Rewrite firmware: use postcard over USB MIDI (SysEx)

2026-01-09 16:34:50 +08:00
parent efc503df33
commit c0c65f1fae
17 changed files with 911 additions and 1175 deletions
@@ -1 +1 @@
-/target
+target/
@@ -4,9 +4,9 @@ version = 4
 [[package]]
 name = "ahash"
-version = "0.8.11"
+version = "0.8.12"
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-checksum = "e89da841a80418a9b391ebaea17f5c112ffaaa96f621d2c285b5174da76b9011"
+checksum = "5a15f179cd60c4584b8a8c596927aadc462e27f2ca70c04e0071964a73ba7a75"
 dependencies = [
 "cfg-if",
 "once_cell",
@@ -16,9 +16,9 @@ dependencies = [
 [[package]]
 name = "aligned"
-version = "0.4.2"
+version = "0.4.3"
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+checksum = "ee4508988c62edf04abd8d92897fca0c2995d907ce1dfeaf369dac3716a40685"
 dependencies = [
 "as-slice",
 ]
@@ -33,10 +33,19 @@ dependencies = [
 ]
 [[package]]
-name = "autocfg"
+name = "atomic-polyfill"
-version = "1.4.0"
+version = "1.0.3"
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-checksum = "ace50bade8e6234aa140d9a2f552bbee1db4d353f69b8217bc503490fc1a9f26"
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 "critical-section",
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 [[package]]
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 [[package]]
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@@ -50,7 +59,7 @@ version = "0.2.5"
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 checksum = "5deb64efa5bd81e31fcd1938615a6d98c82eafcbcd787162b6f63b91d6bac5b3"
 dependencies = [
- "rustc_version",
+ "rustc_version 0.2.3",
 ]
 [[package]]
@@ -61,9 +70,9 @@ checksum = "72b3254f16251a8381aa12e40e3c4d2f0199f8c6508fbecb9d91f575e0fbb8c6"
 [[package]]
 name = "bit_field"
-version = "0.10.2"
+version = "0.10.3"
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-checksum = "dc827186963e592360843fb5ba4b973e145841266c1357f7180c43526f2e5b61"
+checksum = "1e4b40c7323adcfc0a41c4b88143ed58346ff65a288fc144329c5c45e05d70c6"
 [[package]]
 name = "bitfield"
@@ -85,9 +94,9 @@ checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
 [[package]]
 name = "bitflags"
-version = "2.9.0"
+version = "2.10.0"
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-checksum = "5c8214115b7bf84099f1309324e63141d4c5d7cc26862f97a0a857dbefe165bd"
+checksum = "812e12b5285cc515a9c72a5c1d3b6d46a19dac5acfef5265968c166106e31dd3"
 [[package]]
 name = "block-device-driver"
@@ -106,9 +115,18 @@ checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
 [[package]]
 name = "cfg-if"
-version = "1.0.0"
+version = "1.0.4"
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-checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
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 [[package]]
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@@ -140,7 +158,7 @@ checksum = "e37549a379a9e0e6e576fd208ee60394ccb8be963889eebba3ffe0980364f472"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.98",
+ "syn 2.0.112",
 ]
 [[package]]
@@ -151,9 +169,9 @@ checksum = "790eea4361631c5e7d22598ecd5723ff611904e3344ce8720784c93e3d83d40b"
 [[package]]
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+version = "0.20.11"
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-checksum = "6f63b86c8a8826a49b8c21f08a2d07338eec8d900540f8630dc76284be802989"
+checksum = "fc7f46116c46ff9ab3eb1597a45688b6715c6e628b5c133e288e709a29bcb4ee"
 dependencies = [
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 "darling_macro",
@@ -161,27 +179,27 @@ dependencies = [
 [[package]]
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-version = "0.20.10"
+version = "0.20.11"
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-checksum = "95133861a8032aaea082871032f5815eb9e98cef03fa916ab4500513994df9e5"
+checksum = "0d00b9596d185e565c2207a0b01f8bd1a135483d02d9b7b0a54b11da8d53412e"
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 "ident_case",
 "proc-macro2",
 "quote",
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+ "syn 2.0.112",
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 [[package]]
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+version = "0.20.11"
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+checksum = "fc34b93ccb385b40dc71c6fceac4b2ad23662c7eeb248cf10d529b7e055b6ead"
 dependencies = [
 "darling_core",
 "quote",
- "syn 2.0.98",
+ "syn 2.0.112",
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 [[package]]
@@ -213,7 +231,7 @@ dependencies = [
 "proc-macro-error2",
 "proc-macro2",
 "quote",
- "syn 2.0.98",
+ "syn 2.0.112",
 ]
 [[package]]
@@ -227,9 +245,9 @@ dependencies = [
 [[package]]
 name = "defmt-rtt"
-version = "1.0.0"
+version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b2cac3b8a5644a9e02b75085ebad3b6deafdbdbdec04bb25086523828aa4dfd1"
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 dependencies = [
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 "defmt 1.0.1",
@@ -237,21 +255,22 @@ dependencies = [
 [[package]]
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-version = "0.2.11"
+version = "0.2.12"
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-checksum = "95249b50c6c185bee49034bcb378a49dc2b5dff0be90ff6616d31d64febab05d"
+checksum = "d4b8a88685455ed29a21542a33abd9cb6510b6b129abadabdcef0f4c55bc8f61"
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 "litrs",
 ]
 [[package]]
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+ "defmt 1.0.1",
 "embassy-futures",
 "embassy-hal-internal 0.3.0",
 "embassy-sync",
 "embassy-time",
 "embedded-hal 0.2.7",
@@ -264,47 +283,63 @@ dependencies = [
 [[package]]
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-version = "0.7.0"
+version = "0.9.1"
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 dependencies = [
 "cortex-m",
 "critical-section",
- "defmt 0.3.100",
+ "defmt 1.0.1",
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 "embassy-executor-timer-queue",
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 [[package]]
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 dependencies = [
 "darling",
 "proc-macro2",
 "quote",
- "syn 2.0.98",
+ "syn 2.0.112",
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 [[package]]
