simple picorom interface

Cargo.toml

@@ -9,13 +9,52 @@ test = false
 bench = false
 
 [dependencies]
-cortex-m = "0.7"
+cortex-m = { version = "0.7", features = ["inline-asm"] }
 cortex-m-rt = "0.7"
 panic-probe = { version = "1.0", features = ["print-defmt", "defmt-error"] }
 rp-pico = "0.9"
 embedded-hal = "1.0"
 pio = "0.2"
 pio-proc = "0.2"
+usb-device = { version = "0.3", features = ["defmt"] }
+usbd-serial = "0.2"
 
 defmt = "1.0"
 defmt-rtt = "1.1"
+
+num_enum = { version = "0.7", default-features = false }
+heapless = "0.9"
+
+# cargo build/run
+[profile.dev]
+codegen-units = 1
+debug = 2
+debug-assertions = true
+incremental = false
+opt-level = 3
+overflow-checks = true
+
+# cargo build/run --release
+[profile.release]
+codegen-units = 1
+debug = 2
+debug-assertions = false
+incremental = false
+lto = 'fat'
+opt-level = 3
+overflow-checks = false
+
+# do not optimize proc-macro crates = faster builds from scratch
+[profile.dev.build-override]
+codegen-units = 8
+debug = false
+debug-assertions = false
+opt-level = 0
+overflow-checks = false
+
+[profile.release.build-override]
+codegen-units = 8
+debug = false
+debug-assertions = false
+opt-level = 0
+overflow-checks = false