Flushbonading stored program control exchange for expanding embedded processor GPIO by using CPLD

Abstract

The invention discloses a method for expanding an embedded processor general purpose input / output (GPIO) by using a complex programmable logic device (CPLD), wherein expands the embedded processor GPIO by using the CPLD to control multi-path voice modules and technology. The method effectively and organically combines the low-cost CPLD and the high-end embedded processor together so that a user conveniently finishes rich additional functions by using the same embedded processor. The method can expand GPIO wires in a number of subtracting 4 from the actual GPIO number of the CPLD at most by using 4 GPIOs (using a bus interface of software simulation serial peripheral interfaces (SPI)) of the embedded processor, or 1 hardware SPI interface and 1 GPIO so as to greatly enrich the application range of the embedded processor.

Description

technical field [0001] The invention relates to a method for expanding the GPIO of an embedded processor, in particular to a communication technology involving using a CPLD device to expand the GPIO of the embedded processor. Background technique [0002] With the development of science and technology and the improvement of chip technology, more and more embedded processors (especially digital signal processors) provide users with higher and higher single-chip performance and smaller and smaller single-chip Size and lower and lower power consumption, so that the user's design becomes easier, faster and lower cost, but at the same time, some users will encounter the situation that the GPIO is not enough in the actual design, sometimes the user for To expand the number of GPIOs, more logic devices have to be added, or embedded processors with more GPIOs have to be replaced. The former uses multiple chips, which will greatly increase the size of the printed circuit board and th...

AI Technical Summary

Problems solved by technology

[0002] With the development of science and technology and the improvement of chip technology, more and more embedded processors (especially digital signal processors) provide users with higher and higher single-chip performance and smaller and smaller single-chip Size and lower and lower power consumption, so that the user's design becomes easier, faster and lower cost, but at the same time, some users will encounter the situation that the GPIO is not enough in the actual design, sometimes the user for To expand the number of GPIOs, more logic devices have to be added, or embedded processors with more GPIOs have to be replaced. The former uses multiple chips, which will greatly increase the size of the printed circuit board and the wiring. workload, while the latter may introduce more hardware cost and design difficulty

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