success":true,"status":"","code":0,"stdout":"rustc 1.92.0-nightly (b6f0945e4 2025-10-08)\nbinary: rustc\ncommit-hash: b6f0945e4681bc4d2faa7c22c5f61dc36abf7dd2\ncommit-date: 2025-10-08\nhost: x86_64-unknown-linux-gnu\nrelease: 1.92.0-nightly\nLLVM version: 21.1.2\n","stderr":""}},"successes":{}}
+{"rustc_fingerprint":13532102840378780987,"outputs":{"7971740275564407648":{"success":true,"status":"","code":0,"stdout":"___\nlib___.rlib\nlib___.so\nlib___.so\nlib___.a\nlib___.so\n/nix/store/ykm6in4f9h723ca61pwmiyc0mzibrbcz-rust-default-1.92.0-nightly-2025-10-09\noff\npacked\nunpacked\n___\ndebug_assertions\nfmt_debug=\"full\"\noverflow_checks\npanic=\"unwind\"\nproc_macro\nrelocation_model=\"pic\"\ntarget_abi=\"\"\ntarget_arch=\"x86_64\"\ntarget_endian=\"little\"\ntarget_env=\"gnu\"\ntarget_family=\"unix\"\ntarget_feature=\"fxsr\"\ntarget_feature=\"sse\"\ntarget_feature=\"sse2\"\ntarget_feature=\"x87\"\ntarget_has_atomic\ntarget_has_atomic=\"16\"\ntarget_has_atomic=\"32\"\ntarget_has_atomic=\"64\"\ntarget_has_atomic=\"8\"\ntarget_has_atomic=\"ptr\"\ntarget_has_atomic_equal_alignment=\"16\"\ntarget_has_atomic_equal_alignment=\"32\"\ntarget_has_atomic_equal_alignment=\"64\"\ntarget_has_atomic_equal_alignment=\"8\"\ntarget_has_atomic_equal_alignment=\"ptr\"\ntarget_has_atomic_load_store\ntarget_has_atomic_load_store=\"16\"\ntarget_has_atomic_load_store=\"32\"\ntarget_has_atomic_load_store=\"64\"\ntarget_has_atomic_load_store=\"8\"\ntarget_has_atomic_load_store=\"ptr\"\ntarget_has_reliable_f128\ntarget_has_reliable_f16\ntarget_has_reliable_f16_math\ntarget_os=\"linux\"\ntarget_pointer_width=\"64\"\ntarget_thread_local\ntarget_vendor=\"unknown\"\nub_checks\nunix\n","stderr":""},"2668284298704293751":{"success":true,"status":"","code":0,"stdout":"___\nlib___.rlib\nlib___.a\n/nix/store/ykm6in4f9h723ca61pwmiyc0mzibrbcz-rust-default-1.92.0-nightly-2025-10-09\noff\n___\ndebug_assertions\nfmt_debug=\"full\"\noverflow_checks\npanic=\"abort\"\nproc_macro\nrelocation_model=\"static\"\ntarget_abi=\"eabihf\"\ntarget_arch=\"arm\"\ntarget_endian=\"little\"\ntarget_env=\"\"\ntarget_feature=\"dsp\"\ntarget_feature=\"fpregs\"\ntarget_feature=\"mclass\"\ntarget_feature=\"thumb-mode\"\ntarget_feature=\"thumb2\"\ntarget_feature=\"v5te\"\ntarget_feature=\"v6\"\ntarget_feature=\"v6k\"\ntarget_feature=\"v6t2\"\ntarget_feature=\"v7\"\ntarget_has_atomic\ntarget_has_atomic=\"16\"\ntarget_has_atomic=\"32\"\ntarget_has_atomic=\"8\"\ntarget_has_atomic=\"ptr\"\ntarget_has_atomic_equal_alignment=\"16\"\ntarget_has_atomic_equal_alignment=\"32\"\ntarget_has_atomic_equal_alignment=\"8\"\ntarget_has_atomic_equal_alignment=\"ptr\"\ntarget_has_atomic_load_store\ntarget_has_atomic_load_store=\"16\"\ntarget_has_atomic_load_store=\"32\"\ntarget_has_atomic_load_store=\"8\"\ntarget_has_atomic_load_store=\"ptr\"\ntarget_has_reliable_f128\ntarget_has_reliable_f16\ntarget_has_reliable_f16_math\ntarget_os=\"none\"\ntarget_pointer_width=\"32\"\ntarget_vendor=\"unknown\"\nub_checks\n","stderr":"warning: dropping unsupported crate type `dylib` for target `thumbv7em-none-eabihf`\n\nwarning: dropping unsupported crate type `cdylib` for target `thumbv7em-none-eabihf`\n\nwarning: dropping unsupported crate type `proc-macro` for target `thumbv7em-none-eabihf`\n\nwarning: 3 warnings emitted\n\n"},"17747080675513052775":{"success":true,"status":"","code":0,"stdout":"rustc 1.92.0-nightly (b6f0945e4 2025-10-08)\nbinary: rustc\ncommit-hash: b6f0945e4681bc4d2faa7c22c5f61dc36abf7dd2\ncommit-date: 2025-10-08\nhost: x86_64-unknown-linux-gnu\nrelease: 1.92.0-nightly\nLLVM version: 21.1.2\n","stderr":""}},"successes":{}}