embassy-rs · brainstorm · Nov 27, 2025 · Nov 27, 2025 · Nov 27, 2025 · Nov 27, 2025
diff --git a/cyw43/CHANGELOG.md b/cyw43/CHANGELOG.md
@@ -12,6 +12,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Bump bt-hci to 0.6.0.
 - Add error handling to HCI transport implementation.
 - Reset WPA security on AP creation #4709
+- Upgrade heapless to 0.9, drop support for defmt-03 in favor of defmt (1.x).
+- Upgrade embedded-io-async to 0.7.x.
 
 ## 0.5.0 - 2025-08-28
 

diff --git a/cyw43/Cargo.toml b/cyw43/Cargo.toml
@@ -10,7 +10,7 @@ repository = "https://github.com/embassy-rs/embassy"
 documentation = "https://docs.embassy.dev/cyw43"
 
 [features]
-defmt = ["dep:defmt", "heapless/defmt-03", "embassy-time/defmt", "bt-hci?/defmt", "embedded-io-async?/defmt-03"]
+defmt = ["dep:defmt", "heapless/defmt", "embassy-time/defmt", "bt-hci?/defmt", "embedded-io-async?/defmt"]
 log = ["dep:log"]
 bluetooth = ["dep:bt-hci", "dep:embedded-io-async"]
 
@@ -32,10 +32,10 @@ futures = { version = "0.3.17", default-features = false, features = ["async-awa
 
 embedded-hal-1 = { package = "embedded-hal", version = "1.0" }
 num_enum = { version = "0.5.7", default-features = false }
-heapless = "0.8.0"
+heapless = "0.9"
 
 # Bluetooth deps
-embedded-io-async = { version = "0.6.0", optional = true }
+embedded-io-async = { version = "0.7", optional = true }
 bt-hci = { version = "0.6.0", optional = true }
 
 [package.metadata.embassy]

diff --git a/embassy-imxrt/CHANGELOG.md b/embassy-imxrt/CHANGELOG.md
@@ -9,3 +9,4 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## Unreleased - ReleaseDate
 
 - First release with changelog.
+- Upgrade heapless to 0.9
diff --git a/embassy-imxrt/Cargo.toml b/embassy-imxrt/Cargo.toml
@@ -85,8 +85,8 @@ cfg-if = "1.0.0"
 cortex-m-rt = ">=0.7.3,<0.8"
 cortex-m = "0.7.6"
 critical-section = "1.1"
-embedded-io = { version = "0.6.1" }
-embedded-io-async = { version = "0.6.1" }
+embedded-io = { version = "0.7"  }
+embedded-io-async = { version = "0.7" }
 fixed = "1.23.1"
 
 rand-core-06 = { package = "rand_core", version = "0.6" }

diff --git a/embassy-mspm0/CHANGELOG.md b/embassy-mspm0/CHANGELOG.md
@@ -19,4 +19,5 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - feat: Add i2c target implementation (#4605)
 - fix: group irq handlers must check for NO_INTR (#4785)
 - feat: Add read_reset_cause function
-- feat: Add module Mathacl & example for mspm0g3507 (#4897)
+- feat: Add module Mathacl & example for mspm0g3507 (#4897)
+- Upgrade embedded-io-async to 0.7.x.
diff --git a/embassy-mspm0/Cargo.toml b/embassy-mspm0/Cargo.toml
@@ -61,8 +61,8 @@ embedded-hal-02 = { package = "embedded-hal", version = "0.2.6", features = ["un
 embedded-hal = { version = "1.0" }
 embedded-hal-nb = { version = "1.0" }
 embedded-hal-async = { version = "1.0" }
-embedded-io = "0.6.1"
-embedded-io-async = "0.6.1"
+embedded-io = "0.7"
+embedded-io-async = "0.7"
 
 defmt = { version = "1.0.1", optional = true }
 fixed = "1.29"

diff --git a/embassy-mspm0/src/uart/buffered.rs b/embassy-mspm0/src/uart/buffered.rs
@@ -436,6 +436,10 @@ impl embedded_io_async::Write for BufferedUart<'_> {
     async fn write(&mut self, buf: &[u8]) -> Result<usize, Self::Error> {
         self.tx.write_inner(buf).await
     }
+
+    async fn flush(&mut self) -> Result<(), Self::Error> {
+        self.tx.flush_inner().await
+    }
 }
 
 impl embedded_io_async::Write for BufferedUartTx<'_> {

diff --git a/embassy-net-adin1110/CHANGELOG.md b/embassy-net-adin1110/CHANGELOG.md
@@ -11,3 +11,5 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## 0.3.1 - 2025-08-26
 
