Support embedded-io-async 0.7

This is the version implemented by the latest version of embassy-stm32
as well as some other not yet released crates in the embassy family.

Author: bjorn3

ci.sh

@@ -60,6 +60,11 @@ cargo check \
     --no-default-features \
     --features=embedded-io-async-0_6-server \
     --target thumbv7em-none-eabihf
+cargo check \
+    --manifest-path source/postcard-rpc/Cargo.toml \
+    --no-default-features \
+    --features=embedded-io-async-0_7-server \
+    --target thumbv7em-none-eabihf
 
 # USB gadget (OTG) server impl
 cargo check \

source/postcard-rpc/Cargo.toml

@@ -20,6 +20,7 @@ features = [
     "raw-nusb",
     "embassy-usb-0_5-server",
     "embedded-io-async-0_6-server",
+    "embedded-io-async-0_7-server",
     "_docs-fix",
     # TODO: What to do about the webusb feature? Can we do separate target builds?
 ]
@@ -152,6 +153,11 @@ package = "embedded-io-async"
 version = "0.6"
 optional = true
 
+[dependencies.embedded-io-async-0_7]
+package = "embedded-io-async"
+version = "0.7"
+optional = true
+
 [target.'cfg(target_os = "linux")'.dependencies.usb-gadget]
 package = "usb-gadget"
 version = "0.7"
@@ -239,6 +245,13 @@ embedded-io-async-0_6-server = [
     "dep:embedded-io-async-0_6",
     "cobs",
 ]
+embedded-io-async-0_7-server = [
+    "dep:embassy-sync-0_7",
+    "dep:static_cell",
+    "dep:embassy-executor",
+    "dep:embedded-io-async-0_7",
+    "cobs",
+]
 usb-gadget = [
     "dep:usb-gadget",
     "dep:bytes",

source/postcard-rpc/src/server/impls/embedded_io_async_v0_7.rs

@@ -9,7 +9,7 @@ use crate::{
 };
 use cobs::decode;
 use embassy_sync_0_7::{blocking_mutex::raw::RawMutex, mutex::Mutex};
-use embedded_io_async_0_6::{Read, Write};
+use embedded_io_async_0_7::{Read, Write};
 use postcard::{
     ser_flavors::{Flavor, Slice},
     Serializer,

source/postcard-rpc/src/server/impls/mod.rs

@@ -8,6 +8,9 @@ pub mod embassy_usb_v0_5;
 #[cfg(feature = "embedded-io-async-0_6-server")]
 pub mod embedded_io_async_v0_6;
 
+#[cfg(feature = "embedded-io-async-0_7-server")]
+pub mod embedded_io_async_v0_7;
+
 #[cfg(all(target_os = "linux", feature = "usb-gadget"))]
 pub mod usb_gadget;
 
@@ -17,6 +20,7 @@ pub mod test_channels;
 #[cfg(any(
     feature = "embassy-usb-0_5-server",
     feature = "embedded-io-async-0_6-server",
+    feature = "embedded-io-async-0_7-server",
 ))]
 pub(crate) mod embassy_shared {
     use crate::server::WireSpawn;