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In this lecture, I will explain how to describe the simple calculator project in Etchells to be synthesized

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into a combination circa.

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Let's first break the project into a couple of functions.

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The Atlas project contains two groups of C C++ functions.

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The first group is for the design and the second group is testing the design.

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The design should contain a top function that encompasses all the design functionality.

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There are three subtasks in the design performed operation, extract the results, digits, display

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the digits.

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Three functions will implement these tasks, the display digits, a function called another function

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to obtain the corresponding seven segment code.

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The Test match part starts with a C C++ main function, a software implementation of the project provides

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a golden model which its outputs should be compared with the design results.

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The main function should generate the input vectors and upload them to the design and the golden model

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and then compare the results and reports.

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Any discrepancy.

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Before describing the design functionality, it is better to define a few arbitrary precision data types.

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We also need to declare a constant Arry to keep the seven segments code from digit zero to EF.

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In addition, we need this segment code for the minus sign and when all the segments are off.

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They're designed to function Recife's five inputs and generates three outputs, the inputs are declared

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as called Waverly Arguments and outputs are defined as Coleby reference arguments.

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These inputs and output arguments model the hardware parts.

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As mentioned before, the design top function called three functions to perform three tasks, the first

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one is called Operations, which needs to input numbers along with operation code and generates a result.

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The second one, called Extract Digits, receives the result of the previous function and generous four

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digits to be shown on seven segments.

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The last function that is displayed digits shows the digits and seven segments.

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You also show all the input data generated by the slide switches, and these are available on the board.

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The operations function uses a switch case statement to select and perform one of the operations based

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on the code value.

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That selected its function, receives the result of the operations function, detects the result sinus

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and extracts its three digits.

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Firstly, it checks the result value and if it's negative, since the variable sign and then negate

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the results ready for extracting its digits, then based on the display, it uses two different methods

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to extract the digits.

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If the display mode is decimal, then the division by ten operator is used to exact the digits.

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If the display mode is hex, then every four bits constitute a digit.

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They display the dysfunction, call a segment digit code function to get the segment display code corresponding

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to each digit and then based on the press push button turns on a seven segment.

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The salmon segment digit code function utilizers to each case statement to retrieve a desired salmon

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segment code from the Salmon segment code ARRY.

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Now, let's explain the test punch code, which would start with the C C++ main function, as mentioned

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along the course, the main function defines the status variable to return the test bench success status.

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It utilizes five nested loops to generate all the possible inputs for the system.

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Then prepare the designs to function arguments.

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Finally, it applies the data recorders to the design function and the software implementation, then

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reports any differences in the results.

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After explaining the system functions, we should put all the courts together in a rather Atlas project

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and program our FPGA and play with the calculator.

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This would be the goal of the next lecture.