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avr-gcc: Have I told you lately that I hate you?
Another day, another avr-gcc bug.  I found this while working on ArduinoShrink, testing with the Arduino IDE 1.8.13/avr-gcc 7.3.0.   The bug is that avr-gcc does not...
Sunday, 11 April 2021 - 11:31
gnu assember style guide?
Although there are lots of C and C++ style guides to choose from, I've not been able to find anything for assembler.  Has anyone come across one?   I've looked at the...
Tuesday, 30 March 2021 - 12:41
avr-gcc inline asm constraint bug
int main() { asm volatile ( "clr r25\n" "ldi r24, %0\n" :: "M" ((unsigned char)137) ); }asm.c:4:5: warning: asm operand 0 probably doesn't match constraints...
Tuesday, 9 March 2021 - 20:11
water heater energy logger
I'd like to record the on/off times of an electric water heater with two heating elements.   A couple weeks of monitoring should be enough.  My first thought is a...
Wednesday, 3 March 2021 - 15:43
HVSP pointless instructions
While analyzing the HVSP for the tx4 and tx5, I noticed some of the commands in the datasheet don't make any sense.  Instruction 3 for reading fuses and lock bits is just...
Wednesday, 10 February 2021 - 04:03
RESET pin not always 12V tolerant?
I've been experimenting with HVSP on some ATtinies again, and this time I wondered what happens if 12V is applied to a running AVR.  It's obviously 12V tolerant for some 10s...
Sunday, 7 February 2021 - 21:30
another bit-banged async serial Tx implementation
Most of my bit-banged serial implementations have used a baud rate fixed at compile time.  I'm working on a project which requires transmitting at a baud rate that will be...
Saturday, 6 February 2021 - 15:25
missing posts about signature page modification
A couple years ago I started work on a program to retune OSCCAL by modifying the signature page.  I had found some old (dating back over a decade) posts discussing the...
Thursday, 4 February 2021 - 20:08
Disovered a new MCU: SH77P1652
The remote control for a Midea heat pump doesn't seem to be working (IR LED doesn't seem to be transmitting), so I took it apart.  On the PCB it's got a couple dozen passives...
Wednesday, 3 February 2021 - 21:55
signal integrity and impedance matching
Over several years of work with 8-bit AVRs, I've never had problems with signal integrity, even when running signals up to 3Mhz over 50cm long ribbon cable.  Over the past...
Wednesday, 27 January 2021 - 01:44
AVR output curves
I'm looking for output rise time curves for 3V3 and 5V supply into a hiZ load with 20-30pF of capacitance.  With my scope it seems to be around 3ns, but at 1Gsps, the sample...
Tuesday, 26 January 2021 - 23:47
how to test for flaky solder connections?
When I hand-assemble boards, I always use lots of flux, and test connections for continuity.  Nevertheless, I still encounter flaky connections, particularly with through-...
Sunday, 17 January 2021 - 15:44

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