Category: Blog

Altera Qsys, NIOS II and FPGA fun

One very interesting feature of Altera FPGAs is that almost any system can be created in its next-generation system integration tool Qsys using a standard library of reusable IP blocks. The system interconnect fabric is automatically generated by Qsys and binds the blocks together. The system interconnect manages dynamic bus with matching, interrupt priorities, arbitration …

End of week — pin planner

This week was quite busy to complete my assignments for the FPGA Course. I was running out of time because I did not estimate properly my available free time and things got crowded at the office, at this end of week. With a lot to do there, I barely found any time to focus on …

FPGA Course

I’ve been quite busy lately and neglected the blog. I enrolled on Coursera for a very interesting FPGA course, in what seems to be a FPGA specialization from University of Colorado Boulder. I have always had somewhat a reserved attitude towards FPGAs mainly because I believed that these are hard to understand and need a …

Error opening serial port

Encouraged by the latest developments, today I started building a new application that will  allow remote connection to Kenwood TH-D74, remote control and APRS data transfer. However, while building and running the app I got the following error: If you encounter this, be aware that it is generated by application sandboxing. You can think of using …

BLE or “Bluetooth Low Energy”

Struggling to understand how Universal Unique IDs work (see here) I was wrongly assuming that Core Bluetooth is a framework from Apple that covers all aspects of communication with devices via BT. I was WRONG ! scanForPeripheralsWithServices method and, in general, what I tried to do, for almost a week, is NOT good for my intended …

Using UUIDs and Bluetooth

I did some more steps towards accessing Kenwood TH-D74’s services via bluetooth. I struggled for some time understanding how discovery based on UUIDs work. I was not aware that, for each service profile, there is a standard Universally Unique Identifier (UUID) documented in Bluetooth SIG specs. Specifically for Serial Port Profile (SPP) service, the UUID …

Why unsupported central manager state ?

Several days ago I received a Kenwood TH D74 portable transceiver. Although I have a Yaesu FT60 and some other smaller and unimportant transceivers, I don’t have any transceiver that is APRS capable. What’s more important, this transceiver is BT and USB capable, providing serial communication, which opens some interesting opportunities. Today I opened XCode …

Kenwood TH-D74

We first met — I think — in the summer of 2015 during the Hamfest in Friedrichshafen. At that time I had a mobile Kenwood transceiver TM-D710 which was quite nice by its own. However, after several months using the TM-D710 I got increasingly annoyed by some of its shortcomings, most of them purely subjective (but I …

Shelter for stray cats

Winter is finally here and the weather is suddenly much colder. I bought two styrofoam boxes, the types used for carrying fish, and I made two shelters for the stray cats. Hope will be warm and cosy. It just struck me that this is the 100 post I published on this blog. Nice. I have …

Disable iPhone automatic backup

My new iPhone X is beautiful, a bit too expensive for what it offers but… what the heck. It’s a nice toy. Fancy one. Yet, something annoys me each time I sync my phone with the iTunes. I do this mostly for syncing music from my library. Each time I press the sync button, a …