The greatness of Linux lies in its efficiency in utilizing system resources. In certain cases, you may need to heavily use your Linux system, such as when running virtual machines, playing video games, or editing 4K videos. In these situations, you need to monitor resource usage. Here are some super useful system monitors in Linux … Read more
In Linux systems, symbolic links (Symbolic Link, abbreviated as Symlink) are a very practical type of file system object, similar to shortcuts in Windows systems. Symbolic links can point to files or directories, providing users with convenient access paths. However, sometimes we may need to delete symbolic links that are no longer needed. This article … Read more
The article on building the ESP Bootloader under Zephyr for ESP32-C3 mentions that Zephyr also supports booting from MCUBoot: ROM-> MCUboot -> Zephyr.bin ( App ) As previously explained about the ROM, this article focuses on analyzing the booting part of MCUboot. Building Using west -v build -b esp32c3_zgp –sysbuild zephyr_sample/ — -DBOARD_ROOT=/mnt/g/project/v3.4.0/zephyr_sample/ -Dmcuboot_BOARD_ROOT=/mnt/g/project/v3.4.0/zephyr_sample/ to … Read more
The Zephyr development environment supports three major operating systems: Windows, Linux, and MacOS. However, the most comprehensive support is for Linux, so it is recommended to use Linux for beginners. This article is based on Ubuntu 22.04. In some sense, this is a rehash of previous articles because similar content has been covered: Building Zephyr … Read more
Singly Linked List The Zephyr singly linked list is implemented in the following file: zephyr/include/zephyr/sys/slist.h. Zephyr stores singly linked list data in sys_slist_t (i.e., each list element stores a pointer to the next element, rather than the data of the previous element). /** @cond INTERNAL_HIDDEN */ struct _slist { sys_snode_t *head; sys_snode_t *tail; }; /** … Read more
This article provides an overview without technical details or usage instructions. The Zephyr kernel uses a generic data structure library, which can also be utilized in applications. The data structures include: Linked List Packet Buffer Red-Black Tree Circular Buffer It is important to note that the APIs for accessing these data structures are not thread-safe. … Read more
Overview MPSC_PBUF (Multi Producer Single Consumer Packet Buffer) is a circular buffer where data in MPSC_PBUF is managed in packets, and the size of the packets is variable. Users read or store data from MPSC_PBUF in packet units. To reduce data copying in memory, data production is divided into two steps: allocating packet space and … Read more
The development of e-cigarettes has led to a market trend where technology is increasingly leaning towards small smoke products, including nicotine salts, N-generation ceramic atomization technology, and multiple leak-proof packaging… Nevertheless, the core technology of e-cigarettes remains unchanged; beyond “atomization” and “e-liquid”, the most critical component is the “battery”. The battery not only determines the … Read more
Overview The search time complexity of a linked list is O(N). As the number of members managed by the linked list increases, the algorithmic cost of searching increases. To address this, Zephyr provides an implementation of a red-black tree, where the time complexity for search and delete operations is O(log2(N)) for a tree of size … Read more
In Zephyr, there are two boot processes for the ESP32 series SOC: No MCUboot: ROM-> ESP Bootloader-> Zephyr.bin (App) With MCUboot: ROM-> MCUboot -> Zephyr.bin (App) This article focuses on the no MCUboot part. ROM In ESP32C3, the ROM is referred to as the “First stage bootloader”. The ROM is hard-coded into the ESP32C3 and … Read more