This week I proceeded to test the firmware created by the previous interns. The first thing I needed to do was replicate their result. One thing I realised from this is not to remove the board support package in the harmony configurator, as it turns out to be important in the tcp ip stack initialization. I first tried the pic32blink test, which for me does not actually blink but toggles the led that indicates that the driver is busy with a previous Read more
Started the week by continuing on with implementing a hid keyboard on the pic32. While doing this I encountered two major problems, one is that the keyboard refuses to output two of the same characters consecutively, the other problem was when I tried going through the character array starting from the 0th position, it starts from an arbitrary position instead (sometimes 5th, 6th, but mostly 11th to 13th position). For the problem that it doesn’t print out two same letters Read more
This is my second week in Aeste, I was tasked to familiarize my self with MPLAB X and also harmony configurator, especially on USB stack and tcpip stack. For the tcpip part, I needed to host a web page on the pic32 esk, and after that was to enable ssl. There is already a wolfssl tcpip demo in the harmony configurator which you can use. But you have to copy the project to another location and set the directory of the harmony configurator. Read more
Started off my first week as an intern here at AESTE. Before coming here I had less than 2 weeks to study my pre-internship materials, as I had applied here late. First week involved studying using Git and also trying to understand the pre-internship study materials that I was given. Among some of the interesting things I learned was that in C coding, typedef can be used to create a fake type, which seems really useful. Confusing bit were pointers and structs, Read more
If you used Wt, you should be aware of the session timeout set in wt_config.xml. I think this ‘feature’ requires more explanation on it rather than When a session remains inactive for this amount of time, it is cleaned up After experimenting much with the timeout, it does not work as expected. And to summarize on the behavior, it is unreliable. The session timeout never triggers on time if the browser is closed. It is actually explained in detail by Koen in Read more
I continued to move all storage related actions to the back-end. The idea is to have a clear separation of front-end (consisting of widgets and callbacks) and back-end (handling of requests). When a complete model is built, the building blocks can be easily replicated and altered to cater for other services. Troubleshooting becomes a breeze too when things are built in an orderly fashion. Exploiting the refresh_token Since the discovery of the refresh_token, things are working out great. You can Read more
This week I am still working on the data corruption error when testing the write operations of each modules together. It took me quite a while to find out which part of JavaScript went wrong as I have to analyze every line of JavaScript codes related. The error occurs in the convertAddress function. The value ORed with the address of register is incorrect. This results in wrong value returned when the function is called and eventually generated wrong address value. My Read more
Caching So.. this week I focused more on building the file caching mechanism that fully uses the server’s back-end. I am using a write-back approach to handle the caching process. Initially, a fresh copy of the project will be downloaded and stored in local cache. The file will be sent to another back-end and will be open for edit. Changes in the CodeMirror editor or the synthesis completion will both initiate a request (using back-end) and sends the latest file to Read more
This week I dig deeper into identifying the TCPIP Stack bug. Ideal Case Based on the document UG380 and XAPP502, ‘init_b’ of FPGA should be HIGH (reading from PIC32), if it was LOW during configuration means there is an error, ‘init_b’ can also be pulled LOW to delay configuration, in other words ‘init_b’ is a multipurpose pin for FPGA. Even after configuration ‘init_b’ will still remain HIGH. Experiment Result Therefore at the start of my state machine (PIC32), by enabling Read more
This week I tried to show the data values on the simulator schematic when performing data transmission with UART, MSPI or I2C. When successfully reading or writing data, user will be allowed to see that the data in hexadecimal values are displayed beside the related ports of the module. To achieve this, I first created a text tag in the SVG JavaScript with a unique class name corresponding to the port. Next I created a new function in each JavaScript module Read more