Device and method for controlling thermal printer by using GSM module with SPI interface

Abstract

The invention relates to the field of electronic control, more particularly to a method for controlling a thermal printer by using a GSM module with a SPI interface. The control device of the invention is extended to connect with a memory by using a data transmission and connection capability port of the SPI interface of the GSM module so as to store font data, and controls a data latch unit, a paper detection unit and a heating unit of the thermal printer by using the data transmission and connection capability port of the SPI interface of the GSM module; a temperature detection unit of the thermal printer enters the capability port of the GSM module via a voltage comparator in order to form detection interruption; and a secondary capability port of the GSM module converts two-waveform into four-waveform through a stepping motor driver so as to drive the stepping motor of the thermal printer. Hence, ideal application effect can be obtained on SIM300 module according to the invention and the friendly display of MMI human-computer interface can also be well satisfied.

Description

technical field [0001] The invention relates to the field of electronic control, in particular to a method for realizing thermal printer control by using a GSM module with an SPI interface, and is especially suitable for the extended application of the SIM300 module. Background technique [0002] With the popularization of the GSM module application, more and more occasions need to realize the bill printing function on it, for example: the mobile terminal developed with the SIM300 module needs to have the printing of mobile recharge bills, the printing of call details, and the SIM card remote Printing of card writing bills, printing of electricity payment bills, etc.; in general occasions, you can choose a miniature thermal print head with fast printing speed, low noise, high reliability, clear writing, small and light head as the actuator. [0003] SIM300 module is a GSM dual-frequency module launched by SIMCOM, which mainly provides wireless interface for voice transmissio...

AI Technical Summary

Problems solved by technology

[0005] Therefore, in the application of the GMS module, especially for the problem that the software timer of the SIM300 module has poor precision and cannot directly control the thermal print head and the problem of insufficient ROM space, the utility model proposes a method using a voltage comparator combined with software Interruption and the method of controlling the speed of the stepper motor with instruction delay in the program solves the problem that the MMI timer of the SIM300 module has poor response accuracy and cannot do precise timing control; at the same time, the system uses the method of hardware SPI multiplexing not only solves the problem It solves the problem that the ROM space of the SIM300 module cannot store a large font, and effectively improves the reading and writing speed of the font chip and the shifting speed of the print head data, so that the built-in resources of the SIM300 module can be fully utilized

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