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picoboot beta 2
I've just released beta 2 of picoboot. There are no changes to the bootloader code - just to picoboot-avrdude. Instead of erasing as pages were written, it now implements chip...
Tuesday, 18 March 2014 - 04:53
how to synchronize 2 code repositories?
I'm working on a couple of projects that include the code from another project (i.e avrdude, v-usb). I'm trying to figure out how I can keep my copy of the code in sync, but so...
Friday, 14 March 2014 - 14:57
aspspi - USBasp SPI terminal
I made a modified version of avrdude's usbasp module to make an interactive SPI terminal for debugging nrf24l01 modules. It should work for any device using SPI communication...
Thursday, 13 March 2014 - 02:42
empty interrupt
I'm trying to test out sleep mode and using the watchdog timer to wake up. I define WDT_vect as an empty interrupt: EMPTY_INTERRUPT(WDT_vect); Which generates an ISR with a...
Wednesday, 12 March 2014 - 02:20
sleep mode dn_003 out of date?
The design note says: When waking up from Power-save mode or Power-down mode by an external interrupt, a number of instruction cycles are executed before the interrupt flags are...
Tuesday, 11 March 2014 - 02:40
faster & better crc/hash than crc-8?
I'm wondering if anyone has written a fast 8-bit hash function that is as good or better than CRC-8 for short (6-8byte) messages. Here's the crc-8 code I found: byte tempI;...
Monday, 10 March 2014 - 00:56
uncalibrated internal temperature sensor accuracy
Various sources I've read including AVR122 indicate typical uncalibrated accuracy of +-10C. I just tested an ATtiny85, and am getting raw readings of 254 at room temperature (~...
Wednesday, 5 March 2014 - 05:11
decoupling
I usually power my AVR breadboard prototypes from a computer USB port. I know the PC power is quite clean, so I typically don't bother with decoupling capacitors. When testing...
Sunday, 2 March 2014 - 23:56
picoboot beta release
Today I've released the beta-1 version of picoboot. Requiring only 66 bytes of flash, picoboot is the smallest AVR bootloader, taking a quarter of the space of other "tiny"...
Thursday, 27 February 2014 - 03:50
alpha testers wanted for picoboot
picoboot is a bootloader that takes only 66 bytes of flash and works on ATtiny AVRs without hardware bootloader support by using a virtual reset vector. Builds for attiny84/85 and...
Thursday, 20 February 2014 - 01:54
I want to get rid of empty space in a binary
Picoboot takes less than 100 bytes including the sample blink app, yet when I build it I get an 8KB binary with lots of empty space (initialized to zero). Is there a way to avoid...
Thursday, 20 February 2014 - 01:20
rjmp offset calculation in C for bootloader VirtualReset
For picoboot I need to calculate the start of the application code from the address 0 rjmp instruction, and do the calculations to generate an rjmp to the start of the application...
Wednesday, 19 February 2014 - 16:18

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