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+name = "embassy-executor-timer-queue"
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+version = "0.1.0"
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 dependencies = [
- "defmt 0.3.100",
+ "defmt 1.0.1",
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 [[package]]
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 dependencies = [
 "cortex-m",
 "critical-section",
- "defmt 0.3.100",
+ "defmt 1.0.1",
 "num-traits",
 ]
@@ -319,9 +354,9 @@ dependencies = [
 [[package]]
 name = "embassy-net-driver-channel"
-version = "0.3.0"
+version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
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 dependencies = [
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 "embassy-net-driver",
@@ -330,23 +365,23 @@ dependencies = [
 [[package]]
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-version = "0.2.0"
+version = "0.5.0"
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 dependencies = [
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 "bit_field",
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+ "bitflags 2.10.0",
 "block-device-driver",
 "cfg-if",
 "cortex-m",
 "cortex-m-rt",
 "critical-section",
- "defmt 0.3.100",
+ "defmt 1.0.1",
 "document-features",
 "embassy-embedded-hal",
 "embassy-futures",
- "embassy-hal-internal",
+ "embassy-hal-internal 0.4.0",
 "embassy-net-driver",
 "embassy-sync",
 "embassy-time",
@@ -359,107 +394,112 @@ dependencies = [
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 "embedded-hal-async",
 "embedded-hal-nb",
- "embedded-io",
+ "embedded-io 0.7.1",
- "embedded-io-async",
+ "embedded-io-async 0.7.0",
 "embedded-storage",
 "embedded-storage-async",
 "futures-util",
 "heapless 0.9.2",
 "nb 1.1.0",
 "proc-macro2",
 "quote",
- "rand_core",
+ "rand_core 0.6.4",
 "rand_core 0.9.3",
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 "static_assertions",
 "stm32-fmc",
 "stm32-metapac",
 "trait-set",
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 dependencies = [
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 "critical-section",
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 "futures-core",
 "futures-sink",
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 "heapless",
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 "critical-section",
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+ "defmt 1.0.1",
 "document-features",
 "embassy-time-driver",
 "embedded-hal 0.2.7",
 "embedded-hal 1.0.0",
 "embedded-hal-async",
- "futures-util",
+ "futures-core",
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 [[package]]
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+ "embassy-executor-timer-queue",
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+ "heapless 0.8.0",
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 "embassy-sync",
 "embassy-usb-driver",
- "heapless",
+ "embedded-io-async 0.6.1",
 "heapless 0.8.0",
 "ssmarshal",
 "usbd-hid",
 ]
 [[package]]
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+ "defmt 1.0.1",
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 "critical-section",
- "defmt 0.3.100",
+ "defmt 1.0.1",
 "embassy-sync",
 "embassy-usb-driver",
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@@ -481,6 +521,7 @@ checksum = "0649998afacf6d575d126d83e68b78c0ab0e00ca2ac7e9b3db11b4cbe8274ef0"
 dependencies = [
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 "embedded-graphics-core",
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@@ -494,6 +535,7 @@ checksum = "ba9ecd261f991856250d2207f6d8376946cd9f412a2165d3b75bc87a0bc7a044"
 dependencies = [
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 "defmt 0.3.100",
 ]
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+ "defmt 1.0.1",
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 [[package]]
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 checksum = "3ff09972d4073aa8c299395be75161d582e7629cd663171d62af73c8d50dba3f"
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+ "embedded-io 0.6.1",
- "embedded-io",
+]
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 [[package]]
 name = "hash32"
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@@ -656,13 +722,37 @@ dependencies = [
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@@ -692,20 +782,31 @@ dependencies = [
 "embedded-hal-bus",
 "epd-waveshare",
 "panic-probe",
- "usbd-hid",
+ "postcard",
 "serde",
 "static_cell",
 ]
 [[package]]
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 [[package]]
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 "serde",
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@@ -790,23 +903,23 @@ dependencies = [
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 "quote",
- "syn 2.0.98",
+ "syn 2.0.112",
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 [[package]]
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 dependencies = [
- "semver",
+ "semver 0.9.0",
 ]
 [[package]]
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+version = "0.4.1"
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 [[package]]
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 [[package]]
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- "syn 2.0.98",
+ "syn 2.0.112",
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 [[package]]
@@ -879,9 +1038,9 @@ dependencies = [
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 [[package]]
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- "embedded-hal 0.2.7",
+ "portable-atomic",
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 ]
 [[package]]
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 dependencies = [
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 "cortex-m-rt",
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 [[package]]
@@ -927,9 +1096,9 @@ dependencies = [
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 dependencies = [
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 "quote",
@@ -938,29 +1107,40 @@ dependencies = [
 [[package]]
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 dependencies = [
 "thiserror-impl",
 ]
 [[package]]
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 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.98",
+ "syn 2.0.112",
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 dependencies = [
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 "quote",
 "syn 1.0.109",
 ]
 [[package]]
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 [[package]]
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@@ -968,7 +1148,7 @@ version = "0.3.2"
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 checksum = "98816b1accafbb09085168b90f27e93d790b4bfa19d883466b5e53315b5f06a6"
 dependencies = [
- "heapless",
+ "heapless 0.8.0",
 "portable-atomic",
 ]
@@ -1038,20 +1218,20 @@ dependencies = [
 [[package]]
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-version = "0.7.35"
+version = "0.8.31"
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+checksum = "fd74ec98b9250adb3ca554bdde269adf631549f51d8a8f8f0a10b50f1cb298c3"
 dependencies = [
 "zerocopy-derive",
 ]
 [[package]]
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 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.98",
+ "syn 2.0.112",
 ]
@@ -4,45 +4,47 @@ version = "0.1.0"
 edition = "2024"
 [dependencies]
-embassy-stm32 = { version = "0.2", features = [
+base64 = { version = "0.22.1", default-features = false }
-  "defmt",
+cortex-m = { version = "0.7.7", features = [
-  "stm32f411ce",
+  "inline-asm",
-  "memory-x",
+  "critical-section-single-core",
  "time-driver-any",
  "exti",
 ] }
-embassy-sync = { version = "0.6", features = ["defmt"] }
+cortex-m-rt = "0.7.5"
-embassy-executor = { version = "0.7", features = [
+critical-section = "1.2.0"
-  "nightly",
+defmt = "1.0.1"
 defmt-rtt = "1.1.0"
 embassy-executor = { version = "0.9.1", features = [
  "arch-cortex-m",
  "executor-thread",
  "executor-interrupt",
  "defmt",
 ] }
-embassy-time = { version = "0.4", features = [
+embassy-futures = { version = "0.1.2", features = ["defmt"] }
 embassy-stm32 = { version = "0.5.0", features = [
  "stm32f411ce",
  "defmt",
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  "unstable-pac",
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 ] }
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 embassy-time = { version = "0.5.0", features = [
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  "defmt-timestamp-uptime",
  "tick-hz-32_768",
 ] }
-embassy-usb = { version = "0.4", features = ["defmt"] }
+embassy-usb = { version = "0.5.1", features = ["defmt"] }
-embassy-futures = { version = "0.1", features = ["defmt"] }
+embedded-graphics = { version = "0.8.1", features = ["defmt"] }
 embedded-hal-bus = { version = "0.3.0", features = ["async"] }
 epd-waveshare = "0.6.0"
 panic-probe = { version = "1.0.0", features = ["print-defmt"] }
 postcard = { version = "1.1.3", features = ["defmt"] }
 serde = { version = "1.0.228", default-features = false, features = ["derive"] }
 static_cell = "2.1.1"
-defmt = "1.0"
+[profile.dev]
-defmt-rtt = "1.0"
+opt-level = "s"
 cortex-m = { version = "0.7", features = [
  "inline-asm",
  "critical-section-single-core",
 ] }
 cortex-m-rt = "0.7"
 embedded-hal-bus = { version = "0.3", features = ["async"] }
 panic-probe = { version = "1.0", features = ["print-defmt"] }
 critical-section = "1.1"
 epd-waveshare = "0.6"
 embedded-graphics = "0.8"
 usbd-hid = "0.8"
 base64 = { version = "0.22", default-features = false }
 [profile.release]
-opt-level = "z"
+opt-level = "s"
@@ -1,674 +0,0 @@
                    GNU GENERAL PUBLIC LICENSE
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 Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
 Everyone is permitted to copy and distribute verbatim copies
 of this license document, but changing it is not allowed.
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@@ -1,5 +1,7 @@
 # Inkclip Firmware
 > WARNING! Contents below are outdated; we are currently using a USB MIDI-based firmware for better cross-platform compatibility.
 This is the firmware implementation for Inkclip. It implements a USB 2.0 HID device with the following reports:
 - **Write Pattern:** Report ID = 0x01, Direction = Output (host to device), Size = 5,000 bytes.
@@ -0,0 +1,247 @@
 use core::cmp::Ordering;
 use crate::{
    epd::Epd,
    midi::UsbMidi,
    pack::{decode_7in8, encode_7in8},
    sysex::{SysExEncoder, SysExParser},
    uid::uid_base64,
 };
 use defmt::{error, info, warn};
 use embassy_executor::task;
 use embassy_usb::driver::EndpointError;
 use embedded_graphics::prelude::*;
 use epd_waveshare::{epd1in54::Display1in54, prelude::*};
 use serde::{Deserialize, Serialize};
 #[derive(Serialize)]
 enum DeviceType {
    BWRev1, // Black-and-white, API Rev. 1
 }
 #[derive(Deserialize)]
 enum Chroma {
    Black,
 }
 #[derive(Deserialize)]
 enum Request<'a> {
    GetIdentification,
    UpdateDisplay,
    SetPattern {
        from: u32,
        to: u32,
        chroma: Chroma,
        pattern: &'a [u8],
    },
 }
 #[derive(Serialize)]
 enum Response<'a> {
    GetIdentification { serial: &'a str, model: DeviceType },
    UpdateDisplay,
    SetPattern,
 }
 const PATTERN_SIZE: usize = 5000;
 const MAGIC_NUMBER_LEN: usize = 1;
 const MAGIC_NUMBER: [u8; MAGIC_NUMBER_LEN] = [0x7d]; // Generic educational/R&D
 #[task]
 pub async fn app_task(epd: Epd, midi: UsbMidi) {
    App {
        epd,
        midi,
        pattern: [0; PATTERN_SIZE],
    }
    .run()
    .await
 }
 struct App {
    epd: Epd,
    midi: UsbMidi,
    pattern: [u8; PATTERN_SIZE],
 }
 impl App {
    async fn handle_request<'a>(&mut self, req: Request<'a>) {
        match req {
            Request::SetPattern {
                from,
                to,
                chroma,
                pattern,
            } => self.handle_set_pattern(from, to, chroma, pattern).await,
            Request::UpdateDisplay => self.handle_update_display().await,
            Request::GetIdentification => self.handle_get_identification().await,
        }
    }
    async fn handle_set_pattern(&mut self, from: u32, to: u32, _chroma: Chroma, pattern: &[u8]) {
        let from = from as usize;
        let to = to as usize;
        if from >= PATTERN_SIZE || to > PATTERN_SIZE || from > to {
            warn!(
                "SetPattern: 'from' and/or 'to' out of range (from = {}, to = {}, PATTERN_SIZE = {})",
                from, to, PATTERN_SIZE
            );
            return;
        }
        let buf_size = match pattern.len().cmp(&(to - from)) {
            Ordering::Less => {
                warn!(
                    "SetPattern buffer too short (buf_size = {}, range_size = {})",
                    pattern.len(),
                    to - from,
                );
                pattern.len()
            }
            Ordering::Equal => pattern.len(),
            Ordering::Greater => {
                warn!(
                    "SetPattern buffer too long; truncating (buf_size = {}, range_size = {})",
                    pattern.len(),
                    to - from,
                );
                to - from
            }
        };
        for (stride, &byte) in pattern[..buf_size].iter().enumerate() {
            self.pattern[from + stride] = byte;
        }
        self.write_response(Response::SetPattern).await;
    }
    async fn handle_update_display(&mut self) {
        let mut display = Display1in54::default();
        display.set_rotation(DisplayRotation::Rotate180);
        let width = display.size().width as i32;
        for (stride, &byte) in self.pattern.iter().enumerate() {
            for stroll in 0..8 {
                let ix = stride as i32 * 8 + stroll;
                let x = ix % width;
                let y = ix / width;
                display.set_pixel(Pixel(Point { x, y }, color_at(byte, stroll)));
            }
        }
        self.epd.update_display(&display);
        self.write_response(Response::UpdateDisplay).await;
    }
    async fn handle_get_identification(&mut self) {
        self.write_response(Response::GetIdentification {
            serial: uid_base64(),
            model: DeviceType::BWRev1,
        })
        .await;
    }
    async fn write_response<'a>(&mut self, resp: Response<'a>) -> bool {
        const RESP_N: usize = 1024;
        let mut resp_buffer = [0u8; RESP_N];
        let Ok(payload_slice) = postcard::to_slice(&resp, &mut resp_buffer) else {
            error!("write_response: postcard encoding overflows the buffer");
            return false;
        };
        let mut encode_buffer = [0u8; RESP_N];
        encode_buffer[..MAGIC_NUMBER_LEN].copy_from_slice(&MAGIC_NUMBER);
        let Some(encoded_len) = encode_7in8(payload_slice, &mut encode_buffer[MAGIC_NUMBER_LEN..])
        else {
            error!("write_response: 7-in-8 encoding overflows the buffer");
            return false;
        };
        let mut sysex_encoder = SysExEncoder::<1024>::new();
        let Some(encoded) = sysex_encoder.encode(&encode_buffer[..MAGIC_NUMBER_LEN + encoded_len])
        else {
            error!("write_response: USB MIDI encoding overflows the buffer");
            return false;
        };
        for chunk in encoded.chunks(64) {
            let Ok(_) = self.midi.write_packet(chunk).await else {
                error!("write_response: failed to write response");
                return false;
            };
        }
        true
    }
    pub async fn run(&mut self) {
        let mut sysex_parser = SysExParser::<8192>::new();
        '_connection: loop {
            self.midi.wait_connection().await;
            'packet: loop {
                let mut packet_in_buf = [0u8; 64];
                match self.midi.read_packet(&mut packet_in_buf).await {
                    Err(EndpointError::BufferOverflow) => {
                        error!(
                            "App: read more than 64 bytes at once from EP. This should not be happening!"
                        )
                    }
                    Err(EndpointError::Disabled) => {
                        info!("App: EP has been disabled; waiting to be enabled again.");
                        break 'packet;
                    }
                    Ok(nread) => {
                        for midi_packet in packet_in_buf[..nread].chunks_exact(4) {
                            let Some(midi_msg) = sysex_parser.feed(midi_packet) else {
                                continue;
                            };
                            let midi_msg_len = midi_msg.len();
                            if midi_msg_len < 2
                                || midi_msg[0] != 0xf0
                                || midi_msg[midi_msg_len - 1] != 0xf7
                            {
                                warn!("App: MIDI event not SysEx; dropping.");
                                continue;
                            }
                            let sysex = &mut midi_msg[1..midi_msg_len - 1];
                            if sysex.len() < MAGIC_NUMBER_LEN
                                || sysex[..MAGIC_NUMBER_LEN] != MAGIC_NUMBER
                            {
                                warn!(
                                    "App: SysEx does not start with magic number; first {} bytes = {}. dropping.",
                                    MAGIC_NUMBER,
                                    sysex[..MAGIC_NUMBER_LEN]
                                );
                                continue;
                            }
                            let Ok(parsed) = postcard::from_bytes::<Request>(decode_7in8(
                                &mut sysex[MAGIC_NUMBER_LEN..],
                            )) else {
                                warn!("App: cannot parse payload. dropping.");
                                continue;
                            };
                            self.handle_request(parsed).await;
                        }
                    }
                }
            }
        }
    }
 }
 fn color_at(byte: u8, ix: i32) -> Color {
    debug_assert!(0 <= ix && ix < 8);
    if byte & (1u8 << ix) == 0 {
        Color::White
    } else {
        Color::Black
    }
 }
@@ -1,23 +0,0 @@
 use usbd_hid::descriptor::generator_prelude::*;
 // Watch out the terminology!
 // - An "output" report is a report from the host to the device (as the device is the one doing the output);
 // - An "input" report is a report from the device to the host (as it is presumably triggered by user input).
 #[gen_hid_descriptor(
    (usage_page = VENDOR_DEFINED_END, usage = 0x01, collection = APPLICATION) = {
        (report_id = 0x01, usage = 0x02) = {
            write_pattern = output;
        };
        (report_id = 0x02, usage = 0x03) = {
            serial_number_request = output;
        };
        (report_id = 0x02, usage = 0x03) =  {
            serial_number_response = input;
        };
    }
 )]
 pub struct HIDReports {
    write_pattern: [u8; 5000],
    serial_number_request: u8,
    serial_number_response: [u8; 16],
 }
@@ -1,86 +0,0 @@
 use defmt::*;
 use embedded_graphics::prelude::*;
 use epd_waveshare::epd1in54_v2::Display1in54;
 use epd_waveshare::prelude::*;
 use crate::device::epd::Epd;
 use crate::device::usb_hid::Hid;
 use crate::util::{uid_base64, uid_base64_bytes};
 pub mod descriptor;
 pub const USB_READ_BUFFER_SIZE: usize = 8192;
 pub const USB_WRITE_BUFFER_SIZE: usize = 32;
 const WRITE_PATTERN_REPORT_ID: u8 = 0x01;
 const SERIAL_NUMBER_REPORT_ID: u8 = 0x02;
 fn color_at(byte: u8, ix: i32) -> Color {
    defmt::debug_assert!(0 <= ix && ix < 8);
    if byte & (1u8 << ix) == 0 {
        Color::White
    } else {
        Color::Black
    }
 }
 pub struct MainLoop<'a> {
    pub hid: Hid<'a, USB_READ_BUFFER_SIZE, USB_WRITE_BUFFER_SIZE>,
    pub epd: Epd,
 }
 impl<'a> MainLoop<'a> {
    fn draw_pattern(&mut self, buf: &[u8]) {
        debug!("Updating display");
        let mut buf_size = buf.len();
        if buf_size < 5000 {
            warn!("WRITE_PATTERN buffer too short (buf_size = {})", buf_size);
        } else if buf_size > 5000 {
            warn!(
                "WRITE_PATTERN buffer too long; truncating (buf_size = {})",
                buf_size
            );
            buf_size = 5000;
        }
        let mut display = Display1in54::default();
        display.set_rotation(DisplayRotation::Rotate180);
        let width = display.size().width as i32;
        for (stride, &byte) in buf[..buf_size].iter().enumerate() {
            for stroll in 0..8 {
                let ix = stride as i32 * 8 + stroll;
                let x = ix % width;
                let y = ix / width;
                display.set_pixel(Pixel(Point { x, y }, color_at(byte, stroll)));
            }
        }
        self.epd.update_display(&display);
    }
    async fn send_serial_number(&mut self) {
        debug!("Sending serial number {}", uid_base64());
        self.hid
            .write(SERIAL_NUMBER_REPORT_ID, uid_base64_bytes())
            .await;
    }
    pub async fn run(&mut self) -> ! {
        let mut read_buf = [0u8; USB_READ_BUFFER_SIZE];
        loop {
            let (id, buf) = self.hid.read(&mut read_buf).await;
            match id {
                WRITE_PATTERN_REPORT_ID => self.draw_pattern(buf),
                SERIAL_NUMBER_REPORT_ID => self.send_serial_number().await,
                _ => warn!("Unknown report ID: {}", buf[0]),
            }
        }
    }
 }
@@ -1,2 +0,0 @@
 pub mod epd;
 pub mod usb_hid;
@@ -1,120 +0,0 @@
 use defmt::*;
 use embassy_stm32::peripherals::USB_OTG_FS;
 use embassy_stm32::usb::{self, DmPin, DpPin};
 use embassy_usb::class::hid::{self, HidReader, HidReaderWriter, HidWriter};
 use embassy_usb::driver::EndpointError;
 use crate::init::Irqs;
 pub type UsbBuilder<'d> = embassy_usb::Builder<'d, usb::Driver<'d, USB_OTG_FS>>;
 pub fn get_usb_builder<'d>(
    usb_peri: USB_OTG_FS,
    dp: impl DpPin<USB_OTG_FS>,
    dm: impl DmPin<USB_OTG_FS>,
    ep_out_buffer: &'d mut [u8],
    driver_config: usb::Config,
    builder_config: embassy_usb::Config<'d>,
    config_descriptor: &'d mut [u8],
    bos_descriptor: &'d mut [u8],
    msos_descriptor: &'d mut [u8],
    control_buf: &'d mut [u8],
 ) -> UsbBuilder<'d> {
    let driver = usb::Driver::new_fs(usb_peri, Irqs, dp, dm, ep_out_buffer, driver_config);
    return embassy_usb::Builder::new(
        driver,
        builder_config,
        config_descriptor,
        bos_descriptor,
        msos_descriptor,
        control_buf,
    );
 }
 pub struct Hid<'d, const READ_N: usize, const WRITE_N: usize> {
    reader: HidReader<'d, usb::Driver<'d, USB_OTG_FS>, READ_N>,
    writer: HidWriter<'d, usb::Driver<'d, USB_OTG_FS>, WRITE_N>,
 }
 impl<'d, const READ_N: usize, const WRITE_N: usize> Hid<'d, READ_N, WRITE_N> {
    pub fn new(
        usb_builder: &mut UsbBuilder<'d>,
        report_descriptor: &'d [u8],
        state: &'d mut hid::State<'d>,
    ) -> Hid<'d, READ_N, WRITE_N> {
        let hid_config = hid::Config {
            report_descriptor,
            request_handler: None,
            poll_ms: 10,
            max_packet_size: 64,
        };
        let (reader, writer) = HidReaderWriter::new(usb_builder, state, hid_config).split();
        return Hid { reader, writer };
    }
    async fn internal_read<'a, const USE_ID: bool>(
        &mut self,
        buf: &'a mut [u8; READ_N],
    ) -> (u8, &'a [u8]) {
        loop {
            match self.reader.read(buf).await {
                Ok(len) => {
                    if USE_ID {
                        if len < 1 {
                            warn!("Received no report ID")
                        } else {
                            return (buf[0], &buf[1..len]);
                        }
                    } else {
                        return (0, &buf[..len]);
                    }
                }
                Err(hid::ReadError::BufferOverflow) => {
                    warn!("Buffer overflow when reading from host")
                }
                Err(hid::ReadError::Disabled) => {
                    info!("Endpoint disabled");
                    self.reader.ready().await
                }
                Err(hid::ReadError::Sync(_)) => defmt::unreachable!(),
            }
        }
    }
    pub async fn read<'a>(&mut self, buf: &'a mut [u8; READ_N]) -> (u8, &'a [u8]) {
        self.internal_read::<true>(buf).await
    }
    #[allow(dead_code)]
    pub async fn read_no_id<'a>(&mut self, buf: &'a mut [u8; READ_N]) -> &'a [u8] {
        self.internal_read::<false>(buf).await.1
    }
    pub async fn write(&mut self, id: u8, report: &[u8]) {
        let payload_size = report.len() + 1;
        if payload_size > WRITE_N {
            error!(
                "Buffer overflow when writing to host (report_size = {})",
                payload_size
            );
            return;
        }
        let mut payload = [id; WRITE_N];
        payload[1..payload_size].copy_from_slice(report);
        self.writer
            .write(&payload[..payload_size])
            .await
            .unwrap_or_else(|err| match err {
                EndpointError::BufferOverflow => error!("Buffer overflow when writing to host"),
                EndpointError::Disabled => warn!("Endpoint disabled"),
            });
        info!("Written report #{}: {}", id, report);
    }
 }
@@ -1,3 +1,4 @@
 use embassy_stm32::Peri;
 use embassy_stm32::gpio::{self, Level, Pull, Speed};
 use embassy_stm32::spi::{self, MosiPin, SckPin, Spi};
 use embassy_stm32::time::Hertz;
@@ -8,8 +9,11 @@ use epd_waveshare::epd1in54::Display1in54;
 use epd_waveshare::epd1in54_v2::Epd1in54;
 use epd_waveshare::prelude::*;
-type EpdSpiDevice =
+type EpdSpiDevice = ExclusiveDevice<
-    ExclusiveDevice<Spi<'static, embassy_stm32::mode::Blocking>, gpio::Output<'static>, Delay>;
+    Spi<'static, embassy_stm32::mode::Blocking, spi::mode::Master>,
    gpio::Output<'static>,
    Delay,
 >;
 pub struct Epd {
    spi_device: EpdSpiDevice,
@@ -24,13 +28,13 @@ pub struct Epd {
 impl Epd {
    pub fn new<SPI: spi::Instance>(
-        spi: SPI,
+        spi: Peri<'static, SPI>,
-        cs: impl gpio::Pin,
+        cs: Peri<'static, impl gpio::Pin>,
-        sck: impl SckPin<SPI>,
+        sck: Peri<'static, impl SckPin<SPI>>,
-        mosi: impl MosiPin<SPI>,
+        mosi: Peri<'static, impl MosiPin<SPI>>,
-        busy: impl gpio::Pin,
+        busy: Peri<'static, impl gpio::Pin>,
-        dc: impl gpio::Pin,
+        dc: Peri<'static, impl gpio::Pin>,
-        rst: impl gpio::Pin,
+        rst: Peri<'static, impl gpio::Pin>,
    ) -> Epd {
        let cs_pin = gpio::Output::new(cs, Level::High, Speed::VeryHigh);
        let busy_pin = gpio::Input::new(busy, Pull::Down);
@@ -1,35 +0,0 @@
 use embassy_stm32::bind_interrupts;
 use embassy_stm32::peripherals::USB_OTG_FS;
 use embassy_stm32::time::Hertz;
 use embassy_stm32::usb;
 use embassy_stm32::{Config, Peripherals};
 bind_interrupts!(pub struct Irqs {
  OTG_FS => usb::InterruptHandler<USB_OTG_FS>;
 });
 pub fn init_peripherals() -> Peripherals {
    let mut config = Config::default();
    {
        use embassy_stm32::rcc::*;
        config.rcc.hse = Some(Hse {
            freq: Hertz(12_000_000),
            mode: HseMode::Oscillator,
        });
        config.rcc.pll_src = PllSource::HSE;
        config.rcc.pll = Some(Pll {
            prediv: PllPreDiv::DIV12,  // 12 / 12 = 1 MHz
            mul: PllMul::MUL192,       // 1 * 192 = 192 MHz
            divp: Some(PllPDiv::DIV2), // 192 / 2 = 96 MHz <= 100 MHz max freq
            divq: Some(PllQDiv::DIV4), // 192 / 4 = 48 MHz necessary for USB
            divr: None,
        });
        config.rcc.ahb_pre = AHBPrescaler::DIV1;
        config.rcc.apb1_pre = APBPrescaler::DIV2;
        config.rcc.apb2_pre = APBPrescaler::DIV4;
        config.rcc.sys = Sysclk::PLL1_P;
        config.rcc.mux.clk48sel = mux::Clk48sel::PLL1_Q;
    }
    return embassy_stm32::init(config);
 }
@@ -1,79 +1,76 @@
 #![no_main]
 #![no_std]
 #![feature(impl_trait_in_assoc_type)]
-use defmt::*;
+use crate::{
-use embassy_executor::Spawner;
+    app::app_task,
-use embassy_futures::join::join;
+    epd::Epd,
    midi::{make_midi_class, make_usb_builder, usb_task},
 };
 use defmt_rtt as _;
 use embassy_executor::{Spawner, main};
 use embassy_stm32::{
    Peripherals, bind_interrupts,
    peripherals::USB_OTG_FS,
    time::Hertz,
    usb::{self},
 };
 use panic_probe as _;
-use device::epd::Epd;
+macro_rules! static_ref {
-use device::usb_hid::Hid;
+    ($ty:ty = $expr:expr) => {{
-use device::usb_hid::get_usb_builder;
+        static CELL: static_cell::StaticCell<$ty> = StaticCell::new();
