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Discussion Title Created date
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
connecting AVR to nrf24l01 wireless modules
I've been trying to come up with a simple and cheap way to connect an AVR to nrf24l01 modules to make coin-cell powered wireless sensor nodes. By cheap I mean...
Tuesday, 18 February 2014 - 05:55
IO register address inconsistencies
I had thought that different AVRs used the same address for the same register. For example SREG always seems to be at 0x3f. I find it convenient since I can build a binary for...
Monday, 17 February 2014 - 04:17
basic instruction set listing?
I'm looking for an AVR instruction set listing with only real instructions listed. The AVR instruction set manual has extra "instructions" that are just aliases for other...
Saturday, 15 February 2014 - 15:48
[HARD] [SOFT] [C] nrf24l01 control with 3 wires on ATtinyx5
Nrf24l01+ modules are a cheap and low-power option for MCU wireless communication. Libraries are available for Arduino, and for arduino compatible MCUs like the ATTiny85....
Thursday, 13 February 2014 - 01:52
help with writing a 64-byte serial bootloader
I'm writing a universal (attiny & atmega) bootloader for AVRs with up to 8K of flash that fits in 32 instructions (64 bytes) + a 2-byte virtual reset vector. The current...
Wednesday, 12 February 2014 - 04:23

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