盲人导向仪说明书(2)

目 录

1 引言..........................................................................................................................................2

1.1 功能简介……..............................................................................................................2

1.2 系统简介…………………………………………………………………...……..….2

2 系统硬件设计…………….....................................................................................................2

2.1硬件框图……………………………………………………………………….….….2

2.2 硬件功能模块说明…………………………………………………………....……..3

2.3 常用功能函数介绍（用户API）…………………………………………………..9

2.4 磁偏角修正………………………………………………………………………..…9

2.5 SPLC501 液晶模组特性.….......................................................................................10

3 硬件电路.................................................................................................................................11

3.1 LCD显示器…….........................................................................................................11

4 应用举例……........................................................................................................................12

4.1 硬件连接.……...........................................................................................................12

4.2 操作步骤.……...........................................................................................................13

4.3 注意事项.……...........................................................................................................13

5 系统软件设计..........................................................................................................................13

5.1 主程序.........................................................................................................................14

5.2 键盘扫描..…...............................................................................................................14

5.3 PNI11096 驱动程序....................................................................................................15

5.4 液晶驱动程序….........................................................................................................16

5.5 盲人导向仪校正程.....................................................................................................17

5.6 盲人导向仪发送命令程序…….................................................................................18

5.7 更新时钟程序….........................................................................................................18

5.8 更新日期程序……............................................................................................….....19

5.9 更新秒表程序……….................................................................................................19

5.10 设置日期时间程序…...............................................................................................20 6 电子导向模组使用说明书…………………………………………………………………22

6.1 操作步骤………………………………………………………………………....….22 7 附录…………………………………………………………………………………………25

7.1 电路原理图………………………………………………………………….…....…25

7.2 丝印图…………………………………………………………………..…....…...…25

7.3 应用接口列表……………………………………………………………………….26

7.4 配件清单及配件说明……………………………………………………….…...….26

8 结语……….............................................................................................................................26