SPI (Serial Peripheral Interface)-based register fast read-write method

Abstract

The invention discloses an SPI (Serial Peripheral Interface)-based register fast read-write method. The method comprises a register read-write step and a register batch read step, wherein the register read-write step comprises the following sub-steps: changing an equipment gating signal CS to be effective, namely at low level, and keeping four beats effective continuously; at a first beat, transmitting a read-write command and a read-write address CMD [7:0] through an SDI (Serial Digital Interface) data line, wherein CMD [7] is equal to 0 and represents the read-write command, and CMD [6:0] is a read-write address; at a second beat, transmitting the data DATA0 through the SDI data line; at a third beat, reading old data DATA1 of the read-write CMD [6:0] through an SDO (Service Data Object) data line; at a fourth beat, reading new data DATA2 of the read-write address CMD [6:0] through an SDO data line, wherein the DATA2 is required to be consistent with the DATA0; changing the equipment gating signal CS to be high level and finishing the read-write of the register. The read-write method provided by the invention does not need multiple addressing, has a simple time sequence, is fast, simple and convenient to operate and plays an important role in improving the overall operation level and the institutional norms of SPI interface communication in China.

Description

technical field [0001] The invention relates to a method for reading and writing an SPI interface in the technical field of mobile communication, in particular to a method for quickly reading and writing registers based on the SPI interface. Background technique [0002] The SPI interface is a synchronous serial peripheral interface. As a general data interface, it is widely used because it is easy to use and saves system resources. The SPI interface is mainly used in EEPROM, FLASH, real-time clock, AD converter, and Between the digital signal processor and the digital signal decoder, it enables the MCU to communicate with various peripheral devices in a serial manner to exchange information. [0003] Since the SPI interface is a de facto standard and there is no standard protocol, most manufacturers refer to Motorola's SPI interface definition to design. Because there is no exact version agreement, there are certain differences in the technology of the SPI interface of d...

AI Technical Summary

Problems solved by technology

[0003] Since the SPI interface is a de facto standard and there is no standard protocol, most manufacturers refer to Motorola's SPI interface definition to design. Because there is no exact version agreement, there are certain differences in the technology of the SPI interface of different manufacturers' products. , it is easy to cause ambiguity, and some even cannot be interconnected

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