 - First release with changelog.
+- Upgrade heapless to 0.9, drop support for defmt-03 in favor of defmt (1.x).
+- Upgrade embedded-io-async to 0.7.x.
diff --git a/embassy-net-adin1110/Cargo.toml b/embassy-net-adin1110/Cargo.toml
@@ -10,7 +10,7 @@ repository = "https://github.com/embassy-rs/embassy"
 documentation = "https://docs.embassy.dev/embassy-net-adin1110"
 
 [dependencies]
-heapless = "0.8"
+heapless = "0.9"
 defmt = { version = "1.0.1", optional = true }
 log = { version = "0.4", default-features = false, optional = true }
 embedded-hal-1 = { package = "embedded-hal", version = "1.0" }
@@ -29,7 +29,7 @@ critical-section = { version = "1.1.2", features = ["std"] }
 futures-test = "0.3.28"
 
 [features]
-defmt = ["dep:defmt", "embedded-hal-1/defmt-03"]
+defmt = ["dep:defmt", "embedded-hal-1/defmt"]
 log = ["dep:log"]
 
 [package.metadata.embassy_docs]

diff --git a/embassy-net-esp-hosted/CHANGELOG.md b/embassy-net-esp-hosted/CHANGELOG.md
@@ -11,6 +11,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Add an `Interface` trait to allow using other interface transports.
 - Switch to `micropb` for protobuf.
 - Update protos to latest `esp-hosted-fg`.
+- Upgrade heapless to 0.9, drop support for defmt-03 in favor of defmt (1.x).
+- Upgrade embedded-io-async to 0.7.x.
 
 ## 0.2.1 - 2025-08-26
 

diff --git a/embassy-net-esp-hosted/Cargo.toml b/embassy-net-esp-hosted/Cargo.toml
@@ -10,7 +10,7 @@ repository = "https://github.com/embassy-rs/embassy"
 documentation = "https://docs.embassy.dev/embassy-net-esp-hosted"
 
 [features]
-defmt = ["dep:defmt", "heapless/defmt-03"]
+defmt = ["dep:defmt", "heapless/defmt"]
 log = ["dep:log"]
 
 [dependencies]
@@ -26,7 +26,7 @@ embedded-hal = { version = "1.0" }
 embedded-hal-async = { version = "1.0" }
 
 micropb = { version = "0.4.0", default-features = false, features = ["container-heapless", "encode", "decode"] }
-heapless = "0.8"
+heapless = "0.9"
 
 [package.metadata.embassy_docs]
 src_base = "https://github.com/embassy-rs/embassy/blob/embassy-net-esp-hosted-v$VERSION/embassy-net-esp-hosted/src/"

diff --git a/embassy-net-nrf91/CHANGELOG.md b/embassy-net-nrf91/CHANGELOG.md
@@ -9,6 +9,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## Unreleased - ReleaseDate
 
 - changed: updated to nrf-pac with nrf52/nrf53/nrf91 register layout more similar to nrf54
+- Upgrade heapless to 0.9, drop support for defmt-03 in favor of defmt (1.x).
+- Upgrade embedded-io(-async) to 0.7.x.
 
 ## 0.1.1 - 2025-08-14
 

diff --git a/embassy-net-nrf91/Cargo.toml b/embassy-net-nrf91/Cargo.toml
@@ -11,7 +11,7 @@ documentation = "https://docs.embassy.dev/embassy-net-nrf91"
 publish = false
 
 [features]
-defmt = ["dep:defmt", "heapless/defmt-03"]
+defmt = ["dep:defmt", "heapless/defmt"]
 log = ["dep:log"]
 
 [dependencies]
@@ -26,8 +26,8 @@ embassy-sync = { version = "0.7.2", path = "../embassy-sync" }
 embassy-futures = { version = "0.1.2", path = "../embassy-futures" }
 embassy-net-driver-channel = { version = "0.3.2", path = "../embassy-net-driver-channel" }
 
-heapless = "0.8"
-embedded-io = "0.6.1"
+heapless = "0.9"
+embedded-io = "0.7"
 at-commands = "0.5.4"
 
 [package.metadata.embassy]

diff --git a/embassy-net-ppp/CHANGELOG.md b/embassy-net-ppp/CHANGELOG.md
@@ -14,6 +14,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Update `ppproto` to v0.2.
 - Use `core::net` IP types for IPv4 configuration instead of a custom type.
+- Upgrade heapless to 0.9, drop support for defmt-03 in favor of defmt (1.x).
+- Upgrade embedded-io-async to 0.7.x.
 
