Technology for expanding single serial of set-top box

Abstract

The invention discloses a single-serial port expanding technology of a set-up box which is based on the expanding mode of the software of a microprocessor. The single-serial port expanding technology comprises: a system is initialized; then the microprocessor starts to judge whether an external serial port is short or not; if yes, then a factory testing procedure is carried out; if the testing procedure is passed, then a successful mark is output; if not, then a failure mark is output; after the mark is output, all the procedures are returned back to re-judge whether the external serial port is short or not; if not, then a normal working mode is carried out and a polling mode is used to judge whether data is sent out and send in or not, and sending or receiving is executed according to a judging result, thus finishing one turn of port communication. The single-serial port expanding technology of the set-up box has the advantages that the cost is lower; the core part is a microprocessor chip commonly used in the market; simultaneously, the interface is simple; a common IO port can be used to simulate; the application scheme is flexible; the added number of the serial ports basically do not need the cost on the hardware and only the software is needed to change.

Description

【Technical field】 [0001] The invention relates to the field of set-top boxes, in particular to a single serial port expansion technology of a set-top box. 【Background technique】 [0002] A set-top box (full English name is Set Top Box, referred to as STB) refers to an information device used to enhance or expand the functions of a TV. Because people usually put it on the TV, it is also called a set-top box or a top box. The current set-top boxes are divided into analog and digital, because the analog TV system is about to be eliminated, so the set-top boxes that people say now generally refer to digital set-top boxes. A digital TV set-top box is a conversion device that converts digital TV signals into analog signals, and can provide TV users with high-quality TV programs. Digital set-top boxes can support almost all broadcasting and interactive multimedia applications, including watching ordinary TV programs, digital encrypted TV programs, on-demand multimedia programs an...

AI Technical Summary

Problems solved by technology

The cost of the latter is relatively high, and the number of interface extensions is limited by the hardware chip

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