Fix core::panic! not printing in examples (#153)

* fixes panic not showing in examples
removes panic_immediate_abort feature where present, renames config -> config.toml, enables panic-probe defmt printing feature and updates panic-probe to 0.2

* fix unintended changes in build_core and arch

* revert uninteded change

embassy-nrf-examples/.cargo/config.toml

@@ -1,6 +1,5 @@
 [unstable]
 build-std = ["core"]
-build-std-features = ["panic_immediate_abort"]
 
 [target.'cfg(all(target_arch = "arm", target_os = "none"))']
 runner = "probe-run --chip nRF52840_xxAA"
@@ -19,4 +18,3 @@ rustflags = [
 
 [build]
 target = "thumbv7em-none-eabi"
-

embassy-nrf-examples/Cargo.toml

@@ -27,5 +27,5 @@ defmt-rtt = "0.2.0"
 cortex-m = { version = "0.7.1", features = ["inline-asm"] }
 cortex-m-rt = "0.6.13"
 embedded-hal    = { version = "0.2.4" }
-panic-probe = "0.1.0"
+panic-probe = { version = "0.2.0", features = ["print-defmt"] }
 futures = { version = "0.3.8", default-features = false, features = ["async-await"] }

embassy-rp-examples/.cargo/config.toml

@@ -1,6 +1,5 @@
 [unstable]
 build-std = ["core"]
-build-std-features = ["panic_immediate_abort"]
 
 [target.'cfg(all(target_arch = "arm", target_os = "none"))']
 runner = "probe-run-rp --chip RP2040"

embassy-rp-examples/Cargo.toml

@@ -28,5 +28,5 @@ defmt-rtt = "0.2.0"
 cortex-m = { version = "0.7.1", features = ["inline-asm"] }
 cortex-m-rt = "0.6.13"
 embedded-hal    = { version = "0.2.4" }
-panic-probe = "0.1.0"
+panic-probe = { version = "0.2.0", features = ["print-defmt"] }
 futures = { version = "0.3.8", default-features = false, features = ["async-await", "cfg-target-has-atomic", "unstable"] }

embassy-stm32-examples/Cargo.toml

@@ -46,7 +46,7 @@ defmt-rtt = "0.2.0"
 cortex-m = "0.7.1"
 cortex-m-rt = "0.6.13"
 embedded-hal    = { version = "0.2.4" }
-panic-probe = "0.1.0"
+panic-probe = { version = "0.2.0", features = ["print-defmt"] }
 futures = { version = "0.3.8", default-features = false, features = ["async-await"] }
 rtt-target = { version = "0.3", features = ["cortex-m"] }
 bxcan = "0.5.0"