Implementation method of multi-channel temperature chip interface based on fpga

Abstract

FPGA-based multi-channel temperature chip interface implementation method, the steps include: (1) frequency division to obtain the system clock (2) system reset (3) system initialization (4) simultaneously write to the n-way temperature chip and skip reading the ROM code, by writing 0 and write 1 operations are completed in order from low to high; then write the start temperature conversion code to n channels at the same time (5) judge whether n channels are busy, if all channels are busy, continue to query until n channels are not busy, the system performs the second Initialize (6) skip reading ROM codes for n channels at the same time, and then write and start reading temperature value codes for n channels at the same time (7) read the temperature values ​​of each channel and store them in corresponding registers, and address each shift register for The CPU reads (8) the system is reset, and a new round of temperature collection is started. The present invention realizes the method of generating timing in FPGA and communicating with multi-channel temperature chips through the idea of ​​parallel processing, and solves the existing problems of low temperature acquisition accuracy, too much FPGA resources occupied, and too much CPU time occupied by timing operations.

Description

Implementation method of multi-channel temperature chip interface based on FPGA technical field The present invention relates to a kind of multi-channel temperature chip interface realization method based on FPGA, particularly a kind of In the case of less field programmable logic device FPGA logic resources, it is more complicated to complete the configurable multi-channel DS18B20 temperature chip Complicated interface implementation methods. Background technique At present, the interface operation about DS18B20 temperature chip mostly adopts the software sequence control based on the IO mouth of single-chip microcomputer The control is implemented by C or assembly language programming, and the CPU cannot perform other calculations during program execution. Therefore, using a single The disadvantage of realizing temperature collection in the form of computer + DS18B20 is that it takes up too much CPU time. The interface operation about DS18B20 temperature chip al...

AI Technical Summary

Problems solved by technology

The time sequence related to the production and DS18B20 is used to communicate with DS18B20 for temperature acquisition, which solves the problem of low accuracy of temperature acquisition and occupation of existing technology.

There are too many FPGA resources and the timing operation takes up too much CPU time.

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