working with 'Invalid Memory Access' scenarios in Rust Core for Embedded System
I'm getting frustrated with I'm working on an embedded system project using Rust with the 'embedded-hal' and 'embedded-graphics' crates. I'm trying to draw a simple shape on an OLED display, but I keep running into an 'Invalid Memory Access' behavior when I attempt to write to the framebuffer. My setup uses the 'cortex-m-rt' crate version 0.7.0 and 'cortex-m' version 0.7.2. Here's the relevant snippet of my code: ```rust use embedded_graphics::prelude::*; use embedded_graphics::primitives::Rectangle; use embedded_hal::blocking::delay::Delay; fn draw_rectangle<D: Delay>(display: &mut impl DrawTarget, delay: &mut D) { let rect = Rectangle::new(Point::new(10, 10), Size::new(50, 30)).into_styled( PrimitiveStyle::with_fill(Color::WHITE), ); rect.draw(display).unwrap(); } ``` I've confirmed that my display is initialized correctly, and I'm calling `draw_rectangle` in a loop. However, the behavior occurs right after the first call to `draw`, and I get a 'core: undefined instruction' panic. I've also checked the stack size and increased it in my `Cargo.toml`: ```toml [profile.release] opt-level = 3 lto = true panic = "abort" stack-size = 0x800 ``` Despite this, I'm still working with the question. I suspect it might be related to how I'm handling the display's framebuffer or perhaps something in the way I'm using the HAL. I would appreciate any insights on why this 'Invalid Memory Access' behavior might be occurring and how to resolve it. Are there best practices for managing memory in embedded Rust applications like this one? Any ideas what could be causing this? Is there a simpler solution I'm overlooking?