【正文】 打印設(shè)計(jì) A Bar Code Printing Based LPC1754 ABSTRACT With the rapid development of science and technology, bar code automatic identification technology information data, enter the important methods and means, it has been widely applied to the medical, mercial, industrial and other use of labels more industries. This paper describes a position of 32bit microcontrollers based on the LPC1754 of bar code printers, detail the hardware design of the entire hardware workflow, and each module. The system includes a stepper motor drive modules, thermal print head overheat protection module, the thermal print head is out of paper detection module, RS232 munication module and power supply and other functional modules. Wherein the stepper motor driver module controls the print head and take the paper cutter, thermal protection thermal printing head is used thermistor protection, in addition to the use of photoelectric sensors plete paper out detection, the use of RS232 serial port for printer and PC munication munication between machines. Power supply module to the control circuit and power the thermal print head. The design of the structure is relatively simple and can achieve a good bar code print control function, after repeated tests, can be very good implementation of bar code printing. Keywords: LPC1754 microcontroller stepper motor sensors RS232 thermal print head 基于 LPC1754 的條形碼 打印設(shè)計(jì) 目 錄 中文摘要 ..................................................................................................................... 1 英文摘要 ..................................................................................... 錯(cuò)誤 !未定義書簽。供電模塊給控制電路及熱敏打印頭供電。該系統(tǒng)包括步進(jìn)電機(jī)驅(qū)動(dòng)模塊、熱敏打印頭過(guò)熱保護(hù)模塊、熱敏打印頭缺紙檢測(cè)模塊、 RS232 通信模塊以及供電等功能模塊。 基于 LPC1754 的條形碼 打印設(shè)計(jì) 基于 LPC1754 的條形碼打印設(shè)計(jì) 摘 要 隨著科學(xué)技術(shù)的快速發(fā)展，條形碼技術(shù)是信息數(shù)據(jù)自動(dòng)識(shí)別、輸入的重要方法和手段，現(xiàn)已廣泛應(yīng)用到醫(yī)療、商業(yè)、工業(yè)等使用標(biāo)簽更多的行業(yè)。本文介紹了一種基于 32 位單片機(jī) LPC1754 的條形碼打印機(jī)的組成，詳細(xì)的闡述了整個(gè)硬件工作流程以及各個(gè)功能模塊的硬件設(shè)計(jì)。其中步進(jìn)電機(jī)驅(qū)動(dòng)模塊主要控制打印頭走紙及切紙，熱敏打印頭的過(guò)熱保護(hù)采用的是熱敏電阻保護(hù)方式，此外采用 光電傳感器完成缺紙檢測(cè)功能，采用 RS232 通信串口完成打印機(jī)與上位機(jī)之間的通信。本次設(shè)計(jì)結(jié)構(gòu)較為簡(jiǎn)單可以很好的實(shí)現(xiàn)條形碼打印控制功能，經(jīng)反復(fù)測(cè)試，可以很好的的實(shí)現(xiàn)條形碼打印。 1 緒論 ......................................................................................................................... 1 課題研究背景以及需求 ............................................................................. 1 課題研究的內(nèi)容和目標(biāo) ............................................................................. 2 研究的意義與價(jià)值 ...................................................................................... 2 2 系統(tǒng)設(shè)計(jì)原理及方案概述 ............................................................................... 3 系統(tǒng)方案概述 ................................................................................................ 3 需求分析 ................................................................................................. 4 控制系統(tǒng)總 體設(shè)計(jì) ...................................................................................... 4 控制系統(tǒng)的總體設(shè)計(jì) ............................................................................. 4 3 系統(tǒng)硬件設(shè)計(jì) ....................................................................................................... 6 電源電路 ......................................................................................................... 6 5V 電源電路 ............................................................................................ 6 電源電路 ........................................................................................ 7 電源保護(hù)電路 ....................................................................................... 10 主控系統(tǒng) ....................................................................................................... 11 最小系統(tǒng)電路 ....................................................................................... 11 邊界掃描系統(tǒng) (JTAG 接口 ) .................................................................. 13 復(fù)位電路 ............................................................................................... 15 時(shí)鐘電路 ............................................................................................... 16 步進(jìn)電機(jī)驅(qū)動(dòng)系統(tǒng) .................................................................................... 17 基于 LPC1754 的條形碼 打印設(shè)計(jì) 步進(jìn)電機(jī)驅(qū)動(dòng)模塊 ............................................................................... 17 步進(jìn)電機(jī)選型及其優(yōu)點(diǎn) ....................................................................... 19 打印頭工作模塊 ......................................................................................... 21 熱敏打印頭過(guò)熱保護(hù) 模塊 ...................................................................... 22 熱敏打印頭缺紙檢測(cè)模塊 ...................................................................... 23 4 系統(tǒng)軟件設(shè)計(jì) ..................................................................................................... 25 熱敏投打印初始化函數(shù) ........................................................................... 26 SPI 數(shù)據(jù)發(fā)送函數(shù) ..................................................................................... 26 SPI 初始化函數(shù) .......................................................................................... 27 熱敏打印數(shù)據(jù)處理函數(shù) ........................................................................... 27 熱敏打印頭停止打印函數(shù) ...................................................................... 27 總 結(jié) ....................................................................................................................... 29 致 謝 ....................................................................................................................... 30 參考文獻(xiàn) ................................................................................................................... 31 附 錄 ....................................................................................................................... 32 基于 LPC1754 的條形碼 打印設(shè)計(jì) 1