Method for realizing serial peripheral unit interface

Abstract

Present invention relates to a multiple working mode serial peripheral interface implementation method, which contains through SPI configuration parameter configuring SPI working mode, then according to synchronous serial data frame relevant all programmable parameter under different kinds of working mode to proceed data receiving / transmitting, to realize full duplex synchronous series transmission. Due to the present invented SPI interface working mode and serial data frame relevant all parameter can be configured through software, therefore the present invented SPI interface can support current whole peripheral having SPI interface. And the present invention designed SPI expansion function, such as equipment enabling signal, can be configured into frame synchronizing signal, to support other general-purpose synchronous serial peripheral interface, enlarging SPI interface application field and reducing systematical designing on chip.

Description

technical field [0001] The present invention relates to serial communication technology, more precisely, relates to a method for realizing a serial peripheral interface. Background technique [0002] The serial peripheral interface is mainly used to complete the data conversion between the parallel bus interface and the external serial interface. It is especially suitable for the configuration and control of peripherals and devices, because such applications generally require low transmission rates and small data volumes. Moreover, because the logic of the SPI interface is simple, the interface pins are few, and the programming application is convenient, most peripherals / devices also support the SPI serial interface. [0003] Generally speaking, SPI adopts a synchronous serial communication method with a master-slave structure, and one master device can have one or more slave devices. The bus at the parallel bus interface varies with the type of parallel bus, while the sig...

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Problems solved by technology

But it also does not support full-duplex data transmission, and the division of frame types is relatively mechanical

[0014] At the same time, it is not difficult to see that no matter which of the above-mentioned interface implementation methods, the range of effective data bit width supported by it is small, and the process of receiving data by the master device is complicated: in addition to the command word, additional garbage data is required to generate the bit clock. Signal and slave device enable signal; although frame format 3 does not require additional garbage data, its command word is fixed at 8 bits, which greatly limits its application range

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