为了让弱视者和盲人群体能够发送短信，提出了一种基于嵌入式处理器SEP4020的盲文输入方法。针对盲文语言的特征，设计出一种六点盲文输入方法，并给出了在触摸屏上提取盲文的方法和步骤。在此基础上将盲文语言转换成汉语拼音，使会汉语拼音的普通人能够阅读盲人发过来的短信内容。最后以发送内容“你好”为例分析了短信发送的过程和PDU编码形成的方式，并成功地将系统移植到开发平台上。实验结果显示了能够正确获取在触摸屏上输入的盲文，并成功将转换成的汉语拼音通过无线模块发送出去，证明了这个方法的可行性和有效性。

In order to enable the blind and visually impaired groups to send text messages, a Braillebased embedded processor SEP4020 input method is presented. Aiming at the characteristics of the Braille language, a six Braille input mode is designed, and the extraction methods and steps of Braille on the touch screen are presented. On this basis the Braille language is converted into the Chinese Phonetic Alphabet, so that ordinary people would be able to read the message sent by the blind .Finally the text "Hello" is sent as an example to analyze the process of SMS and the encoding method of PDU, and the system is successfully transplanted to the development platform. The experimental results show that the touch screen input Braille language can correctly be accessed, and the converted pinyin can successfully be sent via wireless modules, and the feasibility and effectiveness of this approach is proved.