Add stm32h7-exti driver for binding gpio changes to interrupts

app/demo-stm32h7-nucleo/app-h743.toml

@@ -30,6 +30,16 @@ uses = ["rcc", "gpios1", "gpios2", "gpios3"]
 start = true
 task-slots = ["jefe"]
 
+[tasks.exti_driver]
+name = "drv-stm32h7-exti-server"
+features = ["h743"]
+priority = 2
+max-sizes = {flash = 16384, ram = 4096}
+uses = ["exti", "syscfg"]
+start = true
+interrupts = {"exti.exti0" = 0b1, "exti.exti1" = 0b10, "exti.exti2" = 0b100, "exti.exti3" = 0b1000, "exti.exti4" = 0b1_0000, "exti.exti9_5" = 0b10_0000, "exti.exti15_10" = 0b100_0000}
+task-slots = ["sys"]
+
 [tasks.i2c_driver]
 name = "drv-stm32xx-i2c-server"
 features = ["h743"]

app/demo-stm32h7-nucleo/app-h753.toml

@@ -30,6 +30,16 @@ uses = ["rcc", "gpios1", "gpios2", "gpios3"]
 start = true
 task-slots = ["jefe"]
 
+[tasks.exti_driver]
+name = "drv-stm32h7-exti-server"
+features = ["h743"]
+priority = 2
+max-sizes = {flash = 16384, ram = 4096}
+uses = ["exti", "syscfg"]
+start = true
+interrupts = {"exti.exti0" = 0b1, "exti.exti1" = 0b10, "exti.exti2" = 0b100, "exti.exti3" = 0b1000, "exti.exti4" = 0b1_0000, "exti.exti9_5" = 0b10_0000, "exti.exti15_10" = 0b100_0000}
+task-slots = ["sys"]
+
 [tasks.i2c_driver]
 name = "drv-stm32xx-i2c-server"
 features = ["h753"]

chips/stm32h7/chip.toml

@@ -161,3 +161,11 @@ size = 0x8000
 address = 0x38000000
 size = 0x10000
 
+[exti]
+address = 0x58000000
+size = 1024
+interrupts = { exti0 = 6, exti1 = 7, exti2 = 8, exti3 = 9, exti4 = 10, exti9_5 = 23, exti15_10 = 40 }
+
+[syscfg]
+address = 0x58000400
+size = 1024

drv/stm32h7-exti-api/Cargo.toml

@@ -0,0 +1,28 @@
+[package]
+name = "drv-stm32h7-exti-api"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+bitflags = {workspace = true}
+num-traits = { workspace = true }
+zerocopy = { workspace = true }
+
+derive-idol-err = {path = "../../lib/derive-idol-err" }
+drv-stm32xx-gpio-common = {path = "../stm32xx-gpio-common"}
+userlib = {path = "../../sys/userlib"}
+
+[features]
+family-stm32h7 = ["drv-stm32xx-gpio-common/family-stm32h7"]
+h743 = ["drv-stm32xx-gpio-common/model-stm32h743"]
+#h747cm7 = ["drv-stm32xx-gpio-common/model-stm32h747cm7"]
+h753 = ["drv-stm32xx-gpio-common/model-stm32h753"]
+
+# This section is here to discourage RLS/rust-analyzer from doing test builds,
+# since test builds don't work for cross compilation.
+[lib]
+test = false
+bench = false
+
+[build-dependencies]
+idol = { workspace = true }

drv/stm32h7-exti-api/build.rs

@@ -0,0 +1,8 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    idol::client::build_client_stub("../../idl/stm32h7-exti.idol", "client_stub.rs")?;
+    Ok(())
+}

drv/stm32h7-exti-api/src/lib.rs

@@ -0,0 +1,41 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+//! Client API for the EXTI server
+
+#![no_std]
+
+use bitflags::bitflags;
+use derive_idol_err::IdolError;
+use drv_stm32xx_gpio_common::Port;
+use userlib::*;
+
+#[derive(Copy, Clone, Debug, FromPrimitive, Eq, PartialEq, IdolError)]
+#[repr(u32)]
+pub enum ExtiError {
+    AlreadyRegistered = 1,
+    InvalidIndex,
+    NotOwner,
+    NotRegistered,
+}
+
+bitflags! {
+
+    pub struct Edge: u8 {
+        const RISING  = 0b01;
+        const FALLING = 0b10;
+        const RISING_AND_FALLING = Self::RISING.bits | Self::FALLING.bits;
+    }
+
+}
+
+impl Exti {
+
+    pub fn enable_gpio(&self, port: Port, index: usize, edges: Edge, notification: u32) -> Result<(), ExtiError> {
+        self.enable_gpio_raw(port, index, edges.bits, notification)
+    }
+
+}
+
+include!(concat!(env!("OUT_DIR"), "/client_stub.rs"));

drv/stm32h7-exti-server/Cargo.toml

@@ -0,0 +1,32 @@
+[package]
+name = "drv-stm32h7-exti-server"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+idol-runtime = { workspace = true }
+num-traits = { workspace = true }
+stm32h7 = { workspace = true }
+zerocopy = { workspace = true }
+
+drv-stm32h7-exti = { path = "../stm32h7-exti" }
+drv-stm32h7-exti-api = { path = "../stm32h7-exti-api" }
+drv-stm32xx-gpio-common = {path = "../stm32xx-gpio-common"}
+ringbuf = { path = "../../lib/ringbuf" }
+userlib = { path = "../../sys/userlib", features = ["panic-messages"] }
+
+[build-dependencies]
+idol = { workspace = true }
+
+[features]
+family-stm32h7 = ["drv-stm32xx-gpio-common/family-stm32h7"]
+h743 = ["stm32h7/stm32h743", "drv-stm32h7-exti/h743", "drv-stm32xx-gpio-common/model-stm32h743"]
+#h747cm7 = ["stm32h7/stm32h747cm7", "drv-stm32h7-exti/h747cm7", "drv-stm32xx-gpio-common/model-stm32h747cm7"]
+h753 = ["stm32h7/stm32h753", "drv-stm32h7-exti/h753", "drv-stm32xx-gpio-common/model-stm32h753"]
+
+# This section is here to discourage RLS/rust-analyzer from doing test builds,
+# since test builds don't work for cross compilation.
+[[bin]]
+name = "drv-stm32h7-exti-server"
+test = false
+bench = false

drv/stm32h7-exti-server/build.rs

@@ -0,0 +1,12 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    idol::server::build_server_support(
+        "../../idl/stm32h7-exti.idol",
+        "server_stub.rs",
+        idol::server::ServerStyle::InOrder,
+    )?;
+    Ok(())
+}