【正文】 總體方案設計 ........................................................................................................... 7 TFT 液晶屏 ............................................................................................................... 7 第 4章 系統(tǒng)硬件設計 .................................................................................................. 8 核心板工作外圍器件 ............................................................................................... 8 復位電路 ........................................................................................................... 8 時鐘電路 ........................................................................................................... 8 JTAG 接口電路 ................................................................................................ 9 電 源電路設計 ......................................................................................................... 10 系統(tǒng)用電分析 ................................................................................................. 10 電源電路選型 ................................................................................................. 10 USB 接口電路設計 ................................................................................................ 10 打印機芯電路設計 ................................................................................................. 10 主位置檢測 ..................................................................................................... 10 缺紙檢測 ......................................................................................................... 10 黑標檢測 ......................................................................................................... 10 托架步進電機驅(qū)動 ......................................................................................... 10 走紙步進電機驅(qū)動 ......................................................................................... 10 打印頭保護與驅(qū)動電路 ................................................................................. 10 TFT 液晶顯示電路設計 ......................................................................................... 10 字庫芯片電路設計 ................................................................................................. 10 第 5章 系統(tǒng)軟件設計 ................................................................................................ 11 上位機軟件設計 ..................................................................................................... 11 USB 通信協(xié)議 ........................................................................................................ 11 USB 枚舉過程 ................................................................................................ 11 2 ZLG/USB Device 軟件包 ............................................................................... 12 打印機 ESC/POS 協(xié)議命令 ................................................................................... 13 打印機芯底層驅(qū)動 ................................................................................................. 13 TFT 液晶顯示 ......................................................................................................... 13 字庫芯片 ................................................................................................................. 13 第 6章 系統(tǒng)調(diào)試與結(jié)果分析 ..........................