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Digital Media Resources Here the digital resources referred to in the chapter web page are provided. It is a version of Figure of the book: In this section two main topics are covered in detail: However, one topic that is not covered is high-speed analog sampling.
Please review the earlier examples in Chapter 13 before tackling this topic. It is the most challenging PRU-ICSS code that I have written to date — the final outcome may seem reasonably straightforward, but there were several incorrect intermediate versions several!
I have purposefully structured it this way, so that you can build, test and become familiar with the limitations of the circuit in Chapter 8 before progressing to this, the high-speed version.
The MCP is used again for the first version of this circuit. It is a low-cost PDIP chip that has eight selectable channels. This fact allows for a breadboard implementation, but there are more advanced ICs available generally surface mountedsuch as the ADS Here are the features of the solution that is presented in this discussion: It has a configurable sampling rate — up to KSps with this IC.
The sampling rate can be configured from within Linux userspace. Higher sample rates are possible with alternative ADCs to follow soon. The samples can be captured free from jitter. Both PRUs are employed in order to achieve this. The quantity of data to be captured can be configured from Linux userspace and it is not limited by the relatively low PRU memory space size.
The current solution is limited by the amount of unused DDR memory. The PRU programs automatically determine Linux memory addresses and size limitations. A custom device tree overlay DTO is made available for this example. Here are the current downsides of the code example that is presented in this solution: The Circuit The Circuit is configured as in Figure Four lines are required for this IC as follows: This is an active-low line that must be brought low in order to capture a sample.
This line must be set high in between each sample. The colors of the lines are kept consistent throughout this example. The pins are configured by using the tables in Chapter 6.
Remember from the discussion in Chapter 13 that pru0 designated pins are accessible from PRU0, and pru1 designated pins are accessible from PRU1. Also, remember that r30 refers to an output, and r31 refers to an input; hence, pin Mode 5 and Mode 6 are chosen as follows:/*A C program is executed as if it is a function called by the Operating System, the Operating System can and does pass parameters to the program.
C++11 is a version of the standard for the programming language C++.It was approved by International Organization for Standardization (ISO) on 12 August , replacing C++03, superseded by C++14 on 18 August and later, by C++The name follows the tradition of naming language versions by the publication year of the specification, though it was formerly named C++0x because it was.
We can assign values to function pointer variables by making use of the fact that, in C, the name of a function, used in an expression by itself, is a pointer to that function.
Use of function pointers as parameters makes for flexible functions and programs. An example will illustrate the approach. Let us now write a program that reads. Program that provides an example of This pointer Posted By: Bathilda Schmidt Category: C++ Programming Views: Write a program that .
In this program, we have a pointer ptr that points to the 0 th element of the array. Similarly, we can also declare a pointer that can point to whole array instead of only one element of the array.
Introduction. This manual tells you how to use our LWDAQ software in combination with our TCPIP-based LWDAQ hardware. We describe the LWDAQ drivers, multiplexers, and benjaminpohle.com show how our TCPIP-based LWDAQ creates a stand-alone data acquisition system connected to the rest of the world through a single Ethernet socket.