详细介绍
XI16E1-E4.0
厦门莫格电气自动化有限公司是一家专业提供工业自动化领域的备件服务商,产品品种齐全、价格合理,公司实力雄厚,重信用、守合同、保证产品质量,以多品种经营特色和薄利多销的原则,赢得了广大客户的信任。
我们主营PLC可编程控制器模块,DCS卡件,ESD系统卡件,振动监测系统卡件,汽轮机控制系统模块,燃气发电机备件等,公司致力于为工业用户提供自动化解决方案,打造工控备件一站式供应平台。
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公司以电子商务模式运营、缩减中间环节、为消费者在*时间提供优质的产品及满意的服务,公司拥有完善的物流供应系统、现已与众多国外生产厂商建立了良好的合作关系。
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(2字节) 0x1111ARM核的芯片基本上都遵循JTAG规范,并带有边界扫描功能,此类芯片内集成了一个JTAG电路结构。JTAG电路由TAP(测试访问端口)、TAP控制器、指令寄存器、测试数据寄存器组成。另外,ARM7TDMI核还包含了一个提供在线调试支持的EmbeddedICE宏单元。图1系统框图EmJTAG和PC机通过USB总线连接,与目标板则遵循JTAG调试接口标准。JTAG规范中,使用称为“边界扫描单元”的基本结构。边界扫描单元将JTAG电路与处理器逻辑电路起来,通过它可以将一个输入信号加载到处理器逻辑中而不影响逻辑的其他电路,也可以将处理器逻辑的输出信号采样到边界扫描单元中。若干个边界扫描单元构成边界扫描寄存器(BSR),也称为“边界扫描链”。边界扫描寄存器的数据通过JTAG接口的TDI引脚和TDO引脚串行移进移出。PC机上需要实现: EmJTAG的USB驱动程序和调试器软件。EmJTAG上需要实现: USB固件程序和用于产生JTAG信号的边界扫描程序。2硬件设计和实现系统的硬件部分主要是指协议转换器EmJTAG的实现。协议转换器的功能,就是接收PC机上调试器软件发送的远程调试协议信息,将它转 换成JTAG时序信号发送到目标板,然后把目标板的反馈信息或者数据返回给PC机的调试器软件。EmJTAG使用意法半导体(ST)公司的ST72651芯片,原理框图如图2所示。它集成了1个全速(12 Mbps)USB接口模块,1个时钟频率为24 MHz的数据传输协处理器(DTC),32 KB程序存储空间,5 KB RAM,硬件I2C和SPI接口,多达47个可编程I/O口;工作电压为2.7~5.5 V,由USB直接供电。图2EmJTAG原理框图与PC机通信方面,USB接口部分只需要将DP脚上拉一个电阻,使PC机识别到USB设备。DTC模块产生4个时钟信号作为JTAG时钟信号(TDI、TDO、TMS和TCK),由I/O口引出,外部再加一个接口驱动芯片74LVC244,将这4个信号连接到标准的JTAG接口上。TAP控制器复位信号nTRST和系统复位信号nSRST通过I/O逻辑直接控制。EmJTAG采用USB供电方式,同时在TCK引脚上连接一个指示灯BUSY,显示系统是否处于忙状态。接口驱动芯片74LVC244由内部集成的电压校准器产生3.3 V来提供电压。3软件设计和实现软件部分主要包括: PC机上的调试器软件,EmJTAG协议转换器的PC端驱动程序以及EmJTAG中的固件程序。3.1PC机上的调试器软件采用VC++ 6.0 MFC。其主要功能是与EmJTAG的PC端驱动程序通信,将调试命令通过USB总线发送至EmJTAG。3.2EmJTAG的PC端驱动程序使用Driverstudio3.1开发Windows下的USB驱动程序,使EmJTAG和PC机的应用程序可以进行数据交互。 3.3EmJTAG中的固件程序固件程序使用意法半导体(ST)开发工具STVD7 for InDART STX进行开发。这一部分也是调试系统zui重要的部分,即如何产生JTAG时序信号控制ARM核。EmJTAG中的固件分成以下多个模块实现。3.3.1DTC软件插件程序模块图3DTC功能框图DTC功能框图如图3所示。DTC是ST72651内部集成的数据传输协处理器,也是一个通用的串行/并行通信接口。通过改变其内运行的插件程序,DTC可以方便地完成不同的高速数据传输操作。插件程序(zui大为256字节)开始时存放在ST72651的Flash中,芯片运行的程序会将插件程序加载到DTC SW RAM中,然后控制DTC运行这段插件程序。ST7核也可以读写DTC的数据传输缓冲区,因此需要有一个仲裁电路用于防止ST7核和DTC访问该缓冲区时发生冲突。DTC有一套简单的指令集。ST7核通过DTC控制寄存器DTCCR控制DTC的操作,通过DTC状态寄存器DTCSR查询DTC的状态,通过DTC指针寄存器DTCPR改变DTC的操作指针。DTC有4种操作状态: 空闲状态(IDLE),加载插件程序状态(RAMLOAD),运行状态(RUNNING)和改变操作指针状态(POINTERCHANGE)。通过改变DTCCR寄存器的RUN、INIT和LOAD位可以实现4种状态间的转换。将插件程序加载到DTC SW RAM中的步骤如下: ◆ 清除DTCCR寄存器的RUN位,使DTC进入IDLE状态,停止DTC;◆ 设置DTCCR寄存器的LOAD位,使DTC进入RAMLOAD状态,以允许写DTC RAM;◆ 将插件程序复制到DTC SW RAM中;◆ 清除DTCCR寄存器的LOAD位,使DTC返回到IDLE状态,恢复DTC RAM写保护。使DTC运行其RAM(即DTC SW RAM)中的插件程序的步骤如下: ◆ 清除DTCCR寄存器的RUN位,使DTC进入IDLE状态,停止DTC◆
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