Category Archives: MCU

ARM:0009a – bug in CubeMX makefile

Posted on June 2, 2020 by Administrator

First you generate code, then you regenerate code, do make and… > “make.exe” all make.exe all -C .. make.exe[1]: Entering directory ‘F:/MyDoks/elektronika/ARM/daiktas-cube/SINGLE_UART’ Makefile:118: *** missing separator. Stop. make.exe[1]: Leaving directory ‘F:/MyDoks/elektronika/ARM/daiktas-cube/SINGLE_UART’ make.exe: *** [makefile:3: all] Error 2 > Process Exit … Continue reading →

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ARM:0010 STM32CubeMX- USB 2 COM dongle

Posted on May 29, 2020 by Administrator

This article is also an introduction, but this time a bit more practical- USB to serial port (COM) dongle. This tutorial will show how to create USB devices from “canned” software using only STM32CubeMX. For this example I used some … Continue reading →

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ARM:0009 STM32CubeMX tool from STM MCUs

Posted on May 27, 2020 by Administrator

There will be several posts about using the cheapest MCU board from China. So called Bluepill- PCB containing STM32F103C8T6 microcontroller, USB connector and some small elements. For a few bucks/euros we have upto 72MHz CPU, 64Kb of ROM and up … Continue reading →

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Thing to know: Z80 CPU clock

Posted on April 17, 2020 by Administrator

I just only want to send notes to myself. Z80 CPU clock must be 5Vpp and pure TTL levels sometimes are too low for good and stable CPU work. Even this old CPU is very stable at 5Vpp clock, meanwhile … Continue reading →

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ZX Spectrum inside CPLD

Posted on March 24, 2020 by Administrator

I found an old ZX Spectrum clone made in Soviet Union in the 90’s. It was my computer, I wrote several programs on it and also, I wrote drivers for Epson printer on this hardware. This model has Soviet chip … Continue reading →

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Testing Commodore 6526/8520 copy in CPLD

Posted on March 21, 2020 by Administrator

There are quite expensive obsolete chip from various Commodore computers and peripherals- CIA/PIA MOS 6526 and a bit changed 8520 used in Amiga computers. This is a “complex” peripheral interface adapter chip for 6502 processor or 68K chipset. It is … Continue reading →

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AVR USB printer device and teletype

Posted on July 11, 2019 by Administrator

I have old teletype printer T-63 (it is made by RTF in Eastern Germany, clone of old Siemens Teletype). And the idea is about connecting it as USB printer to our-days computer. Easiest way is to connect it using RS232 … Continue reading →

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Building 8bit ATARI test ROM in easy way

Posted on May 3, 2018 by Administrator

I was experimenting with damaged Atari 800XL and I need to test it in low level. I wrote several lines in machine code and it was pain in the ass to fill data to ROM chip. After entering HEX data … Continue reading →

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ATMEGA USB 13

Posted on December 14, 2007 by Administrator

Maybe I have some superstitious beliefs. So the are no Atmega USB 13 blog entry and no project #13.

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ATMEGA USB 12

Posted on December 7, 2007 by Administrator

Next toys connected to my AVR-USB testing board are two Freescale semiconductors (ex Motorola) accelerometer chips: MMA3202D and MMA7260QT. First is “catastrophic” accelerometer chip with high-G (100g X-axis and 50g Y-axis) sensor. If you apply such acceleration to human body … Continue reading →

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