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.vscode/launch.json
View file @ 8c4a3c34
......@@ -59,7 +59,7 @@
"preLaunchTask": "cargo build --example itm",
"executable": "./target/thumbv7em-none-eabihf/debug/examples/itm",
"configFiles": [
"interface/stlink.cfg",
"interface/stlink-v2-1.cfg",
"target/stm32f4x.cfg"
],
"postLaunchCommands": [
......@@ -89,7 +89,7 @@
"preLaunchTask": "cargo build --example panic",
"executable": "./target/thumbv7em-none-eabihf/debug/examples/panic",
"configFiles": [
"interface/stlink.cfg",
"interface/stlink-v2-1.cfg",
"target/stm32f4x.cfg"
],
"postLaunchCommands": [
......@@ -119,7 +119,7 @@
"preLaunchTask": "cargo build --example exception_itm --release",
"executable": "./target/thumbv7em-none-eabihf/release/examples/exception_itm",
"configFiles": [
"interface/stlink.cfg",
"interface/stlink-v2-1.cfg",
"target/stm32f4x.cfg"
],
"swoConfig": {
......@@ -145,7 +145,7 @@
"preLaunchTask": "cargo build --example exception_itm_raw",
"executable": "./target/thumbv7em-none-eabihf/debug/examples/exception_itm_raw",
"configFiles": [
"interface/stlink.cfg",
"interface/stlink-v2-1.cfg",
"target/stm32f4x.cfg"
],
"swoConfig": {
......@@ -302,7 +302,7 @@
"preLaunchTask": "cargo build --example bare0",
"executable": "./target/thumbv7em-none-eabihf/debug/examples/bare0",
"configFiles": [
"interface/stlink.cfg",
"interface/stlink-v2-1.cfg",
"target/stm32f4x.cfg"
],
"cwd": "${workspaceRoot}"
......@@ -331,7 +331,7 @@
]
},
"configFiles": [
"interface/stlink.cfg",
"interface/stlink-v2-1.cfg",
"target/stm32f4x.cfg"
],
"cwd": "${workspaceRoot}"
......@@ -360,7 +360,7 @@
]
},
"configFiles": [
"interface/stlink.cfg",
"interface/stlink-v2-1.cfg",
"target/stm32f4x.cfg"
],
"cwd": "${workspaceRoot}"
......@@ -389,7 +389,7 @@
]
},
"configFiles": [
"interface/stlink.cfg",
"interface/stlink-v2-1.cfg",
"target/stm32f4x.cfg"
],
"cwd": "${workspaceRoot}"
......@@ -418,7 +418,7 @@
]
},
"configFiles": [
"interface/stlink.cfg",
"interface/stlink-v2-1.cfg",
"target/stm32f4x.cfg"
],
"cwd": "${workspaceRoot}"
......@@ -434,7 +434,7 @@
"monitor arm semihosting enable"
],
"configFiles": [
"interface/stlink.cfg",
"interface/stlink-v2-1.cfg",
"target/stm32f4x.cfg"
],
"cwd": "${workspaceRoot}"
......@@ -450,7 +450,7 @@
"monitor arm semihosting enable"
],
"configFiles": [
"interface/stlink.cfg",
"interface/stlink-v2-1.cfg",
"target/stm32f4x.cfg"
],
"cwd": "${workspaceRoot}"
......@@ -466,7 +466,7 @@
"monitor arm semihosting enable"
],
"configFiles": [
"interface/stlink.cfg",
"interface/stlink-v2-1.cfg",
"target/stm32f4x.cfg"
],
"cwd": "${workspaceRoot}"
......@@ -482,7 +482,7 @@
"monitor arm semihosting enable"
],
"configFiles": [
"interface/stlink.cfg",
"interface/stlink-v2-1.cfg",
"target/stm32f4x.cfg"
],
"cwd": "${workspaceRoot}"
......@@ -495,7 +495,7 @@
"preLaunchTask": "cargo build --example bare6",
"executable": "./target/thumbv7em-none-eabihf/debug/examples/bare6",
"configFiles": [
"interface/stlink.cfg",
"interface/stlink-v2-1.cfg",
"target/stm32f4x.cfg"
],
"postLaunchCommands": [
......@@ -524,7 +524,7 @@
"preLaunchTask": "cargo build --example bare6",
"executable": "./target/thumbv7em-none-eabihf/debug/examples/bare6",
"configFiles": [
"interface/stlink.cfg",
"interface/stlink-v2-1.cfg",
"target/stm32f4x.cfg"
],
"postLaunchCommands": [
......@@ -585,7 +585,7 @@
"preLaunchTask": "cargo build --example bare7",
"executable": "./target/thumbv7em-none-eabihf/debug/examples/bare7",
"configFiles": [
"interface/stlink.cfg",
"interface/stlink-v2-1.cfg",
"target/stm32f4x.cfg"
],
"postLaunchCommands": [
......@@ -616,7 +616,7 @@
"executable": "./target/thumbv7em-none-eabihf/debug/examples/bare7",
// uses local config files
"configFiles": [
"interface/stlink.cfg",
"interface/stlink-v2-1.cfg",
"target/stm32f4x.cfg"
],
"postLaunchCommands": [
......@@ -646,7 +646,7 @@
"preLaunchTask": "cargo build --example bare8",
"executable": "./target/thumbv7em-none-eabihf/debug/examples/bare8",
"configFiles": [
"interface/stlink.cfg",
"interface/stlink-v2-1.cfg",
"target/stm32f4x.cfg"
],
"swoConfig": {
......@@ -673,7 +673,7 @@
"preLaunchTask": "cargo build --example bare9",
"executable": "./target/thumbv7em-none-eabihf/debug/examples/bare9",
"configFiles": [
"interface/stlink.cfg",
"interface/stlink-v2-1.cfg",
"target/stm32f4x.cfg"
],
"swoConfig": {
......@@ -700,7 +700,7 @@
"preLaunchTask": "cargo build --example bare9 --release",
