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Interesting cost of C++
The talk-show hosts usually jump in about seven minutes into the kind of overdetailed problem description I'm about to present and ask, "So what's your question?". Anticpating...
Friday, 6 May 2011 - 23:07
Browbeating GCC into using SBIS/SBIC to test I/O pins
I was looking over a change I'm making to my almost-stable-now bootloader firmware, and was dumbfounded at the lengths the compiler went to in order to squander time and codespace...
Friday, 15 April 2011 - 00:52
What is a "load addres" record?
I'm getting awfully close to being done with a "bootloader application" for my employer, and I'm noticing what appears to be an extra data record in the .hex file that the WinAVR-...
Thursday, 3 March 2011 - 23:20
Software I2C master question
Quite often, there's advice posted here and elsewhere, saying that a Master Receiver MUST negatively acknowledge (NAK) the last byte of all Read operations. Indeed, Phillips' "...
Tuesday, 11 January 2011 - 22:51
Pointless "why didn't they..." question about AVR
Sorry for the rant, but something about the "why did they put the interrupt enable bit in SREG?" question kind of tampered with my inhibitions I guess. My exasperated question is...
Sunday, 19 December 2010 - 03:27
Linker script confusion
Greetings, freaks! The project I'm currently working on includes the development of a bootloader, and it's plunged me into the unfamiliar (and well-nigh unfathomable) swamp of gnu...
Monday, 6 December 2010 - 06:31
Adjusting internal RC oscillator at runtime?
I have an application with some interrupt-servicing timing requirements that can be met at a system clock speed of 8MHz, but without much margin. There's no requirement for any...
Thursday, 4 November 2010 - 00:25
Gcc clumsiness with bitfields: typical or avoidable?
I came across an example of GCC generating awkward code while tinkering with a technique for adding valid/invalid status to a subroutine's return value, and offer it for your...
Thursday, 28 October 2010 - 23:34
AVR TWI slave receiver mode: still inadequate?
I'm partially responsible for maintaining and occasionally extending a family of products that need to function as I2C-controlled peripherals for a larger system. Initially,...
Friday, 6 August 2010 - 19:22
AStudio vs. AT90USB82 spec: is "JMP" a supported i
I've experienced several problems trying to use AStudio's simulator on some class project firmware developed with WinAVR's gcc C compiler and gas assembler, but the most serious...
Monday, 24 May 2010 - 19:02
gas vs. the AVR instruction set
The AVR designers, observing that you don't need to have both "add immediate" AND "subtract immediate" instructions, because you can always just use a negative value with one to...
Sunday, 16 May 2010 - 23:52
Restore USB DFU bootloader?
While troubleshooting some "class project boards" of mine that FLIP couldn't connect to via USB, I used an AVRISP pod to verify their brains' integrity. I wanted to verify that...
Saturday, 24 April 2010 - 00:34

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