Blue Star

星期五, 03 06月 2022 20:56

Bluetooth Protocol Stack

The Bluetooth^® Special Interest Group (SIG) [1] and [2] defines the protocol stack for Bluetooth low energy (LE) and Bluetooth basic rate/enhanced data rate (BR/EDR) technology. The fundamental objectives of these specifications is to develop interactive services and applications over interoperable radio components and data communication protocols.

星期六, 28 05月 2022 13:21

Mathworks Matlab Bluetooth Toolbox

MathWorks Bluetooth^® Toolbox provides standard-based tools to design, simulate, and verify Bluetooth communications systems. It supports test waveform generation, golden reference verification, and Bluetooth network modeling.

With the toolbox, you can configure, simulate, and analyze end-to-end Bluetooth communication links. You can create and reuse test benches to verify that your designs, prototypes, and implementations comply with the Bluetooth standard, including Bluetooth basic rate/enhanced data rate (BR/EDR) and low energy (LE). You can also assess coexistence, interference, localization, and LE Audio scenarios by modeling multiple layers of the Bluetooth protocol stack.

星期五, 27 05月 2022 11:06

MQB-sniffer for Volkswagen Golf MK7

CAN-BUS sniffing for Volkswagen Golf MK7 (and most likely other MQB platform cars). Currently this is more a work log for future reference.

星期五, 27 05月 2022 10:47

Bluetooth LE Direction Finding for Tracking Node Position

This example shows you how to track the 2-D or 3-D position of a Bluetooth® low energy (LE) node by using Bluetooth® Toolbox.

Using this example, you can:

Simulate direction-finding packet exchange in the presence of radio frequency (RF) front end impairments, path loss, and additive white Gaussian noise (AWGN).
Track the node position by using Bluetooth direction-finding features and position estimation techniques.
Improve the location accuracy by using a Kalman filter from Sensor Fusion and Tracking Toolbox™.

星期五, 27 05月 2022 07:59

Bluetooth Protocol Stack

The Bluetooth^® Special Interest Group (SIG) [1] and [2] defines the protocol stack for Bluetooth low energy (LE) and Bluetooth basic rate/enhanced data rate (BR/EDR) technology. The fundamental objectives of these specifications is to develop interactive services and applications over interoperable radio components and data communication protocols.

星期五, 27 05月 2022 07:26

Bluetooth Low Energy Communication

Bluetooth Low Energy (formerly known as Bluetooth Smart) is a wireless communication protocol that uses Bluetooth with low-power peripheral devices. These peripheral devices include fitness trackers, health monitors, and personal electronics such as smartwatches or wireless headphones.

星期六, 21 05月 2022 20:15

MOS管源极和漏极的区别

对于绝缘栅NMOS管，接高压为漏端，接低压为源端。PMOS刚好相反。从原理上，NMOS载流子是电子，由低电压处提供，所以低压端称源端，PMOS载流子是空穴，由高压处提供，所以高压端称源端。

星期六, 21 05月 2022 20:10

MOS管的N沟道与P沟道之间的关系

NMOS的特性，Vgs大于一定的值就会导通，适合用于源极接地时的情况（低端驱动），只要栅极电压达到4V或10V就可以了。

PMOS的特性，Vgs小于一定的值就会导通，适合用于源极接VCC时的情况（高端驱动）。但是，虽然PMOS可以很方便地用作高端驱动，但由于导通电阻大，价格贵，替换种类少等原因，在高端驱动中，通常还是使用NMOS。
普遍用于高端驱动的NMOS，导通时需要是栅极电压大于源极电压。而高端驱动的MOS管导通时源极电压与漏极电压（VCC）相同，所以这时栅极电压要比VCC大4V或10V。如果在同一个系统里，要得到比VCC大的电压，就要专门的升压电路了。很多马达驱动器都集成了电荷泵，要注意的是应该选择合适的外接电容，以得到足够的短路电流去驱动MOS管。

星期五, 13 05月 2022 16:20

电动汽车上CAN报文解析

常用车辆CAN总线通讯协议，大多直接采用SAE-J1939的形式制定。电动汽车首先遇到了电池系统，电机系统等新加入电气需要重新设定PGN码等问题。CAN协议始终处在诸侯割据的状态。在过去的几年中，国家及相关机构也一直在对电动汽车的CAN通讯协议进行研究，希望形成统一的协议体系。统一的CAN协议，首先是零部件供应商的福音。当前主流主机厂，每家都有自己的整车通讯协议，各个供应商，需要根据整车厂的定义，修改零部件的CAN协议。

制定电动汽车的CAN协议，基本的思路是在SAE-J1939的基础上，根据自身电动汽车的需求，做出必要的调整。

星期五, 13 05月 2022 16:01

CAN 报文编码学习笔记:汽车CAN协议测试——发送与接收

工具：1、车厂协议，2、CAN盒模拟器+CANTest软件，3、CAN接收终端（GSM+GPS），4、平台

MathWorks Bluetooth® Toolbox provides standard-based tools to design, simulate, and verify Bluetooth communications systems. It supports test waveform generation, golden reference verification, and Bluetooth network modeling.

MathWorks Bluetooth^® Toolbox provides standard-based tools to design, simulate, and verify Bluetooth communications systems. It supports test waveform generation, golden reference verification, and Bluetooth network modeling.