RFID system software design,china pet microchip manufacturer factory

　　RFID system software design

　　Wireless communication protocol

　　Wireless transmission adopts FSK modulation method, and its Manchester encoding and decoding are automatically completed by the on-chip hardware. The door control commands in the tire module and the key module send data in the form of data packets (frames), and the data frame formats are shown in Table 1, respectively.

　　Tire module software process

　　When the car is at a standstill or at a low speed, even if the tire pressure changes, it will not pose a threat to safe driving. At this time, it is not necessary to collect pressure, temperature and other signals or reduce the number of collections. The process is shown in Figure 4.

　　After the system is powered on and reset, initialize the configuration and start to measure the acceleration and judge the state of the car. If the vehicle speed is below 25 km/h, it will enter the dormant state and judge the state of the vehicle again after a delay; if the vehicle travels at a speed greater than 25 km/h, it will enter the normal working mode for signal acquisition, processing and transmission . Then it returns to the acceleration measurement state after a period of sleep delay.

　　Key module process

　　The user can open and close the door by sending radio frequency data through the button switch on the key module. For the security of the system, rolling code encryption is performed on the sent data, and it enters the stop mode after sending. The software flow of the remote control door lock is shown in Figure 5.

　　Base station module process

　　When the car is not started, the base station module executes the remote door lock function and needs to monitor the RF door control signal from the key module (the user presses the button on the key). When the remote control key is inserted into the ignition lock and rotated to the starting position, the transponder in the key and the PJF7992 of the base station module perform ignition verification, and then transmit the command to allow starting through the LIN bus. After the car is started, the base station module enters the tire parameter monitoring mode. By setting a reasonable polling interval, the number of RF responses of the tire module can be reduced, and the system power consumption can be reduced. The software flow is shown in Figure 6.

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