Test no_std too

Author: jonhoo

azure-pipelines.yml

@@ -1,10 +1,21 @@
 jobs:
  - template: default.yml@templates
    parameters:
-     codecov_token: $(CODECOV_TOKEN_SECRET)
      minrust: 1.32.0
-     env:
-       RUST_BACKTRACE: 1
+     codecov_token: $(CODECOV_TOKEN_SECRET)
+ - job: no_std
+   dependsOn: []
+   displayName: "Compile-check on no_std target"
+   pool:
+     vmImage: ubuntu-latest
+   steps:
+     - template: install-rust.yml@templates
+       parameters:
+         rust: nightly
+         targets:
+          - thumbv7m-none-eabi
+     - bash: cargo check --target thumbv7m-none-eabi
+       displayName: cargo check --target thumbv7m-none-eabi
  - job: features
    displayName: "Check feature combinations"
    pool: