3 files changed, 13 insertions, 0 deletions
diff --git a/Cargo.lock b/Cargo.lock
index bb5177b..76dc8ef 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -80,6 +80,7 @@ dependencies = [
  "serde 1.0.88 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde-big-array 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "ssmarshal 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "static_assertions 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "stm32f103xx-usb 0.1.0 (git+https://github.com/mvirkkunen/stm32f103xx-usb?rev=57d23751367461bec5f39322727bdd65e5c2aa30)",
  "stm32f1xx-hal 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "usb-device 0.2.0 (git+https://github.com/mvirkkunen/usb-device?rev=e58e30f3b9c9bf4aab00ea039d129b964a3fd2d3)",
@@ -190,6 +191,11 @@ dependencies = [
 ]
 
 [[package]]
+name = "static_assertions"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "stm32f1"
 version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -288,6 +294,7 @@ dependencies = [
 "checksum serde-big-array 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "dbd629249ae3007dac9632aa92334c5ba9c8a4dbe0a6263e546121dd1c57394a"
 "checksum serde_derive 1.0.88 (registry+https://github.com/rust-lang/crates.io-index)" = "beed18e6f5175aef3ba670e57c60ef3b1b74d250d962a26604bff4c80e970dd4"
 "checksum ssmarshal 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "f3e6ad23b128192ed337dfa4f1b8099ced0c2bf30d61e551b65fda5916dbb850"
+"checksum static_assertions 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "389ce475f424f267dbed6479cbd8f126c5e1afb053b0acdaa019c74305fc65d1"
 "checksum stm32f1 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "48763f6f093674476399efbd8d2e52349dc32c3bbf57657234cbb15d309cd8a3"
 "checksum stm32f103xx-usb 0.1.0 (git+https://github.com/mvirkkunen/stm32f103xx-usb?rev=57d23751367461bec5f39322727bdd65e5c2aa30)" = "<none>"
 "checksum stm32f1xx-hal 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "f410543fc282d51e181e3cf5c8adff303d9e5ae8b9eb731e6a07f58a4cec4265"
diff --git a/Cargo.toml b/Cargo.toml
index b5f2c65..0d773d8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,6 +15,7 @@ cortex-m-rt = "0.6.7"
 embedded-hal = "0.2.2"
 panic-halt = "0.2.0"
 serde-big-array = "0.1.4"
+static_assertions = "0.3.1"
 stm32f103xx-usb = { git = "https://github.com/mvirkkunen/stm32f103xx-usb", rev = "57d23751367461bec5f39322727bdd65e5c2aa30" }
 usb-device = { git = "https://github.com/mvirkkunen/usb-device", rev = "e58e30f3b9c9bf4aab00ea039d129b964a3fd2d3" }
 
diff --git a/src/device.rs b/src/device.rs
index b25cfb7..8f6f6ef 100644
--- a/src/device.rs
+++ b/src/device.rs
@@ -3,6 +3,7 @@
 
 use serde::{Deserialize, Serialize};
 use serde_big_array::big_array;
+use static_assertions::assert_eq_size;
 use usb_device::bus::{UsbBus, UsbBusAllocator};
 use usb_device::device::{UsbDevice, UsbDeviceBuilder, UsbVidPid};
 
@@ -65,6 +66,8 @@ struct Request {
     pub crc: u32,
 }
 
+assert_eq_size!(request; [u8; REPORT_LEN], Request);
+
 #[derive(Serialize)]
 struct Response {
     pub device_status: DeviceStatus,
@@ -76,6 +79,8 @@ struct Response {
     pub crc: u32,
 }
 
+assert_eq_size!(response; [u8; REPORT_LEN], Response);
+
 impl Response {
     fn new(device_status: DeviceStatus, command_id: u8, last_crc: u32) -> Response {
         Response {