Post Created date
Need example program implementing sha256 or keccak of the avr-crypto-lib
There is more to password storage than simply hashing the plaintext password and storing the hash. Someone who wants to guess your password can just hash their guesses and check...
Sunday, 23 June 2019 - 03:26
multiple I2C master problem
MrKendo wrote: it seems that multi-master support in the AVR TWI hardware may have a race condition that you would need to work around in software.   Hmmm, this did not make...
Saturday, 22 June 2019 - 21:34
multiple I2C master problem
ka7ehk wrote: You really need some kind of arbitration between the masters.   I2C has arbitration "built-in" to the protocol. No need to do anything yourself except make...
Saturday, 22 June 2019 - 20:23
Can't reset to default settings a light bulb.
As kids we would delicately balance the lever of 3-way light switches in the center.  Then the other switch in the circuit would appear to not function, or you might guess...
Friday, 21 June 2019 - 15:31
Can't reset to default settings a light bulb.
jgmdesign wrote: ... not programmed properly its a nightmare.   Yep.  One can not even read the documentation without becoming a distributer/installer.  Alas.......
Thursday, 20 June 2019 - 23:58
Can't reset to default settings a light bulb.
My house came with a "smart" switch system which requires programming.  The programmers did a terrible job and there is no way to program the things myself.  So I ripped...
Thursday, 20 June 2019 - 22:53
USART not fast enough - F_CPU define problem?
It sounds like you are using the internal 8 MHz clock and have the CKDIV8 fuse programmed (which divides the clock by 8).  You will have to change the fuses to use a 20 MHz...
Wednesday, 19 June 2019 - 20:33
Some one check my thinking! Serial port content
max_torque_2008 wrote: Whats the best way to do a divide by 10 on the clock signal?   Another way is if you have a spare timer and free output compare pin.  Run the...
Wednesday, 19 June 2019 - 13:33
Has anybody used the ADC LSB to generate random bit sequences?
For seeding an LFSR you could sample all of the PIN registers, TCNTs, SPH and SPL, SREG, OSCCAL, (and any others that won't interfere with normal operation), and mix them all...
Wednesday, 19 June 2019 - 00:08
Has anybody used the ADC LSB to generate random bit sequences?
Do you need actual random data, or is random-looking data OK?  If it just needs to appear random, then I'd suggest using a linear-feedback shift register (LFSR).   The...
Tuesday, 18 June 2019 - 20:06
Troubles programming with usbasp and radio chip
No, it needs to be connected:     --Mike  
Friday, 14 June 2019 - 13:34
Troubles programming with usbasp and radio chip
AVcc needs to be connected properly.   --Mike  
Friday, 14 June 2019 - 13:25

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