 ## 0.1.0 - 2024-01-12
 

diff --git a/embassy-net-ppp/Cargo.toml b/embassy-net-ppp/Cargo.toml
@@ -17,7 +17,7 @@ log = ["dep:log", "ppproto/log"]
 defmt = { version = "1.0.1", optional = true }
 log = { version = "0.4.14", optional = true }
 
-embedded-io-async = { version = "0.6.1" }
+embedded-io-async = { version = "0.7" }
 embassy-net-driver-channel = { version = "0.3.2", path = "../embassy-net-driver-channel" }
 embassy-futures = { version = "0.1.2", path = "../embassy-futures" }
 ppproto = { version = "0.2.1"}

diff --git a/embassy-net/CHANGELOG.md b/embassy-net/CHANGELOG.md
@@ -9,6 +9,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## Unreleased - ReleaseDate
 
 - tcp: Add `set_nagle_enabled()` to control TcpSocket nagle algorithm.
+- Upgrade heapless to 0.9, drop support for defmt-03 in favor of defmt (1.x).
+- Upgrade embedded-io-async to 0.7.x.
 
 ## 0.7.1 - 2025-08-26
 

diff --git a/embassy-net/Cargo.toml b/embassy-net/Cargo.toml
@@ -52,7 +52,7 @@ features = ["defmt", "tcp", "udp", "raw", "dns", "icmp", "dhcpv4", "proto-ipv6",
 
 [features]
 ## Enable defmt
-defmt = ["dep:defmt", "smoltcp/defmt", "embassy-net-driver/defmt", "embassy-time/defmt", "heapless/defmt-03", "defmt?/ip_in_core"]
+defmt = ["dep:defmt", "smoltcp/defmt", "embassy-net-driver/defmt", "embassy-time/defmt", "heapless/defmt", "defmt?/ip_in_core"]
 ## Enable log
 log = ["dep:log"]
 
@@ -109,9 +109,9 @@ smoltcp = { version = "0.12.0", default-features = false, features = [
 embassy-net-driver = { version = "0.2.0", path = "../embassy-net-driver" }
 embassy-time = { version = "0.5.0", path = "../embassy-time" }
 embassy-sync = { version = "0.7.2", path = "../embassy-sync" }
-embedded-io-async = { version = "0.6.1" }
+embedded-io-async = { version = "0.7" }
 
 managed = { version = "0.8.0", default-features = false, features = [ "map" ] }
-heapless = { version = "0.8", default-features = false }
+heapless = { version = "0.9", default-features = false }
 embedded-nal-async = "0.8.0"
 document-features = "0.2.7"
diff --git a/embassy-nrf/CHANGELOG.md b/embassy-nrf/CHANGELOG.md
@@ -28,6 +28,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - bugfix: use correct flash size for nRF54l
 - changed: add workaround for anomaly 66 on nrf52
 - added: expose PPI events available on SPIS peripheral
+- changed: Upgrade heapless to 0.9, drop support for defmt-03 in favor of defmt (1.x).
+- changed: Upgrade embedded-io-async to 0.7.x.
 - added: add basic GRTC time driver support for nRF54L
 
 ## 0.8.0 - 2025-09-30

diff --git a/embassy-nrf/Cargo.toml b/embassy-nrf/Cargo.toml
@@ -196,8 +196,8 @@ embassy-futures = { version = "0.1.2", path = "../embassy-futures", optional = t
 embedded-hal-02 = { package = "embedded-hal", version = "0.2.6", features = ["unproven"] }
 embedded-hal-1 = { package = "embedded-hal", version = "1.0" }
 embedded-hal-async = { version = "1.0" }
-embedded-io = { version = "0.6.0" }
-embedded-io-async = { version = "0.6.1" }
+embedded-io = { version = "0.7"  }
+embedded-io-async = { version = "0.7" }
 
 rand-core-06 = { package = "rand_core", version = "0.6" }
 rand-core-09 = { package = "rand_core", version = "0.9" }

diff --git a/embassy-nxp/CHANGELOG.md b/embassy-nxp/CHANGELOG.md
@@ -7,6 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 <!-- next-header -->
 ## Unreleased - ReleaseDate
+- Upgrade embedded-io to 0.7.x.
 - Codegen using `nxp-pac` metadata
 - LPC55: PWM simple
 - LPC55: Move ALT definitions for USART to TX/RX pin impls. 

