Data support system for fuel cell city carriage
A fuel cell, city bus technology, applied in the registration/indication of vehicle operation, instruments, registration/indication, etc., can solve the problems of large data volume, increased cost, complicated design, etc., and achieves the effect of strong compatibility
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[0029] The data support system includes two modules, the time calendar module and the data storage module. Such as figure 1 For the system control structure diagram, two TPU units of the digital core MPC5xx are used as the module controller. Among them, TPUA controls the data storage module, and TPUB controls the time calendar module.
[0030] In the data storage module, the communication protocol between the SD card and the TPU is the SPI protocol, and the four ports of the TPUA are used to simulate the SPI protocol for communication. Since the digital core is a 5V power supply and signal system, and the SD card is a 3.3V power supply and signal system, a level conversion chip needs to be added between the two to convert the two level standards to ensure normal communication. At the same time, use a separate power chip to provide a 3.3V power supply system for the SD card. The CPU stores the data in the public RAM area that both the TPU and the CPU can access, that is, Par...
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