Design Of The Characteristic Impedance Tester Data Processing Module Based On OMAP-L138

The research content of this thesis is to design and develop the data processingmodule of characteristic impedance tester by embedded technology. The module isresponsible for communicating with other modules and processing collected data incharacteristic impedance tester. This thesis briefly introduces the principles andprograms of the tester, and elaborates the tester data processing module includinghardware interface circuit design, embedded system transplant, software design,hardware and software modules debugging. The main content is as follows:1. According to the overall program requirements of characteristic impedancetester for data processing module, TI’s OMAP-L138is selected as the processor chip.Then the peripheral hardware interface circuit is designed, including start-up modecircuit, UART circuit for debugging, the RJ45circuit for Ethernet data transceiver,EMIFA and SPI data transmission circuit to communicate with FPGA.2. The OMAP-L138boot process is to transplant embedded operating system tothe development board, which provides a stable operating environment for theapplication software. This thesis uses dual system development model to complete theconcrete development of embedded system transplant in the Linux operating system.And the Windows operating system is used to download image files and debugging,where U-Boot is used to start the operating system kernel, Linux kernel provides anoperating platform for applications and root file system provides applications withruntime environment.3. According to the functional requirements of the data processing module, thespecific programs are designed. The DSPLINK underlying device driver module isconfigured and compiled to process the data; The waiting queue and interruptmechanism is used to design EMIFA interface device driver, which meets the datatransmission requirement with FPGA; The communication protocol is to set up for datatransmission with PC and FPGA; Multi-process, inter-process communication, TCP/IPprotocol and other technologies are used to realize the upper applications.4. The debugging principle and programs are designed so that the data processing module can operate stably. Hardware debugging is based on the CCS developmentenvironment in the Windows operating system, including the minimum systemdebugging, DDR2SDRAM debugging, NAND Flash debugging, network portdebugging, and serial debugging; Software debugging is based on the Linux operatingsystem to debug the underlying hardware device drivers and the upper applications in across-compile way.