diff --git a/embassy-nxp/Cargo.toml b/embassy-nxp/Cargo.toml
@@ -35,7 +35,7 @@ log = { version = "0.4.27", optional = true }
 embassy-time = { version = "0.5.0", path = "../embassy-time", optional = true }
 embassy-time-driver = { version = "0.2.1", path = "../embassy-time-driver", optional = true }
 embassy-time-queue-utils = { version = "0.3.0", path = "../embassy-time-queue-utils", optional = true }
-embedded-io = "0.6.1"
+embedded-io = "0.7"
 embedded-hal-02 = { package = "embedded-hal", version = "0.2.6", features = ["unproven"] }
 ## Chip dependencies
 nxp-pac = { version = "0.1.0", optional = true, git = "https://github.com/i509VCB/nxp-pac", rev = "af5122e1cbe1483833c5d2e5af96b26a34ed5d62"}

diff --git a/embassy-rp/CHANGELOG.md b/embassy-rp/CHANGELOG.md
@@ -20,6 +20,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Add PIO::Ws2812 color order support
 - Add TX-only, no SCK SPI support
 - Remove atomic-polyfill with critical-section instead ([#4948](https://github.com/embassy-rs/embassy/pull/4948))
+- Upgrade heapless to 0.9, drop support for defmt-03 in favor of defmt (1.x).
+- Upgrade embedded-io-async to 0.7.x.
 
 ## 0.8.0 - 2025-08-26
 

diff --git a/embassy-rp/Cargo.toml b/embassy-rp/Cargo.toml
@@ -167,8 +167,8 @@ cortex-m-rt = ">=0.6.15,<0.8"
 cortex-m = "0.7.6"
 critical-section = "1.2.0"
 chrono = { version = "0.4", default-features = false, optional = true }
-embedded-io = { version = "0.6.1" }
-embedded-io-async = { version = "0.6.1" }
+embedded-io = { version = "0.7"  }
+embedded-io-async = { version = "0.7" }
 embedded-storage = { version = "0.3" }
 embedded-storage-async = { version = "0.4.1" }
 fixed = "1.28.0"

diff --git a/embassy-stm32-wpan/CHANGELOG.md b/embassy-stm32-wpan/CHANGELOG.md
@@ -11,3 +11,4 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - wpan: restructure hil and test wpan mac
 - restructure to allow embassy net driver to work.
 - First release with changelog.
+- Upgrade heapless to 0.9
diff --git a/embassy-stm32-wpan/Cargo.toml b/embassy-stm32-wpan/Cargo.toml
@@ -39,7 +39,7 @@ defmt = { version = "1.0.1", optional = true }
 log = { version = "0.4.17", optional = true }
 
 cortex-m = "0.7.6"
-heapless = "0.8"
+heapless = "0.9"
 aligned = "0.4.1"
 critical-section = "1.1"
 

diff --git a/embassy-stm32/CHANGELOG.md b/embassy-stm32/CHANGELOG.md
@@ -84,6 +84,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - removal: ExtiInput no longer accepts AnyPin/AnyChannel; AnyChannel removed entirely
 - fix: build script ensures EXTI2_TSC is listed as the IRQ of EXTI2 even if the PAC doesn't
 - feat: stm32/lcd: added implementation
+- Upgrade heapless to 0.9, drop support for defmt-03 in favor of defmt (1.x).
+- Upgrade embedded-io-async to 0.7.x.
 
 ## 0.4.0 - 2025-08-26
 

diff --git a/embassy-stm32/Cargo.toml b/embassy-stm32/Cargo.toml
@@ -184,8 +184,8 @@ vcell = "0.1.3"
 nb = "1.0.0"
 stm32-fmc = "0.4.0"
 cfg-if = "1.0.0"
-embedded-io = { version = "0.6.0" }
-embedded-io-async = { version = "0.6.1" }
+embedded-io = { version = "0.7"  }
+embedded-io-async = { version = "0.7" }
 chrono = { version = "^0.4", default-features = false, optional = true }
 bit_field = "0.10.2"
 trait-set = "0.3.0"
@@ -228,7 +228,7 @@ defmt = [
     "embassy-sync/defmt",
     "embassy-embedded-hal/defmt",
     "embassy-hal-internal/defmt",
-    "embedded-io-async/defmt-03",
+    "embedded-io-async/defmt",
     "embassy-usb-driver/defmt",
     "embassy-net-driver/defmt",
     "embassy-time?/defmt",

diff --git a/embassy-sync/CHANGELOG.md b/embassy-sync/CHANGELOG.md
@@ -9,6 +9,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## Unreleased - ReleaseDate
 - Fix wakers getting dropped by `Signal::reset`
 - Remove `Sized` trait bound from `MutexGuard::map`
+- Upgrade heapless to 0.9, drop support for defmt-03 in favor of defmt (1.x).
+- Upgrade embedded-io-async to 0.7.x.
 
