The SPI protocol is a commonly used high-speed, full-duplex, synchronous serial communication protocol, widely used for data exchange with sensors (such as temperature sensors, pressure sensors, etc.), data storage and retrieval from storage devices (such as EEPROM, FLASH memory), control of display modules (such as LCD screens, OLED screens, etc.), communication with wireless communication modules … Read more
Ahem… another sleepless night tortured by SD cards! I remember a young engineer asking me last week, “Why does his data keep disappearing after writing?” This reminded me of my own struggles back in the day. The SD card, though seemingly insignificant, often gives engineers a headache… What exactly is an SD card? Simply put, … Read more
After using ULINK2 with a high version of Keil, it cannot be used with a lower version due to hardware upgrades in ULINK2 by the Keil software. If you want to continue using ULINK2 with a lower version of Keil, you just need to initialize ULINK2. The specific steps are as follows: 1. Insert the … Read more
Recently, the eMMC of the product encountered some issues. In response to these issues, I read the relevant sections of the Embedded Multi-Media Card (eMMC) Electrical Standard (5.1) JESD84-B51 and recorded the eMMC boot process as follows. The above figure shows the eMMC power-on process, with the following steps: 1. Power on VCC and VCCQ, … Read more
Search on WeChat Jicheng Training The HMI touch screen may experience touch drift due to various factors such as installation or site conditions, resulting in the touch position not aligning with the actual action point. 1. When the HMI experiences touch drift, first check if the bolts are too tight, causing the surface panel to … Read more
eMMC, as a common hardware interface in high-speed circuit design, is often used for storage in IOS systems or for storing critical product information. This article will analyze the eMMC protocol and combine it with some unconventional bugs encountered in actual work, aiming to master the circuit design and problem analysis of the eMMC interface … Read more
1. Basic Mechanism of Driver Initialization Zephyr’s driver initialization is implemented through the following mechanisms: Device Tree : Hardware resources are defined through the device tree, and the driver relies on this information for initialization. Initialization Macros (DEVICE_DT_DEFINE and DEVICE_DEFINE) : The driver registers to Zephyr’s device model using these macros. Initialization Priority : The … Read more