【正文】 .............................................................1 數(shù)據(jù)采集系統(tǒng)及發(fā)展歷程 ...............................................................................................1 I2C 總線(xiàn)及優(yōu)點(diǎn) ................................................................................................................12 系統(tǒng)方案 .................................................................................................................................3 系統(tǒng)方案簡(jiǎn)介 ...................................................................................................................3 系統(tǒng)總體方案的確定 .......................................................................................................3 主控制器方案的選型 ................................................................................................3 I2C 擴(kuò)展芯片的選型 ..................................................................................................4 溫度傳感器的選型 ....................................................................................................4 LCD 液晶驅(qū)動(dòng)器的選型 ............................................................................................5 A/D 轉(zhuǎn)換器的選型 .....................................................................................................5 總結(jié) ...................................................................................................................................53 P89LPC922 單片機(jī)及 I2C 接口 .............................................................................................6 P89LPC922 單片機(jī)概述 ...................................................................................................6 芯片內(nèi)部框圖 ............................................................................................................6 引腳配置 ....................................................................................................................7 I/O 口 .................................................................................................................................7 I/O 端口配置 ..............................................................................................................8 準(zhǔn)雙向口輸出配置 ....................................................................................................8 開(kāi)漏輸出配置 ............................................................................................................8 僅為輸入配置 ............................................................................................................8 推挽輸出配置 ............................................................................................................9 中斷 ...................................................................................................................................9 I2C 總線(xiàn)接口 ....................................................................................................................9 概述 ............................................................................................................................9 I2C 特殊功能寄存器描述 ........................................................................................10 I2C 操作模式 ............................................................................................................12 總結(jié) .................................................................................................................................134 硬件電路設(shè)計(jì) .......................................................................................................................14 單片機(jī)控制電路 .............................................................................................................14 LED 顯示模塊 .................................................................................................................15 遠(yuǎn)程傳輸模塊 .................................................................................................................16 電源模塊 .........................................................................................................................18 溫度測(cè)量模塊 .................................................................................................................18 A/D 轉(zhuǎn)換器 PCF8591..............................................................................................19 溫度傳感器 AD590.................................................................................................19 總結(jié) .................................................................................................................................205 系統(tǒng)軟件設(shè)計(jì) .......................................................................................................................21 MAIN 函數(shù)設(shè)計(jì) ...............................................................................................................21 I2C 發(fā)送數(shù)據(jù)函數(shù) ..........................................................................................................22 鍵盤(pán)中斷函數(shù) .................................................................................................................23 鍵盤(pán)處理函數(shù) .................................................................................................................23 LED 顯示函數(shù) .................................................................................................................24 A/D 轉(zhuǎn)換函數(shù) ..................................................................................................................24 總結(jié) .................................................................................................................................256 總結(jié)與展望 ...........................................................................................................................26 課題總結(jié) .........................................................................................................................26 課題展望 .........................................................................................................................26致 謝 ........................................................................................