Project of a Curve Tracer Released!
I have finished & released my build of the Analog Curve Tracer. Complete design is available on the permanent page in the Project menu above.
Cheap AVR UPDI Programmer from ATtiny817 Xplained Mini
New AVR processors from Microchip/Atmel use a 1-wire UPDI interface for flash programming. You could use either AVR ICE or Pickit 4 as the “official” programmers (I did not test any of them). Both of these cost >50 EUR. A… Continue Reading
PN7120 does not respond on the I2C bus
NXP’s PN7120 is NFC controller for contactless communication at 13.56MHz. It interfaces with the host CPU via the I2C bus. The I2C slave address of PN7120 is 0b010100Lx, where L is a configurable LSB of the address (by pin B2,… Continue Reading
The Tale of a GCC Upgrade
Once upon a time, I decided it is a good time to upgrade the version of gcc compiler we use in our ARM926-based firmware project. Historically, this project uses gcc version 4.6, which is quite outdated nowadays (January 2018). In… Continue Reading
Did you know: Unaligned accesses in ARM
The X86 has always supported unaligned accesses. In the ARM world the first architecture that supported unaligned accesses in hardware was ARMv6. The architecture was implemented in the ARM11 core around the year 2002 and onward. There is an excellent… Continue Reading
Connecting MCU and FPGA at 100Mbit/s Using Ethernet RMII [Part 2]
This is Part 2 of a two-part series on Ethernet RMII. In Part 1 I described my hardware setup and basic Ethernet operation. In the second and final part I will describe the design of specialized MAC cores I implemented… Continue Reading
Connecting MCU and FPGA at 100Mbit/s Using Ethernet RMII [Part 1]
This is Part 1 of the two-part series on Ethernet RMII. Part 2 is also available. Imagine your application requires a non-standard periphery controlled by an embedded processor. What options do you have? The periphery can be implemented in an… Continue Reading
How to: Altium Circuit Maker PCB to OSH-Park
How to export PCB design from the free Altium Circuit Maker v1.0.4 so that it can be submitted to OSH Park fab. This took me an evening to figure out; OSH Park service was bitching about missing “outline” and/or drill… Continue Reading
[vid] A little ping-pong after the work
[Pic] BGA Dead-Bug Style
[half-way through; click a pic to see hi-res] [connections to bga] [finished “product”] And it (almost) worked! Though not at-speed, because of wire inductances.