摘要
以CYPRESS公司的EZ-USB FX2芯片为基础,对工业CT数据采集系统的USB接口设计所涉及的几个方面进行了详细的介绍。该设计中为了能提高数据传输的速度,EZ-USB芯片采用Slave FIFO接口方式,在此方式下,USB内核不参与数据的传输。CY7C68013A芯片内部包含有4 KB的可配置端点缓冲区,这是大容量数据传输端点,可配置成不需要8051固件参与就同外围电路完成高速数据传输端。CYPRESS公司提供的EZ-USB固件程序开发包中包含有固件程序的基本框架。在此介绍CY7C68013A芯片的结构和特点,分析EZ-USB FX2固件程序框架,并给出固件程序实例代码,描述固件代码装载方式,应用程序调用驱动程序的接口函数。采用EZ-USB芯片开发USB接口,大大降低开发难度,提高开发效率。
Taking EZ-USB FX2 interface chip as an example,several aspects involved with USB interface design of indus-trial CT data acquisition system are introduced in detail in this paper. In this design,Slave FIFO is used in EZ-USB chip to im-prove the speed of data transmission. In this way,the USB kernel is not involved in the data transmission. Inside theCY7C68013 A chip,4 k B configurable endpoint buffer is contained. It is the large capacity data transmission terminal,whichcan be configured to fulfill high-speed data transmission with peripheral circuit,but does not need 8051 firmware program tojoin with. The basic framework is contained in the EZ-USB firmware program development kit provided by CYPRESS company.In this paper,the structure and characteristics of the CY7C68013 A chip are introduced,the EZ-USB FX2 firmware frame is ana-lyzed,the firmware example code is given,the firmware code loading way is described,and the interface between applicationprogram and driver is illustrated. With USB interface developed by means of EZ-USB chip,the development difficulty was great-ly reduced,and the development efficiency was improved.
出处
《现代电子技术》
北大核心
2015年第4期73-76,共4页
Modern Electronics Technique
基金
兰州大学自然科学类中央高校基本科研专项(860452)