-use embassy_stm32::usb;
+        CELL.init($expr)
-use embassy_usb::UsbVersion;
+    }};
-use embassy_usb::class::hid;
+}
 use usbd_hid::descriptor::generator_prelude::*;
 use init::init_peripherals;
 use util::uid_base64;
 use app::MainLoop;
 use app::descriptor::HIDReports;
 use {defmt_rtt as _, panic_probe as _};
 mod app;
-mod device;
+mod epd;
-mod init;
+mod midi;
-mod util;
+mod pack;
 mod sysex;
 mod uid;
-#[embassy_executor::main]
+bind_interrupts!(pub struct Irqs {
-async fn main(_spawner: Spawner) {
+  OTG_FS => usb::InterruptHandler<USB_OTG_FS>;
 });
 fn init_peripherals() -> Peripherals {
    embassy_stm32::init({
        use embassy_stm32::rcc::*;
        let mut config = embassy_stm32::Config::default();
        config.rcc.hse = Some(Hse {
            freq: Hertz(12_000_000),
            mode: HseMode::Oscillator,
        });
        config.rcc.pll_src = PllSource::HSE;
        config.rcc.pll = Some(Pll {
            prediv: PllPreDiv::DIV12,  // 12 / 12 = 1 MHz
            mul: PllMul::MUL192,       // 1 * 192 = 192 MHz
            divp: Some(PllPDiv::DIV2), // 192 / 2 = 96 MHz <= 100 MHz max freq
            divq: Some(PllQDiv::DIV4), // 192 / 4 = 48 MHz necessary for USB
            divr: None,
        });
        config.rcc.ahb_pre = AHBPrescaler::DIV1;
        config.rcc.apb1_pre = APBPrescaler::DIV2;
        config.rcc.apb2_pre = APBPrescaler::DIV4;
        config.rcc.sys = Sysclk::PLL1_P;
        config.rcc.mux.clk48sel = mux::Clk48sel::PLL1_Q;
        config
    })
 }
 #[main]
 async fn main(spawner: Spawner) {
    let peri = init_peripherals();
    info!("Initialized peripherals");
    let epd = Epd::new(
        peri.SPI1, peri.PA4, peri.PA5, peri.PA7, peri.PB10, peri.PB0, peri.PB1,
    );
-    info!("Established SPI link to e-paper display");
+    let mut usb_builder = make_usb_builder(peri.USB_OTG_FS, peri.PA12, peri.PA11);
    let midi = make_midi_class(&mut usb_builder);
-    let mut ep_out_buffer = [0u8; 256];
+    spawner.must_spawn(usb_task(usb_builder));
-    let mut config_descriptor = [0; 256];
+    spawner.must_spawn(app_task(epd, midi));
    let mut control_buf = [0; 256];
    let mut state = hid::State::new();
    let mut builder_config = embassy_usb::Config::new(0x1209, 0xc9c9);
    builder_config.manufacturer = Some("daylily");
    builder_config.product = Some("“Inkclip” 1.54″ ePaper Accessory");
    builder_config.serial_number = Some(uid_base64());
    // Caution: past USB 2.0 (including USB 2.1 aka 2.0 LPM), BOS descriptors become necessary
    builder_config.bcd_usb = UsbVersion::Two;
    let mut builder = get_usb_builder(
        peri.USB_OTG_FS,
        peri.PA12,
        peri.PA11,
        &mut ep_out_buffer,
        usb::Config::default(),
        builder_config,
        &mut config_descriptor,
        &mut [], // USB 2.0 does not require BOS descriptors
        &mut [], // Non vendor-specific devices/interfaces do not require MS OS descriptors
        &mut control_buf,
    );
    let usb_hid = Hid::new(&mut builder, HIDReports::desc(), &mut state);
    let mut main_loop = MainLoop { epd, hid: usb_hid };
    let main_fut = main_loop.run();
    let mut usb_device = builder.build();
    let usb_fut = usb_device.run();
    info!("Initialized USB HID device");
    join(main_fut, usb_fut).await;
 }
@@ -0,0 +1,52 @@
 use defmt_rtt as _;
 use embassy_executor::task;
 use embassy_stm32::{
    Peri,
    peripherals::USB_OTG_FS,
    usb::{self, DmPin, DpPin},
 };
 use embassy_usb::{UsbVersion, class::midi::MidiClass};
 use panic_probe as _;
 use static_cell::StaticCell;
 use crate::{Irqs, uid};
 pub type UsbDriver = usb::Driver<'static, USB_OTG_FS>;
 pub type UsbBuilder = embassy_usb::Builder<'static, UsbDriver>;
 pub type UsbMidi = MidiClass<'static, UsbDriver>;
 pub fn make_usb_builder(
    peri: Peri<'static, USB_OTG_FS>,
    dp: Peri<'static, impl DpPin<USB_OTG_FS>>,
    dm: Peri<'static, impl DmPin<USB_OTG_FS>>,
 ) -> UsbBuilder {
    let ep_out_buffer = static_ref!([u8; 4096] = [0; 4096]);
    let config_descriptor = static_ref!([u8; 256] = [0; 256]);
    let control_buf = static_ref!([u8; 256] = [0; 256]);
    let mut config = embassy_usb::Config::new(0x1209, 0xc9c9);
    config.manufacturer = Some("Project Daylily");
    config.product = Some("Inkclip BW");
    config.serial_number = Some(uid::uid_base64());
    config.bcd_usb = UsbVersion::Two;
    let usb_driver = usb::Driver::new_fs(peri, Irqs, dp, dm, ep_out_buffer, usb::Config::default());
    embassy_usb::Builder::new(
        usb_driver,
        config,
        config_descriptor,
        &mut [],
        &mut [],
        control_buf,
    )
 }
 pub fn make_midi_class(builder: &mut UsbBuilder) -> UsbMidi {
    UsbMidi::new(builder, 1, 1, 64)
 }
 #[task]
 pub async fn usb_task(builder: UsbBuilder) -> ! {
    let mut device = builder.build();
    device.run().await;
 }
@@ -0,0 +1,51 @@
 // 7-in-8 encoding. Each 7 bytes can be encoded into 8 bytes with all-0 MSB's. This is useful
 // for sending data over exotic protocols like MIDI SysEx.
