MicroBlaze软核处理器的SPI控制器设计

设计了一种基于Xilinx公司提供的MicroBlaze微处理器的SPI控制器。该SPI具有可配置的分频器、三线-四线转换功能,同时可以根据外接的芯片SPI总线需求配置其数据发送的方式。该SPI控制器的逻辑功能在Modelsim下仿真结果正确,并且在Virtex-7芯片上运用此控制器配置多款高速数据转换器、时钟芯片等。验证结果表明,该SPI控制器具有使用灵活、便于移植、易于使用、可以同时配置多片器件等优点。

基于RISC-V的多路光电容积脉搏波监测系统

针对光电容积脉搏波(Photoplethysm ographic,PPG),基于RISC-V内核设计了一款多通道、实时PPG监测系统。该系统使用RISC-V架构的E203 IP作为低功耗内核,通过ICB总线挂接模拟前端和蓝牙控制模块。AFE4400模拟前端控制模块控制背靠背LED实现两路PPG信号采集,复用该模块分时处理来实现多路采集。蓝牙控制模块挂接到E203实现了通过蓝牙外设下达系统控制指令,之后上传PPG波至终端。该系统通过FPGA验证了22位双通道PPG信号物联网终端应用。

Design of IP core based on AMBA bus

With the rapid development of integrated circuit(IC)technology,reusable intelligent property(IP)core design is widely valued by the industry.Based on the in-depth study of the functional characteristics of advanced microcontroller bus architecture(AMBA),a design scheme of IP core is presented,and it is divided into the functional modules,and the structural design of the IP core is completed.The relationship between the internal modules of the IP core is clarified,and the top-down design method is used to build the internal architecture of the IP core.The IP core interface module,register module,baud rate module,transmit module,receive module,and interrupt module are designed in detail by using Verilog language.The simulation results show that the designed IP core supports serial peripheral interface(SPI)protocol,the function coverage of IP core reaches 100%,the maximum working frequency reaches 200 MHz,and the resource occupancy rate is less than 15%.The reusable IP core can support multiple data formats,multiple timing transmission modes,and master/slave operation modes,reducing the resource consumption of hardware circuits and having stronger applicability.

SC16IS752、ADM2463在LPC2294扩展串口中的应用

在嵌入式设备中,串口是最常用、最简单的接口,如何扩展CPU的串口对于多功能嵌入式设备有着重要意义。介绍了LPC2294芯片使用串行外设接口(Serial Peripheral Interface,SPI)扩展出2路串口使用的应用实例,分析了芯片SC16IS752、ADM2463的特点以及在RS485、RS422这2种使用模式下的硬件和软件设计方法。