 ## 0.7.2 - 2025-08-26
 

diff --git a/embassy-sync/Cargo.toml b/embassy-sync/Cargo.toml
@@ -39,9 +39,9 @@ log = { version = "0.4.14", optional = true }
 futures-sink = { version = "0.3", default-features = false, features = [] }
 futures-core = { version = "0.3.31", default-features = false }
 critical-section = "1.1"
-heapless = "0.8"
+heapless = "0.9"
 cfg-if = "1.0.0"
-embedded-io-async = { version = "0.6.1" }
+embedded-io-async = { version = "0.7" }
 
 [dev-dependencies]
 futures-executor = { version = "0.3.17", features = [ "thread-pool" ] }

diff --git a/embassy-time-queue-utils/CHANGELOG.md b/embassy-time-queue-utils/CHANGELOG.md
@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 <!-- next-header -->
 ## Unreleased - ReleaseDate
+- Upgrade heapless to 0.9, drop support for defmt-03 in favor of defmt (1.x).
+- Upgrade embedded-io-async to 0.7.x.
 
 ## 0.3.0 - 2025-08-26
 

diff --git a/embassy-time-queue-utils/Cargo.toml b/embassy-time-queue-utils/Cargo.toml
@@ -21,7 +21,7 @@ categories = [
 links = "embassy-time-queue"
 
 [dependencies]
-heapless = "0.8"
+heapless = "0.9"
 embassy-executor-timer-queue = { version = "0.1", path = "../embassy-executor-timer-queue", features = ["timer-item-size-6-words"] }
 
 [features]

diff --git a/embassy-time/CHANGELOG.md b/embassy-time/CHANGELOG.md
@@ -10,6 +10,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Add as_nanos and from_nanos where missing
 - Added 375KHz tick rate support
+- Upgrade heapless to 0.9, drop support for defmt-03 in favor of defmt (1.x).
+- Upgrade embedded-io-async to 0.7.x.
 
 ## 0.5.0 - 2025-08-26
 

diff --git a/embassy-usb-driver/CHANGELOG.md b/embassy-usb-driver/CHANGELOG.md
@@ -9,6 +9,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## Unreleased - ReleaseDate
 
 - Add `EndpointOut::read_data()` and `EndpointIn::write_data()` provided methods.
+- Upgrade heapless to 0.9, drop support for defmt-03 in favor of defmt (1.x).
+- Upgrade embedded-io-async to 0.7.x.
 
 ## 0.2.0 - 2025-07-16
 

diff --git a/embassy-usb-driver/Cargo.toml b/embassy-usb-driver/Cargo.toml
@@ -19,7 +19,7 @@ target = "thumbv7em-none-eabi"
 features = ["defmt"]
 
 [dependencies]
-embedded-io-async = "0.6.1"
+embedded-io-async = "0.7"
 defmt = { version = "1", optional = true }
 
 [features]

diff --git a/embassy-usb/CHANGELOG.md b/embassy-usb/CHANGELOG.md
@@ -10,6 +10,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Add support for USB HID Boot Protocol Mode 
 - Bump usbd-hid from 0.8.1 to 0.9.0
+- Upgrade heapless to 0.9
+- Upgrade embedded-io-async to 0.7.x.
 
 ## 0.5.1 - 2025-08-26
 

diff --git a/embassy-usb/Cargo.toml b/embassy-usb/Cargo.toml
@@ -65,8 +65,8 @@ embassy-net-driver-channel = { version = "0.3.2", path = "../embassy-net-driver-
 
 defmt = { version = "1", optional = true }
 log = { version = "0.4.14", optional = true }
-heapless = "0.8"
-embedded-io-async = "0.6.1"
+heapless = "0.9"
+embedded-io-async = "0.7"
 
 # for HID
 usbd-hid = { version = "0.9.0", optional = true }

diff --git a/examples/mspm0g3507/Cargo.toml b/examples/mspm0g3507/Cargo.toml
@@ -18,7 +18,7 @@ defmt-rtt = "1.0.0"
 panic-probe = { version = "1.0.0", features = ["print-defmt"] }
 panic-semihosting = "0.6.0"
 
-embedded-io-async = "0.6.1"
+embedded-io-async = "0.7"
 
 [profile.release]
 debug = 2
Original file line number	Diff line number	Diff line change
Expand Up		@@ -9,3 +9,4 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
		## Unreleased - ReleaseDate

		- First release with changelog.
		- Upgrade heapless to 0.9