The path of my ZigBee learning

Everyone must have their own skills, to reflect their own value. Each should cultivate their own and the long, to achieve their own value. The world is cruel, but also fair, "Tiandaochouqin", I believe the pay will always be rewarded. Time, is a magical thing, it took everything, but also brought everything. It is the only thing we can grasp in our life. If we can live to be 90 years old, 365 days a year, 24 hours a day, we will have a total of 8,760 hours, 525,600 minutes. We have 672 hours a month, 168 hours a week, in these 168 hours, the difference between people is huge, in the final analysis, the accumulation of a little bit of achievement of that great self.

Here is to review their own to the current knowledge of ZigBee, to find a sense of accomplishment, so that later learning to a higher level.

First of all, learn ZigBee, you need to know Ti (Texas Instruments), Texas Instruments, the world's leading semiconductor company, headquartered in Texas, USA, Dallas. We learn the CC2530 used by ZigBee, exactly what they are designed for. CC2530, rather than a chip, is a solution, its core is 8051, including common timers, interrupts, watchdog, serial, and so on, and it also integrates the Rf,aes encryption processor to run the Z-stack protocol stack.

2. Speaking of RF, it is necessary to say 802.15.4, which regulates the physical layer and the data link layer of the MAC layer. The transfer rate of the 802.15.4 is low, which is why ZigBee uses this protocol. 802.15.1 is a medium speed, such as the use of Bluetooth in our daily life, is the adoption of this Protocol, in addition, 802.15.3 is high-speed, it is also understood that these different numbers represent what the meaning of.

3. In turn, said ZigBee, it can represent an alliance, the ZigBee Alliance, which is made up of some of the world's most bull companies, including TI, Philips, Motorola (later acquired by Google) and so on, it also represents a technology, that is above the PHY layer and the MAC layer, New NWK and apps are added.

4. We use ZigBee, its transmission frequency is 2.4Ghz, and Europe is 868MHz, the United States is 915Mhz. Their transmission rates are 250kbps, 20kbps, and 40kbps, respectively.

The 5.Zigbee has a total of 16 channels, numbered from 11 to 26.

The 6.ZigBee has three network topologies, namely, Star, tree and mesh. The RFD device in the Star network can not communicate directly, and can only be forwarded through the Coordinator.

　　

The 7.z-stack protocol stack, or Osal, is a small operating system, which is based on event triggering, and once it starts, it constantly queries for the occurrence of each event and, if it happens, executes the corresponding handler function.

8. There are a lot of macro definitions in the protocol stack, which gives me a deep understanding of what is "portability".

Summary, or that sentence, a bit of accumulation so that our success of the protection, believe that they can!

The path of my ZigBee learning