 // Decode in-place, returning the decoded slice.
 pub fn decode_7in8(payload: &mut [u8]) -> &mut [u8] {
    let mut decoded_len = 0;
    for stride in 0..payload.len().div_ceil(8) {
        // Most significant bits of a 7-in-8 group
        let msbs = payload[8 * stride];
        for stroll in 1..8 {
            let in_ix = 8 * stride + stroll;
            if in_ix >= payload.len() {
                break;
            }
            payload[decoded_len] =
                (payload[in_ix] & 0b01111111) | ((msbs << (8 - stroll)) & 0b10000000);
            decoded_len += 1;
        }
    }
    &mut payload[..decoded_len]
 }
 // Encode into provided output buffer, returning the length of the output, or None if the buffer is too small.
 pub fn encode_7in8<'a>(payload: &[u8], output: &'a mut [u8]) -> Option<usize> {
    let mut encoded_len = 0;
    for stride in 0..payload.len().div_ceil(7) {
        let msbs_ix = encoded_len;
        if encoded_len >= output.len() {
            return None;
        }
        output[msbs_ix] = 0;
        encoded_len += 1;
        for stroll in 1..8 {
            let in_ix = 7 * stride + stroll - 1;
            if in_ix >= payload.len() {
                break;
            }
            if encoded_len >= output.len() {
                return None;
            }
            output[msbs_ix] |= (payload[in_ix] & 0b10000000) >> (8 - stroll);
            output[encoded_len] = payload[in_ix] & 0b01111111;
            encoded_len += 1;
        }
    }
    Some(encoded_len)
 }
@@ -0,0 +1,141 @@
 use defmt::{error, warn};
 pub struct SysExParser<const N: usize> {
    buf: [u8; N],
    len: usize,
 }
 impl<const N: usize> SysExParser<N> {
    pub fn new() -> Self {
        SysExParser {
            buf: [0u8; N],
            len: 0,
        }
    }
    pub fn feed(&mut self, packet: &[u8]) -> Option<&mut [u8]> {
        if packet.len() != 4 {
            error!(
                "Got a UDB MIDI packet of length {} != 4; dropping",
                packet.len()
            );
            return None;
        }
        match packet[0] & 0x0f {
            0x04 => self.extend_buf(&packet[1..]),
            0x05 => self.extend_buf_fin(&packet[1..2]),
            0x06 => self.extend_buf_fin(&packet[1..3]),
            0x07 => self.extend_buf_fin(&packet[1..4]),
            _ => self.reset(),
        }
    }
    fn extend_buf(&mut self, data: &[u8]) -> Option<&mut [u8]> {
        let new_len = self.len + data.len();
        if new_len > N {
            warn!("USB MIDI parsing overflowed buffer! Discarding partially parsed payload.");
            self.len = 0;
            return None;
        }
        self.buf[self.len..new_len].copy_from_slice(data);
        self.len = new_len;
        None
    }
    fn extend_buf_fin(&mut self, data: &[u8]) -> Option<&mut [u8]> {
        let new_len = self.len + data.len();
        if new_len > N {
            warn!("USB MIDI parsing overflowed buffer! Discarding partially parsed payload.");
            self.len = 0;
            return None;
        }
        self.buf[self.len..new_len].copy_from_slice(data);
        self.len = new_len;
        let result = &mut self.buf[..self.len];
        self.len = 0;
        Some(result)
    }
    fn reset(&mut self) -> Option<&mut [u8]> {
        self.len = 0;
        None
    }
 }
 pub struct SysExEncoder<const N: usize> {
    buf: [u8; N],
    len: usize,
 }
 impl<const N: usize> SysExEncoder<N> {
    pub fn new() -> Self {
        SysExEncoder {
            buf: [0u8; N],
            len: 0,
        }
    }
    fn clear(&mut self) {
        self.len = 0;
    }
    fn feed(&mut self, data: &[u8; 3]) -> bool {
        if self.len + 4 > N {
            error!("Encoding more would overflow the buffer");
            return false;
        }
        self.buf[self.len] = 0x04;
        self.buf[self.len + 1] = data[0];
        self.buf[self.len + 2] = data[1];
        self.buf[self.len + 3] = data[2];
        self.len += 4;
        true
    }
    fn feed_fin(&mut self, n: u8, data: &[u8; 3]) -> Option<&[u8]> {
        if n == 0 || n > 3 {
            error!("Inconsistent number of bytes");
            return None;
        }
        if self.len + 4 > N {
            error!("Encoding more would overflow the buffer");
            return None;
        }
        self.buf[self.len] = 0x04 + n;
        self.buf[self.len + 1] = data[0];
        self.buf[self.len + 2] = data[1];
        self.buf[self.len + 3] = data[2];
        self.len += 4;
        Some(&self.buf[..self.len])
    }
    pub fn encode(&mut self, data: &[u8]) -> Option<&[u8]> {
        self.clear();
        if data.len() == 0 {
            return self.feed_fin(2, &[0xf0, 0xf7, 0x00]);
        }
        if data.len() == 1 {
            return self.feed_fin(3, &[0xf0, data[0], 0xf7]);
        }
        self.feed(&[0xf0, data[0], data[1]]);
        for chunk in data[2..].chunks(3) {
            match chunk.len() {
                3 => {
                    if !self.feed(&[chunk[0], chunk[1], chunk[2]]) {
                        return None;
                    }
                }
                2 => return self.feed_fin(3, &[chunk[0], chunk[1], 0xf7]),
                1 => return self.feed_fin(2, &[chunk[0], 0xf7, 0x00]),
                _ => unreachable!(),
            }
        }
        self.feed_fin(1, &[0xf7, 0x00, 0x00])
    }
 }
@@ -6,7 +6,7 @@ pub fn uid_base64() -> &'static str {
 }
 #[allow(static_mut_refs)]
-pub fn uid_base64_bytes() -> &'static [u8] {
+pub fn uid_base64_bytes() -> &'static [u8; 16] {
    static mut UID_BASE64: [u8; 16] = [0; 16];
    static mut LOADED: bool = false;
    critical_section::with(|_| unsafe {