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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |