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目 錄
摘要 .............................................................. V
1. 緒論 ....................................................... 1
1.1 LED顯示屏的研究現(xiàn)狀及發(fā)展趨勢(shì) ................................ 1
1.2 LED顯示屏控制系統(tǒng)的研究現(xiàn)狀與發(fā)展趨勢(shì) .......................................... 3
1.3 GSM通信系統(tǒng) ................................................................................................. 2
1.4 課題的研究意義 ............................................................................................ 4
1.5本課題主要完成的內(nèi)容 ................................................................................. 6
2. 系統(tǒng)方案設(shè)計(jì) ................................................... 7
3. 硬件部分 ....................................................... 8
3.1 LED顯示屏 .................................................................................................. 8
3.1.1 LED顯示屏的顯示原理 .................................................................... 8
3.1.2 LED顯示屏的驅(qū)動(dòng)原理 .................................................................... 9
3.1.3 LED顯示屏的優(yōu)點(diǎn) .......................................................................... 10
3.2 ARM處理器 ................................................................................................... 11
3.2.1 ARM概述 ............................................................................................ 11
3.2.2 STM32簡(jiǎn)介 ........................................................................................ 15
3.2 ARM最小系統(tǒng)設(shè)計(jì) ....................................................................................... 16
3.2.1 電源電路介紹 ................................................................................. 18
3.2.2 復(fù)位電路 ......................................................................................... 19
3.2.3 JTAG調(diào)試電路 ................................................................................ 20
3.3 短信接收模塊 .............................................................................................. 20
3.3.3 TC35i引腳功能 ................................................................................ 24
3.3.4 SIM900A外圍電路設(shè)計(jì) .................................................................... 25
4. 短消息簡(jiǎn)介 .................................................... 28
4.1 短消息概述 .................................................................................................. 28
4.2 短消息的格式 .............................................................................................. 19
4.3 短消息的控制方式 ...................................................................................... 19
4.4 AT指令 ......................................................................................................... 20
4.5 短消息編碼 .................................................................................................. 20
4.6 Unicode編碼 ............................................................................................... 21
5. 軟件部分 ...................................................... 22
5.1本設(shè)計(jì)功能介紹 ........................................................................................... 22
5.2軟件編譯環(huán)境ADS1.2 .................................................................................. 22
5.2.1 ADS1.2概述 ...................................................................................... 22
5.2.2 ADS集成開發(fā)環(huán)境的組成 ................................................................ 23
5.3 流程圖設(shè)計(jì) .................................................................................................. 24
5.4 程序設(shè)計(jì) ...................................................................................................... 25
5.4.1 串口初始化程序設(shè)計(jì)以及頭文件 ................................................... 25
5.4.2 中斷程序設(shè)計(jì) ................................................................................... 26
5.4.3 串口接收函數(shù)設(shè)計(jì) ........................................................................... 26
5.4.4 主程序設(shè)計(jì) ..............................................30