"executable": "./target/thumbv7em-none-eabihf/release/examples/bare9",
"configFiles": [
"interface/stlink.cfg",
"interface/stlink-v2-1.cfg",
"target/stm32f4x.cfg"
],
"swoConfig": {
......@@ -727,7 +727,7 @@
"preLaunchTask": "cargo build --example bare10 --release",
"executable": "./target/thumbv7em-none-eabihf/release/examples/bare10",
"configFiles": [
"interface/stlink.cfg",
"interface/stlink-v2-1.cfg",
"target/stm32f4x.cfg"
],
"swoConfig": {
......@@ -759,7 +759,7 @@
"preLaunchTask": "cargo build --example bare10",
"executable": "./target/thumbv7em-none-eabihf/debug/examples/bare10",
"configFiles": [
"interface/stlink.cfg",
"interface/stlink-v2-1.cfg",
"target/stm32f4x.cfg"
],
"swoConfig": {
......@@ -791,7 +791,7 @@
"preLaunchTask": "cargo build --example marcus --release",
"executable": "./target/thumbv7em-none-eabihf/release/examples/marcus",
"configFiles": [
"interface/stlink.cfg",
"interface/stlink-v2-1.cfg",
"target/stm32f4x.cfg"
],
"swoConfig": {
......@@ -823,7 +823,7 @@
"preLaunchTask": "cargo build --example equivalence --release",
"executable": "./target/thumbv7em-none-eabihf/release/examples/equivalence",
"configFiles": [
"interface/stlink.cfg",
"interface/stlink-v2-1.cfg",
"target/stm32f4x.cfg"
],
"swoConfig": {
......
examples/bare0.rs
View file @ 8c4a3c34
......@@ -18,26 +18,43 @@ extern crate panic_halt;
// Minimal runtime / startup for Cortex-M microcontrollers
use cortex_m_rt::entry;
use core::cell::UnsafeCell;
struct U32 {
data: UnsafeCell<u32>,
}
// a constant (cannot be changed at run-time)
const X_INIT: u32 = 10;
const X_INIT: u32 = 0xffffffff;
// global mutabale variables (changed using unsafe code)
static mut X: u32 = X_INIT;
static mut Y: u32 = 0;
static X: U32 = U32 {
data: UnsafeCell::new(X_INIT),
};
static Y: U32 = U32 {
data: UnsafeCell::new(0),
};
unsafe impl Sync for U32 {}
#[entry]
fn main() -> ! {
// local mutabale variable (changed in safe code)
let mut x = unsafe { X };
let mut x = read_u32(&X);
loop {
x += 1; // <- place breakpoint here (3)
unsafe {
X += 1;
Y = X;
assert!(x == X && X == Y);
x = x.wrapping_add(1); // <- place breakpoint here (3)
write_u32(&X, read_u32(&X).wrapping_add(1) );
write_u32(&Y, read_u32(&X));
assert!(x == read_u32(&X) && read_u32(&X) == read_u32(&Y) );
}
}
fn read_u32(uint: &U32) -> u32 {
return unsafe{ *uint.data.get()};
}
fn write_u32(write_to: &U32, value: u32) {
unsafe{ *write_to.data.get() = value };
}
// 0. Compile/build the example in debug (dev) mode.
......@@ -48,25 +65,26 @@ fn main() -> ! {
// 1. Run the program in the debugger, let the program run for a while and
// then press pause. Look in the (Local -vscode) Variables view what do you find.
//
// ** your answer here **
// *** x: 962669 ***
//
// In the Expressions (WATCH -vscode) view add X and Y
// what do you find
//
// ** your answer here **
// *** Watch X and Y didn't work, added watch to 'bare0::X::h2583a8be644794f3' and 'bare0::Y::hef3986a5288bec08' to be able to read the variables
// X = 962669, Y = 962668 ***
//
// Step through one complete iteration of the loop
// and see how the (Local) Variables are updated
// can you foresee what will eventually happen?
//
// ** place your answer here **
// *** x is incremented. Eventually x will wrap. ***
//
// Commit your answers (bare0_1)
//
// 2. Alter the constant X_INIT so that `x += 1` directly causes `x` to wrap
// what happens when `x` wraps
//
// ** your answer here **
// ** We end up in the panic handler **
//
// Commit your answers (bare0_2)
//
......@@ -74,10 +92,10 @@ fn main() -> ! {
//
// Change (both) += opertions to use wrapping_add
// load and run the progam, what happens
// ** your answer here **
// ** x value wraps around u32 max 4294967295 and get value 0**
//
// Now continue exectution, what happens
// ** your answer here **
// ** X,Y and x is incremented and wraps around max **
//
// Commit your answers (bare0_3)
//
......@@ -86,7 +104,7 @@ fn main() -> ! {
//
// 4. Change the asserion to `assert!(x == X && X == Y + 1)`, what happens?
//
// ** place your answer here **
// ** The assert fails and we go into panic handler **
//
// Commit your answers (bare0_4)
//
......
openocd.cfg
View file @ 8c4a3c34
......@@ -3,6 +3,6 @@
# Depending on the hardware revision you got you'll have to pick ONE of these
# interfaces. At any time only one interface should be commented out.
source [find interface/stlink.cfg]
source [find interface/stlink-v2-1.cfg]
source [find target/stm32f4x.cfg]