CE433 Embedded Devices Spring 2022
Homework 11 - SPI
Name: Ryan Jeanes
Email: rejeanes@fortlewis.edu

Homework 11 - SPI

Introduction
This assignment introduced how to use the SPI protocol on the basys 3 board in order to read data from a light sensor and display it on the 7-segment display.

Results
AThe only BCD value I was able to receive from the sensor was 0031, no matter how much light shone on the sensor or lack thereof. However, I do not believe this issue is caused by the circuit logic to display the BCD values on the board, because when the sensor is removed the displayed value changes to 0255, as expected. These BCD values also match the untranslated values being received from the sensor, as well.

Task 2

Here is the demonstration video. (Reuploaded this, since for some reason the video's processing failed without me realizing it).

Figure 1 - Top module, includes multiplexing for deciding which digit to display depending on which segment is selected.

Figure 2 - SPI receiver. Tried to flip sck on both clkdiv==8'd25 as provided in the example and 8'd24 as in the book. Neither changed behavior.

Figure 3 - The driver for the seven-segment display. Switching lit segment every 0.02ms, which resulted in being unable to perceive the blinking at longer delays.

Figure 4 - Provided binary-to-BCD verilog file, with no changes made.