![]() ![]() Under both ecosystems, Espressif offers a variety of crates for different purposes. Consequently, no- std development typically involves the usage of lower-performance resource-constrained controllers.Įspressif provides support (an ecosystem) for both std and no-std development. The no_std approach allows for a smaller memory footprint, direct hardware interaction, predictable real-time performance, and greater customization. On the other hand, one might opt for the Core Library ( no_std) when dealing with embedded systems with limited memory resources, needing direct hardware control, facing real-time constraints, or having custom requirements. Also std development typically involves the usage of higher-performance higher-resource controllers. The std library provides a wide range of pre-built functionality, and standardized APIs, and abstracts many low-level concerns. As such, one might choose to use the Standard Library ( std) in embedded systems when they require rich functionality, and portability across different platforms, and desire rapid development without delving into low-level details. The choice between these approaches depends on the project's specific requirements, balancing control, efficiency, and development ease. ![]() ![]() Also, in the context of Rust, bare metal development is often referred to as no-std or "core library" development whilst non-bare metal is referred to as std of "standard library" development. Notably, real-time operating systems or RTOSs. ![]() There are OSs that are closer to bare metal than they are to non-bare metal. It is worth noting that bare metal does not necessarily mean no OS. In contrast, a non-bare-metal approach, often using an operating system or higher-level libraries, adds layers of abstraction, simplifying development but potentially introducing additional overhead and sacrificing some level of control over the hardware. It's ideal for resource-constrained systems, real-time applications, and situations where precise hardware control is crucial. Bare-metal programming involves writing code that directly interfaces with and controls the hardware, offering maximum control and minimal overhead. The difference lies in how they interact with the underlying hardware. In embedded development, there are two main development approaches bare-metal and non-bare-metal or high-level. Subscribe Now to The Embedded Rustacean std vs. If you find this post useful, and if Embedded Rust interests you, stay in the know by subscribing to The Embedded Rustacean newsletter: I figured it would be a good topic to tackle as it wasn't always clear-cut to me from the start. In this post, I would like to add some insight into the Rust ESP ecosystem. As such, it would be important for one to understand what lies beneath. With std development, this effect might be amplified as there can potentially be more levels of abstraction introduced. This was one of the reasons that drove me to start learning series at a certain abstraction level and just stick to that one level. All the added crates interfaces and examples mixing the different levels of abstraction can make one's head spin. The increased diversity while really beneficial, typically can have a significant disadvantage: confusion. This is significant as it allows non-embedded Rustaceans to ease into embedded development. On the other hand, ESPs also add support for std development. Many controller crates support no-std development only. Espressif with ESP controllers has a more diverse support ecosystem compared to other embedded controllers. ![]()
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