【正文】 .................................................................................................................................................. 5 系統(tǒng)總體方案 ......................................................................................................................................................................................................... 5 系統(tǒng)方案結(jié)構(gòu)圖 ..................................................................................................................................................................................................... 5 第三章 基于 GPS 授時(shí)的點(diǎn)陣 LED 屏顯示時(shí)鐘的系統(tǒng) ..................................................................................................................................... 6 NXP LPC11C24 主控板 ............................................................................................................................................................................................ 6 NXP LPC11C24 簡介 ......................................................................................................................................................................................... 6 開發(fā)環(huán)境 ........................................................................................................................................................................................................... 7 LPCXPRESSO 的項(xiàng)目建立 .................................................................................................................................................................................. 8 點(diǎn)陣 LED 屏顯示模塊 ............................................................................................................................................................................................ 8 P10 LED 點(diǎn)陣屏電路圖 ................................................................................................................................................................................... 9 P10 LED 點(diǎn)陣顯示屏的指標(biāo) .......................................................................................................................................................................... 9 LED 點(diǎn)陣屏上控制 LED 的亮滅原理 ..........................................................................................................................................................10 LED 點(diǎn)陣屏的動(dòng)態(tài)掃描原理 .......................................................................................................................................................................10 主控模塊 LPC11C24 與 LED 點(diǎn)陣屏的引腳連接 ....................................................................................................................................11 LED 點(diǎn)陣屏的顯示的軟件設(shè)計(jì) ...................................................................................................................................................................12 控制 LED 亮滅的設(shè)計(jì)過程 .......................................................................................................................................................................13 點(diǎn)陣屏的動(dòng)態(tài)掃描設(shè)計(jì)過程 ..........................................................................................................................................................14 BUF 緩沖區(qū)數(shù)據(jù)組織 ..............................................................................................................................................................................................15 時(shí)鐘顯示秒的控制 .......................................................................................................................................................................................19 GPS 衛(wèi)星數(shù)據(jù)接收模塊 GR87 ...........................................................................................................................................................................20 3. 技術(shù)簡介 ......................................................................................................................................................................................................20 GR87 ...............................................................................................................................................................................................................21 引腳功能 ..........................................................................................................................................................................................................21 GR87指標(biāo) ...............................................................................................................................................................................................................22 硬件接口 — UART .........................................................................................................................................................................................23 通信協(xié)議 NMEA ...........................................................................................................................................................................................24 主控模塊 LPC11C24 與 GR87的連接 ...................................................................................................................................................24 UART接收 GPS數(shù)據(jù)軟件設(shè)計(jì) .....................................................................................................................................................................25 供電電源的選擇 ....................................................................................................................................................................................................29 全 國 大 學(xué) 生 嵌 入 式 物 聯(lián) 網(wǎng) 設(shè) 計(jì) 大 賽 3 第四章 系統(tǒng)測試 ..............................................................................................................................................................