From 47812ef586b0a1fa7e6b3b1fe75140e6b20e9161 Mon Sep 17 00:00:00 2001
From: Per <Per Lindgren>
Date: Thu, 4 Jan 2018 17:14:05 +0100
Subject: [PATCH] added GPIO
---
.vscode/launch.json | 18 +++++++++++++
.vscode/tasks.json | 14 +++++++++-
Cargo.toml | 4 +++
examples/gpio.rs | 64 +++++++++++++++++++++++++++++++++++++++++++++
examples/loop.rs | 5 +---
5 files changed, 100 insertions(+), 5 deletions(-)
create mode 100644 examples/gpio.rs
diff --git a/.vscode/launch.json b/.vscode/launch.json
index d3c2e2a..8227339 100644
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -58,5 +58,23 @@
],
"cwd": "${workspaceRoot}"
},
+ {
+ "type": "gdb",
+ "request": "attach",
+ "name": "gpio",
+ "gdbpath": "/usr/bin/arm-none-eabi-gdb",
+ "executable": "./target/thumbv7em-none-eabihf/debug/examples/gpio",
+ "target": ":3333",
+ "remote": true,
+ "autorun": [
+ "monitor reset init",
+ "monitor arm semihosting enable",
+ "monitor tpiu config internal /tmp/itm.log uart off 64000000",
+ "monitor itm port 0 on",
+ "load",
+ "monitor reset init"
+ ],
+ "cwd": "${workspaceRoot}"
+ },
]
}
\ No newline at end of file
diff --git a/.vscode/tasks.json b/.vscode/tasks.json
index c825d3b..d2d5a46 100644
--- a/.vscode/tasks.json
+++ b/.vscode/tasks.json
@@ -30,7 +30,19 @@
{
"type": "shell",
"label": "xargo build --example loop",
- "command": "xargo build --example loop ",
+ "command": "xargo build --example loop",
+ "problemMatcher": [
+ "$rustc"
+ ],
+ "group": {
+ "kind": "build",
+ "isDefault": true
+ }
+ },
+ {
+ "type": "shell",
+ "label": "xargo build --example gpio",
+ "command": "xargo build --example gpio",
"problemMatcher": [
"$rustc"
],
diff --git a/Cargo.toml b/Cargo.toml
index c0f4057..22657d4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -30,6 +30,10 @@ git = "https://gitlab.henriktjader.com/pln/STM32F40x.git"
features = ["rt"]
version = "0.1.0"
+[dependencies.f4]
+git = "https://github.com/jsjolund/f4"
+version = "0.1.0"
+
[features]
wcet_bkpt = []
wcet_nop = []
diff --git a/examples/gpio.rs b/examples/gpio.rs
new file mode 100644
index 0000000..eb398dc
--- /dev/null
+++ b/examples/gpio.rs
@@ -0,0 +1,64 @@
+//! Simple access to gpio
+#![deny(unsafe_code)]
+#![feature(proc_macro)]
+#![no_std]
+
+extern crate cortex_m;
+extern crate cortex_m_rtfm as rtfm;
+extern crate stm32f40x;
+
+use rtfm::app;
+
+app! {
+ device: stm32f40x,
+}
+
+fn wait(i: u32) {
+ for _ in 0..i {
+ cortex_m::asm::nop(); // no operation (cannot be optimized out)
+ }
+}
+
+// see the Reference Manual RM0368 (www.st.com/resource/en/reference_manual/dm00096844.pdf)
+// rcc, chapter 6
+// gpio, chapter 8
+
+fn init(p: init::Peripherals) {
+ // power on GPIOA, RM0368 6.3.11
+ p.RCC.ahb1enr.modify(|_, w| w.gpioaen().set_bit());
+
+ // configure PA5 as output, RM0368 8.4.1
+ p.GPIOA.moder.modify(|_, w| w.moder5().bits(1));
+
+ // loop {
+ // // set PA5 high, RM0368 8.4.6
+ // p.GPIOA.odr.modify(|_, w| w.odr5().bit(true));
+ // wait(10_000);
+
+ // // set PA5 low, RM0368 8.4.6
+ // p.GPIOA.odr.modify(|_, w| w.odr5().bit(false));
+ // wait(10_000);
+ // }
+
+ // rewrite the above code to have the GPIO as output
+ // and alter the data output through the BSRR register
+ // this is more efficient as the read register (in modify)
+ // is not needed.
+
+ loop {
+ // set PA5 high, RM0368 8.4.7
+ p.GPIOA.bsrr.write(|w| w.bs5().set_bit());
+ wait(10_000);
+
+ // set PA5 low, RM0368 8.4.7
+ p.GPIOA.bsrr.write(|w| w.br5().set_bit());
+ wait(10_000);
+ }
+}
+
+#[inline(never)]
+fn idle() -> ! {
+ loop {
+ rtfm::wfi();
+ }
+}
diff --git a/examples/loop.rs b/examples/loop.rs
index c98cd2d..30ea0f4 100644
--- a/examples/loop.rs
+++ b/examples/loop.rs
@@ -1,7 +1,4 @@
-//! Nesting claims and how the preemption threshold works
-//!
-//! If you run this program you'll hit the breakpoints as indicated by the
-//! letters in the comments: A, then B, then C, etc.
+//! Simple loop to calculate the sum of integers 0..10
#![deny(unsafe_code)]
#![feature(proc_macro)]
#![no_std]
--
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