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Oh dear, stuck in a pattern...
Found myself doing this this morning: switch (op-address) { case HL: mem = ram[HL]; break; case PC: mem = ram[PC]; break; case SP: mem = ram[SP]; break...
Thursday, 10 March 2022 - 10:19
28HC256 - 5v eeprom, programmed from 3.3 system?
Per the title, has anyone actually tried this? That is, taken a 5v eeprom, and programmed it using a 3v3 microcontroller to drive the pins directly? The attached logic can use...
Monday, 21 February 2022 - 15:59
Hot air soldering
I've had a couple of dozen boards to make which include a processor part with 0.5mm pitch pins - LQFP-48 and LQFP-64 and using my old and well practiced 'run solder along all...
Saturday, 12 February 2022 - 07:12
In circuit eeprom programming
Has anyone tried this?   I'd like to leave a capability to program an eeprom in circuit, when its normal operation is as a prom. Its address lines are driven by normal 74HC...
Thursday, 20 January 2022 - 07:50
PAL - a modern equivalent for combinational logic
Having ploughed through the internet and any number of data sheets, I keep bouncing off the 16L8 currently supplied by Rochester Industries. https://www.digikey.co.uk/en/pro......
Tuesday, 23 November 2021 - 09:32
Doh...
I spent some time debugging yesterday... I use an LM358 as a level converter, and was getting no output from it... not a twitch.   So I changed it. Not a twitch. So I changed...
Saturday, 17 July 2021 - 06:02
Problems with LDO regulator AZ1117lH-TRG3.3
I'm having heavy headaches with the LDO regulator of the title... they work when initially tested (either dead bug or on an otherwise empty PCB) but I've had a better than 50%...
Wednesday, 7 July 2021 - 14:22
AP2204K - how hot is too hot?
https://www.mouser.de/datasheet/...   I'm using one of these in the smallest packet (SOT-23-5) and discovered too late that my display is taking rather more current than...
Wednesday, 12 May 2021 - 05:42
Aaargh debugging!
Slowly pulling out my hair here... in general programming because the processor is an ARM STM32L073.   I have a widget which talks on two serial ports; on one to a PC via a...
Sunday, 4 April 2021 - 19:51
How big is ~uint8_t?
SERIAL_RESPONSE tx_bosch (int fd, uint8_t tx_byte, RESPONSE_TYPE response) { uint8_t rx_byte; < stuff that sends tx_byte and receives rx_byte > retval = ((...
Tuesday, 23 February 2021 - 22:20
Efficient storage of and access to variable length collections of strings
I have a lot of strings in multiple languages (as a basic i18n attempt for an embedded project) and I've been playing with ways to access and store them. They are of two types;...
Thursday, 7 January 2021 - 09:03
I know nothing about bluetooth, so... <SOLVED>
This seems like a good place to ask.   What I want to do is drop an inexpensive module onto a design such that when connected to linux, windows, or mobile phone (the last is...
Wednesday, 2 December 2020 - 22:00

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